// 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.
+// This file may be distributed under the terms of the GNU LGPLv3 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
-
-#define bda ((struct bios_data_area_s *)0)
-#define ebda ((struct extended_bios_data_area_s *)(EBDA_SEG<<4))
-#define ipl ((struct ipl_s *)(IPL_SEG<<4))
-
-static u8
-checksum(u8 *p, u32 len)
+#include "disk.h" // floppy_drive_setup
+#include "memmap.h" // add_e820
+#include "pic.h" // pic_setup
+#include "pci.h" // create_pirtable
+#include "acpi.h" // acpi_bios_init
+#include "bregs.h" // struct bregs
+#include "boot.h" // IPL
+
+void
+__set_irq(int vector, void *loc)
{
- u32 i;
- u8 sum = 0;
- for (i=0; i<len; i++)
- sum += p[i];
- return sum;
+ SET_IVT(vector, SEG_BIOS, (u32)loc - BUILD_BIOS_ADDR);
}
+#define set_irq(vector, func) do { \
+ extern void func (void); \
+ __set_irq(vector, func); \
+ } while (0)
+
static void
-init_bda()
+init_ivt()
{
- memset(bda, 0, sizeof(*bda));
+ dprintf(3, "init ivt\n");
+ // Initialize all vectors to a dummy handler.
int i;
- for (i=0; i<256; i++) {
- bda->ivecs[i].seg = 0xf000;
- bda->ivecs[i].offset = OFFSET_dummy_iret_handler;
- }
-
- bda->mem_size_kb = BASE_MEM_IN_K;
-}
+ for (i=0; i<256; i++)
+ set_irq(i, dummy_iret_handler);
+
+ // Initialize all hw vectors to a default hw handler.
+ for (i=0x08; i<=0x0f; i++)
+ set_irq(i, entry_hwpic1);
+ for (i=0x70; i<=0x77; i++)
+ set_irq(i, entry_hwpic2);
+
+ // Initialize software handlers.
+ set_irq(0x10, entry_10);
+ set_irq(0x11, entry_11_official);
+ set_irq(0x12, entry_12_official);
+ set_irq(0x13, entry_13_official);
+ set_irq(0x14, entry_14);
+ set_irq(0x15, entry_15);
+ set_irq(0x16, entry_16);
+ set_irq(0x17, entry_17);
+ set_irq(0x18, entry_18);
+ set_irq(0x19, entry_19_official);
+ set_irq(0x1a, entry_1a);
+ set_irq(0x1c, entry_1c);
+ set_irq(0x40, entry_40);
-static void
-init_handlers()
-{
// set vector 0x79 to zero
// this is used by 'gardian angel' protection system
- bda->ivecs[0x79].seg = 0;
- bda->ivecs[0x79].offset = 0;
-
- bda->ivecs[0x40].offset = OFFSET_entry_40;
- bda->ivecs[0x0e].offset = OFFSET_entry_0e;
- bda->ivecs[0x13].offset = OFFSET_entry_13;
- bda->ivecs[0x76].offset = OFFSET_entry_76;
- bda->ivecs[0x17].offset = OFFSET_entry_17;
- bda->ivecs[0x18].offset = OFFSET_entry_18;
- bda->ivecs[0x19].offset = OFFSET_entry_19;
- bda->ivecs[0x1c].offset = OFFSET_entry_1c;
- bda->ivecs[0x12].offset = OFFSET_entry_12;
- bda->ivecs[0x11].offset = OFFSET_entry_11;
- bda->ivecs[0x15].offset = OFFSET_entry_15;
- bda->ivecs[0x08].offset = OFFSET_entry_08;
- bda->ivecs[0x09].offset = OFFSET_entry_09;
- bda->ivecs[0x16].offset = OFFSET_entry_16;
- bda->ivecs[0x14].offset = OFFSET_entry_14;
- bda->ivecs[0x1a].offset = OFFSET_entry_1a;
- bda->ivecs[0x70].offset = OFFSET_entry_70;
- bda->ivecs[0x74].offset = OFFSET_entry_74;
- bda->ivecs[0x75].offset = OFFSET_entry_75;
- bda->ivecs[0x10].offset = OFFSET_entry_10;
-}
-
-static void
-init_ebda()
-{
- memset(ebda, 0, sizeof(*ebda));
- ebda->size = EBDA_SIZE;
- bda->ebda_seg = EBDA_SEG;
