rulimine/stage23/protos/bootboot.c

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#include "lib/gterm.h"
#include "sys/smp.h"
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
#include <protos/bootboot.h>
#include <lib/libc.h>
#include <lib/elf.h>
#include <lib/blib.h>
#include <lib/acpi.h>
#include <lib/config.h>
#include <lib/time.h>
#include <lib/print.h>
#include <lib/real.h>
#include <lib/uri.h>
#include <lib/fb.h>
#include <lib/term.h>
#include <sys/pic.h>
#include <sys/cpu.h>
#include <sys/gdt.h>
#include <sys/idt.h>
#include <sys/lapic.h>
#include <fs/file.h>
#include <mm/vmm.h>
#include <mm/pmm.h>
#include <drivers/vga_textmode.h>
__attribute__((noreturn)) void bootboot_spinup(
pagemap_t *pagemap,
uint64_t entry_point, uint64_t stack,
size_t numcores, struct smp_information* cores);
struct elf64_hdr {
uint8_t ident[16];
uint16_t type;
uint16_t machine;
uint32_t version;
uint64_t entry;
uint64_t phoff;
uint64_t shoff;
uint32_t flags;
uint16_t hdr_size;
uint16_t phdr_size;
uint16_t ph_num;
uint16_t shdr_size;
uint16_t sh_num;
uint16_t shstrndx;
};
struct elf64_shdr {
uint32_t sh_name;
uint32_t sh_type;
uint64_t sh_flags;
uint64_t sh_addr;
uint64_t sh_offset;
uint64_t sh_size;
uint32_t sh_link;
uint32_t sh_info;
uint64_t sh_addralign;
uint64_t sh_entsize;
};
struct elf64_sym {
uint32_t st_name;
uint8_t st_info;
uint8_t st_other;
uint16_t st_shndx;
uint64_t st_value;
uint64_t st_size;
};
#define BOOTBOOT_FB 0xfffffffffc000000
#define BOOTBOOT_INFO 0xffffffffffe00000
#define BOOTBOOT_ENV 0xffffffffffe01000
#define BOOTBOOT_CORE 0xffffffffffe02000
void bootboot_load(char *config, void *efi_system_table) {
uint64_t fb_vaddr = BOOTBOOT_FB;
uint64_t struct_vaddr = BOOTBOOT_INFO;
uint64_t env_vaddr = BOOTBOOT_ENV;
uint64_t init_stack_size = 1024;
/// Config ///
char *kernel_path = config_get_value(config, 0, "KERNEL_PATH");
if (kernel_path == NULL)
panic("bootboot: KERNEL_PATH not specified");
char *ramdisk = config_get_value(config, 0, "RAMDISK");
if (ramdisk == NULL) {
print("bootboot: no ramdisk!\n");
}
/// Kernel loading code ///
print("bootboot: Loading kernel `%s`...\n", kernel_path);
struct file_handle* kernel_file;
if ((kernel_file = uri_open(kernel_path)) == NULL)
panic("bootboot: Failed to open kernel with path `%s`. Is the path correct?\n", kernel_path);
uint8_t* kernel = freadall(kernel_file, MEMMAP_KERNEL_AND_MODULES);
/// Funky macros ///
#define KOFFSET(type, off) (type)&kernel[(off)]
#define ESECTION(idx) KOFFSET(struct elf64_shdr*, elf_header->shoff + elf_header->shdr_size * (idx))
/// Bootboot symbols ///
struct elf64_hdr* elf_header = (struct elf64_hdr*)kernel;
struct elf64_shdr* section_header_strings_section = ESECTION(elf_header->shstrndx);
char* section_header_strings = KOFFSET(char*, section_header_strings_section->sh_offset);
struct elf64_shdr* symbol_table;
struct elf64_shdr* string_table;
for(uint32_t i = 0; i < elf_header->sh_num; i++){
struct elf64_shdr* section_header = ESECTION(i);
char* secname = &section_header_strings[section_header->sh_name];
if(!strcmp(secname, ".symtab")) symbol_table = section_header;
if(!strcmp(secname, ".strtab")) string_table = section_header;
}
if (!symbol_table || !string_table) {
