| // 32bit code to Power On Self Test (POST) a machine. |
| // |
| // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net> |
| // Copyright (C) 2002 MandrakeSoft S.A. |
| // |
| // This file may be distributed under the terms of the GNU GPLv3 license. |
| |
| #include "ioport.h" // PORT_* |
| #include "../out/rom16.offset.auto.h" // OFFSET_* |
| #include "config.h" // CONFIG_* |
| #include "cmos.h" // CMOS_* |
| #include "util.h" // memset |
| #include "biosvar.h" // struct bios_data_area_s |
| #include "ata.h" // hard_drive_setup |
| #include "kbd.h" // kbd_setup |
| #include "disk.h" // floppy_drive_setup |
| |
| #define bda ((struct bios_data_area_s *)MAKE_FARPTR(SEG_BDA, 0)) |
| #define ebda ((struct extended_bios_data_area_s *)MAKE_FARPTR(SEG_EBDA, 0)) |
| |
| static void |
| init_bda() |
| { |
| memset(bda, 0, sizeof(*bda)); |
| |
| int i; |
| for (i=0; i<256; i++) { |
| SET_BDA(ivecs[i].seg, SEG_BIOS); |
| SET_BDA(ivecs[i].offset, OFFSET_dummy_iret_handler); |
| } |
| |
| SET_BDA(mem_size_kb, BASE_MEM_IN_K); |
| |
| // Set BDA Equipment Word - 0x06 = FPU enable, mouse installed |
| SET_BDA(equipment_list_flags, 0x06); |
| |
| // set vector 0x79 to zero |
| // this is used by 'gardian angel' protection system |
| SET_BDA(ivecs[0x79].seg, 0); |
| SET_BDA(ivecs[0x79].offset, 0); |
| |
| SET_BDA(ivecs[0x40].offset, OFFSET_entry_40); |
| SET_BDA(ivecs[0x0e].offset, OFFSET_entry_0e); |
| SET_BDA(ivecs[0x13].offset, OFFSET_entry_13); |
| SET_BDA(ivecs[0x76].offset, OFFSET_entry_76); |
| SET_BDA(ivecs[0x17].offset, OFFSET_entry_17); |
| SET_BDA(ivecs[0x18].offset, OFFSET_entry_18); |
| SET_BDA(ivecs[0x19].offset, OFFSET_entry_19); |
| SET_BDA(ivecs[0x1c].offset, OFFSET_entry_1c); |
| SET_BDA(ivecs[0x12].offset, OFFSET_entry_12); |
| SET_BDA(ivecs[0x11].offset, OFFSET_entry_11); |
| SET_BDA(ivecs[0x15].offset, OFFSET_entry_15); |
| SET_BDA(ivecs[0x08].offset, OFFSET_entry_08); |
| SET_BDA(ivecs[0x09].offset, OFFSET_entry_09); |
| SET_BDA(ivecs[0x16].offset, OFFSET_entry_16); |
| SET_BDA(ivecs[0x14].offset, OFFSET_entry_14); |
| SET_BDA(ivecs[0x1a].offset, OFFSET_entry_1a); |
| SET_BDA(ivecs[0x70].offset, OFFSET_entry_70); |
| SET_BDA(ivecs[0x74].offset, OFFSET_entry_74); |
| SET_BDA(ivecs[0x75].offset, OFFSET_entry_75); |
| SET_BDA(ivecs[0x10].offset, OFFSET_entry_10); |
| |
| SET_BDA(ivecs[0x1E].offset, OFFSET_diskette_param_table2); |
| } |
| |
| static void |
| init_ebda() |
| { |
| memset(ebda, 0, sizeof(*ebda)); |
| ebda->size = EBDA_SIZE; |
| SET_BDA(ebda_seg, SEG_EBDA); |
| SET_BDA(ivecs[0x41].seg, SEG_EBDA); |
| SET_BDA(ivecs[0x41].offset |
| , offsetof(struct extended_bios_data_area_s, fdpt[0])); |
| SET_BDA(ivecs[0x46].seg, SEG_EBDA); |
| SET_BDA(ivecs[0x41].offset |
