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