| 1 |
/* |
| 2 |
* powerrom_cpu.cpp - Using the 680x0 emulator in PowerMac ROMs for Basilisk II |
| 3 |
* |
| 4 |
* Basilisk II (C) 1997-2001 Christian Bauer |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#include <unistd.h> |
| 22 |
#include <signal.h> |
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#include <stdlib.h> |
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|
| 25 |
#include <AppKit.h> |
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#include <KernelKit.h> |
| 27 |
#include <StorageKit.h> |
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|
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#include "sysdeps.h" |
| 30 |
#include "cpu_emulation.h" |
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#include "main.h" |
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#include "emul_op.h" |
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#include "prefs.h" |
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#include "user_strings.h" |
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|
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#include "sheep_driver.h" |
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|
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#define DEBUG 0 |
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#include "debug.h" |
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|
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// Save FP regs in Execute68k()? |
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#define SAVE_FP_EXEC_68K 0 |
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|
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|
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// Constants |
| 46 |
const char ROM_FILE_NAME[] = "PowerROM"; |
| 47 |
const char KERNEL_AREA_NAME[] = "Macintosh Kernel Data"; |
| 48 |
const char DR_CACHE_AREA_NAME[] = "Macintosh DR Cache"; |
| 49 |
|
| 50 |
const uint32 ROM_BASE = 0x40800000; // Base address of ROM |
| 51 |
const uint32 ROM_SIZE = 0x00400000; // Size of ROM file |
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const uint32 ROM_AREA_SIZE = 0x00500000; // Size of ROM area |
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|
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const uint32 DR_CACHE_BASE = 0x69000000; // Address of DR cache |
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const uint32 DR_CACHE_SIZE = 0x80000; // Size of DR Cache |
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|
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const uint32 SIG_STACK_SIZE = 8192; // Size of signal stack |
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|
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// PowerPC opcodes |
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const uint32 POWERPC_NOP = 0x60000000; |
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const uint32 POWERPC_ILLEGAL = 0x00000000; |
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const uint32 POWERPC_BLR = 0x4e800020; |
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const uint32 POWERPC_BCTR = 0x4e800420; |
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|
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// Extra Low Memory Globals |
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#define MODE_68K 0 // 68k emulator active |
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#define MODE_EMUL_OP 1 // Within EMUL_OP routine |
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|
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#define XLM_RESET_STACK 0x2800 // Reset stack pointer |
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#define XLM_KERNEL_DATA 0x2804 // Pointer to Kernel Data |
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#define XLM_TOC 0x2808 // TOC pointer of emulator |
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#define XLM_RUN_MODE 0x2810 // Current run mode, see enum above |
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#define XLM_68K_R25 0x2814 // Contents of the 68k emulator's r25 (which contains the interrupt level), saved upon entering EMUL_OP mode, used by Execute68k() and the USR1 signal handler |
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#define XLM_IRQ_NEST 0x2818 // Interrupt disable nesting counter (>0: disabled) |
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#define XLM_PVR 0x281c // Theoretical PVR |
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#define XLM_EMUL_RETURN_PROC 0x2824 // Pointer to EMUL_RETURN routine |
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#define XLM_EXEC_RETURN_PROC 0x2828 // Pointer to EXEC_RETURN routine |
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#define XLM_EMUL_OP_PROC 0x282c // Pointer to EMUL_OP routine |
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#define XLM_EMUL_RETURN_STACK 0x2830 // Stack pointer for EMUL_RETURN |
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|
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|
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// RAM and ROM pointers |
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uint32 RAMBaseMac; // RAM base (Mac address space) |
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uint8 *RAMBaseHost; // RAM base (host address space) |
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uint32 RAMSize; // Size of RAM |
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uint32 ROMBaseMac; // ROM base (Mac address space) |
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uint8 *ROMBaseHost; // ROM base (host address space) |
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uint32 ROMSize; // Size of ROM |
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|
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|
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// Emulator Data |
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struct EmulatorData { |
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uint32 v[0x400]; |
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}; |
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|
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|
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// Kernel Data |
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struct KernelData { |
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uint32 v[0x400]; |
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EmulatorData ed; |
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}; |
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|
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|
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// Exceptions |
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class file_open_error {}; |
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class file_read_error {}; |
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class rom_size_error {}; |
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|
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|
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// Global variables |
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static void *TOC; // TOC pointer |
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static uint32 PVR; // Theoretical PVR |
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static int64 CPUClockSpeed; // Processor clock speed (Hz) |
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static int64 BusClockSpeed; // Bus clock speed (Hz) |
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static system_info SysInfo; // System information |
