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/* |
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* rom_patches.cpp - ROM patches |
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* |
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< |
* SheepShaver (C) 1997-2002 Christian Bauer and Marc Hellwig |
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* SheepShaver (C) 1997-2004 Christian Bauer and Marc Hellwig |
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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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const uint32 CHECK_LOAD_PATCH_SPACE = 0x2fcf00; |
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const uint32 PUT_SCRAP_PATCH_SPACE = 0x2fcf80; |
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const uint32 GET_SCRAP_PATCH_SPACE = 0x2fcfc0; |
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const uint32 ADDR_MAP_PATCH_SPACE = 0x2fd000; |
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const uint32 ADDR_MAP_PATCH_SPACE = 0x2fd100; |
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// Global variables |
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int ROMType; // ROM type |
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/* |
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* Check that requested ROM patch space is really available |
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*/ |
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|
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static bool check_rom_patch_space(uint32 base, uint32 size) |
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{ |
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size = (size + 3) & -4; |
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for (int i = 0; i < size; i += 4) { |
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uint32 x = ntohl(*(uint32 *)(ROM_BASE + base + i)); |
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if (x != 0x6b636b63 && x != 0) |
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return false; |
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} |
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return true; |
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} |
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|
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/* |
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* List of audio sifters installed in ROM and System file |
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*/ |
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return false; |
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// Check that other ROM addresses point to really free regions |
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if (ntohl(*(uint32 *)(ROM_BASE + CHECK_LOAD_PATCH_SPACE)) != 0x6b636b63) |
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if (!check_rom_patch_space(CHECK_LOAD_PATCH_SPACE, 0x40)) |
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return false; |
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if (ntohl(*(uint32 *)(ROM_BASE + PUT_SCRAP_PATCH_SPACE)) != 0x6b636b63) |
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if (!check_rom_patch_space(PUT_SCRAP_PATCH_SPACE, 0x40)) |
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return false; |
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if (ntohl(*(uint32 *)(ROM_BASE + GET_SCRAP_PATCH_SPACE)) != 0x6b636b63) |
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if (!check_rom_patch_space(GET_SCRAP_PATCH_SPACE, 0x40)) |
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return false; |
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if (ntohl(*(uint32 *)(ROM_BASE + ADDR_MAP_PATCH_SPACE)) != 0x6b636b63) |
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if (!check_rom_patch_space(ADDR_MAP_PATCH_SPACE - 10 * 4, 0x100)) |
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return false; |
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// Apply patches |
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lp[8] = htonl(0x00800002); // TLB total size/TLB assoc |
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break; |
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// case 11: // X704? |
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case 12: // ??? |
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case 12: // 7400, 7410 |
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case 0x800c: |
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lp[0] = htonl(0x1000); // Page size |
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lp[1] = htonl(0x8000); // Data cache size |
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lp[2] = htonl(0x8000); // Inst cache size |
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static bool patch_68k_emul(void) |
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{ |
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uint32 *lp; |
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uint32 base; |
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uint32 base, loc; |
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// Overwrite twi instructions |
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static const uint8 twi_dat[] = {0x0f, 0xff, 0x00, 0x00, 0x0f, 0xff, 0x00, 0x01, 0x0f, 0xff, 0x00, 0x02}; |
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return false; |
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dr_found: |
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lp++; |
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*lp = htonl(0x48000000 + 0xf000 - (((uint32)lp - ROM_BASE) & 0xffff)); // b DR_CACHE_BASE+0x1f000 |
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lp = (uint32 *)(ROM_BASE + 0x37f000); |
