src/Windows/main_windows.cpp

/*
 *  main_windows.cpp - Emulation core, Windows implementation
 *
 *  SheepShaver (C) 1997-2004 Christian Bauer and Marc Hellwig
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <SDL.h>

#include "sysdeps.h"
#include "main.h"
#include "version.h"
#include "prefs.h"
#include "prefs_editor.h"
#include "cpu_emulation.h"
#include "emul_op.h"
#include "xlowmem.h"
#include "xpram.h"
#include "timer.h"
#include "adb.h"
#include "sony.h"
#include "disk.h"
#include "cdrom.h"
#include "scsi.h"
#include "video.h"
#include "audio.h"
#include "ether.h"
#include "serial.h"
#include "clip.h"
#include "extfs.h"
#include "sys.h"
#include "macos_util.h"
#include "rom_patches.h"
#include "user_strings.h"
#include "vm_alloc.h"
#include "sigsegv.h"
#include "thunks.h"
#include "util_windows.h"

#define DEBUG 0
#include "debug.h"

#ifdef ENABLE_MON
#include "mon.h"
#endif


// Constants
const char ROM_FILE_NAME[] = "ROM";
const char ROM_FILE_NAME2[] = "Mac OS ROM";

const uintptr RAM_BASE = 0x10000000;            // Base address of RAM
const uint32 SIG_STACK_SIZE = 0x10000;          // Size of signal stack


// Global variables (exported)
uint32 RAMBase;                 // Base address of Mac RAM
uint32 RAMSize;                 // Size of Mac RAM
uint32 KernelDataAddr;  // Address of Kernel Data
uint32 BootGlobsAddr;   // Address of BootGlobs structure at top of Mac RAM
uint32 DRCacheAddr;             // Address of DR Cache
uint32 PVR;                             // Theoretical PVR
int64 CPUClockSpeed;    // Processor clock speed (Hz)
int64 BusClockSpeed;    // Bus clock speed (Hz)
int64 TimebaseSpeed;    // Timebase clock speed (Hz)
uint8 *RAMBaseHost;             // Base address of Mac RAM (host address space)
uint8 *ROMBaseHost;             // Base address of Mac ROM (host address space)


// Global variables
static bool lm_area_mapped = false;                     // Flag: Low Memory area mmap()ped
static int kernel_area = -1;                            // SHM ID of Kernel Data area
static bool rom_area_mapped = false;            // Flag: Mac ROM mmap()ped
static bool ram_area_mapped = false;            // Flag: Mac RAM mmap()ped
static bool dr_cache_area_mapped = false;       // Flag: Mac DR Cache mmap()ped
static bool dr_emulator_area_mapped = false;// Flag: Mac DR Emulator mmap()ped
static KernelData *kernel_data;                         // Pointer to Kernel Data
static EmulatorData *emulator_data;

static uint8 last_xpram[XPRAM_SIZE];            // Buffer for monitoring XPRAM changes
static bool nvram_thread_active = false;        // Flag: NVRAM watchdog installed
static volatile bool nvram_thread_cancel;       // Flag: Cancel NVRAM thread
static HANDLE nvram_thread = NULL;                      // NVRAM watchdog
static bool tick_thread_active = false;         // Flag: MacOS thread installed
static volatile bool tick_thread_cancel;        // Flag: Cancel 60Hz thread
static HANDLE tick_thread = NULL;                       // 60Hz thread
static HANDLE emul_thread = NULL;                       // MacOS thread
static uintptr sig_stack = 0;                           // Stack for PowerPC interrupt routine

uint32  SheepMem::page_size;                            // Size of a native page
uintptr SheepMem::zero_page = 0;                        // Address of ro page filled in with zeros
uintptr SheepMem::base = 0x60000000;            // Address of SheepShaver data
uintptr SheepMem::proc;                                         // Bottom address of SheepShave procedures
uintptr SheepMem::data;                                         // Top of SheepShaver data (stack like storage)


// Prototypes
static bool kernel_data_init(void);
static void kernel_data_exit(void);
static void Quit(void);
static DWORD WINAPI nvram_func(void *arg);
static DWORD WINAPI tick_func(void *arg);

static void jump_to_rom(uint32 entry);
extern void emul_ppc(uint32 start);
extern void init_emul_ppc(void);
extern void exit_emul_ppc(void);
sigsegv_return_t sigsegv_handler(sigsegv_address_t, sigsegv_address_t);


/*
 *  Return signal stack base
 */

uintptr SignalStackBase(void)
{
        return sig_stack + SIG_STACK_SIZE;
}


/*
 *  Memory management helpers
 */

static inline int vm_mac_acquire(uint32 addr, uint32 size)
{
        return vm_acquire_fixed(Mac2HostAddr(addr), size);
}

static inline int vm_mac_release(uint32 addr, uint32 size)
{
        return vm_release(Mac2HostAddr(addr), size);
}


/*
 *  Main program
 */

static void usage(const char *prg_name)
{
        printf("Usage: %s [OPTION...]\n", prg_name);
        printf("\nUnix options:\n");
        printf("  --display STRING\n    X display to use\n");
        PrefsPrintUsage();
        exit(0);
}

int main(int argc, char **argv)
{
        char str[256];
        int16 i16;
        HANDLE rom_fh;
        const char *rom_path;
        uint32 rom_size;
        DWORD actual;
        uint8 *rom_tmp;

        // Initialize variables
        RAMBase = 0;
        tzset();

        // Print some info
        printf(GetString(STR_ABOUT_TEXT1), VERSION_MAJOR, VERSION_MINOR);
        printf(" %s\n", GetString(STR_ABOUT_TEXT2));

        // Read preferences
        PrefsInit(argc, argv);

        // Parse command line arguments
        for (int i=1; i<argc; i++) {
                if (strcmp(argv[i], "--help") == 0) {
                        usage(argv[0]);
                } else if (argv[i][0] == '-') {
                        fprintf(stderr, "Unrecognized option '%s'\n", argv[i]);
                        usage(argv[0]);
                }
        }

        // Initialize SDL system
        int sdl_flags = 0;
#ifdef USE_SDL_VIDEO
        sdl_flags |= SDL_INIT_VIDEO;
#endif
#ifdef USE_SDL_AUDIO
        sdl_flags |= SDL_INIT_AUDIO;
#endif
        assert(sdl_flags != 0);
        if (SDL_Init(sdl_flags) == -1) {
                char str[256];
                sprintf(str, "Could not initialize SDL: %s.\n", SDL_GetError());
                ErrorAlert(str);
                goto quit;
        }
        atexit(SDL_Quit);

#ifdef ENABLE_MON
        // Initialize mon
        mon_init();
#endif

        // Install SIGSEGV handler for CPU emulator
        if (!sigsegv_install_handler(sigsegv_handler)) {
                sprintf(str, GetString(STR_SIGSEGV_INSTALL_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }

        // Initialize VM system
        vm_init();

        // Get system info
        PVR = 0x00040000;                       // Default: 604
        CPUClockSpeed = 100000000;      // Default: 100MHz
        BusClockSpeed = 100000000;      // Default: 100MHz
        TimebaseSpeed =  25000000;      // Default:  25MHz
        PVR = 0x000c0000;                       // Default: 7400 (with AltiVec)
        D(bug("PVR: %08x (assumed)\n", PVR));

        // Init system routines
        SysInit();

        // Show preferences editor
        if (!PrefsFindBool("nogui"))
                if (!PrefsEditor())
                        goto quit;

        // Create Low Memory area (0x0000..0x3000)
        if (vm_mac_acquire(0, 0x3000) < 0) {
                sprintf(str, GetString(STR_LOW_MEM_MMAP_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }
        lm_area_mapped = true;

        // Create areas for Kernel Data
        if (!kernel_data_init())
                goto quit;
        kernel_data = (KernelData *)Mac2HostAddr(KERNEL_DATA_BASE);
        emulator_data = &kernel_data->ed;
        KernelDataAddr = KERNEL_DATA_BASE;
        D(bug("Kernel Data at %p (%08x)\n", kernel_data, KERNEL_DATA_BASE));
        D(bug("Emulator Data at %p (%08x)\n", emulator_data, KERNEL_DATA_BASE + offsetof(KernelData, ed)));