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|
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static area_id kernel_area = -1; // Kernel Data area ID |
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static KernelData *kernel_data = NULL; // Pointer to Kernel Data |
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static uint32 KernelDataAddr; // Address of Kernel Data |
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static EmulatorData *emulator_data = NULL; |
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static area_id dr_cache_area; // DR Cache area ID |
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static uint32 DRCacheAddr; // Address of DR Cache |
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|
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static struct sigaction sigusr1_action; // Interrupt signal (of emulator thread) |
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static bool ReadyForSignals = false; // Flag: emul_thread ready to receive signals |
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|
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|
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// Prototypes |
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static void sigusr1_handler(int sig, void *arg, vregs *r); |
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|
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// From main_beos.cpp |
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extern int sheep_fd; // fd of sheep driver |
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extern thread_id emul_thread; // Emulator thread |
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|
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|
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/* |
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* Load ROM file (upper 3MB) |
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* |
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* file_open_error: Cannot open ROM file (nor use built-in ROM) |
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* file_read_error: Cannot read ROM file |
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*/ |
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|
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// Decode LZSS data |
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static void decode_lzss(const uint8 *src, uint8 *dest, int size) |
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{ |
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char dict[0x1000]; |
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int run_mask = 0, dict_idx = 0xfee; |
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for (;;) { |
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if (run_mask < 0x100) { |
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// Start new run |
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if (--size < 0) |
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break; |
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run_mask = *src++ | 0xff00; |
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} |
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bool bit = run_mask & 1; |
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run_mask >>= 1; |
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if (bit) { |
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// Verbatim copy |
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if (--size < 0) |
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break; |
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int c = *src++; |
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dict[dict_idx++] = c; |
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*dest++ = c; |
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dict_idx &= 0xfff; |
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} else { |
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// Copy from dictionary |
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if (--size < 0) |
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break; |
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int idx = *src++; |
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if (--size < 0) |
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break; |
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int cnt = *src++; |
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idx |= (cnt << 4) & 0xf00; |
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cnt = (cnt & 0x0f) + 3; |
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while (cnt--) { |
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char c = dict[idx++]; |
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dict[dict_idx++] = c; |
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*dest++ = c; |
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idx &= 0xfff; |
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dict_idx &= 0xfff; |
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} |
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} |
| 183 |
} |
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} |
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|
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static void load_rom(void) |
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{ |
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// Get rom file path from preferences |
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const char *rom_path = PrefsFindString("powerrom"); |
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|
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// Try to open ROM file |
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BFile file(rom_path ? rom_path : ROM_FILE_NAME, B_READ_ONLY); |
| 193 |
if (file.InitCheck() != B_NO_ERROR) { |
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|
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// Failed, then ask sheep driver for ROM |
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uint8 *rom = new uint8[ROM_SIZE]; // Reading directly into the area doesn't work |
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ssize_t actual = read(sheep_fd, (void *)rom, ROM_SIZE); |
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if (actual == ROM_SIZE) { |
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// Copy upper 3MB |
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memcpy((void *)(ROM_BASE + 0x100000), rom + 0x100000, ROM_SIZE - 0x100000); |
| 201 |
delete[] rom; |
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return; |
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} else |
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throw file_open_error(); |
| 205 |
} |
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|
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printf(GetString(STR_READING_ROM_FILE)); |
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|
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// Get file size |
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off_t rom_size = 0; |
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file.GetSize(&rom_size); |
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|
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uint8 *rom = new uint8[ROM_SIZE]; // Reading directly into the area doesn't work |
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ssize_t actual = file.Read((void *)rom, ROM_SIZE); |
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if (actual == ROM_SIZE) { |
