limine: Introduce basic Limine protocol concept
This commit is contained in:
mintsuki
parent
c2b1be81dc
commit
b2e614e7c2
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@ -0,0 +1,65 @@
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#ifndef _LIMINE_H
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#define _LIMINE_H 1
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#include <stdint.h>
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#ifdef LIMINE_NO_POINTERS
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# define LIMINE_CHARPTR uint64_t
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# define LIMINE_VOIDPTR uint64_t
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# define LIMINE_VOIDPTRPTR uint64_t
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#else
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# define LIMINE_CHARPTR char *
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# define LIMINE_VOIDPTR void *
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# define LIMINE_VOIDPTRPTR void **
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#endif
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#define LIMINE_MAGIC { 0xc7b1dd30df4c8b88, 0x0a82e883a194f07b }
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struct limine_header {
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uint64_t magic[2];
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LIMINE_VOIDPTR entry;
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uint64_t features_count;
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LIMINE_VOIDPTRPTR features;
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};
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// Boot info
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#define LIMINE_BOOT_INFO_REQUEST ((LIMINE_VOIDPTR) 1 )
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struct limine_boot_info_response {
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uint64_t flags;
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LIMINE_CHARPTR loader;
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};
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// Framebuffer
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#define LIMINE_FRAMEBUFFER_REQUEST ((LIMINE_VOIDPTR) 2 )
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struct limine_framebuffer_request {
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LIMINE_VOIDPTR id;
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#define LIMINE_FRAMEBUFFER_PREFER_LFB 0
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#define LIMINE_FRAMEBUFFER_PREFER_TEXT 1
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#define LIMINE_FRAMEBUFFER_ENFORCE_PREFER (1 << 8)
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uint64_t flags;
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uint16_t width;
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uint16_t height;
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uint16_t bpp;
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uint16_t unused;
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};
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// 5-level paging
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#define LIMINE_5_LEVEL_PAGING_REQUEST ((LIMINE_VOIDPTR) 3 )
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struct limine_5_level_paging_response {
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uint64_t flags;
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};
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// PMRs
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#define LIMINE_PMR_REQUEST ((LIMINE_VOIDPTR) 4 )
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#endif
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@ -21,6 +21,7 @@
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#include <protos/chainload.h>
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#include <protos/multiboot1.h>
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#include <protos/multiboot2.h>
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#include <protos/limine.h>
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static char *menu_branding = NULL;
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static char *menu_branding_colour = NULL;
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@ -948,6 +949,8 @@ autodetect:
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ret = stivale_load(config, cmdline);
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} else if (!strcmp(proto, "stivale2")) {
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ret = stivale2_load(config, cmdline);
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} else if (!strcmp(proto, "limine")) {
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ret = limine_load(config, cmdline);
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} else if (!strcmp(proto, "linux")) {
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ret = linux_load(config, cmdline);
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} else if (!strcmp(proto, "multiboot1") || !strcmp(proto, "multiboot")) {
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@ -0,0 +1,251 @@
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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 <config.h>
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#include <protos/stivale.h>
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#include <protos/stivale2.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/libc.h>
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#include <lib/gterm.h>
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#include <lib/uri.h>
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#include <sys/smp.h>
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#include <sys/cpu.h>
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#include <sys/gdt.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/lapic.h>
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#include <fs/file.h>
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#include <mm/pmm.h>
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#include <stivale2.h>
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#include <pxe/tftp.h>
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#include <drivers/edid.h>
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#include <drivers/vga_textmode.h>
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#include <lib/rand.h>
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#define LIMINE_NO_POINTERS
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#include <protos/limine.h>
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#include <limine.h>
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static uint64_t features_count, physical_base, virtual_base, slide, direct_map_offset;
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static uint64_t *features, *features_orig;
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static uint64_t reported_addr(void *addr) {
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return (uint64_t)(uintptr_t)addr + direct_map_offset;
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}
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static uintptr_t get_phys_addr(uint64_t addr) {
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return physical_base + (addr - virtual_base);
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}
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struct feature {
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bool found;
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size_t index;
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void *request;
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};
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static struct feature get_feature(uint64_t id) {
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for (size_t i = 0; i < features_count; i++) {
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if (features[i] < 0xffffffff80000000 && features[i] == id) {
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return (struct feature){
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.found = true,
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.index = i,
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.request = NULL
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};
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} else {
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uint64_t *id_ptr = (void *)get_phys_addr(features[i] + slide);
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if (*id_ptr == id) {
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return (struct feature){
