protos: add initial multiboot1 implementation
This commit is contained in:
Kacper Słomiński
parent
60e1b43f66
commit
4fb782449f
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@ -15,6 +15,7 @@
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#include <protos/stivale2.h>
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#include <protos/linux.h>
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#include <protos/chainload.h>
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#include <protos/multiboot1.h>
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#include <menu.h>
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#include <pxe/pxe.h>
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#include <pxe/tftp.h>
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@ -122,6 +123,8 @@ void stage3_common(void) {
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linux_load(config, cmdline);
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} else if (!strcmp(proto, "chainload")) {
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chainload(config);
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} else if (!strcmp(proto, "multiboot1")) {
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multiboot1_load(config, cmdline);
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}
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panic("Invalid protocol specified");
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@ -0,0 +1,26 @@
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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 <mm/vmm.h>
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__attribute__((noreturn)) void multiboot1_spinup_32(
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uint32_t entry_point, uint32_t multiboot1_info) {
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asm volatile (
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"cli\n\t"
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"cld\n\t"
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"pushfl\n\t"
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"pushl $0x18\n\t"
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"pushl %%edi\n\t"
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"movl $0x2BADB002, %%eax\n\t"
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"iretl\n\t"
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:
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: "D" (entry_point),
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"b" (multiboot1_info)
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: "memory"
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);
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__builtin_unreachable();
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}
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@ -0,0 +1,222 @@
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#include <stdint.h>
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#include <stddef.h>
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#include <protos/multiboot1.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/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 <sys/pic.h>
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#include <sys/cpu.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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struct multiboot1_info multiboot1_info = {0};
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void multiboot1_load(char *config, char *cmdline) {
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struct file_handle *kernel_file = ext_mem_alloc(sizeof(*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("multiboot1: KERNEL_PATH not specified");
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print("multiboot1: Loading kernel `%s`...\n", kernel_path);
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if (!uri_open(kernel_file, kernel_path))
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panic("multiboot1: Could not open kernel resource");
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uint8_t *kernel = freadall(kernel_file, MEMMAP_USABLE);
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struct multiboot1_header header = {0};
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for (size_t i = 0; i < 8192; i += 4) {
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uint32_t v;
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memcpy(&v, kernel + i, 4);
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if (v == MULTIBOOT1_HEADER_MAGIC) {
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memcpy(&header, kernel + i, 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("multiboot1: Could not find header");
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if (header.magic + header.flags + header.checksum)
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panic("multiboot1: Header checksum is invalid");
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if (header.flags & (1 << 16))
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panic("multiboot1: Aout kludge not supported");
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if (elf_bits(kernel) != 32)
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panic("multiboot1: Kernel binary must be 32-bit");
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uint32_t entry_point = 0;
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if (elf32_load(kernel, (uint32_t *)&entry_point, MEMMAP_USABLE))
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panic("multiboot1: ELF32 load failure");
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uint32_t n_modules;
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for (n_modules = 0; ; n_modules++) {
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if (config_get_value(config, n_modules, "MODULE_PATH") == NULL)
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break;
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}
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if (n_modules) {
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struct multiboot1_module *mods = ext_mem_alloc(sizeof(*mods) * n_modules);
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multiboot1_info.mods_count = n_modules;
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multiboot1_info.mods_addr = (uint32_t)(size_t)mods;
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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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char *module_path = config_get_value(config, i, "MODULE_PATH");
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if (module_path == NULL)
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panic("multiboot1: Module disappeared unexpectedly");
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print("multiboot1: Loading module `%s`...\n", module_path);
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struct file_handle f;
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if (!uri_open(&f, module_path))
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panic("multiboot1: Requested module with path \"%s\" not found!", module_path);
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char *cmdline = config_get_value(config, i, "MODULE_STRING");
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m->begin = (uint32_t)(size_t)freadall(&f, MEMMAP_USABLE);
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m->end = m->begin + f.size;
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m->cmdline = (uint32_t)(size_t)cmdline;
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m->pad = 0;
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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", 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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multiboot1_info.cmdline = (uint32_t)(size_t)cmdline;
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if (cmdline)
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multiboot1_info.flags |= (1 << 2);
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multiboot1_info.bootloader_name = (uint32_t)(size_t)"Limine";
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multiboot1_info.flags |= (1 << 9);
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term_deinit();
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if (header.flags & (1 << 2)) {
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int req_width = header.fb_width;
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int req_height = header.fb_height;
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int req_bpp = header.fb_bpp;
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if (header.fb_mode == 0) {
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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 fbinfo;
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if (!fb_init(&fbinfo, req_width, req_height, req_bpp))
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panic("multiboot1: Unable to set video mode");
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multiboot1_info.fb_addr = (uint64_t)fbinfo.framebuffer_addr;
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multiboot1_info.fb_width = fbinfo.framebuffer_width;
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multiboot1_info.fb_height = fbinfo.framebuffer_height;
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multiboot1_info.fb_bpp = fbinfo.framebuffer_bpp;
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multiboot1_info.fb_pitch = fbinfo.framebuffer_pitch;
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multiboot1_info.fb_type = 1;
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multiboot1_info.fb_red_mask_size = fbinfo.red_mask_size;
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multiboot1_info.fb_red_mask_shift = fbinfo.red_mask_shift;
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multiboot1_info.fb_green_mask_size = fbinfo.green_mask_size;
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multiboot1_info.fb_green_mask_shift = fbinfo.green_mask_shift;
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multiboot1_info.fb_blue_mask_size = fbinfo.blue_mask_size;
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multiboot1_info.fb_blue_mask_shift = fbinfo.blue_mask_shift;
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} else if (header.fb_mode == 1) {
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#if defined (uefi)
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panic("multiboot1: Cannot use text mode with UEFI.");
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#elif defined (bios)
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int rows, cols;
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init_vga_textmode(&rows, &cols, false);
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multiboot1_info.fb_addr = 0xB8000;
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multiboot1_info.fb_width = cols;
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multiboot1_info.fb_height = rows;
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multiboot1_info.fb_bpp = 16;
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multiboot1_info.fb_pitch = 2 * cols;
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multiboot1_info.fb_type = 2;
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#endif
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} else {
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panic("multiboot1: Illegal framebuffer type requested");
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}
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multiboot1_info.flags |= (1 << 12);
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}
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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 memmap_entries;
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struct e820_entry_t *memmap = get_memmap(&memmap_entries);
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// The layouts of the e820_entry_t and multiboot1_mmap_entry structs match almost perfectly
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// apart from the padding/size being in the wrong place (at the end and beginning respectively).