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// Plain ROM image, copy upper 3MB |
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memcpy((void *)(ROM_BASE + 0x100000), rom + 0x100000, ROM_SIZE - 0x100000); |
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delete[] rom; |
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} else { |
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if (strncmp((char *)rom, "<CHRP-BOOT>", 11) == 0) { |
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// CHRP compressed ROM image |
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D(bug("CHRP ROM image\n")); |
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uint32 lzss_offset, lzss_size; |
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|
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char *s = strstr((char *)rom, "constant lzss-offset"); |
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if (s == NULL) |
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throw rom_size_error(); |
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s -= 7; |
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if (sscanf(s, "%06lx", &lzss_offset) != 1) |
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throw rom_size_error(); |
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s = strstr((char *)rom, "constant lzss-size"); |
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if (s == NULL) |
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throw rom_size_error(); |
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s -= 7; |
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if (sscanf(s, "%06lx", &lzss_size) != 1) |
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throw rom_size_error(); |
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D(bug("Offset of compressed data: %08lx\n", lzss_offset)); |
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D(bug("Size of compressed data: %08lx\n", lzss_size)); |
| 239 |
|
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D(bug("Uncompressing ROM...\n")); |
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uint8 *decoded = new uint8[ROM_SIZE]; |
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decode_lzss(rom + lzss_offset, decoded, lzss_size); |
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memcpy((void *)(ROM_BASE + 0x100000), decoded + 0x100000, ROM_SIZE - 0x100000); |
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delete[] decoded; |
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delete[] rom; |
| 246 |
} else if (rom_size != 4*1024*1024) |
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throw rom_size_error(); |
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else |
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throw file_read_error(); |
| 250 |
} |
| 251 |
} |
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|
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|
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/* |
| 255 |
* Patch PowerMac ROM |
| 256 |
*/ |
| 257 |
|
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// ROM type |
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enum { |
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ROMTYPE_TNT, |
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ROMTYPE_ALCHEMY, |
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ROMTYPE_ZANZIBAR, |
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ROMTYPE_GAZELLE, |
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ROMTYPE_NEWWORLD |
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}; |
| 266 |
static int ROMType; |
| 267 |
|
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// Nanokernel boot routine patches |
| 269 |
static bool patch_nanokernel_boot(void) |
| 270 |
{ |
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uint32 *lp; |
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int i; |
| 273 |
|
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// Patch ConfigInfo |
| 275 |
lp = (uint32 *)(ROM_BASE + 0x30d000); |
| 276 |
lp[0x9c >> 2] = KernelDataAddr; // LA_InfoRecord |
| 277 |
lp[0xa0 >> 2] = KernelDataAddr; // LA_KernelData |
| 278 |
lp[0xa4 >> 2] = KernelDataAddr + 0x1000;// LA_EmulatorData |
| 279 |
lp[0xa8 >> 2] = ROM_BASE + 0x480000; // LA_DispatchTable |
| 280 |
lp[0xac >> 2] = ROM_BASE + 0x460000; // LA_EmulatorCode |
| 281 |
lp[0x360 >> 2] = 0; // Physical RAM base (? on NewWorld ROM, this contains -1) |
| 282 |
lp[0xfd8 >> 2] = ROM_BASE + 0x2a; // 68k reset vector |
| 283 |
|
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// Skip SR/BAT/SDR init |
| 285 |
if (ROMType == ROMTYPE_GAZELLE || ROMType == ROMTYPE_NEWWORLD) { |
| 286 |
lp = (uint32 *)(ROM_BASE + 0x310000); |
| 287 |
*lp++ = POWERPC_NOP; |
| 288 |
*lp = 0x38000000; |
| 289 |
} |
| 290 |
static const uint32 sr_init_loc[] = {0x3101b0, 0x3101b0, 0x3101b0, 0x3101ec, 0x310200}; |
| 291 |
lp = (uint32 *)(ROM_BASE + 0x310008); |
| 292 |
*lp = 0x48000000 | (sr_init_loc[ROMType] - 8) & 0xffff; // b ROM_BASE+0x3101b0 |
| 293 |
lp = (uint32 *)(ROM_BASE + sr_init_loc[ROMType]); |
| 294 |
*lp++ = 0x80200000 + XLM_KERNEL_DATA; // lwz r1,(pointer to Kernel Data) |
| 295 |
*lp++ = 0x3da0dead; // lis r13,0xdead (start of kernel memory) |
| 296 |
*lp++ = 0x3dc00010; // lis r14,0x0010 (size of page table) |
| 297 |
*lp = 0x3de00010; // lis r15,0x0010 (size of kernel memory) |
| 298 |
|
| 299 |
// Don't read PVR |
| 300 |
static const uint32 pvr_loc[] = {0x3103b0, 0x3103b4, 0x3103b4, 0x310400, 0x310438}; |
| 301 |
lp = (uint32 *)(ROM_BASE + pvr_loc[ROMType]); |
| 302 |
*lp = 0x81800000 + XLM_PVR; // lwz r12,(theoretical PVR) |
| 303 |
|
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// Set CPU specific data (even if ROM doesn't have support for that CPU) |
| 305 |
lp = (uint32 *)(ROM_BASE + pvr_loc[ROMType]); |
| 306 |
if (ntohl(lp[6]) != 0x2c0c0001) |
| 307 |
return false; |
| 308 |
uint32 ofs = lp[7] & 0xffff; |
| 309 |
lp[8] = (lp[8] & 0xffff) | 0x48000000; // beq -> b |
| 310 |
uint32 loc = (lp[8] & 0xffff) + (uint32)(lp+8) - ROM_BASE; |
| 311 |
lp = (uint32 *)(ROM_BASE + ofs + 0x310000); |
| 312 |
switch (PVR >> 16) { |
| 313 |
case 1: // 601 |
| 314 |
lp[0] = 0x1000; // Page size |
| 315 |
lp[1] = 0x8000; // Data cache size |
| 316 |
lp[2] = 0x8000; // Inst cache size |
| 317 |
lp[3] = 0x00200020; // Coherency block size/Reservation granule size |
| 318 |
lp[4] = 0x00010040; // Unified caches/Inst cache line size |
| 319 |
lp[5] = 0x00400020; // Data cache line size/Data cache block size touch |
| 320 |
lp[6] = 0x00200020; // Inst cache block size/Data cache block size |
| 321 |
lp[7] = 0x00080008; // Inst cache assoc/Data cache assoc |
| 322 |
lp[8] = 0x01000002; // TLB total size/TLB assoc |
| 323 |
break; |
| 324 |
case 3: // 603 |
| 325 |
lp[0] = 0x1000; // Page size |
| 326 |
lp[1] = 0x2000; // Data cache size |
| 327 |
lp[2] = 0x2000; // Inst cache size |
| 328 |
lp[3] = 0x00200020; // Coherency block size/Reservation granule size |
| 329 |
lp[4] = 0x00000020; // Unified caches/Inst cache line size |
| 330 |
lp[5] = 0x00200020; // Data cache line size/Data cache block size touch |
| 331 |
lp[6] = 0x00200020; // Inst cache block size/Data cache block size |
| 332 |
lp[7] = 0x00020002; // Inst cache assoc/Data cache assoc |
| 333 |
lp[8] = 0x00400002; // TLB total size/TLB assoc |
| 334 |
break; |
| 335 |
case 4: // 604 |
| 336 |
lp[0] = 0x1000; // Page size |
| 337 |
lp[1] = 0x4000; // Data cache size |
| 338 |
lp[2] = 0x4000; // Inst cache size |
| 339 |
lp[3] = 0x00200020; // Coherency block size/Reservation granule size |
| 340 |
lp[4] = 0x00000020; // Unified caches/Inst cache line size |