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.found = true,
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.index = i,
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.request = (void *)id_ptr
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};
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}
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}
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}
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return (struct feature){
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.found = false,
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.index = 0,
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.request = NULL
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};
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}
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#define FEAT_START do {
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#define FEAT_END } while (0);
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bool limine_load(char *config, char *cmdline) {
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(void)cmdline;
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uint32_t eax, ebx, ecx, edx;
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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, "limine: KERNEL_PATH not specified");
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print("limine: 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(true, "limine: Failed to open kernel with path `%s`. Is the path correct?", kernel_path);
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uint8_t *kernel = freadall(kernel_file, MEMMAP_BOOTLOADER_RECLAIMABLE);
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size_t kernel_file_size = kernel_file->size;
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//struct volume *kernel_volume = kernel_file->vol;
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fclose(kernel_file);
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// Search for header
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struct limine_header *limine_header = NULL;
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uint64_t limine_magic[2] = LIMINE_MAGIC;
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for (size_t i = 0; i < kernel_file_size; i += 16) {
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if (memcmp(kernel + i, limine_magic, 16) == 0) {
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limine_header = (void *)(kernel + i);
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}
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}
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if (limine_header == NULL) {
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panic(true, "limine: Magic number not found");
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}
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printv("limine: Header found at %p\n", (size_t)limine_header - (size_t)kernel);
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// Check if 64 bit CPU
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if (!cpuid(0x80000001, 0, &eax, &ebx, &ecx, &edx) || !(edx & (1 << 29))) {
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panic(true, "limine: This CPU does not support 64-bit mode.");
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}
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char *kaslr_s = config_get_value(config, 0, "KASLR");
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bool kaslr = true;
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if (kaslr_s != NULL && strcmp(kaslr_s, "no") == 0)
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kaslr = false;
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int bits = elf_bits(kernel);
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if (bits == -1 || bits == 32) {
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panic(true, "limine: Kernel in unrecognised format");
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}
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uint64_t entry_point = 0;
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struct elf_range *ranges;
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uint64_t ranges_count;
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if (elf64_load(kernel, &entry_point, NULL, &slide,
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MEMMAP_KERNEL_AND_MODULES, kaslr, false,
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&ranges, &ranges_count,
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true, &physical_base, &virtual_base)) {
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panic(true, "limine: ELF64 load failure");
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}
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if (limine_header->entry != 0) {
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entry_point = limine_header->entry + slide;
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}
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printv("limine: Physical base: %X\n", physical_base);
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printv("limine: Virtual base: %X\n", virtual_base);
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printv("limine: Slide: %X\n", slide);
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printv("limine: Entry point: %X\n", entry_point);
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// Prepare features
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features_count = limine_header->features_count;
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features_orig = (void *)get_phys_addr(limine_header->features + slide);
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features = ext_mem_alloc(features_count * sizeof(uint64_t));
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memcpy(features, features_orig, features_count * sizeof(uint64_t));
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for (size_t i = 0; i < features_count; i++) {
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features_orig[i] = 0;
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}
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printv("limine: Features count: %U\n", features_count);
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printv("limine: Features list at %X (%p)\n", limine_header->features, features_orig);
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// 5 level paging feature & HHDM slide
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bool want_5lv;
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FEAT_START
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// Check if 5-level paging is available
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bool level5pg = false;
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if (cpuid(0x00000007, 0, &eax, &ebx, &ecx, &edx) && (ecx & (1 << 16))) {
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printv("limine: CPU has 5-level paging support\n");
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level5pg = true;
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}
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struct feature lv5pg_feat = get_feature(LIMINE_5_LEVEL_PAGING_REQUEST);
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want_5lv = lv5pg_feat.found && level5pg;
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direct_map_offset = want_5lv ? 0xff00000000000000 : 0xffff800000000000;
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if (kaslr) {
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direct_map_offset += (rand64() & ~((uint64_t)0x40000000 - 1)) & 0xfffffffffff;
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}
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if (want_5lv) {
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void *lv5pg_response = ext_mem_alloc(sizeof(struct limine_5_level_paging_response));
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features_orig[lv5pg_feat.index] = reported_addr(lv5pg_response);
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}
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FEAT_END
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// Boot info feature
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FEAT_START
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struct feature boot_info_feat = get_feature(LIMINE_BOOT_INFO_REQUEST);
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if (boot_info_feat.found == false) {
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break; // next feature
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}
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struct limine_boot_info_response *boot_info_response =
