| 1 |
/* |
| 2 |
* sheep_driver.c - Low memory and ROM access driver for SheepShaver and |
| 3 |
* Basilisk II on PowerPC systems |
| 4 |
* |
| 5 |
* SheepShaver (C) 1997-2000 Mar"c Hellwig and Christian Bauer |
| 6 |
* Basilisk II (C) 1997-2000 Christian Bauer |
| 7 |
* |
| 8 |
* This program is free software; you can redistribute it and/or modify |
| 9 |
* it under the terms of the GNU General Public License as published by |
| 10 |
* the Free Software Foundation; either version 2 of the License, or |
| 11 |
* (at your option) any later version. |
| 12 |
* |
| 13 |
* This program is distributed in the hope that it will be useful, |
| 14 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 |
* GNU General Public License for more details. |
| 17 |
* |
| 18 |
* You should have received a copy of the GNU General Public License |
| 19 |
* along with this program; if not, write to the Free Software |
| 20 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 |
*/ |
| 22 |
|
| 23 |
#ifdef __i386__ |
| 24 |
#error The sheep driver only runs on PowerPC machines. |
| 25 |
#endif |
| 26 |
|
| 27 |
#include <drivers/KernelExport.h> |
| 28 |
#include <drivers/Drivers.h> |
| 29 |
#include <stdio.h> |
| 30 |
#include <stdlib.h> |
| 31 |
#include <stdarg.h> |
| 32 |
#include <string.h> |
| 33 |
#include <fcntl.h> |
| 34 |
|
| 35 |
#include "sheep_driver.h" |
| 36 |
|
| 37 |
#define DEBUG 0 |
| 38 |
|
| 39 |
#if DEBUG==1 |
| 40 |
#define bug pprintf |
| 41 |
#elif DEBUG==2 |
| 42 |
#define bug dprintf |
| 43 |
#endif |
| 44 |
|
| 45 |
#if DEBUG |
| 46 |
#define D(x) (x) |
| 47 |
#else |
| 48 |
#define D(x) ; |
| 49 |
#endif |
| 50 |
|
| 51 |
#define PORT_NAME "sheep_driver installed" |
| 52 |
|
| 53 |
|
| 54 |
/* |
| 55 |
* For debugging |
| 56 |
*/ |
| 57 |
|
| 58 |
static int pprintf(const char* format, ...) |
| 59 |
{ |
| 60 |
port_id PortNum; |
| 61 |
int len, ret; |
| 62 |
char Buffer[1024]; |
| 63 |
va_list ap; |
| 64 |
|
| 65 |
if ((PortNum = find_port("PortLogger")) == B_NAME_NOT_FOUND) |
| 66 |
return(PortNum); |
| 67 |
for (len=0; len<1024; len++) |
| 68 |
Buffer[len]='\0'; |
| 69 |
va_start(ap, format); |
| 70 |
vsprintf(Buffer, format, ap); |
| 71 |
ret = write_port(PortNum, 0, Buffer, strlen(Buffer)); |
| 72 |
return ret; |
| 73 |
} |
| 74 |
|
| 75 |
|
| 76 |
/* |
| 77 |
* Page table functions |
| 78 |
*/ |
| 79 |
|
| 80 |
static uint32 *pte_address = 0; |
| 81 |
static uint32 vsid; |
| 82 |
static uint32 table_size; |
| 83 |
|
| 84 |
static status_t map_page(uint32 ea, uint32 ra, uint32 **free_pte, uint32 bits) |
| 85 |
{ |
| 86 |
int i; |
| 87 |
int pte_class; |
| 88 |
uint32 hash1, hash2, api, *pteg1, *pteg2; |
| 89 |
|
| 90 |
D(bug("Trying to map EA %p -> RA %p\n", ea, ra)); |
| 91 |
|
| 92 |
// Find PTEG addresses for given EA |
| 93 |
hash1 = (vsid & 0x7ffff) ^ ((ea >> 12) & 0xffff); |
| 94 |
hash2 = ~hash1 & 0x7ffff; |
| 95 |
api = (ea >> 22) & 0x3f; |
| 96 |
pteg1 = (uint32 *)((uint32)pte_address + ((hash1 << 6) & (table_size - 1))); |
| 97 |
pteg2 = (uint32 *)((uint32)pte_address + ((hash2 << 6) & (table_size - 1))); |
| 98 |
