diff options
Diffstat (limited to 'src/device/oprom/yabel/biosemu.c')
| -rw-r--r-- | src/device/oprom/yabel/biosemu.c | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/src/device/oprom/yabel/biosemu.c b/src/device/oprom/yabel/biosemu.c new file mode 100644 index 0000000000..2a2ca312cb --- /dev/null +++ b/src/device/oprom/yabel/biosemu.c @@ -0,0 +1,395 @@ +/****************************************************************************** + * Copyright (c) 2004, 2008 IBM Corporation + * Copyright (c) 2008, 2009 Pattrick Hueper <phueper@hueper.net> + * Copyright (c) 2010 coresystems GmbH + * 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 <string.h> +#include <types.h> + +#include "debug.h" + +#include <x86emu/x86emu.h> +#include <x86emu/regs.h> +#include "../x86emu/prim_ops.h" + +#include "biosemu.h" +#include "io.h" +#include "mem.h" +#include "interrupt.h" +#include "device.h" +#include "pmm.h" + +#include <device/device.h> +#include "compat/rtas.h" + +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]; + +void +mainboard_interrupt_handlers(int interrupt, yabel_handleIntFunc func) +{ + yabel_intFuncArray[interrupt] = func; +} + +/* 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; +#if CONFIG_X86EMU_DEBUG + debug_flags = 0; +#if CONFIG_X86EMU_DEBUG_JMP + debug_flags |= DEBUG_JMP; +#endif +#if CONFIG_X86EMU_DEBUG_TRACE + debug_flags |= DEBUG_TRACE_X86EMU; +#endif +#if CONFIG_X86EMU_DEBUG_PNP + debug_flags |= DEBUG_PNP; +#endif +#if CONFIG_X86EMU_DEBUG_DISK + debug_flags |= DEBUG_DISK; +#endif +#if CONFIG_X86EMU_DEBUG_PMM + debug_flags |= DEBUG_PMM; +#endif +#if CONFIG_X86EMU_DEBUG_VBE + debug_flags |= DEBUG_VBE; +#endif +#if CONFIG_X86EMU_DEBUG_INT10 + debug_flags |= DEBUG_PRINT_INT10; +#endif +#if CONFIG_X86EMU_DEBUG_INTERRUPTS + debug_flags |= DEBUG_INTR; +#endif +#if CONFIG_X86EMU_DEBUG_CHECK_VMEM_ACCESS + debug_flags |= DEBUG_CHECK_VMEM_ACCESS; +#endif +#if CONFIG_X86EMU_DEBUG_MEM + debug_flags |= DEBUG_MEM; +#endif +#if CONFIG_X86EMU_DEBUG_IO + debug_flags |= DEBUG_IO; +#endif + +#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; + } + biosemu_add_special_memory(0, 0x500); // IVT + BDA + biosemu_add_special_memory(OPTION_ROM_CODE_SEGMENT << 4, 0x10000); // option ROM + + 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) + // But we have to be careful: If biosmem is 0x00000000 we're running + // in the lower 1MB and we must not wipe memory like that. + if (biosmem) { + DEBUG_PRINTF("Clearing biosmem\n"); + memset(biosmem, 0xf4, biosmem_size); + } + + X86EMU_setMemBase(biosmem, 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 = (u8*)(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(); + my_wrb((u32)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) + const char *date = "06/11/99"; + for (i = 0; date[i]; i++) + my_wrb(0xffff5 + i, date[i]); + // set up eisa ident string + const 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(); +#if 0 + } else { + 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); +#if CONFIG_X86EMU_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 { + 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; +} |