1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include <linux/efi.h> 4 #include <linux/screen_info.h> 5 6 #include <asm/efi.h> 7 8 #include "efistub.h" 9 10 static unsigned long screen_info_offset; 11 12 struct screen_info *alloc_screen_info(void) 13 { 14 if (IS_ENABLED(CONFIG_ARM)) 15 return __alloc_screen_info(); 16 17 if (IS_ENABLED(CONFIG_X86) || 18 IS_ENABLED(CONFIG_EFI_EARLYCON) || 19 IS_ENABLED(CONFIG_SYSFB)) 20 return (void *)&screen_info + screen_info_offset; 21 22 return NULL; 23 } 24 25 /* 26 * EFI entry point for the generic EFI stub used by ARM, arm64, RISC-V and 27 * LoongArch. This is the entrypoint that is described in the PE/COFF header 28 * of the core kernel. 29 */ 30 efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, 31 efi_system_table_t *systab) 32 { 33 efi_loaded_image_t *image; 34 efi_status_t status; 35 unsigned long image_addr; 36 unsigned long image_size = 0; 37 /* addr/point and size pairs for memory management*/ 38 char *cmdline_ptr = NULL; 39 efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID; 40 unsigned long reserve_addr = 0; 41 unsigned long reserve_size = 0; 42 43 WRITE_ONCE(efi_system_table, systab); 44 45 /* Check if we were booted by the EFI firmware */ 46 if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 47 return EFI_INVALID_PARAMETER; 48 49 /* 50 * Get a handle to the loaded image protocol. This is used to get 51 * information about the running image, such as size and the command 52 * line. 53 */ 54 status = efi_bs_call(handle_protocol, handle, &loaded_image_proto, 55 (void *)&image); 56 if (status != EFI_SUCCESS) { 57 efi_err("Failed to get loaded image protocol\n"); 58 return status; 59 } 60 61 status = efi_handle_cmdline(image, &cmdline_ptr); 62 if (status != EFI_SUCCESS) 63 return status; 64 65 efi_info("Booting Linux Kernel...\n"); 66 67 status = handle_kernel_image(&image_addr, &image_size, 68 &reserve_addr, 69 &reserve_size, 70 image, handle); 71 if (status != EFI_SUCCESS) { 72 efi_err("Failed to relocate kernel\n"); 73 return status; 74 } 75 76 screen_info_offset = image_addr - (unsigned long)image->image_base; 77 78 status = efi_stub_common(handle, image, image_addr, cmdline_ptr); 79 80 efi_free(image_size, image_addr); 81 efi_free(reserve_size, reserve_addr); 82 83 return status; 84 } 85