D(bug("PTEG1 at %p, PTEG2 at %p\n", pteg1, pteg2)); |
| 99 |
|
| 100 |
// Search all 8 PTEs of each PTEG |
| 101 |
*free_pte = NULL; |
| 102 |
pte_class = 0; |
| 103 |
for (i=0; i<8; i++) { |
| 104 |
D(bug(" found %08lx %08lx\n", pteg1[i*2], pteg1[i*2+1])); |
| 105 |
if (pteg1[i*2] == (0x80000000 | (vsid << 7) | (pte_class << 6) | api)) { |
| 106 |
*free_pte = pteg1 + i*2; |
| 107 |
D(bug(" existing PTE found (PTEG1)\n")); |
| 108 |
break; |
| 109 |
} else if (!pteg1[i*2]) { |
| 110 |
*free_pte = pteg1 + i*2; |
| 111 |
D(bug(" free PTE found (PTEG1)\n")); |
| 112 |
break; |
| 113 |
} |
| 114 |
} |
| 115 |
if (*free_pte == NULL) { |
| 116 |
pte_class = 1; |
| 117 |
for (i=0; i<8; i++) { |
| 118 |
D(bug(" found %08lx %08lx\n", pteg2[i*2], pteg2[i*2+1])); |
| 119 |
if (pteg2[i*2] == (0x80000000 | (vsid << 7) | (pte_class << 6) | api)) { |
| 120 |
*free_pte = pteg2 + i*2; |
| 121 |
D(bug(" existing PTE found (PTEG2)\n")); |
| 122 |
break; |
| 123 |
} else if (!pteg2[i*2]) { |
| 124 |
*free_pte = pteg2 + i*2; |
| 125 |
D(bug(" free PTE found (PTEG2)\n")); |
| 126 |
break; |
| 127 |
} |
| 128 |
} |
| 129 |
} |
| 130 |
|
| 131 |
// Remap page |
| 132 |
if (*free_pte == NULL) { |
| 133 |
D(bug(" No free PTE found :-(\m")); |
| 134 |
return B_DEVICE_FULL; |
| 135 |
} else { |
| 136 |
(*free_pte)[0] = 0x80000000 | (vsid << 7) | (pte_class << 6) | api; |
| 137 |
(*free_pte)[1] = ra | bits; |
| 138 |
D(bug(" written %08lx %08lx to PTE\n", (*free_pte)[0], (*free_pte)[1])); |
| 139 |
return B_NO_ERROR; |
| 140 |
} |
| 141 |
} |
| 142 |
|
| 143 |
static status_t remap_page(uint32 *free_pte, uint32 ra, uint32 bits) |
| 144 |
{ |
| 145 |
D(bug("Remapping PTE %p -> RA %p\n", free_pte, ra)); |
| 146 |
|
| 147 |
// Remap page |
| 148 |
if (free_pte == NULL) { |
| 149 |
D(bug(" Invalid PTE :-(\n")); |
| 150 |
return B_BAD_ADDRESS; |
| 151 |
} else { |
| 152 |
free_pte[1] = ra | bits; |
| 153 |
D(bug(" written %08lx %08lx to PTE\n", free_pte[0], free_pte[1])); |
| 154 |
return B_NO_ERROR; |
| 155 |
} |
| 156 |
} |
| 157 |
|
| 158 |
|
| 159 |
/* |
| 160 |
* Foward declarations for hook functions |
| 161 |
*/ |
| 162 |
|
| 163 |
static status_t sheep_open(const char *name, uint32 flags, void **cookie); |
| 164 |
static status_t sheep_close(void *cookie); |
| 165 |
static status_t sheep_free(void *cookie); |
| 166 |
static status_t sheep_control(void *cookie, uint32 op, void *data, size_t len); |
| 167 |
static status_t sheep_read(void *cookie, off_t pos, void *data, size_t *len); |
| 168 |
static status_t sheep_write(void *cookie, off_t pos, const void *data, size_t *len); |
| 169 |
|
| 170 |
|
| 171 |
/* |
| 172 |
* Version of our driver |
| 173 |
*/ |
| 174 |
|
| 175 |
int32 api_version = B_CUR_DRIVER_API_VERSION; |
| 176 |
|
| 177 |
|
| 178 |
/* |
| 179 |
* Device_hooks structure - has function pointers to the |
| 180 |
* various entry points for device operations |
| 181 |
*/ |
| 182 |
|
| 183 |
static device_hooks my_device_hooks = { |
| 184 |
&sheep_open, |
| 185 |
&sheep_close, |
| 186 |
&sheep_free, |
| 187 |
&sheep_control, |
| 188 |
&sheep_read, |
| 189 |
