limine/common/protos/chainload.c

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#include <stddef.h>
#include <stdint.h>
#include <stdnoreturn.h>
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#include <protos/chainload.h>
#include <lib/part.h>
#include <lib/config.h>
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#include <lib/misc.h>
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#include <drivers/disk.h>
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#include <lib/term.h>
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#include <lib/fb.h>
#include <lib/uri.h>
#include <lib/print.h>
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#include <lib/libc.h>
#include <sys/idt.h>
#include <drivers/vga_textmode.h>
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#include <mm/pmm.h>
#if defined (UEFI)
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# include <efi.h>
#endif
#if defined (BIOS)
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__attribute__((noinline, section(".realmode")))
noreturn static void spinup(uint8_t drive, void *buf) {
struct idtr real_mode_idt;
real_mode_idt.limit = 0x3ff;
real_mode_idt.ptr = 0;
asm volatile (
"cli\n\t"
"cld\n\t"
// Safe stack location
"mov $0x7c00, %%esp\n\t"
// move buffer to final location
"mov $0x7c00, %%edi\n\t"
"mov $512, %%ecx\n\t"
"rep movsb\n\t"
"lidt (%%eax)\n\t"
"pushl $0x08\n\t"
"pushl $1f\n\t"
"lret\n\t"
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"1: .code16\n\t"
"movw $0x10, %%ax\n\t"
"movw %%ax, %%ds\n\t"
"movw %%ax, %%es\n\t"
"movw %%ax, %%fs\n\t"
"movw %%ax, %%gs\n\t"
"movw %%ax, %%ss\n\t"
"movl %%cr0, %%eax\n\t"
"andb $0xfe, %%al\n\t"
"movl %%eax, %%cr0\n\t"
"movl $1f, %%eax\n\t"
"pushw $0\n\t"
"pushw %%ax\n\t"
"lret\n\t"
"1:\n\t"
"xorw %%ax, %%ax\n\t"
"movw %%ax, %%ds\n\t"
"movw %%ax, %%es\n\t"
"movw %%ax, %%fs\n\t"
"movw %%ax, %%gs\n\t"
"movw %%ax, %%ss\n\t"
"sti\n\t"
"pushw $0\n\t"
"pushw $0x7c00\n\t"
"lret\n\t"
".code32\n\t"
:
: "a" (&real_mode_idt), "d" (drive), "S"(buf)
: "memory"
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);
__builtin_unreachable();
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}
noreturn void chainload(char *config, char *cmdline) {
(void)cmdline;
uint64_t val;
int part; {
char *part_config = config_get_value(config, 0, "PARTITION");
if (part_config == NULL) {
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part = 0;
} else {
val = strtoui(part_config, NULL, 10);
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if (val > 256) {
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panic(true, "chainload: BIOS partition number outside range 0-256");
}
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part = val;
}
}
int drive; {
char *drive_config = config_get_value(config, 0, "DRIVE");
if (drive_config == NULL) {
drive = boot_volume->index;
} else {
val = strtoui(drive_config, NULL, 10);
if (val < 1 || val > 256) {
panic(true, "chainload: BIOS drive number outside range 1-256");
}
drive = val;
}
}
struct volume *p = volume_get_by_coord(false, drive, part);
char *gpt_guid_s = config_get_value(config, 0, "GPT_GUID");
if (gpt_guid_s == NULL) {
gpt_guid_s = config_get_value(config, 0, "GPT_UUID");
}
if (gpt_guid_s != NULL) {
struct guid guid;
if (!string_to_guid_be(&guid, gpt_guid_s)) {
panic(true, "chainload: Malformed GUID");
}
p = volume_get_by_guid(&guid);
if (p == NULL) {
if (!string_to_guid_mixed(&guid, gpt_guid_s)) {
panic(true, "chainload: Malformed GUID");
}
p = volume_get_by_guid(&guid);
}
if (p == NULL) {
panic(true, "chainload: No matching GPT drive for GPT_GUID found");
}
if (p->partition != 0) {
panic(true, "chainload: GPT_GUID is that of a partition, not a drive");
}
p = volume_get_by_coord(false, p->index, part);
if (p == NULL) {
panic(true, "chainload: Partition specified is not valid");
}
goto load;
}
char *mbr_id_s = config_get_value(config, 0, "MBR_ID");
if (mbr_id_s != NULL) {
uint32_t mbr_id = strtoui(mbr_id_s, NULL, 16);
for (size_t i = 0; i < volume_index_i; i++) {
p = volume_index[i];
if (!is_valid_mbr(p)) {
continue;
}
uint32_t mbr_id_1;
volume_read(p, &mbr_id_1, 0x1b8, sizeof(uint32_t));
if (mbr_id_1 == mbr_id) {
p = volume_get_by_coord(false, p->index, part);
if (p == NULL) {
panic(true, "chainload: Partition specified is not valid");
}
goto load;
}
}
panic(true, "chainload: No matching MBR ID found");
}
load:
bios_chainload_volume(p);
panic(true, "chainload: Volume is not bootable");
}
void bios_chainload_volume(struct volume *p) {
vga_textmode_init(false);
void *buf = ext_mem_alloc(512);
volume_read(p, buf, 0, 512);
uint16_t *boot_sig = (uint16_t *)(buf + 0x1fe);
if (*boot_sig != 0xaa55) {
return;
}
spinup(p->drive, buf);
}
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#elif defined (UEFI)
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noreturn void chainload(char *config, char *cmdline) {
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char *image_path = config_get_value(config, 0, "IMAGE_PATH");
