blob: 2c4f12b9e34a32e3b3a844aa1566f766aa8d5d1c [file] [log] [blame]
// 32bit code to Power On Self Test (POST) a machine.
//
// Copyright (C) 2008-2013 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2002 MandrakeSoft S.A.
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "biosvar.h" // SET_BDA
#include "block.h" // block_setup
#include "bregs.h" // struct bregs
#include "config.h" // CONFIG_*
#include "e820map.h" // e820_add
#include "fw/paravirt.h" // qemu_cfg_preinit
#include "fw/xen.h" // xen_preinit
#include "hw/pic.h" // pic_setup
#include "hw/ps2port.h" // ps2port_setup
#include "hw/rtc.h" // rtc_write
#include "hw/serialio.h" // serial_debug_preinit
#include "hw/usb.h" // usb_setup
#include "malloc.h" // malloc_init
#include "memmap.h" // SYMBOL
#include "output.h" // dprintf
#include "string.h" // memset
#include "util.h" // kbd_init
#include "tcgbios.h" // tpm_*
/****************************************************************
* BIOS initialization and hardware setup
****************************************************************/
static void
ivt_init(void)
{
dprintf(3, "init ivt\n");
// Initialize all vectors to the default handler.
int i;
for (i=0; i<256; i++)
SET_IVT(i, FUNC16(entry_iret_official));
// Initialize all hw vectors to a default hw handler.
for (i=BIOS_HWIRQ0_VECTOR; i<BIOS_HWIRQ0_VECTOR+8; i++)
SET_IVT(i, FUNC16(entry_hwpic1));
for (i=BIOS_HWIRQ8_VECTOR; i<BIOS_HWIRQ8_VECTOR+8; i++)
SET_IVT(i, FUNC16(entry_hwpic2));
// Initialize software handlers.
SET_IVT(0x02, FUNC16(entry_02));
SET_IVT(0x10, FUNC16(entry_10));
SET_IVT(0x11, FUNC16(entry_11));
SET_IVT(0x12, FUNC16(entry_12));
SET_IVT(0x13, FUNC16(entry_13_official));
SET_IVT(0x14, FUNC16(entry_14));
SET_IVT(0x15, FUNC16(entry_15_official));
SET_IVT(0x16, FUNC16(entry_16));
SET_IVT(0x17, FUNC16(entry_17));
SET_IVT(0x18, FUNC16(entry_18));
SET_IVT(0x19, FUNC16(entry_19_official));
SET_IVT(0x1a, FUNC16(entry_1a_official));
SET_IVT(0x40, FUNC16(entry_40));
// INT 60h-66h reserved for user interrupt
for (i=0x60; i<=0x66; i++)
SET_IVT(i, SEGOFF(0, 0));
// set vector 0x79 to zero
// this is used by 'gardian angel' protection system
SET_IVT(0x79, SEGOFF(0, 0));
}
static void
bda_init(void)
{
dprintf(3, "init bda\n");
struct bios_data_area_s *bda = MAKE_FLATPTR(SEG_BDA, 0);
memset(bda, 0, sizeof(*bda));
int esize = EBDA_SIZE_START;
u16 ebda_seg = EBDA_SEGMENT_START;
if (!CONFIG_MALLOC_UPPERMEMORY)
ebda_seg = FLATPTR_TO_SEG(ALIGN_DOWN(SYMBOL(final_varlow_start), 1024)
- EBDA_SIZE_START*1024);
SET_BDA(ebda_seg, ebda_seg);
SET_BDA(mem_size_kb, ebda_seg / (1024/16));
// Init ebda
struct extended_bios_data_area_s *ebda = get_ebda_ptr();
memset(ebda, 0, sizeof(*ebda));
ebda->size = esize;
e820_add((u32)ebda, BUILD_LOWRAM_END-(u32)ebda, E820_RESERVED);
// Init extra stack
StackPos = &ExtraStack[BUILD_EXTRA_STACK_SIZE] - SYMBOL(zonelow_base);
}
void
interface_init(void)
{
// Running at new code address - do code relocation fixups
malloc_init();
// Setup romfile items.
qemu_cfg_init();
coreboot_cbfs_init();
multiboot_init();
// Setup ivt/bda/ebda
ivt_init();
bda_init();
// Other interfaces
boot_init();
bios32_init();
pmm_init();
pnp_init();
kbd_init();
mouse_init();
}
// Initialize hardware devices
void
device_hardware_setup(void)
{
usb_setup();
ps2port_setup();
block_setup();
lpt_setup();
serial_setup();
cbfs_payload_setup();
}
static void
platform_hardware_setup(void)
{
// Make sure legacy DMA isn't running.
dma_setup();
// Init base pc hardware.
pic_setup();
thread_setup();
mathcp_setup();
// Platform specific setup
qemu_platform_setup();
coreboot_platform_setup();
// Setup timers and periodic clock interrupt
timer_setup();
clock_setup();
// Initialize TPM
tpm_setup();
}
void
prepareboot(void)
{
// Change TPM phys. presence state befor leaving BIOS
tpm_prepboot();
// Run BCVs
bcv_prepboot();
// Finalize data structures before boot
cdrom_prepboot();
pmm_prepboot();
malloc_prepboot();
e820_prepboot();
HaveRunPost = 2;
// Setup bios checksum.
