limine/stage23/entry.s3.c

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#include <lib/term.h>
#include <lib/real.h>
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#include <lib/blib.h>
#include <lib/libc.h>
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#include <lib/part.h>
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#include <lib/config.h>
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#include <lib/trace.h>
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#include <sys/e820.h>
#include <sys/a20.h>
#include <sys/idt.h>
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#include <lib/print.h>
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#include <fs/file.h>
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#include <lib/elf.h>
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#include <mm/pmm.h>
#include <protos/stivale.h>
#include <protos/stivale2.h>
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#include <protos/linux.h>
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#include <protos/chainload.h>
#include <protos/multiboot1.h>
#include <protos/multiboot2.h>
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#include <menu.h>
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#include <pxe/pxe.h>
#include <pxe/tftp.h>
#include <drivers/disk.h>
#include <sys/lapic.h>
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void stage3_common(void);
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#if uefi == 1
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__attribute__((naked))
EFI_STATUS efi_main(
__attribute__((unused)) EFI_HANDLE ImageHandle,
__attribute__((unused)) EFI_SYSTEM_TABLE *SystemTable) {
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// Invalid return address of 0 to end stacktraces here
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#if defined (__x86_64__)
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asm (
"xorl %eax, %eax\n\t"
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"movq %rax, (%rsp)\n\t"
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"jmp uefi_entry\n\t"
);
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#elif defined (__i386__)
asm (
"xorl %eax, %eax\n\t"
"movl %eax, (%esp)\n\t"
"jmp uefi_entry\n\t"
);
#endif
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}
__attribute__((noreturn))
void uefi_entry(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
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gST = SystemTable;
gBS = SystemTable->BootServices;
gRT = SystemTable->RuntimeServices;
efi_image_handle = ImageHandle;
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EFI_STATUS status;
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init_memmap();
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term_vbe(0, 0);
early_term = true;
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copyright_notice();
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disk_create_index();
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boot_volume = NULL;
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EFI_HANDLE current_handle = ImageHandle;
for (;;) {
if (current_handle == NULL) {
print("WARNING: Could not meaningfully match the boot device handle with a volume.\n");
print(" Using the first volume containing a Limine configuration!\n");
for (size_t i = 0; i < volume_index_i; i++) {
struct file_handle f;
if (fopen(&f, volume_index[i], "/limine.cfg")
&& fopen(&f, volume_index[i], "/boot/limine.cfg")
&& fopen(&f, volume_index[i], "/EFI/BOOT/limine.cfg")) {
continue;
}
if (volume_index[i]->backing_dev != NULL) {
boot_volume = volume_index[i]->backing_dev;
} else {
boot_volume = volume_index[i];
}
break;
}
if (boot_volume != NULL)
stage3_common();
panic("No volume contained a Limine configuration file");
}
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EFI_GUID loaded_img_prot_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
EFI_LOADED_IMAGE_PROTOCOL *loaded_image = NULL;
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status = gBS->HandleProtocol(current_handle, &loaded_img_prot_guid,
(void **)&loaded_image);
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if (status) {
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panic("HandleProtocol failure (%x)", status);
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}
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boot_volume = disk_volume_from_efi_handle(loaded_image->DeviceHandle);
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if (boot_volume != NULL)
stage3_common();
current_handle = loaded_image->ParentHandle;
}
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}
#endif
#if bios == 1
__attribute__((section(".stage3_build_id")))
uint64_t stage3_build_id = BUILD_ID;
__attribute__((section(".stage3_entry")))
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#endif
__attribute__((noreturn))
void stage3_common(void) {
init_flush_irqs();
init_io_apics();
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volume_iterate_parts(boot_volume,
if (!init_config_disk(_PART)) {
boot_volume = _PART;
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break;
}
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);
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char *verbose_str = config_get_value(NULL, 0, "VERBOSE");
verbose = verbose_str != NULL && strcmp(verbose_str, "yes") == 0;
char *randomise_mem_str = config_get_value(NULL, 0, "RANDOMISE_MEMORY");
if (randomise_mem_str == NULL)
randomise_mem_str = config_get_value(NULL, 0, "RANDOMIZE_MEMORY");
bool randomise_mem = randomise_mem_str != NULL && strcmp(randomise_mem_str, "yes") == 0;
if (randomise_mem)
pmm_randomise_memory();
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if (verbose) {
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print("Boot drive: %x\n", boot_volume->index);
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print("Boot partition: %d\n", boot_volume->partition);
}
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char *cmdline;
char *config = menu(&cmdline);
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char *proto = config_get_value(config, 0, "PROTOCOL");
if (proto == NULL) {
panic("PROTOCOL not specified");
}
if (!strcmp(proto, "stivale")) {
stivale_load(config, cmdline);
} else if (!strcmp(proto, "stivale2")) {
#if bios == 1
void *efi_system_table = NULL;
#elif uefi == 1
void *efi_system_table = gST;
#endif
stivale2_load(config, cmdline, boot_volume->pxe, efi_system_table);
} else if (!strcmp(proto, "linux")) {
linux_load(config, cmdline);
} else if (!strcmp(proto, "chainload")) {
chainload(config);
} else if (!strcmp(proto, "multiboot1") || !strcmp(proto, "multiboot")) {
multiboot1_load(config, cmdline);
} else if (!strcmp(proto, "multiboot2")) {
multiboot2_load(config, cmdline);
}
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panic("Invalid protocol specified");
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}