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*lp++ = htonl(0x3c000000 + ((ROM_BASE + 0x46d0a4) >> 16)); // lis r0,xxx |
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*lp++ = htonl(0x60000000 + ((ROM_BASE + 0x46d0a4) & 0xffff)); // ori r0,r0,xxx |
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*lp++ = htonl(0x7c0903a6); // mtctr r0 |
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*lp = htonl(POWERPC_BCTR); // bctr |
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loc = (uint32)lp - ROM_BASE; |
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if ((base = powerpc_branch_target(ROM_BASE + loc)) == 0) base = ROM_BASE + loc; |
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static const uint8 dr_ret_dat[] = {0x80, 0xbf, 0x08, 0x14, 0x53, 0x19, 0x4d, 0xac, 0x7c, 0xa8, 0x03, 0xa6}; |
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if ((base = find_rom_data(base - ROM_BASE, 0x380000, dr_ret_dat, sizeof(dr_ret_dat))) == 0) return false; |
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D(bug("dr_ret %08lx\n", base)); |
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if (base != loc) { |
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// OldWorld ROMs contain an absolute branch |
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D(bug(" patching absolute branch at %08x\n", (uint32)lp - ROM_BASE)); |
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*lp = htonl(0x48000000 + 0xf000 - (((uint32)lp - ROM_BASE) & 0xffff)); // b DR_CACHE_BASE+0x1f000 |
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lp = (uint32 *)(ROM_BASE + 0x37f000); |
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*lp++ = htonl(0x3c000000 + ((ROM_BASE + base) >> 16)); // lis r0,xxx |
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*lp++ = htonl(0x60000000 + ((ROM_BASE + base) & 0xffff)); // ori r0,r0,xxx |
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*lp++ = htonl(0x7c0803a6); // mtlr r0 |
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*lp = htonl(POWERPC_BLR); // blr |
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} |
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return true; |
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} |
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D(bug("scc_init_caller %08lx\n", base + 12)); |
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wp = (uint16 *)(ROM_BASE + base + 12); |
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loc = ntohs(wp[1]) + ((uintptr)wp - ROM_BASE) + 2; |
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static const uint8 scc_init_dat[] = {0x08, 0x38, 0x00, 0x03, 0x0d, 0xd3, 0x67, 0x12, 0x20, 0x78, 0x01, 0xdc, 0x22, 0x78, 0x01, 0xd8}; |
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if ((base = find_rom_data(loc, loc + 0x80, scc_init_dat, sizeof(scc_init_dat))) != loc) return false; |
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static const uint8 scc_init_dat[] = {0x20, 0x78, 0x01, 0xdc, 0x22, 0x78, 0x01, 0xd8}; |
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if ((base = find_rom_data(loc, loc + 0x80, scc_init_dat, sizeof(scc_init_dat))) == 0) return false; |
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D(bug("scc_init %08lx\n", base)); |
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wp = (uint16 *)(ROM_BASE + base); |
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*wp++ = htons(M68K_EMUL_OP_RESET); |
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lp = (uint32 *)(ROM_BASE + ntohl(*lp)); |
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lp[0xa9fd & 0x3ff] = htonl(GET_SCRAP_PATCH_SPACE); |
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– |
#if __BEOS__ |
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// Patch SynchIdleTime() |
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if (PrefsFindBool("idlewait")) { |
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wp = (uint16 *)(ROM_BASE + find_rom_trap(0xabf7) + 4); // SynchIdleTime() |
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D(bug("SynchIdleTime at %08lx\n", wp)); |
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if (ntohs(*wp) == 0x2078) { |
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if (ntohs(*wp) == 0x2078) { // movea.l ExpandMem,a0 |
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*wp++ = htons(M68K_EMUL_OP_IDLE_TIME); |
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*wp = htons(M68K_NOP); |
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} else { |
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} |
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else if (ntohs(*wp) == 0x70fe) // moveq #-2,d0 |
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*wp++ = htons(M68K_EMUL_OP_IDLE_TIME_2); |
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else { |
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D(bug("SynchIdleTime patch not installed\n")); |
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} |
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} |
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– |
#endif |
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// Construct list of all sifters used by sound components in ROM |
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D(bug("Searching for sound components with type sdev in ROM\n")); |
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WriteMacInt16(dce + dCtlFlags, SonyDriverFlags); |
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} |
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#if DISABLE_SCSI && 0 |
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#if DISABLE_SCSI && HAVE_SIGSEGV_SKIP_INSTRUCTION |
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// Fake SCSIGlobals |
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WriteMacInt32(0xc0c, SheepMem::ZeroPage()); |
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#endif |