| , offsetof(struct extended_bios_data_area_s, fdpt[1])); |
| } |
| |
| static void |
| ram_probe(void) |
| { |
| u32 rs = (inb_cmos(CMOS_MEM_EXTMEM2_LOW) |
| | (inb_cmos(CMOS_MEM_EXTMEM2_HIGH) << 8)) * 65536; |
| if (rs) |
| rs += 16 * 1024 * 1024; |
| else |
| rs = ((inb_cmos(CMOS_MEM_EXTMEM_LOW) |
| | (inb_cmos(CMOS_MEM_EXTMEM_HIGH) << 8)) * 1024 |
| + 1 * 1024 * 1024); |
| |
| SET_EBDA(ram_size, rs); |
| BX_INFO("ram_size=0x%08x\n", rs); |
| } |
| |
| static void |
| pic_setup() |
| { |
| outb(0x11, PORT_PIC1); |
| outb(0x11, PORT_PIC2); |
| outb(0x08, PORT_PIC1_DATA); |
| outb(0x70, PORT_PIC2_DATA); |
| outb(0x04, PORT_PIC1_DATA); |
| outb(0x02, PORT_PIC2_DATA); |
| outb(0x01, PORT_PIC1_DATA); |
| outb(0x01, PORT_PIC2_DATA); |
| outb(0xb8, PORT_PIC1_DATA); |
| if (CONFIG_PS2_MOUSE) |
| outb(0x8f, PORT_PIC2_DATA); |
| else |
| outb(0x9f, PORT_PIC2_DATA); |
| } |
| |
| static void |
| init_boot_vectors() |
| { |
| // Floppy drive |
| struct ipl_entry_s *ip = &ebda->ipl.table[0]; |
| ip->type = IPL_TYPE_FLOPPY; |
| ip++; |
| |
| // First HDD |
| ip->type = IPL_TYPE_HARDDISK; |
| ip++; |
| |
| // CDROM |
| if (CONFIG_CDROM_BOOT) { |
| ip->type = IPL_TYPE_CDROM; |
| ip++; |
| } |
| |
| ebda->ipl.count = ip - ebda->ipl.table; |
| ebda->ipl.sequence = 0xffff; |
| ebda->ipl.bootorder = (inb_cmos(CMOS_BIOS_BOOTFLAG2) |
| | ((inb_cmos(CMOS_BIOS_BOOTFLAG1) & 0xf0) << 4)); |
| if (!(inb_cmos(CMOS_BIOS_BOOTFLAG1) & 1)) |
| ebda->ipl.checkfloppysig = 1; |
| } |
| |
| static void |
| callrom(u16 seg, u16 offset) |
| { |
| struct bregs br; |
| memset(&br, 0, sizeof(br)); |
| br.es = SEG_BIOS; |
| br.di = OFFSET_pnp_string + 1; // starts 1 past for alignment |
| br.cs = seg; |
| br.ip = offset; |
| call16(&br); |
| } |
| |
| static void |
| rom_scan(u32 start, u32 end) |
| { |
| u8 *p = (u8*)start; |
| for (; p <= (u8*)end; p += 2048) { |
| u8 *rom = p; |
| if (*(u16*)rom != 0xaa55) |
| continue; |
| u32 len = rom[2] * 512; |
| if (checksum(rom, len) != 0) |
| continue; |
| p = (u8*)(((u32)p + len) / 2048 * 2048); |
| callrom(FARPTR_TO_SEG(rom), FARPTR_TO_OFFSET(rom + 3)); |
| |
| // Look at the ROM's PnP Expansion header. Properly, we're supposed |
| // to init all the ROMs and then go back and build an IPL table of |
| // all the bootable devices, but we can get away with one pass. |
| if (rom[0x1a] != '$' || rom[0x1b] != 'P' |
| || rom[0x1c] != 'n' || rom[0x1d] != 'P') |
| continue; |
| // 0x1A is also the offset into the expansion header of... |
| // the Bootstrap Entry Vector, or zero if there is none. |
| u16 entry = *(u16*)&rom[0x1a+0x1a]; |
| if (!entry) |
| continue; |
| // Found a device that thinks it can boot the system. Record |
| // its BEV and product name string. |
| |
| if (ebda->ipl.count >= ARRAY_SIZE(ebda->ipl.table)) |
