diff options
Diffstat (limited to 'roms/seabios/src/post.c')
| -rw-r--r-- | roms/seabios/src/post.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/roms/seabios/src/post.c b/roms/seabios/src/post.c new file mode 100644 index 000000000..f93106a1c --- /dev/null +++ b/roms/seabios/src/post.c @@ -0,0 +1,337 @@ +// 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(0x05, FUNC16(entry_05)); + 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(); + sercon_setup(); + enable_vga_console(); + + // 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(); +} |