450 lines
16 KiB
C
450 lines
16 KiB
C
#if defined (__x86_64__) || defined (__i386__)
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#include <stdint.h>
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#include <stddef.h>
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#include <stdnoreturn.h>
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#include <protos/multiboot1.h>
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#include <protos/multiboot.h>
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#include <config.h>
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#include <lib/libc.h>
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#include <lib/elf.h>
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#include <lib/misc.h>
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#include <lib/config.h>
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#include <lib/print.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 <lib/elsewhere.h>
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#include <sys/pic.h>
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#include <sys/cpu.h>
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#include <sys/idt.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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#define LIMINE_BRAND "Limine " LIMINE_VERSION
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// Returns the size required to store the multiboot info.
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static size_t get_multiboot1_info_size(
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char *cmdline,
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size_t modules_count, size_t modules_cmdlines_size,
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uint32_t section_entry_size, uint32_t section_num
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) {
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return ALIGN_UP(sizeof(struct multiboot1_info), 16) + // base structure
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ALIGN_UP(strlen(cmdline) + 1, 16) + // cmdline
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ALIGN_UP(sizeof(LIMINE_BRAND), 16) + // bootloader brand
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ALIGN_UP(sizeof(section_entry_size * section_num), 16) + // ELF info
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ALIGN_UP(sizeof(struct multiboot1_module) * modules_count, 16) + // modules count
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ALIGN_UP(modules_cmdlines_size, 16) + // modules command lines
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ALIGN_UP(sizeof(struct multiboot1_mmap_entry) * MEMMAP_MAX, 16); // memory map
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}
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static void *mb1_info_alloc(void **mb1_info_raw, size_t size) {
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void *ret = *mb1_info_raw;
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*mb1_info_raw += ALIGN_UP(size, 16);
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return ret;
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}
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noreturn void multiboot1_load(char *config, char *cmdline) {
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struct file_handle *kernel_file;
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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(true, "multiboot1: KERNEL_PATH not specified");
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print("multiboot1: Loading kernel `%#`...\n", kernel_path);
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if ((kernel_file = uri_open(kernel_path)) == NULL)
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panic(true, "multiboot1: Failed to open kernel with path `%#`. Is the path correct?", kernel_path);
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uint8_t *kernel = freadall(kernel_file, MEMMAP_KERNEL_AND_MODULES);
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size_t kernel_file_size = kernel_file->size;
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fclose(kernel_file);
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struct multiboot1_header header = {0};
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size_t header_offset = 0;
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for (header_offset = 0; header_offset < 8192; header_offset += 4) {
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uint32_t v = *(uint32_t *)(kernel+header_offset);
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if (v == MULTIBOOT1_HEADER_MAGIC) {
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memcpy(&header, kernel + header_offset, sizeof(header));
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break;
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}
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}
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if (header.magic != MULTIBOOT1_HEADER_MAGIC) {
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panic(true, "multiboot1: Invalid magic");
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}
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if (header.magic + header.flags + header.checksum)
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panic(true, "multiboot1: Header checksum is invalid");
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bool section_hdr_info_valid = false;
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struct elf_section_hdr_info section_hdr_info = {0};
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uint64_t entry_point;
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struct elsewhere_range *ranges;
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uint64_t ranges_count;
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if (header.flags & (1 << 16)) {
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if (header.load_addr > header.header_addr)
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panic(true, "multiboot1: Illegal load address");
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size_t load_size;
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if (header.load_end_addr)
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load_size = header.load_end_addr - header.load_addr;
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else
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load_size = kernel_file_size;
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uint32_t bss_size = 0;
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if (header.bss_end_addr) {
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uintptr_t bss_addr = header.load_addr + load_size;
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if (header.bss_end_addr < bss_addr)
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panic(true, "multiboot1: Illegal bss end address");
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bss_size = header.bss_end_addr - bss_addr;
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}
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size_t full_size = load_size + bss_size;
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void *elsewhere = ext_mem_alloc(full_size);
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memcpy(elsewhere, kernel + (header_offset
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- (header.header_addr - header.load_addr)), load_size);
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entry_point = header.entry_addr;
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ranges_count = 1;
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ranges = ext_mem_alloc(sizeof(struct elsewhere_range));
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ranges->elsewhere = (uintptr_t)elsewhere;
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ranges->target = header.load_addr;
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ranges->length = full_size;
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} else {
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int bits = elf_bits(kernel);
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switch (bits) {
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case 32:
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if (!elf32_load_elsewhere(kernel, &entry_point, &ranges, &ranges_count))
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panic(true, "multiboot1: ELF32 load failure");
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section_hdr_info = elf32_section_hdr_info(kernel);
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section_hdr_info_valid = true;
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break;
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case 64: {
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if (!elf64_load_elsewhere(kernel, &entry_point, &ranges, &ranges_count))
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panic(true, "multiboot1: ELF64 load failure");
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section_hdr_info = elf64_section_hdr_info(kernel);
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section_hdr_info_valid = true;
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break;
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}
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default:
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panic(true, "multiboot1: Invalid ELF file bitness");
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}
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}
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size_t n_modules;
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size_t modules_cmdlines_size = 0;
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for (n_modules = 0;; n_modules++) {
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struct conf_tuple conf_tuple = config_get_tuple(config, n_modules, "MODULE_PATH", "MODULE_STRING");
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if (!conf_tuple.value1) break;
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char *module_cmdline = conf_tuple.value2;
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if (!module_cmdline) module_cmdline = "";
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modules_cmdlines_size += ALIGN_UP(strlen(module_cmdline) + 1, 16);
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}
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size_t mb1_info_size = get_multiboot1_info_size(
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cmdline,
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n_modules,
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modules_cmdlines_size,
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section_hdr_info_valid ? section_hdr_info.section_entry_size : 0,
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section_hdr_info_valid ? section_hdr_info.num : 0
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);
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// Realloc elsewhere ranges to include mb1 info, modules, and elf sections
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struct elsewhere_range *new_ranges = ext_mem_alloc(sizeof(struct elsewhere_range) *
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(ranges_count
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+ 1 /* mb1 info range */
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+ n_modules
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+ (section_hdr_info_valid ? section_hdr_info.num : 0)));
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memcpy(new_ranges, ranges, sizeof(struct elsewhere_range) * ranges_count);
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pmm_free(ranges, sizeof(struct elsewhere_range) * ranges_count);
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ranges = new_ranges;
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// GRUB allocates boot info at 0x10000, *except* if the kernel happens
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// to overlap this region, then it gets moved to right after the
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// kernel, or whichever PHDR happens to sit at 0x10000.
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// Allocate it wherever, then move it to where GRUB puts it
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// afterwards.
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// Elsewhere append mb1 info *after* kernel but *before* modules.
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void *mb1_info_raw = ext_mem_alloc(mb1_info_size);
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uint64_t mb1_info_final_loc = 0x10000;
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if (!elsewhere_append(true /* flexible target */,
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ranges, &ranges_count,
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mb1_info_raw, &mb1_info_final_loc, mb1_info_size)) {
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panic(true, "multiboot1: Cannot allocate mb1 info");
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}
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size_t mb1_info_slide = (size_t)mb1_info_raw - mb1_info_final_loc;
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struct multiboot1_info *multiboot1_info =
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mb1_info_alloc(&mb1_info_raw, sizeof(struct multiboot1_info));
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if (section_hdr_info_valid == true) {
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multiboot1_info->elf_sect.num = section_hdr_info.num;
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multiboot1_info->elf_sect.size = section_hdr_info.section_entry_size;
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multiboot1_info->elf_sect.shndx = section_hdr_info.str_section_idx;
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void *sections = mb1_info_alloc(&mb1_info_raw,
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section_hdr_info.section_entry_size * section_hdr_info.num);
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multiboot1_info->elf_sect.addr = (uintptr_t)sections - mb1_info_slide;
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memcpy(sections, kernel + section_hdr_info.section_offset, section_hdr_info.section_entry_size * section_hdr_info.num);
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int bits = elf_bits(kernel);
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for (size_t i = 0; i < section_hdr_info.num; i++) {
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if (bits == 64) {
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struct elf64_shdr *shdr = (void *)sections + i * section_hdr_info.section_entry_size;
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if (shdr->sh_addr != 0 || shdr->sh_size == 0) {
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continue;
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}
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uint64_t section = (uint64_t)-1; /* no target preference, use top */
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if (!elsewhere_append(true /* flexible target */,
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ranges, &ranges_count,
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kernel + shdr->sh_offset, §ion, shdr->sh_size)) {