&sheep_write, |
| 190 |
NULL, |
| 191 |
NULL, |
| 192 |
NULL, |
| 193 |
NULL |
| 194 |
}; |
| 195 |
|
| 196 |
|
| 197 |
/* |
| 198 |
* List of device names to be returned by publish_devices() |
| 199 |
*/ |
| 200 |
|
| 201 |
static char *device_name_list[] = { |
| 202 |
"sheep", |
| 203 |
0 |
| 204 |
}; |
| 205 |
|
| 206 |
|
| 207 |
/* |
| 208 |
* Init - do nothing |
| 209 |
*/ |
| 210 |
|
| 211 |
status_t init_hardware(void) |
| 212 |
{ |
| 213 |
#if DEBUG==2 |
| 214 |
set_dprintf_enabled(true); |
| 215 |
#endif |
| 216 |
D(bug("init_hardware()\n")); |
| 217 |
return B_NO_ERROR; |
| 218 |
} |
| 219 |
|
| 220 |
status_t init_driver(void) |
| 221 |
{ |
| 222 |
D(bug("init_driver()\n")); |
| 223 |
return B_NO_ERROR; |
| 224 |
} |
| 225 |
|
| 226 |
void uninit_driver(void) |
| 227 |
{ |
| 228 |
D(bug("uninit_driver()\n")); |
| 229 |
} |
| 230 |
|
| 231 |
|
| 232 |
/* |
| 233 |
* publish_devices - return list of device names implemented by this driver |
| 234 |
*/ |
| 235 |
|
| 236 |
const char **publish_devices(void) |
| 237 |
{ |
| 238 |
return device_name_list; |
| 239 |
} |
| 240 |
|
| 241 |
|
| 242 |
/* |
| 243 |
* find_device - return device hooks for a specific device name |
| 244 |
*/ |
| 245 |
|
| 246 |
device_hooks *find_device(const char *name) |
| 247 |
{ |
| 248 |
if (!strcmp(name, device_name_list[0])) |
| 249 |
return &my_device_hooks; |
| 250 |
|
| 251 |
return NULL; |
| 252 |
} |
| 253 |
|
| 254 |
|
| 255 |
/* |
| 256 |
* sheep_open - hook function for the open call. |
| 257 |
*/ |
| 258 |
|
| 259 |
static status_t sheep_open(const char *name, uint32 flags, void **cookie) |
| 260 |
{ |
| 261 |
return B_NO_ERROR; |
| 262 |
} |
| 263 |
|
| 264 |
|
| 265 |
/* |
| 266 |
* sheep_close - hook function for the close call. |
| 267 |
*/ |
| 268 |
|
| 269 |
static status_t sheep_close(void *cookie) |
| 270 |
{ |
| 271 |
return B_NO_ERROR; |
| 272 |
} |
| 273 |
|
| 274 |
|
| 275 |
/* |
| 276 |
* sheep_free - hook function to free the cookie returned |
| 277 |
* by the open hook. Since the open hook did not return |
| 278 |
* a cookie, this is a no-op. |
| 279 |
*/ |
| 280 |
|
| 281 |
static status_t sheep_free(void *cookie) |
| 282 |
{ |
| 283 |
return B_NO_ERROR; |
| 284 |
} |
| 285 |
|
| 286 |
|
| 287 |
/* |
| 288 |
* sheep_control - hook function for the ioctl call |
| 289 |
*/ |
| 290 |
|
| 291 |
static asm void inval_tlb(uint32 ea) |
| 292 |
{ |
| 293 |
isync |
| 294 |
tlbie r3 |
| 295 |
sync |
| 296 |
blr |
| 297 |
} |
| 298 |
|
| 299 |
static asm void tlbsync(void) |
| 300 |
{ |
| 301 |
machine 604 |
| 302 |
tlbsync |
| 303 |
sync |
| 304 |
blr |
| 305 |
} |
| 306 |
|
| 307 |
static status_t sheep_control(void *cookie, uint32 op, void *data, size_t len) |
| 308 |
{ |
| 309 |
static void *block; |
| 310 |
static void *block_aligned; |
| 311 |
physical_entry pe[2]; |
| 312 |
system_info sysinfo; |
| 313 |
area_id id; |
| 314 |
area_info info; |
| 315 |
cpu_status cpu_st; |
| 316 |
status_t res; |
| 317 |
uint32 ra0, ra1; |
| 318 |
uint32 *free_pte_0, *free_pte_1; |
| 319 |
int i; |
| 320 |
|
| 321 |
