338 lines
8.5 KiB
C
338 lines
8.5 KiB
C
// 32bit code to Power On Self Test (POST) a machine.
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//
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// Copyright (C) 2008-2013 Kevin O'Connor <kevin@koconnor.net>
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// Copyright (C) 2002 MandrakeSoft S.A.
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//
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// This file may be distributed under the terms of the GNU LGPLv3 license.
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#include "biosvar.h" // SET_BDA
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#include "block.h" // block_setup
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#include "bregs.h" // struct bregs
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#include "config.h" // CONFIG_*
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#include "e820map.h" // e820_add
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#include "fw/paravirt.h" // qemu_cfg_preinit
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#include "fw/xen.h" // xen_preinit
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#include "hw/pic.h" // pic_setup
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#include "hw/ps2port.h" // ps2port_setup
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#include "hw/rtc.h" // rtc_write
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#include "hw/serialio.h" // serial_debug_preinit
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#include "hw/usb.h" // usb_setup
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#include "malloc.h" // malloc_init
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#include "memmap.h" // SYMBOL
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#include "output.h" // dprintf
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#include "string.h" // memset
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#include "util.h" // kbd_init
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#include "tcgbios.h" // tpm_*
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/****************************************************************
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* BIOS initialization and hardware setup
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****************************************************************/
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static void
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ivt_init(void)
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{
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dprintf(3, "init ivt\n");
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// Initialize all vectors to the default handler.
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int i;
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for (i=0; i<256; i++)
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SET_IVT(i, FUNC16(entry_iret_official));
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// Initialize all hw vectors to a default hw handler.
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for (i=BIOS_HWIRQ0_VECTOR; i<BIOS_HWIRQ0_VECTOR+8; i++)
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SET_IVT(i, FUNC16(entry_hwpic1));
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for (i=BIOS_HWIRQ8_VECTOR; i<BIOS_HWIRQ8_VECTOR+8; i++)
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SET_IVT(i, FUNC16(entry_hwpic2));
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// Initialize software handlers.
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SET_IVT(0x02, FUNC16(entry_02));
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SET_IVT(0x05, FUNC16(entry_05));
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SET_IVT(0x10, FUNC16(entry_10));
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SET_IVT(0x11, FUNC16(entry_11));
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SET_IVT(0x12, FUNC16(entry_12));
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SET_IVT(0x13, FUNC16(entry_13_official));
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SET_IVT(0x14, FUNC16(entry_14));
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SET_IVT(0x15, FUNC16(entry_15_official));
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SET_IVT(0x16, FUNC16(entry_16));
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SET_IVT(0x17, FUNC16(entry_17));
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SET_IVT(0x18, FUNC16(entry_18));
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SET_IVT(0x19, FUNC16(entry_19_official));
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SET_IVT(0x1a, FUNC16(entry_1a_official));
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SET_IVT(0x40, FUNC16(entry_40));
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// INT 60h-66h reserved for user interrupt
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for (i=0x60; i<=0x66; i++)
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SET_IVT(i, SEGOFF(0, 0));
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// set vector 0x79 to zero
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// this is used by 'gardian angel' protection system
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SET_IVT(0x79, SEGOFF(0, 0));
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}
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static void
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bda_init(void)
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{
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dprintf(3, "init bda\n");
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struct bios_data_area_s *bda = MAKE_FLATPTR(SEG_BDA, 0);
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memset(bda, 0, sizeof(*bda));
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int esize = EBDA_SIZE_START;
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u16 ebda_seg = EBDA_SEGMENT_START;
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if (!CONFIG_MALLOC_UPPERMEMORY)
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ebda_seg = FLATPTR_TO_SEG(ALIGN_DOWN(SYMBOL(final_varlow_start), 1024)
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- EBDA_SIZE_START*1024);
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SET_BDA(ebda_seg, ebda_seg);
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SET_BDA(mem_size_kb, ebda_seg / (1024/16));
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// Init ebda
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struct extended_bios_data_area_s *ebda = get_ebda_ptr();
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memset(ebda, 0, sizeof(*ebda));
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ebda->size = esize;
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e820_add((u32)ebda, BUILD_LOWRAM_END-(u32)ebda, E820_RESERVED);
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// Init extra stack
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StackPos = &ExtraStack[BUILD_EXTRA_STACK_SIZE] - SYMBOL(zonelow_base);
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}
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void
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interface_init(void)
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{
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// Running at new code address - do code relocation fixups
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malloc_init();
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// Setup romfile items.
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qemu_cfg_init();
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coreboot_cbfs_init();
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multiboot_init();
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// Setup ivt/bda/ebda
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ivt_init();
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bda_init();
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// Other interfaces
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boot_init();
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bios32_init();
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pmm_init();
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pnp_init();
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kbd_init();
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mouse_init();
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}
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// Initialize hardware devices
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void
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device_hardware_setup(void)
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{
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usb_setup();
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ps2port_setup();
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block_setup();
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lpt_setup();
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serial_setup();
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cbfs_payload_setup();
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}
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static void
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platform_hardware_setup(void)
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{
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// Make sure legacy DMA isn't running.
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dma_setup();
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// Init base pc hardware.
