361 lines
11 KiB
C
361 lines
11 KiB
C
/******************************************************************************
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* Copyright (c) 2004, 2008 IBM Corporation
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* Copyright (c) 2008, 2009 Pattrick Hueper <phueper@hueper.net>
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* All rights reserved.
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* This program and the accompanying materials
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* are made available under the terms of the BSD License
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* which accompanies this distribution, and is available at
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* http://www.opensource.org/licenses/bsd-license.php
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*
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* Contributors:
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* IBM Corporation - initial implementation
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*****************************************************************************/
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#include <string.h>
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#include <types.h>
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#include "debug.h"
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#include <x86emu/x86emu.h>
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#include <x86emu/regs.h>
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#include "../x86emu/prim_ops.h"
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#include "biosemu.h"
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#include "io.h"
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#include "mem.h"
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#include "interrupt.h"
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#include "device.h"
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#include "pmm.h"
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#include "compat/rtas.h"
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#include <device/device.h>
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static X86EMU_memFuncs my_mem_funcs = {
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my_rdb, my_rdw, my_rdl,
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my_wrb, my_wrw, my_wrl
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};
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static X86EMU_pioFuncs my_pio_funcs = {
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my_inb, my_inw, my_inl,
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my_outb, my_outw, my_outl
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};
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/* interrupt function override array (see biosemu.h) */
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yabel_handleIntFunc yabel_intFuncArray[256];
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/* main entry into YABEL biosemu, arguments are:
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* *biosmem = pointer to virtual memory
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* biosmem_size = size of the virtual memory
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* *dev = pointer to the device to be initialised
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* rom_addr = address of the OptionROM to be executed, if this is = 0, YABEL
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* will look for an ExpansionROM BAR and use the code from there.
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*/
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u32
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biosemu(u8 *biosmem, u32 biosmem_size, struct device * dev, unsigned long rom_addr)
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{
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u8 *rom_image;
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int i = 0;
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#ifdef DEBUG
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debug_flags = 0;//DEBUG_PRINT_INT10 | DEBUG_PNP | DEBUG_INTR | DEBUG_CHECK_VMEM_ACCESS | DEBUG_MEM | DEBUG_IO;
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// | DEBUG_CHECK_VMEM_ACCESS | DEBUG_MEM | DEBUG_IO;
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// | DEBUG_TRACE_X86EMU | DEBUG_JMP;
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/* use CONFIG_YABEL_DEBUG_FLAGS, too... */
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debug_flags |= CONFIG_YABEL_DEBUG_FLAGS;
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#endif
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if (biosmem_size < MIN_REQUIRED_VMEM_SIZE) {
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printf("Error: Not enough virtual memory: %x, required: %x!\n",
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biosmem_size, MIN_REQUIRED_VMEM_SIZE);
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return -1;
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}
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if (biosemu_dev_init(dev) != 0) {
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printf("Error initializing device!\n");
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return -1;
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}
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if (biosemu_dev_check_exprom(rom_addr) != 0) {
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printf("Error: Device Expansion ROM invalid!\n");
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return -1;
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}
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rom_image = (u8 *) bios_device.img_addr;
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DEBUG_PRINTF("executing rom_image from %p\n", rom_image);
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DEBUG_PRINTF("biosmem at %p\n", biosmem);
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DEBUG_PRINTF("Image Size: %d\n", bios_device.img_size);
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// in case we jump somewhere unexpected, or execution is finished,
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// fill the biosmem with hlt instructions (0xf4)
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// But we have to be careful: If biosmem is 0x00000000 we're running
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// in the lower 1MB and we must not wipe memory like that.
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if (biosmem) {
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DEBUG_PRINTF("Clearing biosmem\n");
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memset(biosmem, 0xf4, biosmem_size);
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}
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X86EMU_setMemBase(biosmem, biosmem_size);
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DEBUG_PRINTF("membase set: %08x, size: %08x\n", (int) M.mem_base,
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(int) M.mem_size);
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// copy expansion ROM image to segment OPTION_ROM_CODE_SEGMENT
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// NOTE: this sometimes fails, some bytes are 0x00... so we compare
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// after copying and do some retries...
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u8 *mem_img = biosmem + (OPTION_ROM_CODE_SEGMENT << 4);
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u8 copy_count = 0;
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u8 cmp_result = 0;
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do {
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#if 0
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set_ci();
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memcpy(mem_img, rom_image, len);
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clr_ci();
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#else
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// memcpy fails... try copy byte-by-byte with set/clr_ci
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u8 c;
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for (i = 0; i < bios_device.img_size; i++) {
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set_ci();
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c = *(rom_image + i);
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if (c != *(rom_image + i)) {
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clr_ci();
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printf("Copy failed at: %x/%x\n", i,
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bios_device.img_size);
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printf("rom_image(%x): %x, mem_img(%x): %x\n",
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i, *(rom_image + i), i, *(mem_img + i));
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break;
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}
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clr_ci();
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*(mem_img + i) = c;
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}
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#endif
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copy_count++;
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set_ci();
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cmp_result = memcmp(mem_img, rom_image, bios_device.img_size);
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clr_ci();
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}
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while ((copy_count < 5) && (cmp_result != 0));
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if (cmp_result != 0) {
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printf
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("\nCopying Expansion ROM Image to Memory failed after %d retries! (%x)\n",
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copy_count, cmp_result);
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dump(rom_image, 0x20);
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dump(mem_img, 0x20);
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return 0;
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}
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// setup default Interrupt Vectors
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// some expansion ROMs seem to check for these addresses..
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// each handler is only an IRET (0xCF) instruction
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// ROM BIOS Int 10 Handler F000:F065
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my_wrl(0x10 * 4, 0xf000f065);
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my_wrb(0x000ff065, 0xcf);
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// ROM BIOS Int 11 Handler F000:F84D
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my_wrl(0x11 * 4, 0xf000f84d);
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my_wrb(0x000ff84d, 0xcf);
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// ROM BIOS Int 12 Handler F000:F841
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my_wrl(0x12 * 4, 0xf000f841);
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my_wrb(0x000ff841, 0xcf);
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// ROM BIOS Int 13 Handler F000:EC59
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my_wrl(0x13 * 4, 0xf000ec59);
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my_wrb(0x000fec59, 0xcf);
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// ROM BIOS Int 14 Handler F000:E739
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my_wrl(0x14 * 4, 0xf000e739);
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my_wrb(0x000fe739, 0xcf);
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// ROM BIOS Int 15 Handler F000:F859
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my_wrl(0x15 * 4, 0xf000f859);
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my_wrb(0x000ff859, 0xcf);
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// ROM BIOS Int 16 Handler F000:E82E
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my_wrl(0x16 * 4, 0xf000e82e);
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my_wrb(0x000fe82e, 0xcf);
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// ROM BIOS Int 17 Handler F000:EFD2
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my_wrl(0x17 * 4, 0xf000efd2);
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my_wrb(0x000fefd2, 0xcf);
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// ROM BIOS Int 1A Handler F000:FE6E
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my_wrl(0x1a * 4, 0xf000fe6e);
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my_wrb(0x000ffe6e, 0xcf);
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// setup BIOS Data Area (0000:04xx, or 0040:00xx)
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// we currently 0 this area, meaning "we dont have
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// any hardware" :-) no serial/parallel ports, floppys, ...
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memset(biosmem + 0x400, 0x0, 0x100);
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// at offset 13h in BDA is the memory size in kbytes
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my_wrw(0x413, biosmem_size / 1024);
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// at offset 0eh in BDA is the segment of the Extended BIOS Data Area
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// see setup further down
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my_wrw(0x40e, INITIAL_EBDA_SEGMENT);
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// TODO: setup BDA Video Data ( offset 49h-66h)
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// e.g. to store video mode, cursor position, ...
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// in int10 (done) handler and VBE Functions
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// TODO: setup BDA Fixed Disk Data
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// 74h: Fixed Disk Last Operation Status
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// 75h: Fixed Disk Number of Disk Drives
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// TODO: check BDA for further needed data...
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//setup Extended BIOS Data Area
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//we currently 0 this area
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memset(biosmem + (INITIAL_EBDA_SEGMENT << 4), 0, INITIAL_EBDA_SIZE);
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// at offset 0h in EBDA is the size of the EBDA in KB
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my_wrw((INITIAL_EBDA_SEGMENT << 4) + 0x0, INITIAL_EBDA_SIZE / 1024);
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//TODO: check for further needed EBDA data...
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// setup original ROM BIOS Area (F000:xxxx)
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char *date = "06/11/99";
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for (i = 0; date[i]; i++)
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my_wrb(0xffff5 + i, date[i]);
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// set up eisa ident string
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char *ident = "PCI_ISA";
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for (i = 0; ident[i]; i++)
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my_wrb(0xfffd9 + i, ident[i]);
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// write system model id for IBM-AT
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// according to "Ralf Browns Interrupt List" Int15 AH=C0 Table 515,
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// model FC is the original AT and also used in all DOSEMU Versions.