        // Create area for DR Cache
        if (vm_mac_acquire(DR_EMULATOR_BASE, DR_EMULATOR_SIZE) < 0) {
                sprintf(str, GetString(STR_DR_EMULATOR_MMAP_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }
        dr_emulator_area_mapped = true;
        if (vm_mac_acquire(DR_CACHE_BASE, DR_CACHE_SIZE) < 0) {
                sprintf(str, GetString(STR_DR_CACHE_MMAP_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }
        dr_cache_area_mapped = true;
        DRCacheAddr = (uint32)Mac2HostAddr(DR_CACHE_BASE);
        D(bug("DR Cache at %p (%08x)\n", DRCacheAddr, DR_CACHE_BASE));

        // Create area for SheepShaver data
        if (!SheepMem::Init()) {
                sprintf(str, GetString(STR_SHEEP_MEM_MMAP_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }

        // Create area for Mac ROM
        if (vm_mac_acquire(ROM_BASE, ROM_AREA_SIZE) < 0) {
                sprintf(str, GetString(STR_ROM_MMAP_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }
        ROMBaseHost = Mac2HostAddr(ROM_BASE);
        rom_area_mapped = true;
        D(bug("ROM area at %p (%08x)\n", ROMBaseHost, ROM_BASE));

        // Create area for Mac RAM
        RAMSize = PrefsFindInt32("ramsize");
        if (RAMSize < 8*1024*1024) {
                WarningAlert(GetString(STR_SMALL_RAM_WARN));
                RAMSize = 8*1024*1024;
        }

        if (vm_mac_acquire(RAM_BASE, RAMSize) < 0) {
                sprintf(str, GetString(STR_RAM_MMAP_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }
        RAMBaseHost = Mac2HostAddr(RAM_BASE);
        RAMBase = RAM_BASE;
        ram_area_mapped = true;
        D(bug("RAM area at %p (%08x)\n", RAMBaseHost, RAMBase));

        if (RAMBase > ROM_BASE) {
                ErrorAlert(GetString(STR_RAM_HIGHER_THAN_ROM_ERR));
                goto quit;
        }

        // Load Mac ROM
        rom_path = PrefsFindString("rom");
        rom_fh = CreateFile(rom_path ? rom_path : ROM_FILE_NAME,
                                                GENERIC_READ, 0, NULL, OPEN_EXISTING,
                                                FILE_ATTRIBUTE_NORMAL, NULL);

        if (rom_fh == INVALID_HANDLE_VALUE) {
                rom_fh = CreateFile(rom_path ? rom_path : ROM_FILE_NAME2,
                                                        GENERIC_READ, 0, NULL, OPEN_EXISTING,
                                                        FILE_ATTRIBUTE_NORMAL, NULL);

                if (rom_fh == INVALID_HANDLE_VALUE) {
                        ErrorAlert(GetString(STR_NO_ROM_FILE_ERR));
                        goto quit;
                }
        }
        printf(GetString(STR_READING_ROM_FILE));
        rom_size = GetFileSize(rom_fh, NULL);
        rom_tmp = new uint8[ROM_SIZE];
        ReadFile(rom_fh, (void *)rom_tmp, ROM_SIZE, &actual, NULL);
        CloseHandle(rom_fh);
        
        // Decode Mac ROM
        if (!DecodeROM(rom_tmp, actual)) {
                if (rom_size != 4*1024*1024) {
                        ErrorAlert(GetString(STR_ROM_SIZE_ERR));
                        goto quit;
                } else {
                        ErrorAlert(GetString(STR_ROM_FILE_READ_ERR));
                        goto quit;
                }
        }
        delete[] rom_tmp;

        // Load NVRAM
        XPRAMInit();

