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042F8BFA1B0EF93B
@ -6,7 +6,7 @@ lw_project(lcrash
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)
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lw_add_executable(lcrash
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SOURCES lcrash.c
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SOURCES lcrash.c efi/memmap.c
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)
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add_executable(lcrashld IMPORTED)
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set_property(TARGET lcrashld PROPERTY IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/lcrash.ld)
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@ -15,3 +15,4 @@ set_property(TARGET lcrash PROPERTY LINK_DEPENDS
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$<TARGET_FILE:LindowsCompilerSpec>
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)
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set_property(TARGET lcrash PROPERTY LINK_OPTIONS -nostdlib -Wl,-T,${CMAKE_CURRENT_SOURCE_DIR}/lcrash.ld)
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target_compile_options(lcrash PRIVATE -ggdb)
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109
lcrash/lcrash.c
109
lcrash/lcrash.c
@ -1,4 +1,6 @@
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#include "lnxboot.h"
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#include "efi/types.h"
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#include "efi/memmap.h"
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extern void _start();
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@ -7,7 +9,7 @@ extern void _start();
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[[gnu::aligned(1)]]
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[[gnu::unavailable("not present at runtime. use setup_info instead")]]
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struct setup_info bzhead = {
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.setup_sects = 1, // 1 512-byte sector
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.setup_sects = 2, // 1 512-byte sector
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.boot_flag = 0xAA55,
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.syssize = 16,
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.jump_instruction = 0xEB,
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@ -16,7 +18,7 @@ struct setup_info bzhead = {
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.version = 0x020F,
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.loadflags = 0x01, // LOADED_HIGH,
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.kernel_alignment = 1,
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.relocatable_kernel = 1,
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.relocatable_kernel = 0,
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.xloadflags = 0x13, // XLF_KERNEL_64 | XLF_CAN_BE_LOADED_ABOVE_4G | XLF_5LEVEL
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.cmdline_size = 255, // max command line size
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.init_size = 0x10000 // we dont need THAT much memory
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@ -60,8 +62,31 @@ void serial_put_formatted_u64(u64 v) {
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}
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}
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[[gnu::section(".text._start"), gnu::naked]]
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/**
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* We can't do anything, just hang.
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*/
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[[noreturn, gnu::naked]]
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void Hang() {
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// This should make us hang
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asm volatile (
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" cli\n"
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"1: hlt\n"
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" jmp 1b"
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);
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}
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/**
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* Congratulations, you panicked twice!
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*/
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[[noreturn]]
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void Panic(const char* message) {
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// We don't even do anything with the message, but it's nice to have just in case.
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Hang();
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}
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[[gnu::section(".text._start"), gnu::naked, gnu::no_reorder]]
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extern void _start() {
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asm ("jmp _start");
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asm ( // grab the setup_info and boot_params locations
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"mov %%rsi, %1\n"
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"mov %%rsi, %0\n"
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@ -72,27 +97,70 @@ extern void _start() {
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asm ("jmp entry");
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}
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[[gnu::section(".text._start")]]
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c16* FirmwareVendor = 0;
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/**
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* we're in some kind of purgatory between booted and not booted, a lot of devices are currently initialized from the previous
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* kernel, but we have no idea where they are, what they are, or how to use them. all we have is the stuff in setup_info and
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* boot_params, and whatever we can salvage from the crashed kernel.
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*/
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[[gnu::section(".text._start"), gnu::no_reorder]]
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void entry() {
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// get the zero page
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//boot_params = (struct boot_params*)(
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// 0x202 - 0x1f1
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// + setup_info->jump_offset
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// + (u64)setup_info);
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// get command line from kernel. we likely won't use it, but its nice to have.
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u8* cmdline_ptr = (u8*)((u64)setup_info->cmd_line_ptr | ((u64)boot_params->ext_cmd_line_ptr << 32));
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// do we have efi?
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struct EfiSystemTable* systab_ptr = 0;
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if (boot_params) {
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systab_ptr = (struct EfiSystemTable*)(
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(u64)boot_params->efi_info.EfiSystemTable |
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((u64)boot_params->efi_info.EfiSystemTableHigh << 32)
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);
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// orignally we would try to import the serial port from the kernel (see kexec tools)
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// as you can see, we gave up!
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// serial_port = (unsigned short)*(long*)&serial_base;
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serial_port = 0x3f8;
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EfiLoadStoredMemoryMap(
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(struct EfiMemoryDescription*)(
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(u64)boot_params->efi_info.EfiMemoryMap |
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((u64)boot_params->efi_info.EfiMemoryMapHigh << 32)
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), // this might be 0, we should probably check ---------------V
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boot_params->efi_info.EfiMemoryMapSize / boot_params->efi_info.EfiMemoryDescriptionSize,
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boot_params->efi_info.EfiMemoryDescriptionSize
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);
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// construct pointers
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u8* cmdline_ptr = (u8*)((u64)setup_info->cmd_line_ptr | ((u64)boot_params->ext_cmd_line_ptr << 32));
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FirmwareVendor = EfiTranslatePointer(systab_ptr->FirmwareVendor);
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while (1) {
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volatile char* a = FirmwareVendor;
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}
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}
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// check out command line
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serial_puts(cmdline_ptr);
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serial_putc('\r');
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serial_putc('\n');
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// -- find acpi --
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struct AcpiRSDP* AcpiRSDP = 0;
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// check bootparams
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if (boot_params->acpi_rsdp_addr) AcpiRSDP = boot_params->acpi_rsdp_addr;
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// check efi
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if (!AcpiRSDP && systab_ptr && systab_ptr->NumberOfTableEntries) {
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volatile void* ConfigurationTable = EfiTranslatePointer(systab_ptr->ConfigurationTable);
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}
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// we're playing where's waldo with this stupid fucking tableS
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if (!AcpiRSDP) {
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for (struct AcpiRSDP* addr = 0x00000000; addr < 0x000FFFFF; addr = (void*)addr + 16) {
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if (addr->Signature[0] == 'R' && addr->Signature[1] == 'S'
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&& addr->Signature[2] == 'D' && addr->Signature[3] == ' '
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&& addr->Signature[4] == 'P' && addr->Signature[5] == 'T'
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&& addr->Signature[6] == 'R' && addr->Signature[7] == ' ') {
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AcpiRSDP = addr;
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break;
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}
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}
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}
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if (!AcpiRSDP) Panic("Failed to find ACPI RSDP");
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// do we have acpi?