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panic(true, "multiboot1: Cannot allocate elf sections");
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}
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shdr->sh_addr = section;
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} else {
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struct elf32_shdr *shdr = (void *)sections + i * section_hdr_info.section_entry_size;
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if (shdr->sh_addr != 0 || shdr->sh_size == 0) {
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continue;
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}
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uint64_t section = (uint64_t)-1; /* no target preference, use top */
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if (!elsewhere_append(true /* flexible target */,
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ranges, &ranges_count,
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kernel + shdr->sh_offset, §ion, shdr->sh_size)) {
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panic(true, "multiboot1: Cannot allocate elf sections");
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}
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shdr->sh_addr = section;
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}
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}
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multiboot1_info->flags |= (1 << 5);
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}
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if (n_modules) {
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struct multiboot1_module *mods =
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mb1_info_alloc(&mb1_info_raw, sizeof(struct multiboot1_module) * n_modules);
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multiboot1_info->mods_count = n_modules;
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multiboot1_info->mods_addr = (size_t)mods - mb1_info_slide;
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for (size_t i = 0; i < n_modules; i++) {
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struct multiboot1_module *m = mods + i;
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struct conf_tuple conf_tuple = config_get_tuple(config, i, "MODULE_PATH", "MODULE_STRING");
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char *module_path = conf_tuple.value1;
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if (module_path == NULL)
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panic(true, "multiboot1: Module disappeared unexpectedly");
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print("multiboot1: Loading module `%#`...\n", module_path);
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struct file_handle *f;
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if ((f = uri_open(module_path)) == NULL)
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panic(true, "multiboot1: Failed to open module with path `%#`. Is the path correct?", module_path);
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char *module_cmdline = conf_tuple.value2;
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if (module_cmdline == NULL) {
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module_cmdline = "";
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}
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char *lowmem_modstr = mb1_info_alloc(&mb1_info_raw, strlen(module_cmdline) + 1);
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strcpy(lowmem_modstr, module_cmdline);
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void *module_addr = freadall(f, MEMMAP_BOOTLOADER_RECLAIMABLE);
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uint64_t module_target = (uint64_t)-1; /* no target preference, use top */
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if (!elsewhere_append(true /* flexible target */,
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ranges, &ranges_count,
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module_addr, &module_target, f->size)) {
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panic(true, "multiboot1: Cannot allocate module");
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}
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m->begin = module_target;
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m->end = m->begin + f->size;
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m->cmdline = (uint32_t)(size_t)lowmem_modstr - mb1_info_slide;
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m->pad = 0;
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fclose(f);
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if (verbose) {
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print("multiboot1: Requested module %u:\n", i);
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print(" Path: %s\n", module_path);
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print(" String: \"%s\"\n", module_cmdline ?: "");
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print(" Begin: %x\n", m->begin);
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print(" End: %x\n", m->end);
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}
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}
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multiboot1_info->flags |= (1 << 3);
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}
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char *lowmem_cmdline = mb1_info_alloc(&mb1_info_raw, strlen(cmdline) + 1);
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strcpy(lowmem_cmdline, cmdline);
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multiboot1_info->cmdline = (uint32_t)(size_t)lowmem_cmdline - mb1_info_slide;
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if (cmdline)
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multiboot1_info->flags |= (1 << 2);
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char *bootload_name = LIMINE_BRAND;
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char *lowmem_bootname = mb1_info_alloc(&mb1_info_raw, strlen(bootload_name) + 1);
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strcpy(lowmem_bootname, bootload_name);
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multiboot1_info->bootloader_name = (uint32_t)(size_t)lowmem_bootname - mb1_info_slide;
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multiboot1_info->flags |= (1 << 9);
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term_notready();
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size_t req_width = 0;
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size_t req_height = 0;
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size_t req_bpp = 0;
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#if defined (BIOS)
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{
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char *textmode_str = config_get_value(config, 0, "TEXTMODE");
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bool textmode = textmode_str != NULL && strcmp(textmode_str, "yes") == 0;
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if (textmode) {
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goto textmode;
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}
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}
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#endif
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if (header.flags & (1 << 2)) {
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req_width = header.fb_width;
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req_height = header.fb_height;
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req_bpp = header.fb_bpp;