        // Load XPRAM default values if signature not found
        if (XPRAM[0x130c] != 0x4e || XPRAM[0x130d] != 0x75
         || XPRAM[0x130e] != 0x4d || XPRAM[0x130f] != 0x63) {
                D(bug("Loading XPRAM default values\n"));
                memset(XPRAM + 0x1300, 0, 0x100);
                XPRAM[0x130c] = 0x4e;   // "NuMc" signature
                XPRAM[0x130d] = 0x75;
                XPRAM[0x130e] = 0x4d;
                XPRAM[0x130f] = 0x63;
                XPRAM[0x1301] = 0x80;   // InternalWaitFlags = DynWait (don't wait for SCSI devices upon bootup)
                XPRAM[0x1310] = 0xa8;   // Standard PRAM values
                XPRAM[0x1311] = 0x00;
                XPRAM[0x1312] = 0x00;
                XPRAM[0x1313] = 0x22;
                XPRAM[0x1314] = 0xcc;
                XPRAM[0x1315] = 0x0a;
                XPRAM[0x1316] = 0xcc;
                XPRAM[0x1317] = 0x0a;
                XPRAM[0x131c] = 0x00;
                XPRAM[0x131d] = 0x02;
                XPRAM[0x131e] = 0x63;
                XPRAM[0x131f] = 0x00;
                XPRAM[0x1308] = 0x13;
                XPRAM[0x1309] = 0x88;
                XPRAM[0x130a] = 0x00;
                XPRAM[0x130b] = 0xcc;
                XPRAM[0x1376] = 0x00;   // OSDefault = MacOS
                XPRAM[0x1377] = 0x01;
        }

        // Set boot volume
        i16 = PrefsFindInt32("bootdrive");
        XPRAM[0x1378] = i16 >> 8;
        XPRAM[0x1379] = i16 & 0xff;
        i16 = PrefsFindInt32("bootdriver");
        XPRAM[0x137a] = i16 >> 8;
        XPRAM[0x137b] = i16 & 0xff;

        // Create BootGlobs at top of Mac memory
        memset(RAMBaseHost + RAMSize - 4096, 0, 4096);
        BootGlobsAddr = RAMBase + RAMSize - 0x1c;
        WriteMacInt32(BootGlobsAddr - 5 * 4, RAMBase + RAMSize);        // MemTop
        WriteMacInt32(BootGlobsAddr + 0 * 4, RAMBase);                          // First RAM bank
        WriteMacInt32(BootGlobsAddr + 1 * 4, RAMSize);
        WriteMacInt32(BootGlobsAddr + 2 * 4, (uint32)-1);                       // End of bank table

        // Init thunks
        if (!ThunksInit())
                goto quit;

        // Init drivers
        SonyInit();
        DiskInit();
        CDROMInit();
        SCSIInit();

        // Init external file system
        ExtFSInit(); 

        // Init ADB
        ADBInit();

        // Init audio
        AudioInit();

        // Init network
        EtherInit();

        // Init serial ports
        SerialInit();

        // Init Time Manager
        timer_init();

        // Init clipboard
        ClipInit();

        // Init video
        if (!VideoInit())
                goto quit;

        // Install ROM patches
        if (!PatchROM()) {
                ErrorAlert(GetString(STR_UNSUPPORTED_ROM_TYPE_ERR));
                goto quit;
        }

        // Write protect ROM
        vm_protect(ROMBaseHost, ROM_AREA_SIZE, VM_PAGE_READ | VM_PAGE_EXECUTE);

