85 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2 3#include <linux/efi.h>4#include <linux/screen_info.h>5 6#include <asm/efi.h>7 8#include "efistub.h"9 10static unsigned long screen_info_offset;11 12struct 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 and27 * LoongArch. This is the entrypoint that is described in the PE/COFF header28 * of the core kernel.29 */30efi_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 get51 * information about the running image, such as size and the command52 * 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