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// 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))
#define ipl ((struct ipl_s *)(IPL_SEG<<4))
static int
checksum(u8 *p, u32 len)
{
u32 i;
u8 sum = 0;
for (i=0; i<len; i++)
sum += p[i];
return sum;
}
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()
{
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_KBD_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);
/* flush incoming keys */
u16 max=0x2000;
while (--max > 0) {
outb(0x00, PORT_DIAG);
if (inb(PORT_KBD_STATUS) & 0x01) {
inb(PORT_KBD_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_KBD_STATUS);
kbd_flush(0x00);
kbd_waitdata(0x01);
/* read self-test result, 0x55 should be returned from 0x60 */
if ((inb(PORT_KBD_DATA) != 0x55))
keyboard_panic(991);
/* send cmd = 0xAB, keyboard interface test */
outb(0xab, PORT_KBD_STATUS);
kbd_flush(0x10);
kbd_waitdata(0x11);
/* read keyboard interface test result, */
/* 0x00 should be returned form 0x60 */
if ((inb(PORT_KBD_DATA) != 0x00))
keyboard_panic(992);
/* Enable Keyboard clock */
outb(0xae, PORT_KBD_STATUS);
outb(0xa8, PORT_KBD_STATUS);
/* ------------------- keyboard side ------------------------*/
/* reset kerboard and self test (keyboard side) */
outb(0xff, PORT_KBD_DATA);
kbd_flush(0x20);
kbd_waitdata(0x21);
/* keyboard should return ACK */
if ((inb(PORT_KBD_DATA) != 0xfa))
keyboard_panic(993);
kbd_waitdata(0x31);
if ((inb(PORT_KBD_DATA) != 0xaa))
keyboard_panic(994);
/* Disable keyboard */
outb(0xf5, PORT_KBD_DATA);
kbd_flush(0x40);
kbd_waitdata(0x41);
/* keyboard should return ACK */
if ((inb(PORT_KBD_DATA) != 0xfa))
keyboard_panic(995);
/* Write Keyboard Mode */
outb(0x60, PORT_KBD_STATUS);
kbd_flush(0x50);
/* send cmd: scan code convert, disable mouse, enable IRQ 1 */
outb(0x61, PORT_KBD_DATA);
kbd_flush(0x60);
/* Enable keyboard */
outb(0xf4, PORT_KBD_DATA);
kbd_flush(0x70);
kbd_waitdata(0x71);
/* keyboard should return ACK */
if ((inb(PORT_KBD_DATA) != 0xfa))
keyboard_panic(996);
outb(0x77, PORT_DIAG);
}
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)
{
// 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;
}
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 = bda->equipment_list_flags;
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);
bda->port_com[count] = port;
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 = bda->equipment_list_flags;
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;
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
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;
}
}
static void
ata_detect()
{
// XXX
}
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) + 1;
}
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);
}
static void
init_boot_vectors()
{
// Clear out the IPL table.
memset(ipl, 0, sizeof(*ipl));
// Floppy drive
struct ipl_entry_s *ip = &ipl->table[0];
ip->type = IPL_TYPE_FLOPPY;
ip++;
// First HDD
ip->type = IPL_TYPE_HARDDISK;
ip++;
// CDROM
if (CONFIG_ELTORITO_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()
{
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);
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++;
}
}
static void
status_restart(u8 status)
{
// XXX
#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();
// XXX - need to do pci stuff
//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();
}
callrom(0xf000, OFFSET_begin_boot);
}
void VISIBLE
_start()
{
post();
}