BiosChecksum -= checksum((u8*)BUILD_BIOS_ADDR, BUILD_BIOS_SIZE);
}
// Begin the boot process by invoking an int0x19 in 16bit mode.
void VISIBLE32FLAT
startBoot(void)
{
// Clear low-memory allocations (required by PMM spec).
memset((void*)BUILD_STACK_ADDR, 0, BUILD_EBDA_MINIMUM - BUILD_STACK_ADDR);
dprintf(3, "Jump to int19\n");
struct bregs br;
memset(&br, 0, sizeof(br));
br.flags = F_IF;
call16_int(0x19, &br);
}
// Main setup code.
static void
maininit(void)
{
// Initialize internal interfaces.
interface_init();
// Setup platform devices.
platform_hardware_setup();
// Start hardware initialization (if threads allowed during optionroms)
if (threads_during_optionroms())
device_hardware_setup();
// Run vga option rom
vgarom_setup();
// Do hardware initialization (if running synchronously)
if (!threads_during_optionroms()) {
device_hardware_setup();
wait_threads();
}
// Run option roms
optionrom_setup();
// Allow user to modify overall boot order.
interactive_bootmenu();
wait_threads();
// Prepare for boot.
prepareboot();
// Write protect bios memory.
make_bios_readonly();
// Invoke int 19 to start boot process.
startBoot();
}
/****************************************************************
* POST entry and code relocation
****************************************************************/
// Update given relocs for the code at 'dest' with a given 'delta'
static void
updateRelocs(void *dest, u32 *rstart, u32 *rend, u32 delta)
{
u32 *reloc;
for (reloc = rstart; reloc < rend; reloc++)
*((u32*)(dest + *reloc)) += delta;
}
// Relocate init code and then call a function at its new address.
// The passed function should be in the "init" section and must not
// return.
void __noreturn
reloc_preinit(void *f, void *arg)
{
void (*func)(void *) __noreturn = f;
if (!CONFIG_RELOCATE_INIT)
func(arg);
// Allocate space for init code.
u32 initsize = SYMBOL(code32init_end) - SYMBOL(code32init_start);
u32 codealign = SYMBOL(_reloc_min_align);
void *codedest = memalign_tmp(codealign, initsize);
void *codesrc = VSYMBOL(code32init_start);
if (!codedest)
panic("No space for init relocation.\n");
// Copy code and update relocs (init absolute, init relative, and runtime)
dprintf(1, "Relocating init from %p to %p (size %d)\n"
, codesrc, codedest, initsize);
s32 delta = codedest - codesrc;
memcpy(codedest, codesrc, initsize);
updateRelocs(codedest, VSYMBOL(_reloc_abs_start), VSYMBOL(_reloc_abs_end)
, delta);
updateRelocs(codedest, VSYMBOL(_reloc_rel_start), VSYMBOL(_reloc_rel_end)
, -delta);
updateRelocs(VSYMBOL(code32flat_start), VSYMBOL(_reloc_init_start)
, VSYMBOL(_reloc_init_end), delta);
if (f >= codesrc && f < VSYMBOL(code32init_end))
func = f + delta;
// Call function in relocated code.
barrier();
func(arg);
}
// Runs after all code is present and prior to any modifications
void
code_mutable_preinit(void)
{
if (HaveRunPost)
// Already run
return;
// Setup reset-vector entry point (controls legacy reboots).
rtc_write(CMOS_RESET_CODE, 0);
barrier();
HaveRunPost = 1;
barrier();
}
// Setup for code relocation and then relocate.
void VISIBLE32INIT
dopost(void)
{
code_mutable_preinit();
// Detect ram and setup internal malloc.
qemu_preinit();
coreboot_preinit();
malloc_preinit();
// Relocate initialization code and call maininit().
reloc_preinit(maininit, NULL);
}
// Entry point for Power On Self Test (POST) - the BIOS initilization
// phase. This function makes the memory at 0xc0000-0xfffff
// read/writable and then calls dopost().
void VISIBLE32FLAT
handle_post(void)
{
if (!CONFIG_QEMU && !CONFIG_COREBOOT)
return;
serial_debug_preinit();
debug_banner();
// Check if we are running under Xen.
xen_preinit();
// Allow writes to modify bios area (0xf0000)
make_bios_writable();
// Now that memory is read/writable - start post process.
dopost();
}