print("bootboot: warning: no symbol/string tables in the ELF!");
} else {
struct elf64_sym* symbols = KOFFSET(struct elf64_sym*, symbol_table->sh_offset);
char* symbol_strings = KOFFSET(char*, string_table->sh_offset);
for (uint32_t i = 0, symcount = symbol_table->sh_size / sizeof(struct elf64_sym);i < symcount;i++) {
char* symbol = &symbol_strings[symbols[i].st_name];
uint64_t symaddr = symbols[i].st_value;
if(!strcmp(symbol, "bootboot")) struct_vaddr = symaddr;
if(!strcmp(symbol, "environment")) env_vaddr = symaddr;
if(!strcmp(symbol, "fb")) fb_vaddr = symaddr;
if(!strcmp(symbol, "initstack")) init_stack_size = symaddr;
}
}
print("bootboot: mapping struct to %X", struct_vaddr);
uint64_t entry, top, slide, rangecount, physbase, virtbase = 0;
struct elf_range* ranges;
/// Memory mappings ///
pagemap_t pmap = new_pagemap(4);
/// Load kernel ///
{
if (elf64_load(
kernel, &entry, &top, &slide, MEMMAP_KERNEL_AND_MODULES,
false, false, &ranges, &rangecount, true, &physbase, &virtbase)) {
panic("bootboot: elf64 load failed");
}
for (uint64_t mapvirt = virtbase, mapphys = physbase; mapphys < top;mapvirt += 0x1000, mapphys += 0x1000) {
map_page(pmap, mapvirt, mapphys, VMM_FLAG_PRESENT | VMM_FLAG_WRITE, false);
}
}
BOOTBOOT* bootboot = (BOOTBOOT*)ext_mem_alloc_type_aligned(4096, MEMMAP_BOOTLOADER_RECLAIMABLE, 4096);
map_page(pmap, struct_vaddr, (uint64_t)bootboot, VMM_FLAG_PRESENT | VMM_FLAG_WRITE, false);
/// Environment ///
{
char* env = (char*)ext_mem_alloc_type_aligned(4096, MEMMAP_BOOTLOADER_RECLAIMABLE, 4096);
map_page(pmap, env_vaddr, (uint64_t)env, VMM_FLAG_PRESENT | VMM_FLAG_WRITE, false);
uint32_t index = 0, offset = 0;
char* cfgent = NULL;
do {
cfgent = config_get_value(config, index++, "BOOTBOOT_ENV");
if (cfgent) {
uint32_t off = strlen(cfgent);
if (offset + off + 1 > 4095) {
panic("Too much config options! we only have 4k of env vars!");
}
memcpy(&env[offset], cfgent, off);
offset += off;
env[offset++] = '\n';
}
} while (cfgent);
cfgent[offset] = 0;
}
for (uint64_t i = 0; i < 0x400000000; i += 0x200000) {
map_page(pmap, i, i, 0x03, true);
}
/// Framebuffer init ///
size_t fbwidth = 0, fbheight = 0, fbbpp = 32;
struct fb_info fbi;
char *resolution = config_get_value(config, 0, "RESOLUTION");
if (resolution != NULL)
parse_resolution(&fbwidth, &fbheight, &fbbpp, resolution);
term_deinit();
fb_init(&fbi, fbwidth, fbheight, fbbpp);
uint64_t fb_size = fbi.framebuffer_height * fbi.framebuffer_pitch;
for (uint64_t current = 0;current < fb_size;current += 0x1000) {
map_page(pmap, fb_vaddr + current, fbi.framebuffer_addr + current, VMM_FLAG_PRESENT | VMM_FLAG_WRITE, false);
}
/// Ramdisk loading ///
uint64_t ramdisk_start = 0, ramdisk_size = 0;
if (ramdisk) {
struct file_handle* ramdisk_file;
if ((ramdisk_file = uri_open(ramdisk)) == NULL)
panic("bootboot: Failed to open ramdisk with path `%s`. Is the path correct?\n", ramdisk);
uint8_t* ramdisk_data = freadall(ramdisk_file, MEMMAP_KERNEL_AND_MODULES);
ramdisk_size = ramdisk_file->size;
ramdisk_start = (uint64_t)ramdisk_data;
}
/// Header info ///
memcpy(bootboot->magic, "BOOT", 4);
#if bios
bootboot->protocol = 2 | (0 << 2);
#elif uefi
bootboot->protocol = 2 | (1 << 2);
#else
#error bootboot: unknown target, not uefi or bios, what the fuck?