| 341 |
lp[5] = 0x00200020; // Data cache line size/Data cache block size touch |
| 342 |
lp[6] = 0x00200020; // Inst cache block size/Data cache block size |
| 343 |
lp[7] = 0x00040004; // Inst cache assoc/Data cache assoc |
| 344 |
lp[8] = 0x00800002; // TLB total size/TLB assoc |
| 345 |
break; |
| 346 |
// case 5: // 740? |
| 347 |
case 6: // 603e |
| 348 |
case 7: // 603ev |
| 349 |
lp[0] = 0x1000; // Page size |
| 350 |
lp[1] = 0x4000; // Data cache size |
| 351 |
lp[2] = 0x4000; // Inst cache size |
| 352 |
lp[3] = 0x00200020; // Coherency block size/Reservation granule size |
| 353 |
lp[4] = 0x00000020; // Unified caches/Inst cache line size |
| 354 |
lp[5] = 0x00200020; // Data cache line size/Data cache block size touch |
| 355 |
lp[6] = 0x00200020; // Inst cache block size/Data cache block size |
| 356 |
lp[7] = 0x00040004; // Inst cache assoc/Data cache assoc |
| 357 |
lp[8] = 0x00400002; // TLB total size/TLB assoc |
| 358 |
break; |
| 359 |
case 8: // 750 |
| 360 |
lp[0] = 0x1000; // Page size |
| 361 |
lp[1] = 0x8000; // Data cache size |
| 362 |
lp[2] = 0x8000; // Inst cache size |
| 363 |
lp[3] = 0x00200020; // Coherency block size/Reservation granule size |
| 364 |
lp[4] = 0x00000020; // Unified caches/Inst cache line size |
| 365 |
lp[5] = 0x00200020; // Data cache line size/Data cache block size touch |
| 366 |
lp[6] = 0x00200020; // Inst cache block size/Data cache block size |
| 367 |
lp[7] = 0x00080008; // Inst cache assoc/Data cache assoc |
| 368 |
lp[8] = 0x00800002; // TLB total size/TLB assoc |
| 369 |
break; |
| 370 |
case 9: // 604e |
| 371 |
case 10: // 604ev5 |
| 372 |
lp[0] = 0x1000; // Page size |
| 373 |
lp[1] = 0x8000; // Data cache size |
| 374 |
lp[2] = 0x8000; // Inst cache size |
| 375 |
lp[3] = 0x00200020; // Coherency block size/Reservation granule size |
| 376 |
lp[4] = 0x00000020; // Unified caches/Inst cache line size |
| 377 |
lp[5] = 0x00200020; // Data cache line size/Data cache block size touch |
| 378 |
lp[6] = 0x00200020; // Inst cache block size/Data cache block size |
| 379 |
lp[7] = 0x00040004; // Inst cache assoc/Data cache assoc |
| 380 |
lp[8] = 0x00800002; // TLB total size/TLB assoc |
| 381 |
break; |
| 382 |
// case 11: // X704? |
| 383 |
case 12: // ??? |
| 384 |
lp[0] = 0x1000; // Page size |
| 385 |
lp[1] = 0x8000; // Data cache size |
| 386 |
lp[2] = 0x8000; // Inst cache size |
| 387 |
lp[3] = 0x00200020; // Coherency block size/Reservation granule size |
| 388 |
lp[4] = 0x00000020; // Unified caches/Inst cache line size |
| 389 |
lp[5] = 0x00200020; // Data cache line size/Data cache block size touch |
| 390 |
lp[6] = 0x00200020; // Inst cache block size/Data cache block size |
| 391 |
lp[7] = 0x00080008; // Inst cache assoc/Data cache assoc |
| 392 |
lp[8] = 0x00800002; // TLB total size/TLB assoc |
| 393 |
break; |
| 394 |
case 13: // ??? |
| 395 |
lp[0] = 0x1000; // Page size |
| 396 |
lp[1] = 0x8000; // Data cache size |
| 397 |
lp[2] = 0x8000; // Inst cache size |
| 398 |
lp[3] = 0x00200020; // Coherency block size/Reservation granule size |
| 399 |
lp[4] = 0x00000020; // Unified caches/Inst cache line size |
| 400 |
lp[5] = 0x00200020; // Data cache line size/Data cache block size touch |
| 401 |
lp[6] = 0x00200020; // Inst cache block size/Data cache block size |
| 402 |
lp[7] = 0x00080008; // Inst cache assoc/Data cache assoc |
| 403 |
lp[8] = 0x01000004; // TLB total size/TLB assoc |
| 404 |
break; |
| 405 |
// case 50: // 821 |
| 406 |
// case 80: // 860 |
| 407 |
case 96: // ??? |
| 408 |
lp[0] = 0x1000; // Page size |
| 409 |
lp[1] = 0x8000; // Data cache size |
| 410 |
lp[2] = 0x8000; // Inst cache size |
| 411 |
lp[3] = 0x00200020; // Coherency block size/Reservation granule size |
| 412 |
lp[4] = 0x00010020; // Unified caches/Inst cache line size |
| 413 |
lp[5] = 0x00200020; // Data cache line size/Data cache block size touch |
| 414 |
lp[6] = 0x00200020; // Inst cache block size/Data cache block size |
| 415 |
lp[7] = 0x00080008; // Inst cache assoc/Data cache assoc |
| 416 |
lp[8] = 0x00800004; // TLB total size/TLB assoc |
| 417 |
break; |
| 418 |
default: |
| 419 |
printf("WARNING: Unknown CPU type\n"); |
| 420 |
break; |
| 421 |
} |
| 422 |
|
| 423 |
// Don't set SPRG3, don't test MQ |
| 424 |
lp = (uint32 *)(ROM_BASE + loc + 0x20); |
| 425 |
*lp++ = POWERPC_NOP; |
| 426 |
lp++; |
| 427 |
*lp++ = POWERPC_NOP; |
| 428 |
lp++; |
| 429 |
*lp = POWERPC_NOP; |
| 430 |
|
| 431 |
// Don't read MSR |
| 432 |
lp = (uint32 *)(ROM_BASE + loc + 0x40); |
| 433 |
*lp = 0x39c00000; // li r14,0 |
| 434 |
|
| 435 |
// Don't write to DEC |
| 436 |
lp = (uint32 *)(ROM_BASE + loc + 0x70); |
| 437 |
*lp++ = POWERPC_NOP; |
| 438 |
loc = (lp[0] & 0xffff) + (uint32)lp - ROM_BASE; |
| 439 |
|
| 440 |
// Don't set SPRG3 |
| 441 |
lp = (uint32 *)(ROM_BASE + loc + 0x2c); |
| 442 |
*lp = POWERPC_NOP; |
| 443 |
|
| 444 |
// Don't read PVR |
| 445 |
static const uint32 pvr_ofs[] = {0x138, 0x138, 0x138, 0x140, 0x148}; |
| 446 |
lp = (uint32 *)(ROM_BASE + loc + pvr_ofs[ROMType]); |
| 447 |
*lp = 0x82e00000 + XLM_PVR; // lwz r23,(theoretical PVR) |
| 448 |
lp = (uint32 *)(ROM_BASE + loc + 0x170); |
| 449 |
if (*lp == 0x7eff42a6) // NewWorld ROM |
| 450 |
*lp = 0x82e00000 + XLM_PVR; // lwz r23,(theoretical PVR) |
| 451 |
lp = (uint32 *)(ROM_BASE + 0x313134); |
| 452 |
if (*lp == 0x7e5f42a6) |
| 453 |
*lp = 0x82400000 + XLM_PVR; // lwz r18,(theoretical PVR) |
| 454 |
lp = (uint32 *)(ROM_BASE + 0x3131f4); |
| 455 |
if (*lp == 0x7e5f42a6) // NewWorld ROM |
| 456 |
*lp = 0x82400000 + XLM_PVR; // lwz r18,(theoretical PVR) |
| 457 |
|
| 458 |
// Don't read SDR1 |
| 459 |
static const uint32 sdr1_ofs[] = {0x174, 0x174, 0x174, 0x17c, 0x19c}; |
| 460 |
lp = (uint32 *)(ROM_BASE + loc + sdr1_ofs[ROMType]); |
| 461 |
*lp++ = 0x3d00dead; // lis r8,0xdead (pointer to page table) |
| 462 |
*lp++ = 0x3ec0001f; // lis r22,0x001f (size of page table) |
| 463 |
*lp = POWERPC_NOP; |
| 464 |
|
| 465 |
// Don't clear page table |
| 466 |
static const uint32 pgtb_ofs[] = {0x198, 0x198, 0x198, 0x1a0, 0x1c4}; |
| 467 |
lp = (uint32 *)(ROM_BASE + loc + pgtb_ofs[ROMType]); |
| 468 |
*lp = POWERPC_NOP; |
| 469 |
|
| 470 |
// Don't invalidate TLB |
| 471 |
static const uint32 tlb_ofs[] = {0x1a0, 0x1a0, 0x1a0, 0x1a8, 0x1cc}; |
| 472 |
lp = (uint32 *)(ROM_BASE + loc + tlb_ofs[ROMType]); |
| 473 |
*lp = POWERPC_NOP; |
| 474 |
|
| 475 |
// Don't create RAM descriptor table |
| 476 |
static const uint32 desc_ofs[] = {0x350, 0x350, 0x350, 0x358, 0x37c}; |
| 477 |
lp = (uint32 *)(ROM_BASE + loc + desc_ofs[ROMType]); |
| 478 |
*lp = POWERPC_NOP; |
| 479 |
|
| 480 |
// Don't load SRs and BATs |
| 481 |
static const uint32 sr_ofs[] = {0x3d8, 0x3d8, 0x3d8, 0x3e0, 0x404}; |
| 482 |
lp = (uint32 *)(ROM_BASE + loc + sr_ofs[ROMType]); |
| 483 |
*lp = POWERPC_NOP; |
| 484 |
|
| 485 |
// Don't mess with SRs |
| 486 |
static const uint32 sr2_ofs[] = {0x312118, 0x312118, 0x312118, 0x312118, 0x3121b4}; |
| 487 |
lp = (uint32 *)(ROM_BASE + sr2_ofs[ROMType]); |
| 488 |
*lp = POWERPC_BLR; |
| 489 |
|
| 490 |
// Don't check performance monitor |
| 491 |
static const uint32 pm_ofs[] = {0x313148, 0x313148, 0x313148, 0x313148, 0x313218}; |
| 492 |
lp = (uint32 *)(ROM_BASE + pm_ofs[ROMType]); |
| 493 |
while (*lp != 0x7e58eba6) lp++; |
| 494 |
*lp++ = POWERPC_NOP; |
| 495 |
while (*lp != 0x7e78eaa6) lp++; |
| 496 |
*lp++ = POWERPC_NOP; |
| 497 |
while (*lp != 0x7e59eba6) lp++; |
| 498 |
*lp++ = POWERPC_NOP; |
| 499 |
while (*lp != 0x7e79eaa6) lp++; |
| 500 |
*lp++ = POWERPC_NOP; |
| 501 |
while (*lp != 0x7e5aeba6) lp++; |
| 502 |
*lp++ = POWERPC_NOP; |
| 503 |
while (*lp != 0x7e7aeaa6) lp++; |
| 504 |
*lp++ = POWERPC_NOP; |
| 505 |
