blob: 8d35f97a76f635c089782ccacadc7949c51ddc1c [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
#define bda ((struct bios_data_area_s *)0)
#define ebda ((struct extended_bios_data_area_s *)(EBDA_SEG<<4))
static void
init_bda()
{
memset(bda, 0, sizeof(*bda));
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;
}
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()
{
ebda->size = EBDA_SIZE;
bda->ebda_seg = EBDA_SEG;
bda->ivecs[0x41].seg = EBDA_SEG;
bda->ivecs[0x41].offset = 0x3d; // XXX
bda->ivecs[0x46].seg = EBDA_SEG;
bda->ivecs[0x46].offset = 0x4d; // XXX
}
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 void
kbd_init()
{
}
static void
kbd_setup()
{
bda->kbd_mode = 0x10;
bda->kbd_buf_head = bda->kbd_buf_tail = offsetof(struct bios_data_area_s, kbd_buf);
bda->kbd_buf_start_offset = offsetof(struct bios_data_area_s, kbd_buf);
bda->kbd_buf_end_offset = offsetof(struct bios_data_area_s, kbd_buf[sizeof(bda->kbd_buf)]);
kbd_init();
// XXX
u16 eqb = bda->equipment_list_flags;
eqb = (eqb & 0xff00) | inb_cmos(CMOS_EQUIPMENT_INFO);
bda->equipment_list_flags = eqb;
}
static void
lpt_setup()
{
// XXX
}
static void
serial_setup()
{
// XXX
}
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;
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);
}
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;
}
static void
cdemu_init()
{
//ebda->cdemu.active = 0;
}
static void
ata_init()
{
}
static void
ata_detect()
{
}
static void
hard_drive_post()
{
}
static void
init_boot_vectors()
{
}
static void __attribute__((noinline))
call16(u16 seg, u16 offset)
{
u32 segoff = (seg << 16) | offset;
asm volatile(
"pushal\n" // Save registers
"ljmp $0x20, %0\n" // Jump to 16bit transition code
".globl call16_resume\n"
"call16_resume:\n" // point of return
"popal\n" // restore registers
: : "Z" (OFFSET_call16), "b" (segoff));
}
static int
checksum(u8 *p, u32 len)
{
u32 i;
u8 sum = 0;
for (i=0; i<len; i++)
sum += p[i];
return sum;
}
#define PTR_TO_SEG(p) ((((u32)(p)) >> 4) & 0xf000)
#define PTR_TO_OFFSET(p) (((u32)(p)) & 0xffff)
static void
rom_scan()
{
u8 *p = (u8*)0xc0000;
for (; p <= (u8*)0xe0000; p += 2048) {
u8 *rom = p;
if (*(u16*)rom != 0xaa55)
continue;
u32 len = rom[2] * 512;
if (checksum(rom, len) != 0)
continue;
p = (u8*)(((u32)p + len) / 2048 * 2048);
call16(PTR_TO_SEG(rom), PTR_TO_OFFSET(rom + 3));
// Look at the ROM's PnP Expansion header. Properly, we're supposed
// to init all the ROMs and then go back and build an IPL table of
// all the bootable devices, but we can get away with one pass.
if (rom[0x1a] != '$' || 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.
// XXX
}
}
static void
status_restart(u8 status)
{
#if 0
if (status == 0x05)
eoi_jmp_post();
#endif
BX_PANIC("Unimplemented shutdown status: %02x\n",(Bit8u)status);
}
static void
post()
{
// 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);
// 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)
status_restart(status);
BX_INFO("Start bios");
init_bda();
init_handlers();
init_ebda();
pit_setup();
kbd_setup();
lpt_setup();
serial_setup();
timer_setup();
pic_setup();
//pci_setup();
init_boot_vectors();
rom_scan();
printf("BIOS - begin\n\n");
floppy_drive_post();
hard_drive_post();
if (CONFIG_ATA) {
ata_init();
ata_detect();
}
cdemu_init();
call16(0xf000, OFFSET_begin_boot);
}
void VISIBLE
_start()
{
post();
}