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my_wrb(0xFFFFE, 0xfc);
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//setup interrupt handler
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X86EMU_intrFuncs intrFuncs[256];
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for (i = 0; i < 256; i++)
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intrFuncs[i] = handleInterrupt;
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X86EMU_setupIntrFuncs(intrFuncs);
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X86EMU_setupPioFuncs(&my_pio_funcs);
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X86EMU_setupMemFuncs(&my_mem_funcs);
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//setup PMM struct in BIOS_DATA_SEGMENT, offset 0x0
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u8 pmm_length = pmm_setup(BIOS_DATA_SEGMENT, 0x0);
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if (pmm_length <= 0) {
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printf ("\nYABEL: Warning: PMM Area could not be setup. PMM not available (%x)\n",
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pmm_length);
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return 0;
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} else {
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CHECK_DBG(DEBUG_PMM) {
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/* test the PMM */
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pmm_test();
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/* and clean it again by calling pmm_setup... */
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pmm_length = pmm_setup(BIOS_DATA_SEGMENT, 0x0);
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}
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}
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// setup the CPU
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M.x86.R_AH = bios_device.bus;
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M.x86.R_AL = bios_device.devfn;
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M.x86.R_DX = 0x80;
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M.x86.R_EIP = 3;
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M.x86.R_CS = OPTION_ROM_CODE_SEGMENT;
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// Initialize stack and data segment
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M.x86.R_SS = STACK_SEGMENT;
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M.x86.R_SP = STACK_START_OFFSET;
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M.x86.R_DS = DATA_SEGMENT;
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// push a HLT instruction and a pointer to it onto the stack
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// any return will pop the pointer and jump to the HLT, thus
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// exiting (more or less) cleanly
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push_word(0xf4f4); //F4=HLT
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push_word(M.x86.R_SS);
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push_word(M.x86.R_SP + 2);
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CHECK_DBG(DEBUG_TRACE_X86EMU) {
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X86EMU_trace_on();
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} else {
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#ifdef DEBUG
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M.x86.debug |= DEBUG_SAVE_IP_CS_F;
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M.x86.debug |= DEBUG_DECODE_F;
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M.x86.debug |= DEBUG_DECODE_NOPRINT_F;
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#endif
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}
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CHECK_DBG(DEBUG_JMP) {
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M.x86.debug |= DEBUG_TRACEJMP_F;
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M.x86.debug |= DEBUG_TRACEJMP_REGS_F;
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M.x86.debug |= DEBUG_TRACECALL_F;
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M.x86.debug |= DEBUG_TRACECALL_REGS_F;
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}
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DEBUG_PRINTF("Executing Initialization Vector...\n");
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X86EMU_exec();
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DEBUG_PRINTF("done\n");
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/* According to the PNP BIOS Spec, Option ROMs should upon exit, return
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* some boot device status in AX (see PNP BIOS Spec Section 3.3
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*/
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DEBUG_PRINTF_CS_IP("Option ROM Exit Status: %04x\n", M.x86.R_AX);
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#ifdef DEBUG
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DEBUG_PRINTF("Exit Status Decode:\n");
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if (M.x86.R_AX & 0x100) { // bit 8
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DEBUG_PRINTF
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(" IPL Device supporting INT 13h Block Device Format:\n");
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switch (((M.x86.R_AX >> 4) & 0x3)) { // bits 5:4
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case 0:
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DEBUG_PRINTF(" No IPL Device attached\n");
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break;
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case 1:
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DEBUG_PRINTF(" IPL Device status unknown\n");
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break;
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case 2:
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DEBUG_PRINTF(" IPL Device attached\n");
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break;
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case 3:
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DEBUG_PRINTF(" IPL Device status RESERVED!!\n");
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break;
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}
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}
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if (M.x86.R_AX & 0x80) { // bit 7
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DEBUG_PRINTF
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(" Output Device supporting INT 10h Character Output:\n");
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switch (((M.x86.R_AX >> 4) & 0x3)) { // bits 5:4
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case 0:
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DEBUG_PRINTF(" No Display Device attached\n");
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break;
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case 1:
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DEBUG_PRINTF(" Display Device status unknown\n");
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break;
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case 2:
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DEBUG_PRINTF(" Display Device attached\n");
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break;
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case 3:
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DEBUG_PRINTF(" Display Device status RESERVED!!\n");
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break;
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}
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}
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if (M.x86.R_AX & 0x40) { // bit 6
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DEBUG_PRINTF
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(" Input Device supporting INT 9h Character Input:\n");
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switch (((M.x86.R_AX >> 4) & 0x3)) { // bits 5:4
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case 0:
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DEBUG_PRINTF(" No Input Device attached\n");
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break;
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case 1:
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DEBUG_PRINTF(" Input Device status unknown\n");
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break;
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case 2:
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DEBUG_PRINTF(" Input Device attached\n");
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break;
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case 3:
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DEBUG_PRINTF(" Input Device status RESERVED!!\n");
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break;
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}
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}
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#endif
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/* Check whether the stack is "clean" i.e. containing the HLT
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* instruction we pushed before executing and pointing to the original
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* stack address... indicating that the initialization probably was
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* successful
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*/
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if ((pop_word() == 0xf4f4) && (M.x86.R_SS == STACK_SEGMENT)
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&& (M.x86.R_SP == STACK_START_OFFSET)) {
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DEBUG_PRINTF("Stack is clean, initialization successfull!\n");
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} else {
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DEBUG_PRINTF
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("Stack unclean, initialization probably NOT COMPLETE!!\n");
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DEBUG_PRINTF("SS:SP = %04x:%04x, expected: %04x:%04x\n",
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M.x86.R_SS, M.x86.R_SP, STACK_SEGMENT,
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STACK_START_OFFSET);
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}
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// TODO: according to the BIOS Boot Spec initializations may be ended using INT18h and setting
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// the status.
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// We need to implement INT18 accordingly, pseudo code is in specsbbs101.pdf page 30
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// (also for Int19)
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return 0;
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}
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