while (*lp != 0x7e5beba6) lp++; |
| 506 |
*lp++ = POWERPC_NOP; |
| 507 |
while (*lp != 0x7e7beaa6) lp++; |
| 508 |
*lp++ = POWERPC_NOP; |
| 509 |
while (*lp != 0x7e5feba6) lp++; |
| 510 |
*lp++ = POWERPC_NOP; |
| 511 |
while (*lp != 0x7e7feaa6) lp++; |
| 512 |
*lp++ = POWERPC_NOP; |
| 513 |
while (*lp != 0x7e5ceba6) lp++; |
| 514 |
*lp++ = POWERPC_NOP; |
| 515 |
while (*lp != 0x7e7ceaa6) lp++; |
| 516 |
*lp++ = POWERPC_NOP; |
| 517 |
while (*lp != 0x7e5deba6) lp++; |
| 518 |
*lp++ = POWERPC_NOP; |
| 519 |
while (*lp != 0x7e7deaa6) lp++; |
| 520 |
*lp++ = POWERPC_NOP; |
| 521 |
while (*lp != 0x7e5eeba6) lp++; |
| 522 |
*lp++ = POWERPC_NOP; |
| 523 |
while (*lp != 0x7e7eeaa6) lp++; |
| 524 |
*lp++ = POWERPC_NOP; |
| 525 |
|
| 526 |
// Jump to 68k emulator |
| 527 |
static const uint32 jump68k_ofs[] = {0x40c, 0x40c, 0x40c, 0x414, 0x438}; |
| 528 |
lp = (uint32 *)(ROM_BASE + loc + jump68k_ofs[ROMType]); |
| 529 |
*lp++ = 0x80610634; // lwz r3,0x0634(r1) (pointer to Emulator Data) |
| 530 |
*lp++ = 0x8081119c; // lwz r4,0x119c(r1) (pointer to opcode table) |
| 531 |
*lp++ = 0x80011184; // lwz r0,0x1184(r1) (pointer to emulator entry) |
| 532 |
*lp++ = 0x7c0903a6; // mtctr r0 |
| 533 |
*lp = POWERPC_BCTR; |
| 534 |
return true; |
| 535 |
} |
| 536 |
|
| 537 |
// 68k emulator patches |
| 538 |
static bool patch_68k_emul(void) |
| 539 |
{ |
| 540 |
uint32 *lp; |
| 541 |
uint32 base; |
| 542 |
|
| 543 |
// Overwrite twi instructions |
| 544 |
static const uint32 twi_loc[] = {0x36e680, 0x36e6c0, 0x36e6c0, 0x36e6c0, 0x36e740}; |
| 545 |
base = twi_loc[ROMType]; |
| 546 |
lp = (uint32 *)(ROM_BASE + base); |
| 547 |
*lp++ = 0x48000000 + 0x36f900 - base; // b 0x36f900 (Emulator start) |
| 548 |
*lp++ = POWERPC_ILLEGAL; |
| 549 |
*lp++ = 0x48000000 + 0x36fb00 - base - 8; // b 0x36fb00 (Reset opcode) |
| 550 |
*lp++ = POWERPC_ILLEGAL; |
| 551 |
*lp++ = POWERPC_ILLEGAL; |
| 552 |
*lp++ = POWERPC_ILLEGAL; |
| 553 |
*lp++ = POWERPC_ILLEGAL; |
| 554 |
*lp++ = POWERPC_ILLEGAL; |
| 555 |
*lp++ = POWERPC_ILLEGAL; |
| 556 |
*lp++ = POWERPC_ILLEGAL; |
| 557 |
*lp++ = POWERPC_ILLEGAL; |
| 558 |
*lp++ = POWERPC_ILLEGAL; |
| 559 |
*lp++ = POWERPC_ILLEGAL; |
| 560 |
*lp++ = POWERPC_ILLEGAL; |
| 561 |
*lp++ = POWERPC_ILLEGAL; |
| 562 |
*lp++ = POWERPC_ILLEGAL; |
| 563 |
|
| 564 |
// Set reset stack pointer |
| 565 |
lp = (uint32 *)(ROM_BASE + base + 0xf0); |
| 566 |
*lp++ = 0x80200000 + XLM_RESET_STACK; // lwz r1,XLM_RESET_STACK |
| 567 |
|
| 568 |
// Install EXEC_RETURN and EMUL_OP opcodes |
| 569 |
lp = (uint32 *)(ROM_BASE + 0x380000 + (M68K_EXEC_RETURN << 3)); |
| 570 |
*lp++ = 0x80000000 + XLM_EXEC_RETURN_PROC; // lwz r0,XLM_EXEC_RETURN_PROC |
| 571 |
*lp++ = 0x4bfb6ffc; // b 0x36f800 |
| 572 |
for (int i=0; i<M68K_EMUL_OP_MAX-M68K_EMUL_BREAK; i++) { |
| 573 |
*lp++ = 0x38a00000 + i + M68K_EMUL_BREAK; // li r5,M68K_EMUL_OP_* |
| 574 |
*lp++ = 0x4bfb6ffc - i*8; // b 0x36f808 |
| 575 |
} |
| 576 |
|
| 577 |
// Special handling for M68K_EMUL_OP_SHUTDOWN because Basilisk II is running |
| 578 |
// on the 68k stack and simply quitting would delete the RAM area leaving |
| 579 |
// the stack pointer in unaccessible memory |
| 580 |
lp = (uint32 *)(ROM_BASE + 0x380000 + (M68K_EMUL_OP_SHUTDOWN << 3)); |
| 581 |
*lp++ = 0x80000000 + XLM_EMUL_RETURN_PROC; // lwz r0,XLM_EMUL_RETURN_PROC |
| 582 |
*lp++ = 0x4bfb6ffc - (M68K_EMUL_OP_SHUTDOWN - M68K_EXEC_RETURN) * 8; // b 0x36f800 |
| 583 |
|
| 584 |
// Extra routines for EMUL_RETURN/EXEC_RETURN/EMUL_OP |
| 585 |
lp = (uint32 *)(ROM_BASE + 0x36f800); |
| 586 |
*lp++ = 0x7c0803a6; // mtlr r0 |
| 587 |
*lp++ = 0x4e800020; // blr |
| 588 |
|
| 589 |
*lp++ = 0x80000000 + XLM_EMUL_OP_PROC; // lwz r0,XLM_EMUL_OP_PROC |
| 590 |
*lp++ = 0x7c0803a6; // mtlr r0 |
| 591 |
*lp++ = 0x4e800020; // blr |
| 592 |
|
| 593 |
// Extra routine for 68k emulator start |
| 594 |
lp = (uint32 *)(ROM_BASE + 0x36f900); |
| 595 |
*lp++ = 0x7c2903a6; // mtctr r1 |
| 596 |
*lp++ = 0x80200000 + XLM_IRQ_NEST; // lwz r1,XLM_IRQ_NEST |
| 597 |
*lp++ = 0x38210001; // addi r1,r1,1 |
| 598 |
*lp++ = 0x90200000 + XLM_IRQ_NEST; // stw r1,XLM_IRQ_NEST |
| 599 |
*lp++ = 0x80200000 + XLM_KERNEL_DATA;// lwz r1,XLM_KERNEL_DATA |
| 600 |
*lp++ = 0x90c10018; // stw r6,0x18(r1) |
| 601 |
*lp++ = 0x7cc902a6; // mfctr r6 |
| 602 |
*lp++ = 0x90c10004; // stw r6,$0004(r1) |
| 603 |
*lp++ = 0x80c1065c; // lwz r6,$065c(r1) |
| 604 |
*lp++ = 0x90e6013c; // stw r7,$013c(r6) |
| 605 |
*lp++ = 0x91060144; // stw r8,$0144(r6) |
| 606 |
*lp++ = 0x9126014c; // stw r9,$014c(r6) |
| 607 |
*lp++ = 0x91460154; // stw r10,$0154(r6) |
| 608 |
*lp++ = 0x9166015c; // stw r11,$015c(r6) |
| 609 |
*lp++ = 0x91860164; // stw r12,$0164(r6) |
| 610 |
*lp++ = 0x91a6016c; // stw r13,$016c(r6) |
| 611 |
*lp++ = 0x7da00026; // mfcr r13 |
| 612 |
*lp++ = 0x80e10660; // lwz r7,$0660(r1) |
| 613 |
*lp++ = 0x7d8802a6; // mflr r12 |
| 614 |
*lp++ = 0x50e74001; // rlwimi. r7,r7,8,$80000000 |
| 615 |
*lp++ = 0x814105f0; // lwz r10,0x05f0(r1) |
| 616 |
*lp++ = 0x7d4803a6; // mtlr r10 |
| 617 |
*lp++ = 0x7d8a6378; // mr r10,r12 |
| 618 |
*lp++ = 0x3d600002; // lis r11,0x0002 |
| 619 |
*lp++ = 0x616bf072; // ori r11,r11,0xf072 (MSR) |
| 620 |
*lp++ = 0x50e7deb4; // rlwimi r7,r7,27,$00000020 |
| 621 |
*lp++ = 0x4e800020; // blr |
| 622 |
|
| 623 |
// Extra routine for Reset opcode |
| 624 |
lp = (uint32 *)(ROM_BASE + 0x36fc00); |
| 625 |
*lp++ = 0x7c2903a6; // mtctr r1 |
| 626 |
*lp++ = 0x80200000 + XLM_IRQ_NEST; // lwz r1,XLM_IRQ_NEST |
| 627 |
*lp++ = 0x38210001; // addi r1,r1,1 |
| 628 |
*lp++ = 0x90200000 + XLM_IRQ_NEST; // stw r1,XLM_IRQ_NEST |
| 629 |
*lp++ = 0x80200000 + XLM_KERNEL_DATA;// lwz r1,XLM_KERNEL_DATA |
| 630 |
*lp++ = 0x90c10018; // stw r6,0x18(r1) |
| 631 |
*lp++ = 0x7cc902a6; // mfctr r6 |
| 632 |
*lp++ = 0x90c10004; // stw r6,$0004(r1) |
| 633 |
*lp++ = 0x80c1065c; // lwz r6,$065c(r1) |
| 634 |
*lp++ = 0x90e6013c; // stw r7,$013c(r6) |
| 635 |
*lp++ = 0x91060144; // stw r8,$0144(r6) |
| 636 |
*lp++ = 0x9126014c; // stw r9,$014c(r6) |
| 637 |
*lp++ = 0x91460154; // stw r10,$0154(r6) |
| 638 |
*lp++ = 0x9166015c; // stw r11,$015c(r6) |
| 639 |
*lp++ = 0x91860164; // stw r12,$0164(r6) |
| 640 |
*lp++ = 0x91a6016c; // stw r13,$016c(r6) |
| 641 |
*lp++ = 0x7da00026; // mfcr r13 |
| 642 |
*lp++ = 0x80e10660; // lwz r7,$0660(r1) |
| 643 |
*lp++ = 0x7d8802a6; // mflr r12 |
| 644 |
*lp++ = 0x50e74001; // rlwimi. r7,r7,8,$80000000 |
| 645 |
*lp++ = 0x814105f4; // lwz r10,0x05f8(r1) |
| 646 |
*lp++ = 0x7d4803a6; // mtlr r10 |
| 647 |
*lp++ = 0x7d8a6378; // mr r10,r12 |
| 648 |
*lp++ = 0x3d600002; // lis r11,0x0002 |
| 649 |
*lp++ = 0x616bf072; // ori r11,r11,0xf072 (MSR) |
| 650 |
*lp++ = 0x50e7deb4; // rlwimi r7,r7,27,$00000020 |
| 651 |
*lp++ = 0x4e800020; // blr |
| 652 |
|
| 653 |
// Patch DR emulator to jump to right address when an interrupt occurs |
| 654 |
lp = (uint32 *)(ROM_BASE + 0x370000); |
| 655 |
while (lp < (uint32 *)(ROM_BASE + 0x380000)) { |
| 656 |
if (*lp == 0x4ca80020) // bclr 5,8 |
| 657 |
goto dr_found; |
| 658 |
lp++; |
| 659 |
} |
| 660 |
D(bug("DR emulator patch location not found\n")); |
| 661 |
return false; |
| 662 |
dr_found: |
| 663 |
lp++; |
| 664 |
*lp = 0x48000000 + 0xf000 - ((uint32)lp & 0xffff); // b DR_CACHE_BASE+0x1f000 |
| 665 |
lp = (uint32 *)(ROM_BASE + 0x37f000); |
| 666 |
*lp++ = 0x3c000000 + ((ROM_BASE + 0x46d0a4) >> 16); // lis r0,xxx |
| 667 |
*lp++ = 0x60000000 + ((ROM_BASE + 0x46d0a4) & 0xffff); // ori r0,r0,xxx |
| 668 |
*lp++ = 0x7c0903a6; // mtctr r0 |
| 669 |
*lp = POWERPC_BCTR; // bctr |
| 670 |
return true; |
| 671 |
} |
| 672 |
|
| 673 |
// Nanokernel patches |
| 674 |
static bool patch_nanokernel(void) |
| 675 |
{ |
| 676 |
uint32 *lp; |
| 677 |
|
| 678 |
