limine/common/entry.s3.c
2022-10-06 06:05:37 +02:00

133 lines
3.4 KiB
C

#include <stddef.h>
#include <stdint.h>
#include <stdnoreturn.h>
#include <lib/term.h>
#include <lib/real.h>
#include <lib/misc.h>
#include <lib/libc.h>
#include <lib/part.h>
#include <lib/config.h>
#include <lib/trace.h>
#include <sys/e820.h>
#include <sys/a20.h>
#include <sys/idt.h>
#include <sys/gdt.h>
#include <lib/print.h>
#include <fs/file.h>
#include <lib/elf.h>
#include <mm/pmm.h>
#include <menu.h>
#include <pxe/pxe.h>
#include <pxe/tftp.h>
#include <drivers/disk.h>
#include <sys/lapic.h>
#include <lib/readline.h>
void stage3_common(void);
#if defined (UEFI)
extern symbol __image_base;
noreturn void uefi_entry(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
gST = SystemTable;
gBS = SystemTable->BootServices;
gRT = SystemTable->RuntimeServices;
efi_image_handle = ImageHandle;
EFI_STATUS status;
gST->ConOut->EnableCursor(gST->ConOut, false);
term_fallback();
status = gBS->SetWatchdogTimer(0, 0x10000, 0, NULL);
if (status) {
print("WARNING: Failed to disable watchdog timer!\n");
}
init_memmap();
#if defined (__x86_64__) || defined (__i386__)
init_gdt();
#endif
#if defined (__x86_64__)
if ((uintptr_t)__image_base > 0x100000000) {
panic(false, "Limine does not support being loaded above 4GiB");
}
#endif
disk_create_index();
boot_volume = NULL;
EFI_HANDLE current_handle = ImageHandle;
for (size_t j = 0; j < 25; j++) {
if (current_handle == NULL) {
could_not_match:
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;
bool old_cif = case_insensitive_fopen;
case_insensitive_fopen = true;
if ((f = fopen(volume_index[i], "/limine.cfg")) == NULL
&& (f = fopen(volume_index[i], "/boot/limine.cfg")) == NULL
&& (f = fopen(volume_index[i], "/EFI/BOOT/limine.cfg")) == NULL) {
case_insensitive_fopen = old_cif;
continue;
}
case_insensitive_fopen = old_cif;
fclose(f);
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(false, "No volume contained a Limine configuration file");
}
EFI_GUID loaded_img_prot_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
EFI_LOADED_IMAGE_PROTOCOL *loaded_image = NULL;
status = gBS->HandleProtocol(current_handle, &loaded_img_prot_guid,
(void **)&loaded_image);
if (status) {
goto could_not_match;
}
boot_volume = disk_volume_from_efi_handle(loaded_image->DeviceHandle);
if (boot_volume != NULL) {
stage3_common();
}
current_handle = loaded_image->ParentHandle;
}
goto could_not_match;
}
#endif
noreturn void stage3_common(void) {
#if defined (__x86_64__) || defined (__i386__)
init_flush_irqs();
init_io_apics();
#endif
menu(true);
}