| continue; |
| |
| struct ipl_entry_s *ip = &ebda->ipl.table[ebda->ipl.count]; |
| ip->type = IPL_TYPE_BEV; |
| ip->vector = (FARPTR_TO_SEG(rom) << 16) | entry; |
| |
| u16 desc = *(u16*)&rom[0x1a+0x10]; |
| if (desc) |
| ip->description = (u32)MAKE_FARPTR(FARPTR_TO_SEG(rom), desc); |
| |
| ebda->ipl.count++; |
| } |
| } |
| |
| static void |
| post() |
| { |
| if (CONFIG_DEBUG_SERIAL) |
| debug_serial_setup(); |
| |
| BX_INFO("Start bios\n"); |
| |
| init_bda(); |
| init_ebda(); |
| |
| timer_setup(); |
| kbd_setup(); |
| lpt_setup(); |
| serial_setup(); |
| pic_setup(); |
| |
| ram_probe(); |
| |
| rom_scan(0xc0000, 0xc7800); |
| |
| printf("BIOS - begin\n\n"); |
| |
| // clear bss section -- XXX - shouldn't use globals |
| extern char __bss_start[], __bss_end[]; |
| memset(__bss_start, 0, __bss_end - __bss_start); |
| |
| rombios32_init(); |
| |
| floppy_drive_setup(); |
| hard_drive_setup(); |
| |
| init_boot_vectors(); |
| |
| rom_scan(0xc8000, 0xe0000); |
| |
| interactive_bootmenu(); |
| |
| // reset the memory (some boot loaders such as syslinux suppose |
| // that the memory is set to zero) |
| memset((void*)0x40000, 0, 0x40000); // XXX - shouldn't use globals |
| |
| // Invoke int 19 to start boot process. |
| struct bregs br; |
| memset(&br, 0, sizeof(br)); |
| call16_int(0x19, &br); |
| } |
| |
| static void |
| init_dma() |
| { |
| // first reset the DMA controllers |
| outb(0, PORT_DMA1_MASTER_CLEAR); |
| outb(0, PORT_DMA2_MASTER_CLEAR); |
| |
| // then initialize the DMA controllers |
| outb(0xc0, PORT_DMA2_MODE_REG); |
| outb(0x00, PORT_DMA2_MASK_REG); |
| } |
| |
| static void |
| check_restart_status() |
| { |
| // Get and then clear CMOS shutdown status. |
| u8 status = inb_cmos(CMOS_RESET_CODE); |
| outb_cmos(0, CMOS_RESET_CODE); |
| |
| if (status == 0x00 || status == 0x09 || status >= 0x0d) |
| // Normal post |
| return; |
| |
| if (status != 0x05) { |
| BX_PANIC("Unimplemented shutdown status: %02x\n", status); |
| return; |
| } |
| |
| // XXX - this is supposed to jump without changing any memory - |
| // but the stack has been altered by the time the code gets here. |
| eoi_both_pics(); |
| struct bregs br; |
| memset(&br, 0, sizeof(br)); |
| br.cs = GET_BDA(jump_cs_ip) >> 16; |
| br.ip = GET_BDA(jump_cs_ip); |
| call16(&br); |
| } |
| |
| void VISIBLE32 |
| _start() |
| { |
| init_dma(); |
| check_restart_status(); |
| |
| post(); |
| } |
| |
| // Externally visible 32bit entry point. |
| asm( |
| ".global post32\n" |
| "post32:\n" |
| "cli\n" |
| "cld\n" |
| "lidtl " __stringify(0xf0000 | OFFSET_pmode_IDT_info) "\n" |
| "lgdtl " __stringify(0xf0000 | OFFSET_rombios32_gdt_48) "\n" |
| "movl $" __stringify(CONFIG_STACK_OFFSET) ", %esp\n" |
| "ljmp $0x10, $_start\n" |
| ); |