- bda->ivecs[0x41].seg = EBDA_SEG;
- bda->ivecs[0x41].offset = offsetof(struct extended_bios_data_area_s, fdpt0);
- bda->ivecs[0x46].seg = EBDA_SEG;
- bda->ivecs[0x41].offset = offsetof(struct extended_bios_data_area_s, fdpt1);
-}
-
-static void
-pit_setup()
-{
- // timer0: binary count, 16bit count, mode 2
- outb(0x34, PORT_PIT_MODE);
- // maximum count of 0000H = 18.2Hz
- outb(0x0, PORT_PIT_COUNTER0);
- outb(0x0, PORT_PIT_COUNTER0);
-}
-
-//--------------------------------------------------------------------------
-// keyboard_panic
-//--------------------------------------------------------------------------
-static void
-keyboard_panic(u16 status)
-{
- // If you're getting a 993 keyboard panic here,
- // please see the comment in keyboard_init
-
- BX_PANIC("Keyboard error:%u\n",status);
-}
-
-static void
-kbd_wait(u8 mask, u8 code)
-{
- u16 max = 0xffff;
- while ( ((inb(PORT_PS2_STATUS) & mask) == 0) && (--max>0) )
- outb(code, PORT_DIAG);
- if (!max)
- keyboard_panic(code);
-}
-
-static inline void kbd_flush(u8 code) {
- kbd_wait(0x02, code);
-}
-static inline void kbd_waitdata(u8 code) {
- kbd_wait(0x01, code);
-}
-
-//--------------------------------------------------------------------------
-// keyboard_init
-//--------------------------------------------------------------------------
-// this file is based on LinuxBIOS implementation of keyboard.c
-// could convert to #asm to gain space
-static void
-keyboard_init()
-{
- /* ------------------- Flush buffers ------------------------*/
- /* Wait until buffer is empty */
- kbd_flush(0x00);
+ SET_IVT(0x79, 0, 0);
- /* flush incoming keys */
- u16 max=0x2000;
- while (--max > 0) {
- outb(0x00, PORT_DIAG);
- if (inb(PORT_PS2_STATUS) & 0x01) {
- inb(PORT_PS2_DATA);
- max = 0x2000;
- }
- }
-
- // Due to timer issues, and if the IPS setting is > 15000000,
- // the incoming keys might not be flushed here. That will
- // cause a panic a few lines below. See sourceforge bug report :
- // [ 642031 ] FATAL: Keyboard RESET error:993
-
- /* ------------------- controller side ----------------------*/
- /* send cmd = 0xAA, self test 8042 */
- outb(0xaa, PORT_PS2_STATUS);
-
- kbd_flush(0x00);
- kbd_waitdata(0x01);
-
- /* read self-test result, 0x55 should be returned from 0x60 */
- if (inb(PORT_PS2_DATA) != 0x55)
- keyboard_panic(991);
-
- /* send cmd = 0xAB, keyboard interface test */
- outb(0xab, PORT_PS2_STATUS);
-
- kbd_flush(0x10);
- kbd_waitdata(0x11);
-
- /* read keyboard interface test result, */
- /* 0x00 should be returned form 0x60 */
- if (inb(PORT_PS2_DATA) != 0x00)
- keyboard_panic(992);
-
- /* Enable Keyboard clock */
- outb(0xae, PORT_PS2_STATUS);
- outb(0xa8, PORT_PS2_STATUS);
-
- /* ------------------- keyboard side ------------------------*/
- /* reset kerboard and self test (keyboard side) */
- outb(0xff, PORT_PS2_DATA);
-
- kbd_flush(0x20);
- kbd_waitdata(0x21);
-
- /* keyboard should return ACK */
- if (inb(PORT_PS2_DATA) != 0xfa)
- keyboard_panic(993);
-
- kbd_waitdata(0x31);
-
- if (inb(PORT_PS2_DATA) != 0xaa)
- keyboard_panic(994);
-
- /* Disable keyboard */
- outb(0xf5, PORT_PS2_DATA);
