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stivale2: Implement kernel loading by anchor for non-ELF kernels

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This commit is contained in:
mintsuki 2021-07-05 10:20:35 +02:00
parent d62c4f67d5
commit 84e540ee48
1 changed files with 37 additions and 18 deletions
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55
stage23/protos/stivale2.c
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@ -70,24 +70,36 @@ void stivale2_load(char *config, char *cmdline, bool pxe, void *efi_system_table
if (!uri_open(kernel_file, kernel_path))
panic("stivale2: Failed to open kernel with path `%s`. Is the path correct?", kernel_path);
struct stivale2_header stivale2_hdr;
uint8_t *kernel = freadall(kernel_file, STIVALE2_MMAP_BOOTLOADER_RECLAIMABLE);
int bits = elf_bits(kernel);
int ret;
bool level5pg = false;
char *kaslr_s = config_get_value(config, 0, "KASLR");
bool kaslr = true;
if (kaslr_s != NULL && strcmp(kaslr_s, "no") == 0)
kaslr = false;
struct stivale2_header stivale2_hdr;
bool level5pg = false;
uint64_t slide = 0;
uint64_t entry_point = 0;
uint8_t *kernel = freadall(kernel_file, STIVALE2_MMAP_BOOTLOADER_RECLAIMABLE);
int bits = elf_bits(kernel);
bool loaded_by_anchor = false;
if (bits == -1) {
struct stivale_anchor *anchor;
if (!stivale_load_by_anchor(&anchor, "STIVALE2 ANCHOR", kernel, kernel_file->size)) {
panic("stivale2: Not a valid ELF or anchored file.");
}
bits = anchor->bits;
memcpy(&stivale2_hdr, (void *)(uintptr_t)anchor->phys_stivalehdr,
sizeof(struct stivale2_header));
loaded_by_anchor = true;
}
int ret = 0;
switch (bits) {
case 64: {
// Check if 64 bit CPU
@ -101,26 +113,33 @@ void stivale2_load(char *config, char *cmdline, bool pxe, void *efi_system_table
level5pg = true;
}
if (elf64_load(kernel, &entry_point, NULL, &slide, STIVALE2_MMAP_KERNEL_AND_MODULES, kaslr, false))
panic("stivale2: ELF64 load failure");
if (!loaded_by_anchor) {
if (elf64_load(kernel, &entry_point, NULL, &slide,
STIVALE2_MMAP_KERNEL_AND_MODULES, kaslr, false))
panic("stivale2: ELF64 load failure");
ret = elf64_load_section(kernel, &stivale2_hdr, ".stivale2hdr", sizeof(struct stivale2_header), slide);
ret = elf64_load_section(kernel, &stivale2_hdr, ".stivale2hdr",
sizeof(struct stivale2_header), slide);
}
break;
}
case 32: {
if (elf32_load(kernel, (uint32_t *)&entry_point, NULL, 10))
panic("stivale2: ELF32 load failure");
if (!loaded_by_anchor) {
if (elf32_load(kernel, (uint32_t *)&entry_point, NULL, 10))
panic("stivale2: ELF32 load failure");
ret = elf32_load_section(kernel, &stivale2_hdr, ".stivale2hdr", sizeof(struct stivale2_header));
ret = elf32_load_section(kernel, &stivale2_hdr, ".stivale2hdr",
sizeof(struct stivale2_header));
}
break;
}
default:
panic("stivale2: Not 32 nor 64 bit x86 ELF file.");
panic("stivale2: Not 32 nor 64-bit kernel. What is this?");
}
printv("stivale2: %u-bit ELF file detected\n", bits);
printv("stivale2: %u-bit kernel detected\n", bits);
switch (ret) {
case 1: