/****************************************************************************** * Copyright (c) 2004, 2008 IBM Corporation * Copyright (c) 2008, 2009 Pattrick Hueper * All rights reserved. * This program and the accompanying materials * are made available under the terms of the BSD License * which accompanies this distribution, and is available at * http://www.opensource.org/licenses/bsd-license.php * * Contributors: * IBM Corporation - initial implementation *****************************************************************************/ #include #include #include "debug.h" #include #include #include "../x86emu/prim_ops.h" #include "biosemu.h" #include "io.h" #include "mem.h" #include "interrupt.h" #include "device.h" #include "pmm.h" #include "compat/rtas.h" #include static X86EMU_memFuncs my_mem_funcs = { my_rdb, my_rdw, my_rdl, my_wrb, my_wrw, my_wrl }; static X86EMU_pioFuncs my_pio_funcs = { my_inb, my_inw, my_inl, my_outb, my_outw, my_outl }; /* interrupt function override array (see biosemu.h) */ yabel_handleIntFunc yabel_intFuncArray[256]; /* main entry into YABEL biosemu, arguments are: * *biosmem = pointer to virtual memory * biosmem_size = size of the virtual memory * *dev = pointer to the device to be initialised * rom_addr = address of the OptionROM to be executed, if this is = 0, YABEL * will look for an ExpansionROM BAR and use the code from there. */ u32 biosemu(u8 *biosmem, u32 biosmem_size, struct device * dev, unsigned long rom_addr) { u8 *rom_image; int i = 0; #ifdef CONFIG_DEBUG debug_flags = 0;//DEBUG_PRINT_INT10 | DEBUG_PNP | DEBUG_INTR | DEBUG_CHECK_VMEM_ACCESS | DEBUG_MEM | DEBUG_IO; // | DEBUG_CHECK_VMEM_ACCESS | DEBUG_MEM | DEBUG_IO; // | DEBUG_TRACE_X86EMU | DEBUG_JMP; /* use CONFIG_YABEL_DEBUG_FLAGS, too... */ debug_flags |= CONFIG_YABEL_DEBUG_FLAGS; #endif if (biosmem_size < MIN_REQUIRED_VMEM_SIZE) { printf("Error: Not enough virtual memory: %x, required: %x!\n", biosmem_size, MIN_REQUIRED_VMEM_SIZE); return -1; } if (biosemu_dev_init(dev) != 0) { printf("Error initializing device!\n"); return -1; } if (biosemu_dev_check_exprom(rom_addr) != 0) { printf("Error: Device Expansion ROM invalid!\n"); return -1; } rom_image = (u8 *) bios_device.img_addr; DEBUG_PRINTF("executing rom_image from %p\n", rom_image); DEBUG_PRINTF("biosmem at %p\n", biosmem); DEBUG_PRINTF("Image Size: %d\n", bios_device.img_size); // in case we jump somewhere unexpected, or execution is finished, // fill the biosmem with hlt instructions (0xf4) memset(biosmem, 0xf4, biosmem_size); M.mem_base = (long) biosmem; M.mem_size = biosmem_size; DEBUG_PRINTF("membase set: %08x, size: %08x\n", (int) M.mem_base, (int) M.mem_size); // copy expansion ROM image to segment OPTION_ROM_CODE_SEGMENT // NOTE: this sometimes fails, some bytes are 0x00... so we compare // after copying and do some retries... u8 *mem_img = biosmem + (OPTION_ROM_CODE_SEGMENT << 4); u8 copy_count = 0; u8 cmp_result = 0; do { #if 0 set_ci(); memcpy(mem_img, rom_image, len); clr_ci(); #else // memcpy fails... try copy byte-by-byte with set/clr_ci u8 c; for (i = 0; i < bios_device.img_size; i++) { set_ci(); c = *(rom_image + i); if (c != *(rom_image + i)) { clr_ci(); printf("Copy failed at: %x/%x\n", i, bios_device.img_size); printf("rom_image(%x): %x, mem_img(%x): %x\n", i, *(rom_image + i), i, *(mem_img + i)); break; } clr_ci(); *(mem_img + i) = c; } #endif copy_count++; set_ci(); cmp_result = memcmp(mem_img, rom_image, bios_device.img_size); clr_ci(); } while ((copy_count < 5) && (cmp_result != 0)); if (cmp_result != 0) { printf ("\nCopying Expansion ROM Image to Memory failed after %d retries! (%x)\n", copy_count, cmp_result); dump(rom_image, 0x20); dump(mem_img, 0x20); return 0; } // setup default Interrupt Vectors // some expansion ROMs seem to check for these addresses.. // each handler is only an IRET (0xCF) instruction // ROM BIOS Int 10 Handler F000:F065 my_wrl(0x10 * 4, 0xf000f065); my_wrb(0x000ff065, 0xcf); // ROM BIOS Int 11 Handler F000:F84D my_wrl(0x11 * 4, 0xf000f84d); my_wrb(0x000ff84d, 0xcf); // ROM BIOS Int 12 Handler F000:F841 my_wrl(0x12 * 4, 0xf000f841); my_wrb(0x000ff841, 0xcf); // ROM BIOS Int 13 Handler F000:EC59 my_wrl(0x13 * 4, 0xf000ec59); my_wrb(0x000fec59, 0xcf); // ROM BIOS Int 14 Handler F000:E739 my_wrl(0x14 * 4, 0xf000e739); my_wrb(0x000fe739, 0xcf); // ROM BIOS Int 15 Handler F000:F859 my_wrl(0x15 * 4, 0xf000f859); my_wrb(0x000ff859, 0xcf); // ROM BIOS Int 16 Handler F000:E82E my_wrl(0x16 * 4, 0xf000e82e); my_wrb(0x000fe82e, 0xcf); // ROM BIOS Int 17 Handler F000:EFD2 my_wrl(0x17 * 4, 0xf000efd2); my_wrb(0x000fefd2, 0xcf); // ROM BIOS Int 1A Handler F000:FE6E my_wrl(0x1a * 4, 0xf000fe6e); my_wrb(0x000ffe6e, 0xcf); // setup BIOS Data Area (0000:04xx, or 0040:00xx) // we currently 0 this area, meaning "we dont have // any hardware" :-) no serial/parallel ports, floppys, ... memset(biosmem + 0x400, 0x0, 0x100); // at offset 13h in BDA is the memory size in kbytes my_wrw(0x413, biosmem_size / 1024); // at offset 0eh in BDA is the segment of the Extended BIOS Data Area // see setup further down my_wrw(0x40e, INITIAL_EBDA_SEGMENT); // TODO: setup BDA Video Data ( offset 49h-66h) // e.g. to store video mode, cursor position, ... // in int10 (done) handler and VBE Functions // TODO: setup BDA Fixed Disk Data // 74h: Fixed Disk Last Operation Status // 75h: Fixed Disk Number of Disk Drives // TODO: check BDA for further needed data... //setup Extended BIOS Data Area //we currently 0 this area memset(biosmem + (INITIAL_EBDA_SEGMENT << 4), 0, INITIAL_EBDA_SIZE); // at offset 0h in EBDA is the size of the EBDA in KB my_wrw((INITIAL_EBDA_SEGMENT << 4) + 0x0, INITIAL_EBDA_SIZE / 1024); //TODO: check for further needed EBDA data... // setup original ROM BIOS Area (F000:xxxx) char *date = "06/11/99"; for (i = 0; date[i]; i++) my_wrb(0xffff5 + i, date[i]); // set up eisa ident string char *ident = "PCI_ISA"; for (i = 0; ident[i]; i++) my_wrb(0xfffd9 + i, ident[i]); // write system model id for IBM-AT // according to "Ralf Browns Interrupt List" Int15 AH=C0 Table 515, // model FC is the original AT and also used in all DOSEMU Versions. my_wrb(0xFFFFE, 0xfc); //setup interrupt handler X86EMU_intrFuncs intrFuncs[256]; for (i = 0; i < 256; i++) intrFuncs[i] = handleInterrupt; X86EMU_setupIntrFuncs(intrFuncs); X86EMU_setupPioFuncs(&my_pio_funcs); X86EMU_setupMemFuncs(&my_mem_funcs); //setup PMM struct in BIOS_DATA_SEGMENT, offset 0x0 u8 pmm_length = pmm_setup(BIOS_DATA_SEGMENT, 0x0); if (pmm_length <= 0) { printf ("\nYABEL: Warning: PMM Area could not be setup. PMM not available (%x)\n", pmm_length); return 0; } else { CHECK_DBG(DEBUG_PMM) { /* test the PMM */ pmm_test(); /* and clean it