-
- kbd_flush(0x40);
- kbd_waitdata(0x41);
-
- /* keyboard should return ACK */
- if (inb(PORT_PS2_DATA) != 0xfa)
- keyboard_panic(995);
-
- /* Write Keyboard Mode */
- outb(0x60, PORT_PS2_STATUS);
-
- kbd_flush(0x50);
-
- /* send cmd: scan code convert, disable mouse, enable IRQ 1 */
- outb(0x61, PORT_PS2_DATA);
-
- kbd_flush(0x60);
-
- /* Enable keyboard */
- outb(0xf4, PORT_PS2_DATA);
-
- kbd_flush(0x70);
- kbd_waitdata(0x71);
-
- /* keyboard should return ACK */
- if (inb(PORT_PS2_DATA) != 0xfa)
- keyboard_panic(996);
-
- outb(0x77, PORT_DIAG);
+ __set_irq(0x1E, &diskette_param_table2);
}
static void
-kbd_setup()
-{
- bda->kbd_mode = 0x10;
- bda->kbd_buf_head = bda->kbd_buf_tail = bda->kbd_buf_start_offset
- = offsetof(struct bios_data_area_s, kbd_buf) - 0x400;
- bda->kbd_buf_end_offset
- = (offsetof(struct bios_data_area_s, kbd_buf[sizeof(bda->kbd_buf)])
- - 0x400);
- keyboard_init();
-
- // mov CMOS Equipment Byte to BDA Equipment Word
- u16 eqb = bda->equipment_list_flags;
- bda->equipment_list_flags = (eqb & 0xff00) | inb_cmos(CMOS_EQUIPMENT_INFO);
-}
-
-static u16
-detect_parport(u16 port, u8 timeout, u8 count)
+init_bda()
{
- // clear input mode
- outb(inb(port+2) & 0xdf, port+2);
-
- outb(0xaa, port);
- if (inb(port) != 0xaa)
- // Not present
- return 0;
- bda->port_lpt[count] = port;
- bda->lpt_timeout[count] = timeout;
- return 1;
-}
+ dprintf(3, "init bda\n");
-static void
-lpt_setup()
-{
- u16 count = 0;
- count += detect_parport(0x378, 0x14, count);
- count += detect_parport(0x278, 0x14, count);
+ struct bios_data_area_s *bda = MAKE_FARPTR(SEG_BDA, 0);
+ memset(bda, 0, sizeof(*bda));
- // Equipment word bits 14..15 determing # parallel ports
- u16 eqb = bda->equipment_list_flags;
- bda->equipment_list_flags = (eqb & 0x3fff) | (count << 14);
-}
+ int esize = DIV_ROUND_UP(sizeof(struct extended_bios_data_area_s), 1024);
+ SET_BDA(mem_size_kb, 640 - esize);
+ u16 eseg = FARPTR_TO_SEG((640 - esize) * 1024);
+ SET_BDA(ebda_seg, eseg);
-static u16
-detect_serial(u16 port, u8 timeout, u8 count)
-{
- outb(0x02, port+1);
- if (inb(port+1) != 0x02)
- return 0;
- if (inb(port+2) != 0x02)
- return 0;
- outb(0x00, port+1);
- bda->port_com[count] = port;
- bda->com_timeout[count] = timeout;
- return 1;
+ struct extended_bios_data_area_s *ebda = get_ebda_ptr();
+ memset(ebda, 0, sizeof(*ebda));
+ ebda->size = esize;
+ SET_IVT(0x41, eseg, offsetof(struct extended_bios_data_area_s, fdpt[0]));
+ SET_IVT(0x46, eseg, offsetof(struct extended_bios_data_area_s, fdpt[1]));
}
static void
-serial_setup()
+ram_probe(void)
{
- u16 count = 0;
- count += detect_serial(0x3f8, 0x0a, count);
- count += detect_serial(0x2f8, 0x0a, count);
- count += detect_serial(0x3e8, 0x0a, count);
- count += detect_serial(0x2e8, 0x0a, count);
-
- // Equipment word bits 9..11 determing # serial ports
- u16 eqb = bda->equipment_list_flags;
- bda->equipment_list_flags = (eqb & 0xf1ff) | (count << 9);
-}
+ dprintf(3, "Find memory size\n");
+ if (CONFIG_COREBOOT) {
+ coreboot_fill_map();
+ } else {
+ // On emulators, get memory size from nvram.
