1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include <linux/efi.h> 4 #include <linux/sysfb.h> 5 6 #include <asm/efi.h> 7 8 #include "efistub.h" 9 10 static unsigned long kernel_image_offset; 11 12 static void *kernel_image_addr(void *addr) 13 { 14 return addr + kernel_image_offset; 15 } 16 17 struct sysfb_display_info *alloc_primary_display(void) 18 { 19 if (IS_ENABLED(CONFIG_ARM)) 20 return __alloc_primary_display(); 21 22 if (IS_ENABLED(CONFIG_X86) || 23 IS_ENABLED(CONFIG_EFI_EARLYCON) || 24 IS_ENABLED(CONFIG_SYSFB)) 25 return kernel_image_addr(&sysfb_primary_display); 26 27 return NULL; 28 } 29 30 /* 31 * EFI entry point for the generic EFI stub used by ARM, arm64, RISC-V and 32 * LoongArch. This is the entrypoint that is described in the PE/COFF header 33 * of the core kernel. 34 */ 35 efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, 36 efi_system_table_t *systab) 37 { 38 efi_loaded_image_t *image; 39 efi_status_t status; 40 unsigned long image_addr; 41 unsigned long image_size = 0; 42 /* addr/point and size pairs for memory management*/ 43 char *cmdline_ptr = NULL; 44 efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID; 45 unsigned long reserve_addr = 0; 46 unsigned long reserve_size = 0; 47 48 WRITE_ONCE(efi_system_table, systab); 49 50 /* Check if we were booted by the EFI firmware */ 51 if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 52 return EFI_INVALID_PARAMETER; 53 54 /* 55 * Get a handle to the loaded image protocol. This is used to get 56 * information about the running image, such as size and the command 57 * line. 58 */ 59 status = efi_bs_call(handle_protocol, handle, &loaded_image_proto, 60 (void *)&image); 61 if (status != EFI_SUCCESS) { 62 efi_err("Failed to get loaded image protocol\n"); 63 return status; 64 } 65 66 status = efi_handle_cmdline(image, &cmdline_ptr); 67 if (status != EFI_SUCCESS) 68 return status; 69 70 efi_info("Booting Linux Kernel...\n"); 71 72 status = handle_kernel_image(&image_addr, &image_size, 73 &reserve_addr, 74 &reserve_size, 75 image, handle); 76 if (status != EFI_SUCCESS) { 77 efi_err("Failed to relocate kernel\n"); 78 return status; 79 } 80 81 kernel_image_offset = image_addr - (unsigned long)image->image_base; 82 83 status = efi_stub_common(handle, image, image_addr, cmdline_ptr); 84 85 efi_free(image_size, image_addr); 86 efi_free(reserve_size, reserve_addr); 87 88 return status; 89 } 90