1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include <linux/efi.h> 4 #include <asm/efi.h> 5 6 #include "efistub.h" 7 8 /* 9 * EFI entry point for the generic EFI stub used by ARM, arm64, RISC-V and 10 * LoongArch. This is the entrypoint that is described in the PE/COFF header 11 * of the core kernel. 12 */ 13 efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, 14 efi_system_table_t *systab) 15 { 16 efi_loaded_image_t *image; 17 efi_status_t status; 18 unsigned long image_addr; 19 unsigned long image_size = 0; 20 /* addr/point and size pairs for memory management*/ 21 char *cmdline_ptr = NULL; 22 efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID; 23 unsigned long reserve_addr = 0; 24 unsigned long reserve_size = 0; 25 26 WRITE_ONCE(efi_system_table, systab); 27 28 /* Check if we were booted by the EFI firmware */ 29 if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 30 return EFI_INVALID_PARAMETER; 31 32 /* 33 * Get a handle to the loaded image protocol. This is used to get 34 * information about the running image, such as size and the command 35 * line. 36 */ 37 status = efi_bs_call(handle_protocol, handle, &loaded_image_proto, 38 (void *)&image); 39 if (status != EFI_SUCCESS) { 40 efi_err("Failed to get loaded image protocol\n"); 41 return status; 42 } 43 44 status = efi_handle_cmdline(image, &cmdline_ptr); 45 if (status != EFI_SUCCESS) 46 return status; 47 48 efi_info("Booting Linux Kernel...\n"); 49 50 status = handle_kernel_image(&image_addr, &image_size, 51 &reserve_addr, 52 &reserve_size, 53 image, handle); 54 if (status != EFI_SUCCESS) { 55 efi_err("Failed to relocate kernel\n"); 56 return status; 57 } 58 59 status = efi_stub_common(handle, image, image_addr, cmdline_ptr); 60 61 efi_free(image_size, image_addr); 62 efi_free(reserve_size, reserve_addr); 63 64 return status; 65 } 66