D(bug("control(%d) data %p, len %08x\n", op, data, len)); |
| 322 |
|
| 323 |
switch (op) { |
| 324 |
case SHEEP_UP: |
| 325 |
|
| 326 |
// Already messed up? Then do nothing now |
| 327 |
if (find_port(PORT_NAME) != B_NAME_NOT_FOUND) |
| 328 |
return B_NO_ERROR; |
| 329 |
|
| 330 |
// Get system info |
| 331 |
get_system_info(&sysinfo); |
| 332 |
|
| 333 |
// Prepare replacement memory |
| 334 |
block = malloc(B_PAGE_SIZE * 3); |
| 335 |
D(bug("3 pages malloc()ed at %p\n", block)); |
| 336 |
block_aligned = (void *)(((uint32)block + B_PAGE_SIZE - 1) & ~(B_PAGE_SIZE-1)); |
| 337 |
D(bug("Address aligned to %p\n", block_aligned)); |
| 338 |
res = lock_memory(block_aligned, B_PAGE_SIZE * 2, 0); |
| 339 |
if (res < 0) |
| 340 |
return res; |
| 341 |
|
| 342 |
// Get memory mapping |
| 343 |
D(bug("Memory locked\n")); |
| 344 |
res = get_memory_map(block_aligned, B_PAGE_SIZE * 2, pe, 2); |
| 345 |
D(bug("get_memory_map returned %d\n", res)); |
| 346 |
if (res != B_NO_ERROR) |
| 347 |
return res; |
| 348 |
|
| 349 |
// Find PTE table area |
| 350 |
id = find_area("pte_table"); |
| 351 |
get_area_info(id, &info); |
| 352 |
pte_address = (uint32 *)info.address; |
| 353 |
D(bug("PTE table seems to be at %p\n", pte_address)); |
| 354 |
table_size = info.size; |
| 355 |
D(bug("PTE table size: %dKB\n", table_size / 1024)); |
| 356 |
|
| 357 |
// Disable interrupts |
| 358 |
cpu_st = disable_interrupts(); |
| 359 |
|
| 360 |
// Find vsid and real addresses of replacement memory |
| 361 |
for (i=0; i<table_size/8; i++) { |
| 362 |
if (((uint32)pe[0].address & 0xfffff000)==(pte_address[i*2+1]&0xfffff000)) { |
| 363 |
D(bug("Found page 0 PtePos %04x V%x VSID %03x H%x API %02x RPN %03x R%1x C%1x WIMG%1x PP%1x \n", |
| 364 |
i << 2, |
| 365 |
((pte_address[i*2]&0x80000000) >> 31),((pte_address[i*2]&0x7fffff80) >> 7), |
| 366 |
((pte_address[i*2]&0x00000040) >> 6),(pte_address[i*2] & 0x3f), |
| 367 |
((pte_address[i*2+1]&0xfffff000) >> 12),((pte_address[i*2+1]&0x00000100) >> 8), |
| 368 |
((pte_address[i*2+1]&0x00000080) >> 7),((pte_address[i*2+1]&0x00000078) >> 3), |
| 369 |
(pte_address[i*2+1]&0x00000003))); |
| 370 |
vsid = (pte_address[i*2]&0x7fffff80) >> 7; |
| 371 |
ra0 = (uint32)pe[0].address & 0xfffff000; |
| 372 |
} |
| 373 |
if ((uint32)pe[0].size == B_PAGE_SIZE) { |
| 374 |
if (((uint32)pe[1].address & 0xfffff000)==(pte_address[i*2+1]&0xfffff000)) { |
| 375 |
D(bug("Found page 1f PtePos %04x V%x VSID %03x H%x API %02x RPN %03x R%1x C%1x WIMG%1x PP%1x \n", |
| 376 |
i << 2, |
| 377 |
((pte_address[i*2]&0x80000000) >> 31), ((pte_address[i*2]&0x7fffff80) >> 7), |
| 378 |
((pte_address[i*2]&0x00000040) >> 6), (pte_address[i*2] & 0x3f), |
| 379 |
((pte_address[i*2+1]&0xfffff000) >> 12), ((pte_address[i*2+1]&0x00000100) >> 8), |
| 380 |
((pte_address[i*2+1]&0x00000080) >> 7), ((pte_address[i*2+1]&0x00000078) >> 3), |
| 381 |
(pte_address[i*2+1]&0x00000003))); |
| 382 |
ra1 = (uint32)pe[1].address & 0xfffff000; |
| 383 |
} |
| 384 |
} else { |
| 385 |
if ((((uint32)pe[0].address + B_PAGE_SIZE) & 0xfffff000)==(pte_address[i*2+1]&0xfffff000)) { |
| 386 |
