blob: 47349916fa9e4663d6423dc15e3f69a664ce5488 [file] [log] [blame]
// 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"
#include "kbd.h"
#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);
// mov CMOS Equipment Byte to BDA Equipment Word
SET_BDA(equipment_list_flags, inb_cmos(CMOS_EQUIPMENT_INFO));
}
static void
init_handlers()
{
// 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);
}
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, fdpt0));
SET_BDA(ivecs[0x46].seg, SEG_EBDA);
SET_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);
}
static u16
detect_parport(u16 port, u8 timeout, u8 count)
{
// clear input mode
outb(inb(port+2) & 0xdf, port+2);
outb(0xaa, port);
if (inb(port) != 0xaa)
// Not present
return 0;
SET_BDA(port_lpt[count], port);
SET_BDA(lpt_timeout[count], timeout);
return 1;
}
static void
lpt_setup()
{
u16 count = 0;
count += detect_parport(0x378, 0x14, count);
count += detect_parport(0x278, 0x14, count);
// Equipment word bits 14..15 determing # parallel ports
u16 eqb = GET_BDA(equipment_list_flags);
SET_BDA(equipment_list_flags, (eqb & 0x3fff) | (count << 14));
}
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);
SET_BDA(port_com[count], port);
SET_BDA(com_timeout[count], timeout);
return 1;
}
static void
serial_setup()
{
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 = GET_BDA(equipment_list_flags);
SET_BDA(equipment_list_flags, (eqb & 0xf1ff) | (count << 9));
}
static u32
bcd2bin(u8 val)
{
return (val & 0xf) + ((val >> 4) * 10);
}
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;
SET_BDA(timer_counter, ticks);
SET_BDA(timer_rollover, 0);
}
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
floppy_drive_post()
{
u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
u8 out = 0;
if (type & 0xf0)
out |= 0x07;
if (type & 0x0f)
out |= 0x70;
SET_BDA(floppy_harddisk_info, out);
outb(0x02, PORT_DMA1_MASK_REG);
SET_BDA(ivecs[0x1E].offset, OFFSET_diskette_param_table2);
}
static void
ata_init()
{
// hdidmap and cdidmap init.
u8 device;
for (device=0; device < CONFIG_MAX_ATA_DEVICES; device++) {
ebda->ata.idmap[0][device] = CONFIG_MAX_ATA_DEVICES;
ebda->ata.idmap[1][device] = CONFIG_MAX_ATA_DEVICES;
}
}
static void
fill_hdinfo(struct fdpt_s *info, u8 typecmos, u8 basecmos)
{
u8 type = inb_cmos(typecmos);
if (type != 47)
// XXX - halt
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;
}
// 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);
}
static void
hard_drive_post()
{
outb(0x0a, PORT_HD_DATA); // 0000 1010 = reserved, disable IRQ 14
SET_BDA(disk_count, 1);
SET_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);
}
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.bootfirst = 0xffff;
}
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()
{
BX_INFO("Start bios\n");
init_bda();
init_handlers();
init_ebda();
pit_setup();
kbd_setup();
lpt_setup();
serial_setup();
timer_setup();
pic_setup();
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();
init_boot_vectors();
floppy_drive_post();
hard_drive_post();
if (CONFIG_ATA) {
ata_init();
ata_detect();
}
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();
}