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ext_mem_alloc(sizeof(struct limine_boot_info_response));
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boot_info_response->loader = reported_addr("Limine " LIMINE_VERSION);
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features_orig[boot_info_feat.index] = reported_addr(boot_info_response);
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FEAT_END
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// Framebuffer feature
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FEAT_START
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term_deinit();
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struct fb_info *fb = NULL;
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fb_init(fb, 0, 0, 0);
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FEAT_END
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// Wrap-up stuff before memmap close
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struct gdtr *local_gdt = ext_mem_alloc(sizeof(struct gdtr));
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local_gdt->limit = gdt.limit;
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uint64_t local_gdt_base = (uint64_t)gdt.ptr;
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local_gdt_base += direct_map_offset;
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local_gdt->ptr = local_gdt_base;
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#if defined (__i386__)
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local_gdt->ptr_hi = local_gdt_base >> 32;
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#endif
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void *stack = ext_mem_alloc(8192) + 8192;
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pagemap_t pagemap = {0};
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pagemap = stivale_build_pagemap(want_5lv, true, ranges, ranges_count, true,
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physical_base, virtual_base, direct_map_offset);
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// Memmap
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FEAT_START
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size_t mmap_entries;
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struct e820_entry_t *mmap = get_memmap(&mmap_entries);
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(void)mmap;
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FEAT_END
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// Final wrap-up
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#if uefi == 1
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efi_exit_boot_services();
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#endif
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stivale_spinup(64, want_5lv, &pagemap, entry_point, 0,
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reported_addr(stack), true, (uintptr_t)local_gdt);
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__builtin_unreachable();
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}
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@ -0,0 +1,8 @@
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#ifndef __PROTOS__LIMINE_H__
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#define __PROTOS__LIMINE_H__
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#include <stdbool.h>
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bool limine_load(char *config, char *cmdline);
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#endif
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@ -31,6 +31,7 @@ INTERNAL_LD_FLAGS_MULTIBOOT1 := \
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INTERNALCFLAGS := \
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-I../stivale \
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-I. \
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-I../common \
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-std=gnu11 \
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-ffreestanding \
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-fno-stack-protector \
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@ -45,7 +46,7 @@ INTERNALCFLAGS := \
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all: test.elf multiboot2.elf multiboot.elf
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test.elf: stivale.o stivale2.o e9print.o memory.o
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test.elf: stivale.o stivale2.o limine.o e9print.o memory.o
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$(LD) $^ $(LDFLAGS) $(INTERNALLDFLAGS) -o $@
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multiboot2.elf: multiboot2_trampoline.o
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@ -0,0 +1,48 @@
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#include <stdint.h>
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#include <stddef.h>
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#include <limine.h>
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#include <e9print.h>
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static struct limine_framebuffer_request framebuffer_request = {
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.id = LIMINE_FRAMEBUFFER_REQUEST,
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.flags = LIMINE_FRAMEBUFFER_PREFER_LFB | LIMINE_FRAMEBUFFER_ENFORCE_PREFER,
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.height = 0, .width = 0, .bpp = 0
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};
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static void *features_array[] = {
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LIMINE_BOOT_INFO_REQUEST,
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&framebuffer_request,
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LIMINE_5_LEVEL_PAGING_REQUEST,
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LIMINE_PMR_REQUEST
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};
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static void limine_main(void);
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__attribute__((used, aligned(16)))
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static struct limine_header limine_header = {
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.magic = LIMINE_MAGIC,
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.entry = limine_main,
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.features_count = sizeof(features_array) / sizeof(void *),
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.features = features_array
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};
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#define FEAT_START do {
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#define FEAT_END } while (0);
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static void limine_main(void) {
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e9_printf("We're alive");
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FEAT_START
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if (features_array[0] == NULL) {
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break;
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}
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struct limine_boot_info_response *boot_info_response = features_array[0];
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e9_printf("Boot info response:");
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e9_printf("Bootloader name: %s", boot_info_response->loader);
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FEAT_END
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for (;;);
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}
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@ -11,13 +11,11 @@ BACKGROUND_PATH=${BACKGROUND_PATH}
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BACKGROUND_STYLE=stretched
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BACKDROP_COLOUR=008080
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:Stivale2 Test
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:Limine Test
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COMMENT=Test of the stivale2 boot protocol.
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COMMENT=Test of the Limine boot protocol.
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# Let's use autodetection
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#PROTOCOL=stivale2
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RESOLUTION=800x600
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PROTOCOL=limine
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KERNEL_PATH=${STIVALE_KERNEL}
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KERNEL_CMDLINE=Woah! Another example!
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