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// 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 "bregs.h" // struct bregs
#include "config.h" // CONFIG_*
#include "fw/paravirt.h" // qemu_cfg_preinit
#include "fw/xen.h" // xen_preinit
#include "hw/ahci.h" // ahci_setup
#include "hw/ata.h" // ata_setup
#include "hw/cmos.h" // CMOS_*
#include "hw/esp-scsi.h" // esp_scsi_setup
#include "hw/lsi-scsi.h" // lsi_scsi_setup
#include "hw/megasas.h" // megasas_setup
#include "hw/pic.h" // pic_setup
#include "hw/ps2port.h" // ps2port_setup
#include "hw/usb.h" // usb_setup
#include "hw/virtio-blk.h" // virtio_blk_setup
#include "hw/virtio-scsi.h" // virtio_scsi_setup
#include "malloc.h" // malloc_init
#include "memmap.h" // add_e820
#include "output.h" // dprintf
#include "string.h" // memset
#include "util.h" // kbd_init
/****************************************************************
* BIOS initialization and hardware setup
****************************************************************/
static void
ivt_init(void)
{
dprintf(3, "init ivt\n");
// Setup reset-vector entry point (controls legacy reboots).
HaveRunPost = 1;
outb_cmos(0, CMOS_RESET_CODE);
// 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));
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;
extern u8 final_varlow_start[];
if (!CONFIG_MALLOC_UPPERMEMORY)
ebda_seg = FLATPTR_TO_SEG(ALIGN_DOWN((u32)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;
add_e820((u32)ebda, BUILD_LOWRAM_END-(u32)ebda, E820_RESERVED);
// Init extra stack
StackPos = (void*)(&ExtraStack[BUILD_EXTRA_STACK_SIZE] - 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();
// 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();
lpt_setup();
serial_setup();
floppy_setup();
ata_setup();
ahci_setup();
cbfs_payload_setup();
ramdisk_setup();
virtio_blk_setup();
virtio_scsi_setup();
lsi_scsi_setup();
esp_scsi_setup();
megasas_setup();
}
static void
platform_hardware_setup(void)
{
// Enable CPU caching
setcr0(getcr0() & ~(CR0_CD|CR0_NW));
// Make sure legacy DMA isn't running.
dma_setup();
// Init base pc hardware.
pic_setup();
mathcp_setup();
timer_setup();
clock_setup();
// Platform specific setup
qemu_platform_setup();
coreboot_platform_setup();
}
void
prepareboot(void)
{
// Run BCVs
bcv_prepboot();
// Finalize data structures before boot
cdrom_prepboot();
pmm_prepboot();
malloc_prepboot();
memmap_prepboot();
// 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 optionrom threading)
if (CONFIG_THREAD_OPTIONROMS)
device_hardware_setup();
// Run vga option rom
vgarom_setup();
// Do hardware initialization (if running synchronously)
if (!CONFIG_THREAD_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);
// Symbols populated by the build.
extern u8 code32flat_start[];
extern u8 _reloc_min_align;
extern u32 _reloc_abs_start[], _reloc_abs_end[];
extern u32 _reloc_rel_start[], _reloc_rel_end[];
extern u32 _reloc_init_start[], _reloc_init_end[];
extern u8 code32init_start[], code32init_end[];
// Allocate space for init code.
u32 initsize = code32init_end - code32init_start;
u32 codealign = (u32)&_reloc_min_align;
void *codedest = memalign_tmp(codealign, initsize);
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"
, code32init_start, codedest, initsize);
s32 delta = codedest - (void*)code32init_start;
memcpy(codedest, code32init_start, initsize);
updateRelocs(codedest, _reloc_abs_start, _reloc_abs_end, delta);
updateRelocs(codedest, _reloc_rel_start, _reloc_rel_end, -delta);
updateRelocs(code32flat_start, _reloc_init_start, _reloc_init_end, delta);
if (f >= (void*)code32init_start && f < (void*)code32init_end)
func = f + delta;
// Call function in relocated code.
barrier();
func(arg);
}
// Setup for code relocation and then relocate.
void VISIBLE32INIT
dopost(void)
{
// 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;
debug_serial_preinit();
dprintf(1, "Start bios (version %s)\n", VERSION);
// 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();
}