        // Initialize Kernel Data
        memset(kernel_data, 0, sizeof(KernelData));
        if (ROMType == ROMTYPE_NEWWORLD) {
                uint32 of_dev_tree = SheepMem::Reserve(4 * sizeof(uint32));
                Mac_memset(of_dev_tree, 0, 4 * sizeof(uint32));
                uint32 vector_lookup_tbl = SheepMem::Reserve(128);
                uint32 vector_mask_tbl = SheepMem::Reserve(64);
                memset((uint8 *)kernel_data + 0xb80, 0x3d, 0x80);
                Mac_memset(vector_lookup_tbl, 0, 128);
                Mac_memset(vector_mask_tbl, 0, 64);
                kernel_data->v[0xb80 >> 2] = htonl(ROM_BASE);
                kernel_data->v[0xb84 >> 2] = htonl(of_dev_tree);                        // OF device tree base
                kernel_data->v[0xb90 >> 2] = htonl(vector_lookup_tbl);
                kernel_data->v[0xb94 >> 2] = htonl(vector_mask_tbl);
                kernel_data->v[0xb98 >> 2] = htonl(ROM_BASE);                           // OpenPIC base
                kernel_data->v[0xbb0 >> 2] = htonl(0);                                          // ADB base
                kernel_data->v[0xc20 >> 2] = htonl(RAMSize);
                kernel_data->v[0xc24 >> 2] = htonl(RAMSize);
                kernel_data->v[0xc30 >> 2] = htonl(RAMSize);
                kernel_data->v[0xc34 >> 2] = htonl(RAMSize);
                kernel_data->v[0xc38 >> 2] = htonl(0x00010020);
                kernel_data->v[0xc3c >> 2] = htonl(0x00200001);
                kernel_data->v[0xc40 >> 2] = htonl(0x00010000);
                kernel_data->v[0xc50 >> 2] = htonl(RAMBase);
                kernel_data->v[0xc54 >> 2] = htonl(RAMSize);
                kernel_data->v[0xf60 >> 2] = htonl(PVR);
                kernel_data->v[0xf64 >> 2] = htonl(CPUClockSpeed);                      // clock-frequency
                kernel_data->v[0xf68 >> 2] = htonl(BusClockSpeed);                      // bus-frequency
                kernel_data->v[0xf6c >> 2] = htonl(TimebaseSpeed);                      // timebase-frequency
        } else {
                kernel_data->v[0xc80 >> 2] = htonl(RAMSize);
                kernel_data->v[0xc84 >> 2] = htonl(RAMSize);
                kernel_data->v[0xc90 >> 2] = htonl(RAMSize);
                kernel_data->v[0xc94 >> 2] = htonl(RAMSize);
                kernel_data->v[0xc98 >> 2] = htonl(0x00010020);
                kernel_data->v[0xc9c >> 2] = htonl(0x00200001);
                kernel_data->v[0xca0 >> 2] = htonl(0x00010000);
                kernel_data->v[0xcb0 >> 2] = htonl(RAMBase);
                kernel_data->v[0xcb4 >> 2] = htonl(RAMSize);
                kernel_data->v[0xf80 >> 2] = htonl(PVR);
                kernel_data->v[0xf84 >> 2] = htonl(CPUClockSpeed);                      // clock-frequency
                kernel_data->v[0xf88 >> 2] = htonl(BusClockSpeed);                      // bus-frequency
                kernel_data->v[0xf8c >> 2] = htonl(TimebaseSpeed);                      // timebase-frequency
        }

        // Initialize extra low memory
        D(bug("Initializing Low Memory...\n"));
        Mac_memset(0, 0, 0x3000);
        WriteMacInt32(XLM_SIGNATURE, FOURCC('B','a','a','h'));                  // Signature to detect SheepShaver
        WriteMacInt32(XLM_KERNEL_DATA, KernelDataAddr);                                 // For trap replacement routines
        WriteMacInt32(XLM_PVR, PVR);                                                                    // Theoretical PVR
        WriteMacInt32(XLM_BUS_CLOCK, BusClockSpeed);                                    // For DriverServicesLib patch
        WriteMacInt16(XLM_EXEC_RETURN_OPCODE, M68K_EXEC_RETURN);                // For Execute68k() (RTS from the executed 68k code will jump here and end 68k mode)
        WriteMacInt32(XLM_ZERO_PAGE, SheepMem::ZeroPage());                             // Pointer to read-only page with all bits set to 0
        WriteMacInt32(XLM_ETHER_INIT, NativeFunction(NATIVE_ETHER_INIT));       // DLPI ethernet driver functions
        WriteMacInt32(XLM_ETHER_TERM, NativeFunction(NATIVE_ETHER_TERM));
        WriteMacInt32(XLM_ETHER_OPEN, NativeFunction(NATIVE_ETHER_OPEN));
        WriteMacInt32(XLM_ETHER_CLOSE, NativeFunction(NATIVE_ETHER_CLOSE));
        WriteMacInt32(XLM_ETHER_WPUT, NativeFunction(NATIVE_ETHER_WPUT));
        WriteMacInt32(XLM_ETHER_RSRV, NativeFunction(NATIVE_ETHER_RSRV));
        WriteMacInt32(XLM_VIDEO_DOIO, NativeFunction(NATIVE_VIDEO_DO_DRIVER_IO));
        D(bug("Low Memory initialized\n"));

        // Start 60Hz thread
        tick_thread_cancel = false;
        tick_thread_active = ((tick_thread = create_thread(tick_func)) != NULL);
        SetThreadPriority(tick_thread, THREAD_PRIORITY_ABOVE_NORMAL);
        D(bug("Tick thread installed (%ld)\n", tick_thread));