D(bug("Found page 1d PtePos %04x V%x VSID %03x H%x API %02x RPN %03x R%1x C%1x WIMG%1x PP%1x \n", |
| 387 |
i << 2, |
| 388 |
((pte_address[i*2]&0x80000000) >> 31), ((pte_address[i*2]&0x7fffff80) >> 7), |
| 389 |
((pte_address[i*2]&0x00000040) >> 6), (pte_address[i*2] & 0x3f), |
| 390 |
((pte_address[i*2+1]&0xfffff000) >> 12), ((pte_address[i*2+1]&0x00000100) >> 8), |
| 391 |
((pte_address[i*2+1]&0x00000080) >> 7), ((pte_address[i*2+1]&0x00000078) >> 3), |
| 392 |
(pte_address[i*2+1]&0x00000003))); |
| 393 |
ra1 = ((uint32)pe[0].address + B_PAGE_SIZE) & 0xfffff000; |
| 394 |
} |
| 395 |
} |
| 396 |
} |
| 397 |
|
| 398 |
// Map low memory for emulator |
| 399 |
free_pte_0 = NULL; |
| 400 |
free_pte_1 = NULL; |
| 401 |
__sync(); |
| 402 |
__isync(); |
| 403 |
inval_tlb(0); |
| 404 |
inval_tlb(B_PAGE_SIZE); |
| 405 |
if (sysinfo.cpu_type != B_CPU_PPC_603 && sysinfo.cpu_type != B_CPU_PPC_603e) |
| 406 |
tlbsync(); |
| 407 |
res = map_page(0, ra0, &free_pte_0, 0x12); |
| 408 |
if (res == B_NO_ERROR) |
| 409 |
res = map_page(B_PAGE_SIZE, ra1, &free_pte_1, 0x12); |
| 410 |
inval_tlb(0); |
| 411 |
inval_tlb(B_PAGE_SIZE); |
| 412 |
if (sysinfo.cpu_type != B_CPU_PPC_603 && sysinfo.cpu_type != B_CPU_PPC_603e) |
| 413 |
tlbsync(); |
| 414 |
__sync(); |
| 415 |
__isync(); |
| 416 |
|
| 417 |
// Restore interrupts |
| 418 |
restore_interrupts(cpu_st); |
| 419 |
|
| 420 |
// Create port so we know that messing was successful |
| 421 |
set_port_owner(create_port(1, PORT_NAME), B_SYSTEM_TEAM); |
| 422 |
return B_NO_ERROR; |
| 423 |
|
| 424 |
case SHEEP_DOWN: |
| 425 |
return B_NO_ERROR; |
| 426 |
|
| 427 |
default: |
| 428 |
return B_BAD_VALUE; |
| 429 |
} |
| 430 |
} |
| 431 |
|
| 432 |
|
| 433 |
/* |
| 434 |
* sheep_read - hook function for the read call |
| 435 |
*/ |
| 436 |
|
| 437 |
static status_t sheep_read(void *cookie, off_t pos, void *data, size_t *len) |
| 438 |
{ |
| 439 |
void *rom_adr; |
| 440 |
area_id area; |
| 441 |
system_info info; |
| 442 |
|
| 443 |
D(bug("read() pos %Lx, data %p, len %08x\n", pos, data, *len)); |
| 444 |
|
| 445 |
get_system_info(&info); |
| 446 |
if (info.platform_type == B_BEBOX_PLATFORM) { |
| 447 |
*len = 0; |
| 448 |
return B_ERROR; |
| 449 |
} |
| 450 |
if (*len != 0x400000 && pos != 0) { |
| 451 |
*len = 0; |
| 452 |
return B_BAD_VALUE; |
| 453 |
} |
| 454 |
area = map_physical_memory("mac_rom", (void *)0xff000000, 0x00400000, B_ANY_KERNEL_ADDRESS, B_READ_AREA, &rom_adr); |
| 455 |
D(bug("Mapped ROM to %p, area id %d\n", rom_adr, area)); |
| 456 |
if (area < 0) { |
| 457 |
*len = 0; |
| 458 |
return area; |
| 459 |
} |
| 460 |
D(bug("Copying ROM\n")); |
| 461 |
memcpy(data, rom_adr, *len); |
| 462 |
D(bug("Deleting area\n")); |
| 463 |
delete_area(area); |
| 464 |
return B_NO_ERROR; |
| 465 |
} |
| 466 |
|
| 467 |
|
| 468 |
/* |
| 469 |
* sheep_write - hook function for the write call |
| 470 |
*/ |
| 471 |
|
| 472 |
static status_t sheep_write(void *cookie, off_t pos, const void *data, size_t *len) |
| 473 |
{ |
| 474 |
D(bug("write() pos %Lx, data %p, len %08x\n", pos, data, *len)); |
| 475 |
return B_READ_ONLY_DEVICE; |
| 476 |
} |