again by calling pmm_setup... */ pmm_length = pmm_setup(BIOS_DATA_SEGMENT, 0x0); } } // setup the CPU M.x86.R_AH = bios_device.bus; M.x86.R_AL = bios_device.devfn; M.x86.R_DX = 0x80; M.x86.R_EIP = 3; M.x86.R_CS = OPTION_ROM_CODE_SEGMENT; // Initialize stack and data segment M.x86.R_SS = STACK_SEGMENT; M.x86.R_SP = STACK_START_OFFSET; M.x86.R_DS = DATA_SEGMENT; // push a HLT instruction and a pointer to it onto the stack // any return will pop the pointer and jump to the HLT, thus // exiting (more or less) cleanly push_word(0xf4f4); //F4=HLT push_word(M.x86.R_SS); push_word(M.x86.R_SP + 2); CHECK_DBG(DEBUG_TRACE_X86EMU) { X86EMU_trace_on(); } else { #ifdef CONFIG_DEBUG M.x86.debug |= DEBUG_SAVE_IP_CS_F; M.x86.debug |= DEBUG_DECODE_F; M.x86.debug |= DEBUG_DECODE_NOPRINT_F; #endif } CHECK_DBG(DEBUG_JMP) { M.x86.debug |= DEBUG_TRACEJMP_F; M.x86.debug |= DEBUG_TRACEJMP_REGS_F; M.x86.debug |= DEBUG_TRACECALL_F; M.x86.debug |= DEBUG_TRACECALL_REGS_F; } DEBUG_PRINTF("Executing Initialization Vector...\n"); X86EMU_exec(); DEBUG_PRINTF("done\n"); /* According to the PNP BIOS Spec, Option ROMs should upon exit, return * some boot device status in AX (see PNP BIOS Spec Section 3.3 */ DEBUG_PRINTF_CS_IP("Option ROM Exit Status: %04x\n", M.x86.R_AX); #ifdef CONFIG_DEBUG DEBUG_PRINTF("Exit Status Decode:\n"); if (M.x86.R_AX & 0x100) { // bit 8 DEBUG_PRINTF (" IPL Device supporting INT 13h Block Device Format:\n"); switch (((M.x86.R_AX >> 4) & 0x3)) { // bits 5:4 case 0: DEBUG_PRINTF(" No IPL Device attached\n"); break; case 1: DEBUG_PRINTF(" IPL Device status unknown\n"); break; case 2: DEBUG_PRINTF(" IPL Device attached\n"); break; case 3: DEBUG_PRINTF(" IPL Device status RESERVED!!\n"); break; } } if (M.x86.R_AX & 0x80) { // bit 7 DEBUG_PRINTF (" Output Device supporting INT 10h Character Output:\n"); switch (((M.x86.R_AX >> 4) & 0x3)) { // bits 5:4 case 0: DEBUG_PRINTF(" No Display Device attached\n"); break; case 1: DEBUG_PRINTF(" Display Device status unknown\n"); break; case 2: DEBUG_PRINTF(" Display Device attached\n"); break; case 3: DEBUG_PRINTF(" Display Device status RESERVED!!\n"); break; } } if (M.x86.R_AX & 0x40) { // bit 6 DEBUG_PRINTF (" Input Device supporting INT 9h Character Input:\n"); switch (((M.x86.R_AX >> 4) & 0x3)) { // bits 5:4 case 0: DEBUG_PRINTF(" No Input Device attached\n"); break; case 1: DEBUG_PRINTF(" Input Device status unknown\n"); break; case 2: DEBUG_PRINTF(" Input Device attached\n"); break; case 3: DEBUG_PRINTF(" Input Device status RESERVED!!\n"); break; } } #endif /* Check whether the stack is "clean" i.e. containing the HLT * instruction we pushed before executing and pointing to the original * stack address... indicating that the initialization probably was * successful */ if ((pop_word() == 0xf4f4) && (M.x86.R_SS == STACK_SEGMENT) && (M.x86.R_SP == STACK_START_OFFSET)) { DEBUG_PRINTF("Stack is clean, initialization successfull!\n"); } else { DEBUG_PRINTF ("Stack unclean, initialization probably NOT COMPLETE!!\n"); DEBUG_PRINTF("SS:SP = %04x:%04x, expected: %04x:%04x\n", M.x86.R_SS, M.x86.R_SP, STACK_SEGMENT, STACK_START_OFFSET); } // TODO: according to the BIOS Boot Spec initializations may be ended using INT18h and setting // the status. // We need to implement INT18 accordingly, pseudo code is in specsbbs101.pdf page 30 // (also for Int19) return 0; }