        // Start NVRAM watchdog thread
        memcpy(last_xpram, XPRAM, XPRAM_SIZE);
        nvram_thread_cancel = false;
        nvram_thread_active = ((nvram_thread = create_thread(nvram_func, NULL)) != NULL);
        SetThreadPriority(nvram_thread, THREAD_PRIORITY_BELOW_NORMAL);
        D(bug("NVRAM thread installed (%ld)\n", nvram_thread));

        // Get my thread ID and jump to ROM boot routine
        emul_thread = GetCurrentThread();
        D(bug("Jumping to ROM\n"));
        jump_to_rom(ROM_BASE + 0x310000);
        D(bug("Returned from ROM\n"));

quit:
        Quit();
        return 0;
}


/*
 *  Cleanup and quit
 */

static void Quit(void)
{
        // Exit PowerPC emulation
        exit_emul_ppc();

        // Stop 60Hz thread
        if (tick_thread_active) {
                tick_thread_cancel = true;
                wait_thread(tick_thread);
        }

        // Stop NVRAM watchdog thread
        if (nvram_thread_active) {
                nvram_thread_cancel = true;
                wait_thread(nvram_thread);
        }

        // Save NVRAM
        XPRAMExit();

        // Exit clipboard
        ClipExit();

        // Exit Time Manager
        TimerExit();

        // Exit serial
        SerialExit();

        // Exit network
        EtherExit();

        // Exit audio
        AudioExit();

        // Exit ADB
        ADBExit();

        // Exit video
        VideoExit();

        // Exit external file system
        ExtFSExit();

        // Exit drivers
        SCSIExit();
        CDROMExit();
        DiskExit();
        SonyExit();

        // Delete thunks
        ThunksExit();

        // Delete SheepShaver globals
        SheepMem::Exit();

        // Delete RAM area
        if (ram_area_mapped)
                vm_mac_release(RAM_BASE, RAMSize);

        // Delete ROM area
        if (rom_area_mapped)
                vm_mac_release(ROM_BASE, ROM_AREA_SIZE);

        // Delete DR cache areas
        if (dr_emulator_area_mapped)
                vm_mac_release(DR_EMULATOR_BASE, DR_EMULATOR_SIZE);
        if (dr_cache_area_mapped)
                vm_mac_release(DR_CACHE_BASE, DR_CACHE_SIZE);

        // Delete Kernel Data area
        kernel_data_exit();

        // Delete Low Memory area
        if (lm_area_mapped)
                vm_mac_release(0, 0x3000);

        // Exit system routines
        SysExit();

        // Exit preferences
        PrefsExit();

#ifdef ENABLE_MON
        // Exit mon
        mon_exit();
#endif

        exit(0);
}


/*
 *  Initialize Kernel Data segments
 */

static HANDLE kernel_handle;                            // Shared memory handle for Kernel Data
static DWORD allocation_granule;                        // Minimum size of allocateable are (64K)
static DWORD kernel_area_size;                          // Size of Kernel Data area

static bool kernel_data_init(void)
{
        char str[256];
        SYSTEM_INFO si;
        GetSystemInfo(&si);
        allocation_granule = si.dwAllocationGranularity;
        kernel_area_size = (KERNEL_AREA_SIZE + allocation_granule - 1) & -allocation_granule;

        char rcs[10];
        LPVOID kernel_addr;
        kernel_handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, kernel_area_size, NULL);
        if (kernel_handle == NULL) {
                sprintf(rcs, "%d", GetLastError());
                sprintf(str, GetString(STR_KD_SHMGET_ERR), rcs);
                ErrorAlert(str);
                return false;
        }
        kernel_addr = (LPVOID)Mac2HostAddr(KERNEL_DATA_BASE & -allocation_granule);
        if (MapViewOfFileEx(kernel_handle, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, kernel_area_size, kernel_addr) != kernel_addr) {
                sprintf(rcs, "%d", GetLastError());
                sprintf(str, GetString(STR_KD_SHMAT_ERR), rcs);
                ErrorAlert(str);
                return false;
        }
        kernel_addr = (LPVOID)Mac2HostAddr(KERNEL_DATA2_BASE & -allocation_granule);
        if (MapViewOfFileEx(kernel_handle, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, kernel_area_size, kernel_addr) != kernel_addr) {
                sprintf(rcs, "%d", GetLastError());
                sprintf(str, GetString(STR_KD2_SHMAT_ERR), rcs);
                ErrorAlert(str);
                return false;
        }
        return true;
}


