drivers/firmware/efi/libstub/riscv-stub.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2020 Western Digital Corporation or its affiliates.
   4  */
   5
   6 #include <linux/efi.h>
   7
   8 #include <asm/efi.h>
   9 #include <asm/sections.h>
  10 #include <asm/unaligned.h>
  11
  12 #include "efistub.h"
  13
  14 unsigned long stext_offset(void)
  15 {
  16         /*
  17          * When built as part of the kernel, the EFI stub cannot branch to the
  18          * kernel proper via the image header, as the PE/COFF header is
  19          * strictly not part of the in-memory presentation of the image, only
  20          * of the file representation. So instead, we need to jump to the
  21          * actual entrypoint in the .text region of the image.
  22          */
  23         return _start_kernel - _start;
  24 }
  25
  26 efi_status_t handle_kernel_image(unsigned long *image_addr,
  27                                  unsigned long *image_size,
  28                                  unsigned long *reserve_addr,
  29                                  unsigned long *reserve_size,
  30                                  efi_loaded_image_t *image,
  31                                  efi_handle_t image_handle)
  32 {
  33         unsigned long kernel_size, kernel_codesize, kernel_memsize;
  34         efi_status_t status;
  35
  36         kernel_size = _edata - _start;
  37         kernel_codesize = __init_text_end - _start;
  38         kernel_memsize = kernel_size + (_end - _edata);
  39         *image_addr = (unsigned long)_start;
  40         *image_size = kernel_memsize;
  41         *reserve_size = *image_size;
  42
  43         status = efi_kaslr_relocate_kernel(image_addr,
  44                                            reserve_addr, reserve_size,
  45                                            kernel_size, kernel_codesize, kernel_memsize,
  46                                            efi_kaslr_get_phys_seed(image_handle));
  47         if (status != EFI_SUCCESS) {
  48                 efi_err("Failed to relocate kernel\n");
  49                 *image_size = 0;
  50         }
  51
  52         return status;
  53 }
  54
  55 void efi_icache_sync(unsigned long start, unsigned long end)
  56 {
  57         asm volatile ("fence.i" ::: "memory");
  58 }