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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <efi.h>
#include <efilib.h>
#include "linux.h"
#include "util.h"
#ifdef __i386__
#define __regparm0__ __attribute__((regparm(0)))
#else
#define __regparm0__
#endif
typedef VOID(*handover_f)(VOID *image, EFI_SYSTEM_TABLE *table, struct boot_params *params) __regparm0__;
static VOID linux_efi_handover(EFI_HANDLE image, struct boot_params *params) {
handover_f handover;
UINTN start = (UINTN)params->hdr.code32_start;
#ifdef __x86_64__
asm volatile ("cli");
start += 512;
#endif
handover = (handover_f)(start + params->hdr.handover_offset);
handover(image, ST, params);
}
EFI_STATUS linux_exec(EFI_HANDLE *image,
CHAR8 *cmdline, UINTN cmdline_len,
UINTN linux_addr,
UINTN initrd_addr, UINTN initrd_size) {
struct boot_params *image_params;
struct boot_params *boot_params;
UINT8 setup_sectors;
EFI_PHYSICAL_ADDRESS addr;
EFI_STATUS err;
image_params = (struct boot_params *) linux_addr;
if (image_params->hdr.boot_flag != 0xAA55 ||
image_params->hdr.header != SETUP_MAGIC ||
image_params->hdr.version < 0x20b ||
!image_params->hdr.relocatable_kernel)
return EFI_LOAD_ERROR;
boot_params = (struct boot_params *) 0xFFFFFFFF;
err = uefi_call_wrapper(BS->AllocatePages, 4, AllocateMaxAddress, EfiLoaderData,
EFI_SIZE_TO_PAGES(0x4000), (EFI_PHYSICAL_ADDRESS*) &boot_params);
if (EFI_ERROR(err))
return err;
ZeroMem(boot_params, 0x4000);
CopyMem(&boot_params->hdr, &image_params->hdr, sizeof(struct setup_header));
boot_params->hdr.type_of_loader = 0xff;
setup_sectors = image_params->hdr.setup_sects > 0 ? image_params->hdr.setup_sects : 4;
boot_params->hdr.code32_start = (UINT32)linux_addr + (setup_sectors + 1) * 512;
if (cmdline) {
addr = 0xA0000;
err = uefi_call_wrapper(BS->AllocatePages, 4, AllocateMaxAddress, EfiLoaderData,
EFI_SIZE_TO_PAGES(cmdline_len + 1), &addr);
if (EFI_ERROR(err))
return err;
CopyMem((VOID *)(UINTN)addr, cmdline, cmdline_len);
((CHAR8 *)(UINTN)addr)[cmdline_len] = 0;
boot_params->hdr.cmd_line_ptr = (UINT32)addr;
}
boot_params->hdr.ramdisk_image = (UINT32)initrd_addr;
boot_params->hdr.ramdisk_size = (UINT32)initrd_size;
linux_efi_handover(image, boot_params);
return EFI_LOAD_ERROR;
}
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