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asm volatile ("ljmp 0");
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// we dont have the privilege of getting a rodata segment. any reads off our stack cause a triple fault
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// for some fucking reason. allocate our strings and shit on the stack.
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//char s_you_fucked_up[] = "!!! YOU FUCKED UP !!!\n";
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@ -124,6 +192,5 @@ void entry() {
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// serial_puts(bzhead.cmd_line_ptr);
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// Die.
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asm ("cli");
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asm ("hlt");
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Panic("Nothing left to do.");
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}
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@ -1,24 +1,36 @@
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OUTPUT_FORMAT(elf64-x86-64)
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ENTRY(_start)
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MEMORY {
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code (rx) : ORIGIN = 0x0dfe8000, LENGTH = 0x00001000
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data (rw) : ORIGIN = 0x0dff0000, LENGTH = 0x00001000
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}
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SECTIONS {
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.lnxhead 0x01f1 : ALIGN(1) {
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*(.lnxhead);
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}
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.rodata 0x900000 : ALIGN(1) {
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.rodata : ALIGN(1) {
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*(.rodata);
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}
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} > data
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.text._start 0x80000000 : ALIGN(1) {
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/* this section helps us to coerce the linker into not breaking down because of big addresses */
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.text._start 0xdfe8000 : ALIGN(1) {
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*(.text._start);
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}
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} > code
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.text : ALIGN(512) { *(.text); }
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.text : ALIGN(512) { *(.text); } > code
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.bss : { *(.bss); }
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.kernel_imports 0xFFFFFFFF : {
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*(.kernel_imports);
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}
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.debug_info 0 : { *(.debug_info); }
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.debug_abbrev 0 : { *(.debug_abbrev); }
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.debug_aranges 0 : { *(.debug_aranges); }
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.debug_rnglists 0 : { *(.debug_rnglists); }
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.debug_line 0 : { *(.debug_line); }
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.debug_str 0 : { *(.debug_str); }
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.debug_line_str 0 : { *(.debug_line_str); }
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/DISCARD/ : {
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*(*);
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@ -1,9 +1,7 @@
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#pragma once
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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typedef unsigned long long u64;
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#include "types.h"
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#include "acpi/acpi.h"
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struct [[gnu::packed]] setup_info {
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u8 setup_sects;
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@ -61,13 +59,14 @@ struct [[gnu::packed]] screen_info {
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u16 reserved2;
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u8 orig_video_lines;
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u8 orig_video_isVGA;
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u8 orig_video_points;
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u16 orig_video_points;
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// linear frame buffer
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u16 lfb_width;
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u16 lfb_height;
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u16 lfb_depth;
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u32 lfb_base;
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u32 lfb_size;
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u16 cl_magic;
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u16 cl_offset;
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u16 lfb_linelength;
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@ -79,8 +78,8 @@ struct [[gnu::packed]] screen_info {
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u8 blue_pos;
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u8 reserved_size;
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u8 reserved_pos;
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u8 vesapm_seg;
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u8 vesapm_off;
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u16 vesapm_seg;
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u16 vesapm_off;
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u16 pages;
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u16 vesa_attributes;
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u32 capabilities;
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@ -106,11 +105,20 @@ struct [[gnu::packed]] edid_info {
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};
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struct [[gnu::packed]] efi_info {
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u8 pad[0x20];
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u32 EfiLoaderSignature;
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u32 EfiSystemTable;
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u32 EfiMemoryDescriptionSize;
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u32 EfiMemoryDescriptionVersion;
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u32 EfiMemoryMap;
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u32 EfiMemoryMapSize;
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u32 EfiSystemTableHigh;
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u32 EfiMemoryMapHigh;
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};
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struct [[gnu::packed]] e820_entry {
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u8 pad;
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u64 base;
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u64 length;
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u32 type;
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};
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struct [[gnu::packed]] edd_info {
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@ -123,8 +131,8 @@ struct [[gnu::packed]] boot_params {
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u8 reserved0[0x4];
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void* tboot_addr;
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struct ist_info ist_info;
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void* acpi_rsdp_addr;
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u8 reserved1[0x2];
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struct acpi_rsdp* acpi_rsdp_addr;
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u8 reserved1[0x8];
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u8 hd0_info[0x10];
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u8 hd1_info[0x10];
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struct sys_desc_table sys_desc_table;
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@ -136,7 +144,7 @@ struct [[gnu::packed]] boot_params {
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/// cmd_line_ptr high 32 bits
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u32 ext_cmd_line_ptr;
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u8 reserved2[0x70];
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void* cc_blob_address;
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u32 cc_blob_address;
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struct edid_info edid_info;
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struct efi_info efi_info;
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u32 alt_mem_k;
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@ -150,7 +158,7 @@ struct [[gnu::packed]] boot_params {
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u8 sentinel;
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u8 reserved4[0xa0]; // setup_info lives here!
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u8 edd_mbr_sig_buffer[0x40];
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u8 e20_table[0xa00];
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struct e820_entry e820_table[128];
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u8 reserved5[0x30];
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u8 eddbuf[0x1ec];
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};
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