/*
 *  Deallocate Kernel Data segments
 */

static void kernel_data_exit(void)
{
        if (kernel_handle) {
                UnmapViewOfFile(Mac2HostAddr(KERNEL_DATA_BASE & -allocation_granule));
                UnmapViewOfFile(Mac2HostAddr(KERNEL_DATA2_BASE & -allocation_granule));
                CloseHandle(kernel_handle);
        }
}


/*
 *  Jump into Mac ROM, start 680x0 emulator
 */

void jump_to_rom(uint32 entry)
{
        init_emul_ppc();
        emul_ppc(entry);
}


/*
 *  Quit emulator (cause return from jump_to_rom)
 */

void QuitEmulator(void)
{
        Quit();
}


/*
 *  Pause/resume emulator
 */

void PauseEmulator(void)
{
        SuspendThread(emul_thread);
}

void ResumeEmulator(void)
{
        ResumeThread(emul_thread);
}


/*
 *  Dump 68k registers
 */

void Dump68kRegs(M68kRegisters *r)
{
        // Display 68k registers
        for (int i=0; i<8; i++) {
                printf("d%d: %08x", i, r->d[i]);
                if (i == 3 || i == 7)
                        printf("\n");
                else
                        printf(", ");
        }
        for (int i=0; i<8; i++) {
                printf("a%d: %08x", i, r->a[i]);
                if (i == 3 || i == 7)
                        printf("\n");
                else
                        printf(", ");
        }
}


/*
 *  Make code executable
 */

void MakeExecutable(int dummy, uint32 start, uint32 length)
{
        if ((start >= ROM_BASE) && (start < (ROM_BASE + ROM_SIZE)))
                return;
        FlushCodeCache(start, start + length);
}


/*
 *  Patch things after system startup (gets called by disk driver accRun routine)
 */

void PatchAfterStartup(void)
{
        ExecuteNative(NATIVE_VIDEO_INSTALL_ACCEL);
        InstallExtFS();
}


/*
 *  NVRAM watchdog thread (saves NVRAM every minute)
 */

static void nvram_watchdog(void)
{
        if (memcmp(last_xpram, XPRAM, XPRAM_SIZE)) {
                memcpy(last_xpram, XPRAM, XPRAM_SIZE);
                SaveXPRAM();
        }
}

static DWORD nvram_func(void *arg)
{
        while (!nvram_thread_cancel) {
                for (int i=0; i<60 && !nvram_thread_cancel; i++)
                        Delay_usec(999999);             // Only wait 1 second so we quit promptly when nvram_thread_cancel becomes true
                nvram_watchdog();
        }
        return 0;
}


/*
 *  60Hz thread (really 60.15Hz)
 */

static DWORD tick_func(void *arg)
{
        int tick_counter = 0;
        uint64 start = GetTicks_usec();
        int64 ticks = 0;
        uint64 next = GetTicks_usec();

        while (!tick_thread_cancel) {

                // Wait
                next += 16625;
                int64 delay = next - GetTicks_usec();
                if (delay > 0)
                        Delay_usec(delay);
                else if (delay < -16625)
                        next = GetTicks_usec();
                ticks++;

                // Pseudo Mac 1Hz interrupt, update local time
                if (++tick_counter > 60) {
                        tick_counter = 0;
                        WriteMacInt32(0x20c, TimerDateTime());
                }

                // Trigger 60Hz interrupt
                if (ReadMacInt32(XLM_IRQ_NEST) == 0) {
                        SetInterruptFlag(INTFLAG_VIA);
                        TriggerInterrupt();
                }
        }

        uint64 end = GetTicks_usec();
        D(bug("%Ld ticks in %Ld usec = %f ticks/sec\n", ticks, end - start, ticks * 1000000.0 / (end - start)));
        return 0;
}


/*
 *  Mutexes
 */

struct B2_mutex {
        mutex_t m;
};