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pic_setup();
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thread_setup();
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mathcp_setup();
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// Platform specific setup
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qemu_platform_setup();
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coreboot_platform_setup();
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// Setup timers and periodic clock interrupt
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timer_setup();
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clock_setup();
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// Initialize TPM
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tpm_setup();
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}
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void
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prepareboot(void)
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{
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// Change TPM phys. presence state befor leaving BIOS
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tpm_prepboot();
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// Run BCVs
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bcv_prepboot();
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// Finalize data structures before boot
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cdrom_prepboot();
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pmm_prepboot();
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malloc_prepboot();
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e820_prepboot();
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HaveRunPost = 2;
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// Setup bios checksum.
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BiosChecksum -= checksum((u8*)BUILD_BIOS_ADDR, BUILD_BIOS_SIZE);
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}
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// Begin the boot process by invoking an int0x19 in 16bit mode.
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void VISIBLE32FLAT
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startBoot(void)
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{
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// Clear low-memory allocations (required by PMM spec).
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memset((void*)BUILD_STACK_ADDR, 0, BUILD_EBDA_MINIMUM - BUILD_STACK_ADDR);
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dprintf(3, "Jump to int19\n");
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struct bregs br;
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memset(&br, 0, sizeof(br));
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br.flags = F_IF;
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call16_int(0x19, &br);
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}
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// Main setup code.
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static void
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maininit(void)
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{
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// Initialize internal interfaces.
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interface_init();
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// Setup platform devices.
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platform_hardware_setup();
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// Start hardware initialization (if threads allowed during optionroms)
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if (threads_during_optionroms())
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device_hardware_setup();
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// Run vga option rom
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vgarom_setup();
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sercon_setup();
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enable_vga_console();
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// Do hardware initialization (if running synchronously)
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if (!threads_during_optionroms()) {
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device_hardware_setup();
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wait_threads();
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}
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// Run option roms
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optionrom_setup();
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// Allow user to modify overall boot order.
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interactive_bootmenu();
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wait_threads();
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// Prepare for boot.
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prepareboot();
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// Write protect bios memory.
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make_bios_readonly();
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// Invoke int 19 to start boot process.
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startBoot();
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}
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/****************************************************************
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* POST entry and code relocation
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****************************************************************/
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// Update given relocs for the code at 'dest' with a given 'delta'
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static void
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updateRelocs(void *dest, u32 *rstart, u32 *rend, u32 delta)
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{
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u32 *reloc;
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for (reloc = rstart; reloc < rend; reloc++)
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*((u32*)(dest + *reloc)) += delta;
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}
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// Relocate init code and then call a function at its new address.
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// The passed function should be in the "init" section and must not
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// return.
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void __noreturn
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reloc_preinit(void *f, void *arg)
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{
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void (*func)(void *) __noreturn = f;
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if (!CONFIG_RELOCATE_INIT)
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func(arg);
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// Allocate space for init code.
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u32 initsize = SYMBOL(code32init_end) - SYMBOL(code32init_start);
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u32 codealign = SYMBOL(_reloc_min_align);
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void *codedest = memalign_tmp(codealign, initsize);
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void *codesrc = VSYMBOL(code32init_start);
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if (!codedest)
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panic("No space for init relocation.\n");
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// Copy code and update relocs (init absolute, init relative, and runtime)
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dprintf(1, "Relocating init from %p to %p (size %d)\n"
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, codesrc, codedest, initsize);
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s32 delta = codedest - codesrc;
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memcpy(codedest, codesrc, initsize);
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updateRelocs(codedest, VSYMBOL(_reloc_abs_start), VSYMBOL(_reloc_abs_end)
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, delta);
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updateRelocs(codedest, VSYMBOL(_reloc_rel_start), VSYMBOL(_reloc_rel_end)
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, -delta);
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updateRelocs(VSYMBOL(code32flat_start), VSYMBOL(_reloc_init_start)
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, VSYMBOL(_reloc_init_end), delta);
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if (f >= codesrc && f < VSYMBOL(code32init_end))
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func = f + delta;
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// Call function in relocated code.
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barrier();
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func(arg);
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}
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// Runs after all code is present and prior to any modifications
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void
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code_mutable_preinit(void)
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{
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if (HaveRunPost)
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// Already run
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return;
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// Setup reset-vector entry point (controls legacy reboots).
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rtc_write(CMOS_RESET_CODE, 0);
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barrier();
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HaveRunPost = 1;
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barrier();
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}
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// Setup for code relocation and then relocate.
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void VISIBLE32INIT
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dopost(void)
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{
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code_mutable_preinit();
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// Detect ram and setup internal malloc.
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qemu_preinit();
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coreboot_preinit();
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malloc_preinit();
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// Relocate initialization code and call maininit().
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reloc_preinit(maininit, NULL);
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}
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// Entry point for Power On Self Test (POST) - the BIOS initilization
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// phase. This function makes the memory at 0xc0000-0xfffff
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// read/writable and then calls dopost().
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void VISIBLE32FLAT
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handle_post(void)
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{
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if (!CONFIG_QEMU && !CONFIG_COREBOOT)
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return;
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serial_debug_preinit();
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debug_banner();
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// Check if we are running under Xen.
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xen_preinit();
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// Allow writes to modify bios area (0xf0000)
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make_bios_writable();
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// Now that memory is read/writable - start post process.
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dopost();
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}
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