// Patch 68k emulator trap routine |
| 679 |
lp = (uint32 *)(ROM_BASE + 0x312994); // Always restore FPU state |
| 680 |
while (*lp != 0x39260040) lp++; |
| 681 |
lp--; |
| 682 |
*lp = 0x48000441; // bl 0x00312dd4 |
| 683 |
lp = (uint32 *)(ROM_BASE + 0x312dd8); // Don't modify MSR to turn on FPU |
| 684 |
while (*lp != 0x810600e4) lp++; |
| 685 |
lp--; |
| 686 |
*lp++ = POWERPC_NOP; |
| 687 |
lp += 2; |
| 688 |
*lp++ = POWERPC_NOP; |
| 689 |
lp++; |
| 690 |
*lp++ = POWERPC_NOP; |
| 691 |
*lp++ = POWERPC_NOP; |
| 692 |
*lp = POWERPC_NOP; |
| 693 |
|
| 694 |
// Patch trap return routine |
| 695 |
lp = (uint32 *)(ROM_BASE + 0x312c20); |
| 696 |
while (*lp != 0x7d5a03a6) lp++; |
| 697 |
*lp++ = 0x7d4903a6; // mtctr r10 |
| 698 |
*lp++ = 0x7daff120; // mtcr r13 |
| 699 |
*lp++ = 0x48000000 + 0x8000 - ((uint32)lp & 0xffff); // b ROM_BASE+0x318000 |
| 700 |
uint32 xlp = (uint32)lp & 0xffff; |
| 701 |
|
| 702 |
lp = (uint32 *)(ROM_BASE + 0x312c50); // Replace rfi |
| 703 |
while (*lp != 0x4c000064) lp++; |
| 704 |
*lp = POWERPC_BCTR; |
| 705 |
|
| 706 |
lp = (uint32 *)(ROM_BASE + 0x318000); |
| 707 |
*lp++ = 0x81400000 + XLM_IRQ_NEST; // lwz r10,XLM_IRQ_NEST |
| 708 |
*lp++ = 0x394affff; // subi r10,r10,1 |
| 709 |
*lp++ = 0x91400000 + XLM_IRQ_NEST; // stw r10,XLM_IRQ_NEST |
| 710 |
*lp = 0x48000000 + ((xlp - 0x800c) & 0x03fffffc); // b ROM_BASE+0x312c2c |
| 711 |
return true; |
| 712 |
} |
| 713 |
|
| 714 |
static bool patch_rom(void) |
| 715 |
{ |
| 716 |
// Detect ROM type |
| 717 |
if (!memcmp((void *)(ROM_BASE + 0x30d064), "Boot TNT", 8)) |
| 718 |
ROMType = ROMTYPE_TNT; |
| 719 |
else if (!memcmp((void *)(ROM_BASE + 0x30d064), "Boot Alchemy", 12)) |
| 720 |
ROMType = ROMTYPE_ALCHEMY; |
| 721 |
else if (!memcmp((void *)(ROM_BASE + 0x30d064), "Boot Zanzibar", 13)) |
| 722 |
ROMType = ROMTYPE_ZANZIBAR; |
| 723 |
else if (!memcmp((void *)(ROM_BASE + 0x30d064), "Boot Gazelle", 12)) |
| 724 |
ROMType = ROMTYPE_GAZELLE; |
| 725 |
else if (!memcmp((void *)(ROM_BASE + 0x30d064), "NewWorld", 8)) |
| 726 |
ROMType = ROMTYPE_NEWWORLD; |
| 727 |
else |
| 728 |
return false; |
| 729 |
|
| 730 |
// Apply patches |
| 731 |
if (!patch_nanokernel_boot()) return false; |
| 732 |
if (!patch_68k_emul()) return false; |
| 733 |
if (!patch_nanokernel()) return false; |
| 734 |
|
| 735 |
// Copy 68k emulator to 2MB boundary |
| 736 |
memcpy((void *)(ROM_BASE + ROM_SIZE), (void *)(ROM_BASE + ROM_SIZE - 0x100000), 0x100000); |
| 737 |
return true; |
| 738 |
} |
| 739 |
|
| 740 |
|
| 741 |
/* |
| 742 |
* Initialize 680x0 emulation |
| 743 |
*/ |
| 744 |
|
| 745 |
static asm void *get_toc(void) |
| 746 |
{ |
| 747 |
mr r3,r2 |
| 748 |
blr |
| 749 |
} |
| 750 |
|
| 751 |
bool Init680x0(void) |
| 752 |
{ |
| 753 |
char str[256]; |
| 754 |
|
| 755 |
// Mac address space = host address space |
| 756 |
RAMBaseMac = (uint32)RAMBaseHost; |
| 757 |
ROMBaseMac = (uint32)ROMBaseHost; |
| 758 |
|
| 759 |
// Get TOC pointer |
| 760 |
TOC = get_toc(); |
| 761 |
|
| 762 |
// Get system info |
| 763 |
get_system_info(&SysInfo); |
| 764 |
switch (SysInfo.cpu_type) { |
| 765 |
case B_CPU_PPC_601: |
| 766 |
PVR = 0x00010000; |
| 767 |
break; |
| 768 |
case B_CPU_PPC_603: |
| 769 |
PVR = 0x00030000; |
| 770 |
break; |
| 771 |
case B_CPU_PPC_603e: |
| 772 |
PVR = 0x00060000; |
| 773 |
break; |
| 774 |
case B_CPU_PPC_604: |
| 775 |
PVR = 0x00040000; |
| 776 |
break; |
| 777 |
case B_CPU_PPC_604e: |
| 778 |
PVR = 0x00090000; |
| 779 |
break; |
| 780 |
default: |
| 781 |
PVR = 0x00040000; |
| 782 |
break; |
| 783 |
} |
| 784 |
CPUClockSpeed = SysInfo.cpu_clock_speed; |
| 785 |
BusClockSpeed = SysInfo.bus_clock_speed; |
| 786 |
|
| 787 |
// Delete old areas |
| 788 |
area_id old_kernel_area = find_area(KERNEL_AREA_NAME); |
| 789 |
if (old_kernel_area > 0) |
| 790 |
delete_area(old_kernel_area); |
| 791 |
area_id old_dr_cache_area = find_area(DR_CACHE_AREA_NAME); |
| 792 |
if (old_dr_cache_area > 0) |
| 793 |
delete_area(old_dr_cache_area); |
| 794 |
|
| 795 |
// Create area for Kernel Data |
| 796 |
kernel_data = (KernelData *)0x68ffe000; |
| 797 |
kernel_area = create_area(KERNEL_AREA_NAME, &kernel_data, B_EXACT_ADDRESS, 0x2000, B_NO_LOCK, B_READ_AREA | B_WRITE_AREA); |
| 798 |
if (kernel_area < 0) { |
| 799 |
sprintf(str, GetString(STR_NO_KERNEL_DATA_ERR), strerror(kernel_area), kernel_area); |
| 800 |
ErrorAlert(str); |
| 801 |
return false; |
| 802 |
} |
| 803 |
emulator_data = &kernel_data->ed; |
| 804 |
KernelDataAddr = (uint32)kernel_data; |
| 805 |
D(bug("Kernel Data area %ld at %p, Emulator Data at %p\n", kernel_area, kernel_data, emulator_data)); |
| 806 |
|
| 807 |
// Load PowerMac ROM (upper 3MB) |
| 808 |
try { |
| 809 |
load_rom(); |
| 810 |
} catch (file_open_error) { |
| 811 |
ErrorAlert(GetString(STR_NO_ROM_FILE_ERR)); |
| 812 |
return false; |
| 813 |
} catch (file_read_error) { |
| 814 |
ErrorAlert(GetString(STR_ROM_FILE_READ_ERR)); |
| 815 |
return false; |
| 816 |
} catch (rom_size_error) { |
| 817 |
ErrorAlert(GetString(STR_ROM_SIZE_ERR)); |
| 818 |
return false; |
| 819 |
} |
| 820 |
|
| 821 |
// Install ROM patches |
| 822 |
if (!patch_rom()) { |
| 823 |
ErrorAlert("Unsupported PowerMac ROM version"); |
| 824 |
return false; |
| 825 |
} |
| 826 |
|
| 827 |
// Create area for DR Cache |
| 828 |
DRCacheAddr = DR_CACHE_BASE; |
| 829 |
dr_cache_area = create_area(DR_CACHE_AREA_NAME, (void **)&DRCacheAddr, B_EXACT_ADDRESS, DR_CACHE_SIZE, B_NO_LOCK, B_READ_AREA | B_WRITE_AREA); |
| 830 |
if (dr_cache_area < 0) { |
| 831 |
sprintf(str, GetString(STR_NO_KERNEL_DATA_ERR), strerror(dr_cache_area), dr_cache_area); |
| 832 |
ErrorAlert(str); |
| 833 |
return false; |
| 834 |
} |
| 835 |
D(bug("DR Cache area %ld at %p\n", dr_cache_area, DRCacheAddr)); |
| 836 |
|
| 837 |
// Initialize Kernel Data |
| 838 |
memset(kernel_data, 0, sizeof(KernelData)); |
| 839 |
if (ROMType == ROMTYPE_NEWWORLD) { |
| 840 |
kernel_data->v[0xc20 >> 2] = RAMSize; |
| 841 |
kernel_data->v[0xc24 >> 2] = RAMSize; |
| 842 |
kernel_data->v[0xc30 >> 2] = RAMSize; |
| 843 |
kernel_data->v[0xc34 >> 2] = RAMSize; |
| 844 |
kernel_data->v[0xc38 >> 2] = 0x00010020; |
| 845 |
kernel_data->v[0xc3c >> 2] = 0x00200001; |
| 846 |
kernel_data->v[0xc40 >> 2] = 0x00010000; |
| 847 |
kernel_data->v[0xc50 >> 2] = RAMBaseMac; |
| 848 |
kernel_data->v[0xc54 >> 2] = RAMSize; |
| 849 |
kernel_data->v[0xf60 >> 2] = PVR; |
| 850 |
kernel_data->v[0xf64 >> 2] = CPUClockSpeed; |
| 851 |
kernel_data->v[0xf68 >> 2] = BusClockSpeed; |
| 852 |
kernel_data->v[0xf6c >> 2] = CPUClockSpeed; |
| 853 |
} else { |
| 854 |
kernel_data->v[0xc80 >> 2] = RAMSize; |
| 855 |
kernel_data->v[0xc84 >> 2] = RAMSize; |
| 856 |
kernel_data->v[0xc90 >> 2] = RAMSize; |
| 857 |
kernel_data->v[0xc94 >> 2] = RAMSize; |
| 858 |
kernel_data->v[0xc98 >> 2] = 0x00010020; |
| 859 |
kernel_data->v[0xc9c >> 2] = 0x00200001; |
| 860 |
kernel_data->v[0xca0 >> 2] = 0x00010000; |
| 861 |
kernel_data->v[0xcb0 >> 2] = RAMBaseMac; |
| 862 |
kernel_data->v[0xcb4 >> 2] = RAMSize; |
| 863 |
kernel_data->v[0xf80 >> 2] = PVR; |
| 864 |
kernel_data->v[0xf84 >> 2] = CPUClockSpeed; |
| 865 |
kernel_data->v[0xf88 >> 2] = BusClockSpeed; |
| 866 |
kernel_data->v[0xf8c >> 2] = CPUClockSpeed; |
| 867 |
} |
| 868 |
|
| 869 |
// Initialize extra low memory |
| 870 |
memset((void *)0x2000, 0, 0x1000); |
| 871 |
*(uint32 *)XLM_RESET_STACK = 0x2000; // Reset stack pointer |
| 872 |
*(KernelData **)XLM_KERNEL_DATA = kernel_data;// For trap replacement routines |
| 873 |
*(void **)XLM_TOC = TOC; // TOC pointer of emulator |
| 874 |
*(uint32 *)XLM_PVR = PVR; // Theoretical PVR |
| 875 |
|
| 876 |
// Clear caches (as we loaded and patched code) |
| 877 |
clear_caches((void *)ROM_BASE, ROM_AREA_SIZE, B_INVALIDATE_ICACHE | B_FLUSH_DCACHE); |
