limine/common/entry.s3.c

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#include <stddef.h>
#include <stdint.h>
#include <stdnoreturn.h>
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#include <lib/term.h>
#include <lib/real.h>
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#include <lib/misc.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 <sys/gdt.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>
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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>
#include <lib/readline.h>
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void stage3_common(void);
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#if uefi == 1
extern symbol __image_base;
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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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status = gBS->SetWatchdogTimer(0, 0x10000, 0, NULL);
if (status) {
term_vbe(NULL, 0, 0);
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early_term = true;
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print("WARNING: Failed to disable watchdog timer!\n");
}
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term_notready();
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init_memmap();
#if defined (__x86_64__) || defined (__i386__)
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init_gdt();
#endif
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#if defined (__x86_64__)
if ((uintptr_t)__image_base > 0x100000000) {
panic(false, "Limine does not support being loaded above 4GiB");
}
#endif
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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) {
term_vbe(NULL, 0, 0);
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early_term = true;
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++) {
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struct file_handle *f;
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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) {
continue;
}
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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();
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panic(false, "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(false, "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
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noreturn void stage3_common(void) {
term_notready();
#if defined (__x86_64__) || defined (__i386__)
init_flush_irqs();
init_io_apics();
#endif
menu(true);
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}