#endif
/// SMP info ///
size_t numcores;
uint32_t bsplapic;
struct smp_information* cores;
init_smp(0, (void**)&cores, &numcores, &bsplapic, true, false, pmap, false, false);
bootboot->numcores = numcores;
bootboot->bspid = bsplapic;
for (size_t i = 0;i < numcores;i++) {
cores[i].stack_addr = ((uint64_t)ext_mem_alloc(init_stack_size)) + init_stack_size;
}
/// Time stubs ///
uint32_t year, month, day, hour, minute, second;
bootboot_time(&day, &month, &year, &second, &minute, &hour);
print("bootboot: todo/help wanted: if you feel like adding support for weird time bullshit, please contribute\n");
bootboot->timezone = 0;
bootboot->datetime[0] = int_to_bcd(year / 100);
bootboot->datetime[1] = int_to_bcd(year % 100);
bootboot->datetime[2] = int_to_bcd(month);
bootboot->datetime[3] = int_to_bcd(day);
bootboot->datetime[4] = int_to_bcd(hour);
bootboot->datetime[5] = int_to_bcd(minute);
bootboot->datetime[6] = int_to_bcd(second);
bootboot->datetime[7] = 0;
/// Ramdisk ///
bootboot->initrd_ptr = ramdisk_start;
bootboot->initrd_size = ramdisk_size;
/// Framebuffer ///
bootboot->fb_ptr = fbi.framebuffer_addr;
bootboot->fb_size = fb_size;
bootboot->fb_width = fbi.framebuffer_width;
bootboot->fb_height = fbi.framebuffer_height;
bootboot->fb_scanline = fbi.framebuffer_pitch;
bootboot->fb_type = 1;
/// SMBIOS and ACPI ///
uint64_t smbios_entry_32 = 0, smbios_entry_64 = 0;
acpi_get_smbios((void **)&smbios_entry_32, (void **)&smbios_entry_64);
bootboot->arch.x86_64.acpi_ptr = (uint64_t)(size_t)acpi_get_rsdp();
if (smbios_entry_64) bootboot->arch.x86_64.smbi_ptr = smbios_entry_64;
else if (smbios_entry_32) bootboot->arch.x86_64.smbi_ptr = smbios_entry_32;
else bootboot->arch.x86_64.smbi_ptr = 0;
bootboot->arch.x86_64.efi_ptr = (uint64_t)efi_system_table;
bootboot->arch.x86_64.mp_ptr = 0;
/// Memory map ///
{
size_t mmapent;
struct e820_entry_t* e820e = get_memmap(&mmapent);
if (mmapent > 248) {
term_reinit();
panic("Too much memory entries! our god bzt decided that %d entries is too much, max is 248", mmapent);
}
for (uint32_t i = 0;i < mmapent;i++) {
uint32_t btype = 0;
if (e820e[i].type == 1) btype = 1;
if (e820e[i].type == 3) btype = 2;
if (e820e[i].type == 4) btype = 2;
bootboot->mmap[i].size = (e820e[i].length & 0xF) | btype;
bootboot->mmap[i].ptr = e820e[i].base;
}
bootboot->size = 128 + mmapent * 16;
}
/// Late framebuffer init ///
memset((void*)(size_t)fbi.framebuffer_addr, 0, fb_size);
/// Spinup ///
bootboot_spinup(&pmap, entry, cores[0].stack_addr, numcores, cores);
}
__attribute__((noreturn)) void bootboot_spinup_32(
uint32_t pagemap_top_lv,
uint32_t entry_point_lo, uint32_t entry_point_hi,
uint32_t stack_lo, uint32_t stack_hi);
__attribute__((noreturn)) void bootboot_spinup(
pagemap_t *pagemap,
uint64_t entry_point, uint64_t stack,
size_t numcores, struct smp_information* cores) {
#if bios == 1
// If we're going 64, we might as well call this BIOS interrupt
// to tell the BIOS that we are entering Long Mode, since it is in
// the specification.
struct rm_regs r = {0};
r.eax = 0xec00;
r.ebx = 0x02; // Long mode only
rm_int(0x15, &r, &r);
#endif
pic_mask_all();
io_apic_mask_all();
irq_flush_type = IRQ_PIC_APIC_FLUSH;
for (size_t i = 0;i < numcores;i++) {
cores[i].extra_argument = 0;
cores[i].goto_address = entry_point;
}
common_spinup(bootboot_spinup_32, 10,
(uint32_t)(uintptr_t)pagemap->top_level,
(uint32_t)entry_point, (uint32_t)(entry_point >> 32),
(uint32_t)stack, (uint32_t)(stack >> 32));
}