| 878 |
return true; |
| 879 |
} |
| 880 |
|
| 881 |
|
| 882 |
/* |
| 883 |
* Deinitialize 680x0 emulation |
| 884 |
*/ |
| 885 |
|
| 886 |
void Exit680x0(void) |
| 887 |
{ |
| 888 |
// Delete DR Cache area |
| 889 |
if (dr_cache_area >= 0) |
| 890 |
delete_area(dr_cache_area); |
| 891 |
|
| 892 |
// Delete Kernel Data area |
| 893 |
if (kernel_area >= 0) |
| 894 |
delete_area(kernel_area); |
| 895 |
} |
| 896 |
|
| 897 |
|
| 898 |
/* |
| 899 |
* Quit emulator (must only be called from main thread) |
| 900 |
*/ |
| 901 |
|
| 902 |
asm void QuitEmulator(void) |
| 903 |
{ |
| 904 |
lwz r0,XLM_EMUL_RETURN_PROC |
| 905 |
mtlr r0 |
| 906 |
blr |
| 907 |
} |
| 908 |
|
| 909 |
|
| 910 |
/* |
| 911 |
* Reset and start 680x0 emulation |
| 912 |
*/ |
| 913 |
|
| 914 |
static asm void jump_to_rom(register uint32 entry) |
| 915 |
{ |
| 916 |
// Create stack frame |
| 917 |
mflr r0 |
| 918 |
stw r0,8(r1) |
| 919 |
mfcr r0 |
| 920 |
stw r0,4(r1) |
| 921 |
stwu r1,-(56+19*4+18*8)(r1) |
| 922 |
|
| 923 |
// Save PowerPC registers |
| 924 |
stmw r13,56(r1) |
| 925 |
stfd f14,56+19*4+0*8(r1) |
| 926 |
stfd f15,56+19*4+1*8(r1) |
| 927 |
stfd f16,56+19*4+2*8(r1) |
| 928 |
stfd f17,56+19*4+3*8(r1) |
| 929 |
stfd f18,56+19*4+4*8(r1) |
| 930 |
stfd f19,56+19*4+5*8(r1) |
| 931 |
stfd f20,56+19*4+6*8(r1) |
| 932 |
stfd f21,56+19*4+7*8(r1) |
| 933 |
stfd f22,56+19*4+8*8(r1) |
| 934 |
stfd f23,56+19*4+9*8(r1) |
| 935 |
stfd f24,56+19*4+10*8(r1) |
| 936 |
stfd f25,56+19*4+11*8(r1) |
| 937 |
stfd f26,56+19*4+12*8(r1) |
| 938 |
stfd f27,56+19*4+13*8(r1) |
| 939 |
stfd f28,56+19*4+14*8(r1) |
| 940 |
stfd f29,56+19*4+15*8(r1) |
| 941 |
stfd f30,56+19*4+16*8(r1) |
| 942 |
stfd f31,56+19*4+17*8(r1) |
| 943 |
|
| 944 |
// Move entry address to ctr, get pointer to Emulator Data |
| 945 |
mtctr r3 |
| 946 |
lwz r3,emulator_data(r2) |
| 947 |
|
| 948 |
// Skip over EMUL_RETURN routine and get its address |
| 949 |
bl @1 |
| 950 |
|
| 951 |
|
| 952 |
/* |
| 953 |
* EMUL_RETURN: Returned from emulator |
| 954 |
*/ |
| 955 |
|
| 956 |
// Restore PowerPC registers |
| 957 |
lwz r1,XLM_EMUL_RETURN_STACK |
| 958 |
lwz r2,XLM_TOC |
| 959 |
lmw r13,56(r1) |
| 960 |
lfd f14,56+19*4+0*8(r1) |
| 961 |
lfd f15,56+19*4+1*8(r1) |
| 962 |
lfd f16,56+19*4+2*8(r1) |
| 963 |
lfd f17,56+19*4+3*8(r1) |
| 964 |
lfd f18,56+19*4+4*8(r1) |
| 965 |
lfd f19,56+19*4+5*8(r1) |
| 966 |
lfd f20,56+19*4+6*8(r1) |
| 967 |
lfd f21,56+19*4+7*8(r1) |
| 968 |
lfd f22,56+19*4+8*8(r1) |
| 969 |
lfd f23,56+19*4+9*8(r1) |
| 970 |
lfd f24,56+19*4+10*8(r1) |
| 971 |
lfd f25,56+19*4+11*8(r1) |
| 972 |
lfd f26,56+19*4+12*8(r1) |
| 973 |
lfd f27,56+19*4+13*8(r1) |
| 974 |
lfd f28,56+19*4+14*8(r1) |
| 975 |
lfd f29,56+19*4+15*8(r1) |
| 976 |
lfd f30,56+19*4+16*8(r1) |
| 977 |
lfd f31,56+19*4+17*8(r1) |
| 978 |
|
| 979 |
// Exiting from 68k emulator |
| 980 |
li r0,1 |
| 981 |
stw r0,XLM_IRQ_NEST |
| 982 |
li r0,MODE_EMUL_OP |
| 983 |
stw r0,XLM_RUN_MODE |
| 984 |
|
| 985 |
// Return to caller of jump_to_rom() |
| 986 |
lwz r0,56+19*4+18*8+8(r1) |
| 987 |
mtlr r0 |
| 988 |
lwz r0,56+19*4+18*8+4(r1) |
| 989 |
mtcrf 0xff,r0 |
| 990 |
addi r1,r1,56+19*4+18*8 |
| 991 |
blr |
| 992 |
|
| 993 |
|
| 994 |
// Save address of EMUL_RETURN routine for 68k emulator patch |
| 995 |
@1 mflr r0 |
| 996 |
stw r0,XLM_EMUL_RETURN_PROC |
| 997 |
|
| 998 |
// Skip over EXEC_RETURN routine and get its address |
| 999 |
bl @2 |
| 1000 |
|
| 1001 |
|
| 1002 |
/* |
| 1003 |
* EXEC_RETURN: Returned from 68k routine executed with Execute68k() |
| 1004 |
*/ |
| 1005 |
|
| 1006 |
// Save r25 (contains current 68k interrupt level) |
| 1007 |
stw r25,XLM_68K_R25 |
| 1008 |
|
| 1009 |
// Reentering EMUL_OP mode |
| 1010 |
li r0,MODE_EMUL_OP |
| 1011 |
stw r0,XLM_RUN_MODE |
| 1012 |
|
| 1013 |
// Save 68k registers |
| 1014 |
lwz r4,56+19*4+18*8+12(r1) |
| 1015 |
stw r8,M68kRegisters.d[0](r4) |
| 1016 |
stw r9,M68kRegisters.d[1](r4) |
| 1017 |
stw r10,M68kRegisters.d[2](r4) |
| 1018 |
stw r11,M68kRegisters.d[3](r4) |
| 1019 |
stw r12,M68kRegisters.d[4](r4) |
| 1020 |
stw r13,M68kRegisters.d[5](r4) |
| 1021 |
stw r14,M68kRegisters.d[6](r4) |
| 1022 |
stw r15,M68kRegisters.d[7](r4) |
| 1023 |
stw r16,M68kRegisters.a[0](r4) |
| 1024 |
stw r17,M68kRegisters.a[1](r4) |
| 1025 |
stw r18,M68kRegisters.a[2](r4) |
| 1026 |
stw r19,M68kRegisters.a[3](r4) |
| 1027 |
stw r20,M68kRegisters.a[4](r4) |
| 1028 |
stw r21,M68kRegisters.a[5](r4) |
| 1029 |
stw r22,M68kRegisters.a[6](r4) |
| 1030 |
|
| 1031 |
// Restore PowerPC registers |
| 1032 |
lmw r13,56(r1) |
| 1033 |
#if SAVE_FP_EXEC_68K |
| 1034 |
lfd f14,56+19*4+0*8(r1) |
| 1035 |
lfd f15,56+19*4+1*8(r1) |
| 1036 |
lfd f16,56+19*4+2*8(r1) |
| 1037 |
lfd f17,56+19*4+3*8(r1) |
| 1038 |
lfd f18,56+19*4+4*8(r1) |
| 1039 |
lfd f19,56+19*4+5*8(r1) |
| 1040 |
lfd f20,56+19*4+6*8(r1) |
| 1041 |
lfd f21,56+19*4+7*8(r1) |
| 1042 |
lfd f22,56+19*4+8*8(r1) |
| 1043 |
lfd f23,56+19*4+9*8(r1) |
| 1044 |
lfd f24,56+19*4+10*8(r1) |
| 1045 |
lfd f25,56+19*4+11*8(r1) |
| 1046 |
lfd f26,56+19*4+12*8(r1) |
| 1047 |
lfd f27,56+19*4+13*8(r1) |
| 1048 |
lfd f28,56+19*4+14*8(r1) |
| 1049 |
lfd f29,56+19*4+15*8(r1) |
| 1050 |
lfd f30,56+19*4+16*8(r1) |
| 1051 |
lfd f31,56+19*4+17*8(r1) |
| 1052 |
#endif |
| 1053 |
|
| 1054 |
// Return to caller |
| 1055 |
lwz r0,56+19*4+18*8+8(r1) |
| 1056 |
mtlr r0 |
| 1057 |
addi r1,r1,56+19*4+18*8 |
| 1058 |
blr |
| 1059 |
|
| 1060 |
|
| 1061 |
// Stave address of EXEC_RETURN routine for 68k emulator patch |
| 1062 |
@2 mflr r0 |
| 1063 |
stw r0,XLM_EXEC_RETURN_PROC |
| 1064 |
|
| 1065 |
// Skip over EMUL_OP routine and get its address |
| 1066 |
bl @3 |
| 1067 |
|
| 1068 |
|
| 1069 |
/* |
| 1070 |
* EMUL_OP: Execute native routine, selector in r5 (my own private mode switch) |
| 1071 |
* |
| 1072 |
* 68k registers are stored in a M68kRegisters struct on the stack |
| 1073 |
* which the native routine may read and modify |
| 1074 |
*/ |
| 1075 |
|
| 1076 |
// Save r25 (contains current 68k interrupt level) |
| 1077 |
stw r25,XLM_68K_R25 |
| 1078 |
|
| 1079 |
// Entering EMUL_OP mode within 68k emulator |
| 1080 |
li r0,MODE_EMUL_OP |
| 1081 |
stw r0,XLM_RUN_MODE |
| 1082 |
|
| 1083 |
// Create PowerPC stack frame, reserve space for M68kRegisters |
| 1084 |
mr r3,r1 |
| 1085 |
subi r1,r1,56 // Fake "caller" frame |
| 1086 |
rlwinm r1,r1,0,0,29 // Align stack |
| 1087 |
|
| 1088 |
mfcr r0 |
| 1089 |
rlwinm r0,r0,0,11,8 |
| 1090 |
stw r0,4(r1) |
| 1091 |
mfxer r0 |
| 1092 |
stw r0,16(r1) |
| 1093 |
stw r2,12(r1) |
| 1094 |
stwu r1,-(56+16*4+15*8)(r1) |
| 1095 |
lwz r2,XLM_TOC |
| 1096 |
|
| 1097 |
// Save 68k registers |
| 1098 |
stw r8,56+M68kRegisters.d[0](r1) |
| 1099 |
stw r9,56+M68kRegisters.d[1](r1) |
| 1100 |
stw r10,56+M68kRegisters.d[2](r1) |
| 1101 |
stw r11,56+M68kRegisters.d[3](r1) |
| 1102 |
stw r12,56+M68kRegisters.d[4](r1) |
| 1103 |
stw r13,56+M68kRegisters.d[5](r1) |
| 1104 |
stw r14,56+M68kRegisters.d[6](r1) |
| 1105 |
stw r15,56+M68kRegisters.d[7](r1) |
| 1106 |
stw r16,56+M68kRegisters.a[0](r1) |
| 1107 |
stw r17,56+M68kRegisters.a[1](r1) |
| 1108 |
stw r18,56+M68kRegisters.a[2](r1) |
| 1109 |
stw r19,56+M68kRegisters.a[3](r1) |
| 1110 |
stw r20,56+M68kRegisters.a[4](r1) |
| 1111 |
stw r21,56+M68kRegisters.a[5](r1) |
| 1112 |
stw r22,56+M68kRegisters.a[6](r1) |
| 1113 |
stw r3,56+M68kRegisters.a[7](r1) |
| 1114 |
stfd f0,56+16*4+0*8(r1) |
| 1115 |
stfd f1,56+16*4+1*8(r1) |
| 1116 |
stfd f2,56+16*4+2*8(r1) |
| 1117 |
stfd f3,56+16*4+3*8(r1) |
| 1118 |
stfd f4,56+16*4+4*8(r1) |
| 1119 |
stfd f5,56+16*4+5*8(r1) |
| 1120 |
stfd f6,56+16*4+6*8(r1) |
| 1121 |
stfd f7,56+16*4+7*8(r1) |
| 1122 |
mffs f0 |
| 1123 |
stfd f8,56+16*4+8*8(r1) |
| 1124 |
stfd f9,56+16*4+9*8(r1) |
| 1125 |
stfd f10,56+16*4+10*8(r1) |
| 1126 |
stfd f11,56+16*4+11*8(r1) |
| 1127 |
stfd f12,56+16*4+12*8(r1) |
| 1128 |
stfd f13,56+16*4+13*8(r1) |
| 1129 |
stfd f0,56+16*4+14*8(r1) |
| 1130 |
|
| 1131 |
// Execute native routine |
| 1132 |
mr r3,r5 |
| 1133 |
addi r4,r1,56 |
| 1134 |
bl EmulOp |
| 1135 |
|
| 1136 |
// Restore 68k registers |
| 1137 |
lwz r8,56+M68kRegisters.d[0](r1) |
| 1138 |
lwz r9,56+M68kRegisters.d[1](r1) |
| 1139 |
lwz r10,56+M68kRegisters.d[2](r1) |
| 1140 |
lwz r11,56+M68kRegisters.d[3](r1) |
| 1141 |
lwz r12,56+M68kRegisters.d[4](r1) |
| 1142 |
lwz r13,56+M68kRegisters.d[5](r1) |
| 1143 |
lwz r14,56+M68kRegisters.d[6](r1) |
| 1144 |
lwz r15,56+M68kRegisters.d[7](r1) |
| 1145 |
lwz r16,56+M68kRegisters.a[0](r1) |
| 1146 |
lwz r17,56+M68kRegisters.a[1](r1) |
| 1147 |
lwz r18,56+M68kRegisters.a[2](r1) |
| 1148 |
lwz r19,56+M68kRegisters.a[3](r1) |
| 1149 |
lwz r20,56+M68kRegisters.a[4](r1) |
| 1150 |
lwz r21,56+M68kRegisters.a[5](r1) |
| 1151 |
lwz r22,56+M68kRegisters.a[6](r1) |
| 1152 |
lwz r3,56+M68kRegisters.a[7](r1) |
| 1153 |
lfd f13,56+16*4+14*8(r1) |
| 1154 |
lfd f0,56+16*4+0*8(r1) |
| 1155 |
lfd f1,56+16*4+1*8(r1) |
| 1156 |
lfd f2,56+16*4+2*8(r1) |
| 1157 |
lfd f3,56+16*4+3*8(r1) |
| 1158 |
lfd f4,56+16*4+4*8(r1) |
| 1159 |
lfd f5,56+16*4+5*8(r1) |
| 1160 |
lfd f6,56+16*4+6*8(r1) |
| 1161 |
lfd f7,56+16*4+7*8(r1) |
| 1162 |
mtfsf 0xff,f13 |
| 1163 |
lfd f8,56+16*4+8*8(r1) |
| 1164 |
lfd f9,56+16*4+9*8(r1) |
| 1165 |
lfd f10,56+16*4+10*8(r1) |
| 1166 |
lfd f11,56+16*4+11*8(r1) |
| 1167 |
lfd f12,56+16*4+12*8(r1) |
| 1168 |
lfd f13,56+16*4+13*8(r1) |
| 1169 |
|
| 1170 |
// Delete PowerPC stack frame |
| 1171 |
lwz r2,56+16*4+15*8+12(r1) |
| 1172 |
lwz r0,56+16*4+15*8+16(r1) |
| 1173 |
mtxer r0 |
| 1174 |
lwz r0,56+16*4+15*8+4(r1) |
| 1175 |
mtcrf 0xff,r0 |
| 1176 |
mr r1,r3 |
| 1177 |
|
| 1178 |
// Reeintering 68k emulator |
| 1179 |
li r0,MODE_68K |
| 1180 |
stw r0,XLM_RUN_MODE |
| 1181 |
|
| 1182 |
// Set r0 to 0 for 68k emulator |
| 1183 |
li r0,0 |
| 1184 |
|
| 1185 |
// Execute next 68k opcode |
| 1186 |
rlwimi r29,r27,3,13,28 |
| 1187 |
lhau r27,2(r24) |
| 1188 |
mtlr r29 |
| 1189 |
blr |
| 1190 |
|
| 1191 |
|
| 1192 |
// Save address of EMUL_OP routine for 68k emulator patch |
| 1193 |
@3 mflr r0 |
| 1194 |
stw r0,XLM_EMUL_OP_PROC |
| 1195 |
|
| 1196 |
// Save stack pointer for EMUL_RETURN |
| 1197 |
stw r1,XLM_EMUL_RETURN_STACK |
| 1198 |
|
| 1199 |
// Preset registers for ROM boot routine |
| 1200 |
lis r3,0x40b0 // Pointer to ROM boot structure |
| 1201 |
ori r3,r3,0xd000 |
| 1202 |
|
| 1203 |
// 68k emulator is now active |
| 1204 |
li r0,MODE_68K |
| 1205 |
stw r0,XLM_RUN_MODE |
| 1206 |
|
| 1207 |
// Jump to ROM |
| 1208 |
bctr |
| 1209 |
} |
| 1210 |
|
| 1211 |
void Start680x0(void) |
| 1212 |
{ |
| 1213 |
// Install interrupt signal handler |
| 1214 |
sigemptyset(&sigusr1_action.sa_mask); |
| 1215 |
sigusr1_action.sa_handler = (__signal_func_ptr)(sigusr1_handler); |
| 1216 |
sigusr1_action.sa_flags = 0; |
| 1217 |
sigusr1_action.sa_userdata = NULL; |
| 1218 |
sigaction(SIGUSR1, &sigusr1_action, NULL); |
| 1219 |
|
| 1220 |
// Install signal stack |
| 1221 |
set_signal_stack(malloc(SIG_STACK_SIZE), SIG_STACK_SIZE); |
| 1222 |
|
| 1223 |
// We're now ready to receive signals |
| 1224 |
ReadyForSignals = true; |
| 1225 |
|
| 1226 |
D(bug("Jumping to ROM\n")); |
| 1227 |
jump_to_rom(ROM_BASE + 0x310000); |
| 1228 |
D(bug("Returned from ROM\n")); |
| 1229 |
|
| 1230 |
// We're no longer ready to receive signals |
| 1231 |
ReadyForSignals = false; |
| 1232 |
} |
| 1233 |
|
| 1234 |
|
| 1235 |
/* |
| 1236 |
* Trigger interrupt |
| 1237 |
*/ |
| 1238 |
|
| 1239 |
void TriggerInterrupt(void) |
| 1240 |
{ |
| 1241 |
if (emul_thread > 0 && ReadyForSignals) |
| 1242 |
send_signal(emul_thread, SIGUSR1); |
| 1243 |
} |
| 1244 |
|
| 1245 |
void TriggerNMI(void) |
| 1246 |
{ |
| 1247 |
//!! not implemented yet |
| 1248 |
} |
| 1249 |
|
| 1250 |
|
| 1251 |
/* |
| 1252 |
* Execute 68k subroutine |
| 1253 |
* r->a[7] and r->sr are unused! |
| 1254 |
*/ |
| 1255 |
|
| 1256 |
static asm void execute_68k(register uint32 addr, register M68kRegisters *r) |
| 1257 |
{ |
| 1258 |
// Create stack frame |
| 1259 |
mflr r0 |
| 1260 |
stw r0,8(r1) |
| 1261 |
stw r4,12(r1) |
| 1262 |
stwu r1,-(56+19*4+18*8)(r1) |
| 1263 |
|
| 1264 |
// Save PowerPC registers |
| 1265 |
stmw r13,56(r1) |
| 1266 |
#if SAVE_FP_EXEC_68K |
| 1267 |
stfd f14,56+19*4+0*8(r1) |
| 1268 |
stfd f15,56+19*4+1*8(r1) |
| 1269 |
stfd f16,56+19*4+2*8(r1) |
| 1270 |
stfd f17,56+19*4+3*8(r1) |
| 1271 |
stfd f18,56+19*4+4*8(r1) |
| 1272 |
stfd f19,56+19*4+5*8(r1) |
| 1273 |
stfd f20,56+19*4+6*8(r1) |
| 1274 |
stfd f21,56+19*4+7*8(r1) |
| 1275 |
stfd f22,56+19*4+8*8(r1) |
| 1276 |
stfd f23,56+19*4+9*8(r1) |
| 1277 |
stfd f24,56+19*4+10*8(r1) |
| 1278 |
stfd f25,56+19*4+11*8(r1) |
| 1279 |
stfd f26,56+19*4+12*8(r1) |
| 1280 |
stfd f27,56+19*4+13*8(r1) |
| 1281 |
stfd f28,56+19*4+14*8(r1) |
| 1282 |
stfd f29,56+19*4+15*8(r1) |
| 1283 |
stfd f30,56+19*4+16*8(r1) |
| 1284 |
stfd f31,56+19*4+17*8(r1) |
| 1285 |
#endif |
| 1286 |
|
| 1287 |
// Set up registers for 68k emulator |
| 1288 |
lwz r31,XLM_KERNEL_DATA // Pointer to Kernel Data |
| 1289 |
addi r31,r31,0x1000 // points to Emulator Data |
| 1290 |
li r0,0 |
| 1291 |
mtcrf 0xff,r0 |
| 1292 |
creqv 11,11,11 // Supervisor mode |
| 1293 |
lwz r8,M68kRegisters.d[0](r4) |
| 1294 |
lwz r9,M68kRegisters.d[1](r4) |
| 1295 |
lwz r10,M68kRegisters.d[2](r4) |
| 1296 |
lwz r11,M68kRegisters.d[3](r4) |
| 1297 |
lwz r12,M68kRegisters.d[4](r4) |
| 1298 |
lwz r13,M68kRegisters.d[5](r4) |
| 1299 |
lwz r14,M68kRegisters.d[6](r4) |
| 1300 |
lwz r15,M68kRegisters.d[7](r4) |
| 1301 |
lwz r16,M68kRegisters.a[0](r4) |
| 1302 |
lwz r17,M68kRegisters.a[1](r4) |
| 1303 |
lwz r18,M68kRegisters.a[2](r4) |
| 1304 |
lwz r19,M68kRegisters.a[3](r4) |
| 1305 |
lwz r20,M68kRegisters.a[4](r4) |
| 1306 |
lwz r21,M68kRegisters.a[5](r4) |
| 1307 |
lwz r22,M68kRegisters.a[6](r4) |
| 1308 |
li r23,0 |
| 1309 |
mr r24,r3 |
| 1310 |
lwz r25,XLM_68K_R25 // MSB of SR |
| 1311 |
li r26,0 |
| 1312 |
li r28,0 // VBR |
| 1313 |
lwz r29,0x74(r31) // Pointer to opcode table |
| 1314 |
lwz r30,0x78(r31) // Address of emulator |
| 1315 |
|
| 1316 |
// Reentering 68k emulator |
| 1317 |
li r0,MODE_68K |
| 1318 |
stw r0,XLM_RUN_MODE |
| 1319 |
|
| 1320 |
// Set r0 to 0 for 68k emulator |
| 1321 |
li r0,0 |
| 1322 |
|
| 1323 |
// Execute 68k opcode |
| 1324 |
lha r27,0(r24) |
| 1325 |
rlwimi r29,r27,3,13,28 |
| 1326 |
lhau r27,2(r24) |
| 1327 |
mtlr r29 |
| 1328 |
blr |
| 1329 |
} |
| 1330 |
|
| 1331 |
void Execute68k(uint32 addr, M68kRegisters *r) |
| 1332 |
{ |
| 1333 |
uint16 proc[4] = {M68K_JSR, addr >> 16, addr & 0xffff, M68K_EXEC_RETURN}; |
| 1334 |
execute_68k((uint32)proc, r); |
| 1335 |
} |
| 1336 |
|
| 1337 |
|
| 1338 |
/* |
| 1339 |
* Execute MacOS 68k trap |
| 1340 |
* r->a[7] and r->sr are unused! |
| 1341 |
*/ |
| 1342 |
|
| 1343 |
void Execute68kTrap(uint16 trap, struct M68kRegisters *r) |
| 1344 |
{ |
| 1345 |
uint16 proc[2] = {trap, M68K_EXEC_RETURN}; |
| 1346 |
execute_68k((uint32)proc, r); |
| 1347 |
} |
| 1348 |
|
| 1349 |
|
| 1350 |
/* |
| 1351 |
* USR1 handler |
| 1352 |
*/ |
| 1353 |
|
| 1354 |
static void sigusr1_handler(int sig, void *arg, vregs *r) |
| 1355 |
{ |
| 1356 |
// Do nothing if interrupts are disabled |
| 1357 |
if ((*(int32 *)XLM_IRQ_NEST) > 0) |
| 1358 |
return; |
| 1359 |
|
| 1360 |
// 68k emulator active? Then trigger 68k interrupt level 1 |
| 1361 |
if (*(uint32 *)XLM_RUN_MODE == MODE_68K) { |
| 1362 |
*(uint16 *)(kernel_data->v[0x67c >> 2]) = 1; |
| 1363 |
r->cr |= kernel_data->v[0x674 >> 2]; |
| 1364 |
} |
| 1365 |
} |