B2_mutex *B2_create_mutex(void)
{
        return new B2_mutex;
}

void B2_lock_mutex(B2_mutex *mutex)
{
        mutex->m.lock();
}

void B2_unlock_mutex(B2_mutex *mutex)
{
        mutex->m.unlock();
}

void B2_delete_mutex(B2_mutex *mutex)
{
        delete mutex;
}


/*
 *  Interrupt flags (must be handled atomically!)
 */

volatile uint32 InterruptFlags = 0;
static mutex_t intflags_mutex;

void SetInterruptFlag(uint32 flag)
{
        intflags_mutex.lock();
        InterruptFlags |= flag;
        intflags_mutex.unlock();
}

void ClearInterruptFlag(uint32 flag)
{
        intflags_mutex.lock();
        InterruptFlags &= ~flag;
        intflags_mutex.unlock();
}


/*
 *  Disable interrupts
 */

void DisableInterrupt(void)
{
        WriteMacInt32(XLM_IRQ_NEST, int32(ReadMacInt32(XLM_IRQ_NEST)) + 1);
}


/*
 *  Enable interrupts
 */

void EnableInterrupt(void)
{
        WriteMacInt32(XLM_IRQ_NEST, int32(ReadMacInt32(XLM_IRQ_NEST)) - 1);
}


/*
 *  Helpers to share 32-bit addressable data with MacOS
 */

bool SheepMem::Init(void)
{
        // Size of a native page
        page_size = vm_page_size();

        // Allocate SheepShaver globals
        proc = base;
        if (vm_mac_acquire(base, size) < 0)
                return false;

        // Allocate page with all bits set to 0, right in the middle
        // This is also used to catch undesired overlaps between proc and data areas
        zero_page = proc + (size / 2);
        Mac_memset(zero_page, 0, page_size);
        if (vm_protect(Mac2HostAddr(zero_page), page_size, VM_PAGE_READ) < 0)
                return false;

        // Allocate alternate stack for PowerPC interrupt routine
        sig_stack = base + size;
        if (vm_mac_acquire(sig_stack, SIG_STACK_SIZE) < 0)
                return false;

        data = base + size;
        return true;
}

void SheepMem::Exit(void)
{
        if (data) {
                // Delete SheepShaver globals
                vm_mac_release(base, size);

                // Delete alternate stack for PowerPC interrupt routine
                vm_mac_release(sig_stack, SIG_STACK_SIZE);
        }
}


/*
 *  Get the main window handle
 */

#ifdef USE_SDL_VIDEO
#include <SDL_syswm.h>
static HWND GetMainWindowHandle(void)
{
        SDL_SysWMinfo wmInfo;
        wmInfo.version.major = SDL_MAJOR_VERSION;
        wmInfo.version.minor = SDL_MINOR_VERSION;
        wmInfo.version.patch = SDL_PATCHLEVEL;
        return SDL_GetWMInfo(&wmInfo) ? wmInfo.window : NULL;
}
#endif


/*
 *  Display alert
 */

static void display_alert(int title_id, const char *text, int flags)
{
        HWND hMainWnd = GetMainWindowHandle();
        MessageBox(hMainWnd, text, GetString(title_id), MB_OK | flags);
}


/*
 *  Display error alert
 */

void ErrorAlert(const char *text)
{
        if (PrefsFindBool("nogui"))
                return;

        VideoQuitFullScreen();
        display_alert(STR_ERROR_ALERT_TITLE, text, MB_ICONSTOP);
}


/*
 *  Display warning alert
 */

void WarningAlert(const char *text)
{
        if (PrefsFindBool("nogui"))
                return;

        display_alert(STR_WARNING_ALERT_TITLE, text, MB_ICONINFORMATION);
}


/*
 *  Display choice alert
 */

bool ChoiceAlert(const char *text, const char *pos, const char *neg)
{
        printf(GetString(STR_SHELL_WARNING_PREFIX), text);
        return false;   //!!
}
Revision:	1.4
Committed:	2004-12-11T10:17:48Z (19 years, 11 months ago) by gbeauche
Branch:	MAIN
Changes since 1.3:	+10 -49 lines
Log Message:	use native windows critical sections to implement atomic interrupt flags handling and B2_mutexes