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if (header.fb_mode == 0) {
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#if defined (UEFI)
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modeset:;
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#endif
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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(&req_width, &req_height, &req_bpp, resolution);
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struct fb_info *fbs;
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size_t fbs_count;
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fb_init(&fbs, &fbs_count, req_width, req_height, req_bpp);
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if (fbs_count == 0) {
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#if defined (UEFI)
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goto skip_modeset;
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#elif defined (BIOS)
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textmode:
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vga_textmode_init(false);
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multiboot1_info->fb_addr = 0xb8000;
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multiboot1_info->fb_width = 80;
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multiboot1_info->fb_height = 25;
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multiboot1_info->fb_bpp = 16;
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multiboot1_info->fb_pitch = 2 * 80;
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multiboot1_info->fb_type = 2;
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#endif
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} else {
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multiboot1_info->fb_addr = (uint64_t)fbs[0].framebuffer_addr;
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multiboot1_info->fb_width = fbs[0].framebuffer_width;
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multiboot1_info->fb_height = fbs[0].framebuffer_height;
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multiboot1_info->fb_bpp = fbs[0].framebuffer_bpp;
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multiboot1_info->fb_pitch = fbs[0].framebuffer_pitch;
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multiboot1_info->fb_type = 1;
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multiboot1_info->fb_red_mask_size = fbs[0].red_mask_size;
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multiboot1_info->fb_red_mask_shift = fbs[0].red_mask_shift;
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multiboot1_info->fb_green_mask_size = fbs[0].green_mask_size;
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multiboot1_info->fb_green_mask_shift = fbs[0].green_mask_shift;
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multiboot1_info->fb_blue_mask_size = fbs[0].blue_mask_size;
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multiboot1_info->fb_blue_mask_shift = fbs[0].blue_mask_shift;
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}
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} else {
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#if defined (UEFI)
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print("multiboot1: Warning: Cannot use text mode with UEFI\n");
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goto modeset;
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#elif defined (BIOS)
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goto textmode;
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#endif
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}
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multiboot1_info->flags |= (1 << 12);
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#if defined (UEFI)
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skip_modeset:;
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#endif
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} else {
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#if defined (UEFI)
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panic(true, "multiboot1: Cannot use text mode with UEFI.");
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#elif defined (BIOS)
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vga_textmode_init(false);
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#endif
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}
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// Load relocation stub where it won't get overwritten (hopefully)
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size_t reloc_stub_size = (size_t)multiboot_reloc_stub_end - (size_t)multiboot_reloc_stub;
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void *reloc_stub = ext_mem_alloc(reloc_stub_size);
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memcpy(reloc_stub, multiboot_reloc_stub, reloc_stub_size);
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#if defined (UEFI)
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efi_exit_boot_services();
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#endif
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size_t mb_mmap_count;
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struct memmap_entry *raw_memmap = get_raw_memmap(&mb_mmap_count);
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size_t mb_mmap_len = mb_mmap_count * sizeof(struct multiboot1_mmap_entry);
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struct multiboot1_mmap_entry *mmap = mb1_info_alloc(&mb1_info_raw, mb_mmap_len);
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// Multiboot is bad and passes raw memmap. We do the same to support it.
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for (size_t i = 0; i < mb_mmap_count; i++) {
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mmap[i].size = sizeof(struct multiboot1_mmap_entry) - 4;
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mmap[i].addr = raw_memmap[i].base;
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mmap[i].len = raw_memmap[i].length;
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mmap[i].type = raw_memmap[i].type;
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}
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struct meminfo memory_info = mmap_get_info(mb_mmap_count, raw_memmap);
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// Convert the uppermem and lowermem fields from bytes to
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// KiB.
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multiboot1_info->mem_lower = memory_info.lowermem / 1024;
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multiboot1_info->mem_upper = memory_info.uppermem / 1024;
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multiboot1_info->mmap_length = mb_mmap_len;
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multiboot1_info->mmap_addr = (uint32_t)(size_t)mmap - mb1_info_slide;
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multiboot1_info->flags |= (1 << 0) | (1 << 6);
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irq_flush_type = IRQ_PIC_ONLY_FLUSH;
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common_spinup(multiboot_spinup_32, 6,
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(uint32_t)(uintptr_t)reloc_stub, (uint32_t)0x2badb002,
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(uint32_t)mb1_info_final_loc, (uint32_t)entry_point,
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(uint32_t)(uintptr_t)ranges, (uint32_t)ranges_count);
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}
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#endif
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