if (image_path == NULL)
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panic(true, "chainload: IMAGE_PATH not specified");
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struct file_handle *image;
if ((image = uri_open(image_path)) == NULL)
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panic(true, "chainload: Failed to open image with path `%s`. Is the path correct?", image_path);
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efi_chainload_file(config, cmdline, image);
}
noreturn void efi_chainload_file(char *config, char *cmdline, struct file_handle *image) {
EFI_STATUS status;
EFI_HANDLE efi_part_handle = image->efi_part_handle;
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void *_ptr = freadall(image, MEMMAP_RESERVED);
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size_t image_size = image->size;
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void *ptr;
status = gBS->AllocatePool(EfiLoaderData, image_size, &ptr);
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if (status)
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panic(true, "chainload: Allocation failure");
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memcpy(ptr, _ptr, image_size);
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pmm_free(_ptr, image->size);
fclose(image);
term_notready();
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size_t req_width = 0, req_height = 0, req_bpp = 0;
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char *resolution = config_get_value(config, 0, "RESOLUTION");
if (resolution != NULL)
parse_resolution(&req_width, &req_height, &req_bpp, resolution);
struct fb_info *fbinfo;
size_t fb_count;
fb_init(&fbinfo, &fb_count, req_width, req_height, req_bpp);
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size_t cmdline_len = strlen(cmdline);
CHAR16 *new_cmdline;
status = gBS->AllocatePool(EfiLoaderData, cmdline_len * sizeof(CHAR16), (void **)&new_cmdline);
if (status) {
panic(true, "chainload: Allocation failure");
}
for (size_t i = 0; i < cmdline_len + 1; i++) {
new_cmdline[i] = cmdline[i];
}
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pmm_release_uefi_mem();
MEMMAP_DEVICE_PATH memdev_path[2];
memdev_path[0].Header.Type = HARDWARE_DEVICE_PATH;
memdev_path[0].Header.SubType = HW_MEMMAP_DP;
memdev_path[0].Header.Length[0] = sizeof(MEMMAP_DEVICE_PATH);
memdev_path[0].Header.Length[1] = sizeof(MEMMAP_DEVICE_PATH) >> 8;
memdev_path[0].MemoryType = EfiLoaderData;
memdev_path[0].StartingAddress = (uintptr_t)ptr;
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memdev_path[0].EndingAddress = (uintptr_t)ptr + image_size;
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memdev_path[1].Header.Type = END_DEVICE_PATH_TYPE;
memdev_path[1].Header.SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;
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memdev_path[1].Header.Length[0] = sizeof(EFI_DEVICE_PATH);
memdev_path[1].Header.Length[1] = sizeof(EFI_DEVICE_PATH) >> 8;
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EFI_HANDLE new_handle = 0;
status = gBS->LoadImage(0, efi_image_handle,
(EFI_DEVICE_PATH *)memdev_path,
ptr, image_size, &new_handle);
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if (status) {
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panic(false, "chainload: LoadImage failure (%x)", status);
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}
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// Apparently we need to make sure that the DeviceHandle field is the same
// as us (the loader) for some EFI images to properly work (Windows for instance)
EFI_GUID loaded_img_prot_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
EFI_LOADED_IMAGE_PROTOCOL *new_handle_loaded_image = NULL;
status = gBS->HandleProtocol(new_handle, &loaded_img_prot_guid,
(void **)&new_handle_loaded_image);
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if (status) {
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panic(false, "chainload: HandleProtocol failure (%x)", status);
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}
if (efi_part_handle != 0) {
new_handle_loaded_image->DeviceHandle = efi_part_handle;
}
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new_handle_loaded_image->LoadOptionsSize = cmdline_len * sizeof(CHAR16);
new_handle_loaded_image->LoadOptions = new_cmdline;
UINTN exit_data_size = 0;
CHAR16 *exit_data = NULL;
EFI_STATUS exit_status = gBS->StartImage(new_handle, &exit_data_size, &exit_data);
status = gBS->Exit(efi_image_handle, exit_status, exit_data_size, exit_data);
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if (status) {
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panic(false, "chainload: Exit failure (%x)", status);
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}
__builtin_unreachable();
}
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#endif