+ u32 rs = ((inb_cmos(CMOS_MEM_EXTMEM2_LOW) << 16)
+ | (inb_cmos(CMOS_MEM_EXTMEM2_HIGH) << 24));
+ if (rs)
+ rs += 16 * 1024 * 1024;
+ else
+ rs = (((inb_cmos(CMOS_MEM_EXTMEM_LOW) << 10)
+ | (inb_cmos(CMOS_MEM_EXTMEM_HIGH) << 18))
+ + 1 * 1024 * 1024);
+ RamSize = rs;
+ add_e820(0, rs, E820_RAM);
+
+ // Check for memory over 4Gig
+ u64 high = ((inb_cmos(CMOS_MEM_HIGHMEM_LOW) << 16)
+ | (inb_cmos(CMOS_MEM_HIGHMEM_MID) << 24)
+ | ((u64)inb_cmos(CMOS_MEM_HIGHMEM_HIGH) << 32));
+ RamSizeOver4G = high;
+ add_e820(0x100000000ull, high, E820_RAM);
+
+ /* reserve 256KB BIOS area at the end of 4 GB */
+ add_e820(0xfffc0000, 256*1024, E820_RESERVED);
+ }
-static u32
-bcd2bin(u8 val)
-{
- return (val & 0xf) + ((val >> 4) * 10);
-}
+ // Don't declare any memory between 0xa0000 and 0x100000
+ add_e820(0xa0000, 0x50000, E820_HOLE);
-static void
-timer_setup()
-{
- u32 seconds = bcd2bin(inb_cmos(CMOS_RTC_SECONDS));
- u32 ticks = (seconds * 18206507) / 1000000;
- u32 minutes = bcd2bin(inb_cmos(CMOS_RTC_MINUTES));
- ticks += (minutes * 10923904) / 10000;
- u32 hours = bcd2bin(inb_cmos(CMOS_RTC_HOURS));
- ticks += (hours * 65543427) / 1000;
- bda->timer_counter = ticks;
- bda->timer_rollover = 0;
-}
-
-static void
-pic_setup()
-{
- outb(0x11, PORT_PIC1);
- outb(0x11, PORT_PIC2_DATA);
- 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);
-}
+ // Mark known areas as reserved.
+ u16 ebda_seg = get_ebda_seg();
+ add_e820((u32)MAKE_FARPTR(ebda_seg, 0), GET_EBDA2(ebda_seg, size) * 1024
+ , E820_RESERVED);
+ add_e820(BUILD_BIOS_ADDR, BUILD_BIOS_SIZE, E820_RESERVED);
-static void
-floppy_drive_post()
-{
- u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
- u8 out = 0;
- if (type & 0xf0)
- out |= 0x07;
- if (type & 0x0f)
- out |= 0x70;
- bda->floppy_harddisk_info = out;
- outb(0x02, PORT_DMA1_MASK_REG);
-
- bda->ivecs[0x1E].offset = OFFSET_diskette_param_table2;
-}
+ if (CONFIG_KVM)
+ // 4 pages before the bios, 3 pages for vmx tss pages, the
+ // other page for EPT real mode pagetable
+ add_e820(0xfffbc000, 4*4096, E820_RESERVED);
-static void
-ata_init()
-{
- // hdidmap and cdidmap init.