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// To be able to use the memmap directly, we offset it back by 4 so the fields align properly.
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// Since we're about to exit we don't really care about what we've clobbered by doing this.
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struct multiboot1_mmap_entry *mmap = (void *)((size_t)memmap - 4);
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size_t memory_lower = 0, memory_upper = 0;
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for (size_t i = 0; i < memmap_entries; i++ ){
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mmap[i].size = sizeof(*mmap) - 4;
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if (memmap[i].type == MEMMAP_BOOTLOADER_RECLAIMABLE)
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memmap[i].type = MEMMAP_USABLE;
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if (memmap[i].type == MEMMAP_USABLE) {
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if (memmap[i].base < 0x100000)
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memory_lower += memmap[i].length;
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else
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memory_upper += memmap[i].length;
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}
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}
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multiboot1_info.mem_lower = memory_lower / 1024;
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multiboot1_info.mem_upper = memory_upper / 1024;
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multiboot1_info.mmap_length = sizeof(*mmap) * memmap_entries;
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multiboot1_info.mmap_addr = ((uint32_t)(size_t)mmap);
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multiboot1_info.flags |= (1 << 0) | (1 << 6);
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multiboot1_spinup(entry_point, (uint32_t)(uintptr_t)&multiboot1_info);
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}
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__attribute__((noreturn)) void multiboot1_spinup_32(
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uint32_t entry_point,
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uint32_t multiboot1_info);
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__attribute__((noreturn)) void multiboot1_spinup(
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uint32_t entry_point, uint32_t multiboot1_info) {
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pic_mask_all();
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pic_flush();
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#if defined (uefi)
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do_32(multiboot1_spinup_32, 2, entry_point, multiboot1_info);
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#endif
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#if defined (bios)
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multiboot1_spinup_32(entry_point, multiboot1_info);
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#endif
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__builtin_unreachable();
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}
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@ -0,0 +1,101 @@
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#ifndef __PROTOS__MULTIBOOT1_H__
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#define __PROTOS__MULTIBOOT1_H__
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#include <stdint.h>
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#include <stddef.h>
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#define MULTIBOOT1_HEADER_MAGIC 0x1BADB002
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struct multiboot1_header {
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uint32_t magic;
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uint32_t flags;
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uint32_t checksum;
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uint32_t header_addr;
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uint32_t load_addr;
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uint32_t load_end_addr;
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uint32_t bss_end_addr;
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uint32_t entry_addr;
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uint32_t fb_mode;
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uint32_t fb_width;
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uint32_t fb_height;
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uint32_t fb_bpp;
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};
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struct multiboot1_elf_sections {
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uint32_t num;
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uint32_t size;
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uint32_t addr;
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uint32_t shndx;
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};
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struct multiboot1_info {
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uint32_t flags;
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uint32_t mem_lower;
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uint32_t mem_upper;
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uint32_t boot_device;
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uint32_t cmdline;
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uint32_t mods_count;
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uint32_t mods_addr;
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struct multiboot1_elf_sections elf_sect;
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uint32_t mmap_length;
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uint32_t mmap_addr;
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uint32_t drives_length;
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uint32_t drivers_addr;
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uint32_t rom_config_table;
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uint32_t bootloader_name;
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uint32_t apm_table;
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uint32_t vbe_control_info;
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uint32_t vbe_mode_info;
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uint16_t vbe_mode;
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uint16_t vbe_interface_seg;
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uint16_t vbe_interface_off;
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uint16_t vbe_interface_len;
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uint64_t fb_addr;
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uint32_t fb_pitch;
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uint32_t fb_width;
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uint32_t fb_height;
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uint8_t fb_bpp;
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uint8_t fb_type;
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uint8_t fb_red_mask_shift;
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uint8_t fb_red_mask_size;
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uint8_t fb_green_mask_shift;
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uint8_t fb_green_mask_size;
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uint8_t fb_blue_mask_shift;
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uint8_t fb_blue_mask_size;
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};
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struct multiboot1_module {
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uint32_t begin;
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uint32_t end;
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uint32_t cmdline;
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uint32_t pad;
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};
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struct multiboot1_mmap_entry {
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uint32_t size;
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uint64_t addr;
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uint64_t len;
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uint32_t type;
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} __attribute__((packed));
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void multiboot1_load(char *config, char *cmdline);
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__attribute__((noreturn)) void multiboot1_spinup(
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uint32_t entry_point, uint32_t multiboot1_info);
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#endif
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