- u8 device;
- for (device=0; device < CONFIG_MAX_ATA_DEVICES; device++) {
- ebda->ata.hdidmap[device] = CONFIG_MAX_ATA_DEVICES;
- ebda->ata.cdidmap[device] = CONFIG_MAX_ATA_DEVICES;
- }
+ dprintf(1, "Ram Size=0x%08x\n", RamSize);
}
static void
-fill_hdinfo(struct fdpt_s *info, u8 typecmos, u8 basecmos)
+init_bios_tables(void)
{
- u8 type = inb_cmos(typecmos);
- if (type != 47)
- // XXX - halt
+ if (CONFIG_COREBOOT)
+ // XXX - not supported on coreboot yet.
return;
- info->precompensation = (inb_cmos(basecmos+4) << 8) | inb_cmos(basecmos+3);
- info->drive_control_byte = inb_cmos(basecmos+5);
- info->landing_zone = (inb_cmos(basecmos+7) << 8) | inb_cmos(basecmos+6);
- u16 cyl = (inb_cmos(basecmos+1) << 8) | inb_cmos(basecmos+0);
- u8 heads = inb_cmos(basecmos+2);
- u8 sectors = inb_cmos(basecmos+8);
- if (cyl < 1024) {
- // no logical CHS mapping used, just physical CHS
- // use Standard Fixed Disk Parameter Table (FDPT)
- info->cylinders = cyl;
- info->heads = heads;
- info->sectors = sectors;
- return;
- }
+ create_pirtable();
- // complies with Phoenix style Translated Fixed Disk Parameter
- // Table (FDPT)
- info->phys_cylinders = cyl;
- info->phys_heads = heads;
- info->phys_sectors = sectors;
- info->sectors = sectors;
- info->a0h_signature = 0xa0;
- if (cyl > 8192) {
- cyl >>= 4;
- heads <<= 4;
- } else if (cyl > 4096) {
- cyl >>= 3;
- heads <<= 3;
- } else if (cyl > 2048) {
- cyl >>= 2;
- heads <<= 2;
- }
- info->cylinders = cyl;
- info->heads = heads;
- info->checksum = ~checksum((u8*)info, sizeof(*info)-1) + 1;
-}
+ mptable_init();
-static void
-hard_drive_post()
-{
- outb(0x0a, 0x03f6); // 0000 1010 = reserved, disable IRQ 14
- bda->disk_count = 1;
- bda->disk_control_byte = 0xc0;
-
- // move disk geometry data from CMOS to EBDA disk parameter table(s)
- u8 diskinfo = inb_cmos(CMOS_DISK_DATA);
- if ((diskinfo & 0xf0) == 0xf0)
- // Fill EBDA table for hard disk 0.
- fill_hdinfo(&ebda->fdpt0, CMOS_DISK_DRIVE1_TYPE, CMOS_DISK_DRIVE1_CYL);
- if ((diskinfo & 0x0f) == 0x0f)
- // XXX - bochs halts on any other type
- // Fill EBDA table for hard disk 1.
- fill_hdinfo(&ebda->fdpt0, CMOS_DISK_DRIVE2_TYPE, CMOS_DISK_DRIVE2_CYL);
-}
+ smbios_init();
+ acpi_bios_init();
+}
static void
init_boot_vectors()
{
- // Clear out the IPL table.
- memset(ipl, 0, sizeof(*ipl));
+ if (! CONFIG_BOOT)
+ return;
+ dprintf(3, "init boot device ordering\n");
// Floppy drive
- struct ipl_entry_s *ip = &ipl->table[0];
+ struct ipl_entry_s *ip = &IPL.table[0];
ip->type = IPL_TYPE_FLOPPY;
ip++;
ip++;
// CDROM
- if (CONFIG_ELTORITO_BOOT) {
+ if (CONFIG_CDROM_BOOT) {
ip->type = IPL_TYPE_CDROM;
ip++;
}
- ipl->count = ip - ipl->table;
- ipl->sequence = 0xffff;
-}
-
-static void
-callrom(u16 seg, u16 offset)
-{
- struct bregs br;
- memset(&br, 0, sizeof(br));
- br.es = 0xf000;
- br.di = OFFSET_pnp_string;
- 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(PTR_TO_SEG(rom), PTR_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 (ipl->count >= ARRAY_SIZE(ipl->table))
- continue;
-
- struct ipl_entry_s *ip = &ipl->table[ipl->count];
- ip->type = IPL_TYPE_BEV;
- ip->vector = (PTR_TO_SEG(rom) << 16) | entry;
-
- u16 desc = *(u16*)&rom[0x1a+0x10];
- if (desc)
- ip->description = (PTR_TO_SEG(rom) << 16) | desc;
-
- ipl->count++;
+ IPL.count = ip - IPL.table;
+ SET_EBDA(boot_sequence, 0xffff);
+ if (CONFIG_COREBOOT) {
+ // XXX - hardcode defaults for coreboot.
+ IPL.bootorder = 0x00000231;
+ IPL.checkfloppysig = 1;
+ } else {
+ // On emulators, get boot order from nvram.
+ IPL.bootorder = (inb_cmos(CMOS_BIOS_BOOTFLAG2)
+ | ((inb_cmos(CMOS_BIOS_BOOTFLAG1) & 0xf0) << 4));
+ if (!(inb_cmos(CMOS_BIOS_BOOTFLAG1) & 1))
+ IPL.checkfloppysig = 1;
}
}
+// Main setup code.
static void
post()
{
- BX_INFO("Start bios\n");
-
+ init_ivt();
init_bda();
- init_handlers();
- init_ebda();
- pit_setup();
+ pic_setup();
+ timer_setup();
+ mathcp_setup();
+
+ smp_probe_setup();
+
+ memmap_setup();
+ ram_probe();
+ mtrr_setup();
+
+ pnp_setup();
+ vga_setup();
+
kbd_setup();
lpt_setup();
serial_setup();
- timer_setup();
- pic_setup();
-
- rom_scan(0xc0000, 0xc7800);
+ mouse_setup();
- printf("BIOS - begin\n\n");
+ pci_bios_setup();
+ smm_init();
- // XXX - need to do pci stuff
- //pci_setup();
- init_boot_vectors();
+ init_bios_tables();
+ memmap_finalize();
- floppy_drive_post();
- hard_drive_post();
- if (CONFIG_ATA)
- ata_init();
+ floppy_drive_setup();
+ hard_drive_setup();
init_boot_vectors();
- rom_scan(0xc8000, 0xe0000);
- callrom(0xf000, OFFSET_begin_boot);
+ optionrom_setup();
}
-static void
-init_dma()
+// 32-bit entry point.
+void VISIBLE32
+_start()
{
- // 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);
-}
+ init_dma();
-static void
-eoi_jmp_post()
-{
- // 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 = bda->jump_cs_ip >> 16;
- br.ip = bda->jump_cs_ip;
- call16(&br);
-}
+ debug_serial_setup();
+ dprintf(1, "Start bios\n");
-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);
+ // Allow writes to modify bios area (0xf0000)
+ make_bios_writable();
- if (status == 0x00 || status == 0x09 || status >= 0x0d)
- // Normal post
- return;
+ // Perform main setup code.
+ post();
- if (status == 0x05)
- eoi_jmp_post();
+ // Present the user with a bootup menu.
+ interactive_bootmenu();
- BX_PANIC("Unimplemented shutdown status: %02x\n", status);
-}
+ // Setup bios checksum.
+ extern char bios_checksum;
+ bios_checksum = -checksum((u8*)BUILD_BIOS_ADDR, BUILD_BIOS_SIZE - 1);
-void VISIBLE
-_start()
-{
- init_dma();
- check_restart_status();
+ // Prep for boot process.
+ make_bios_readonly();
- post();
+ // Invoke int 19 to start boot process.
+ dprintf(3, "Jump to int19\n");
+ struct bregs br;
+ memset(&br, 0, sizeof(br));
+ call16_int(0x19, &br);
}
+
+// Ughh - some older gcc compilers have a bug which causes VISIBLE32
+// functions to not be exported as a global variable - force _start
+// to be global here.
+asm(".global _start");
projects / seabios.git / blobdiff