cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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efi.c (1797B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * EFI initialization
      4 *
      5 * Author: Jianmin Lv <lvjianmin@loongson.cn>
      6 *         Huacai Chen <chenhuacai@loongson.cn>
      7 *
      8 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
      9 */
     10
     11#include <linux/acpi.h>
     12#include <linux/efi.h>
     13#include <linux/efi-bgrt.h>
     14#include <linux/init.h>
     15#include <linux/kernel.h>
     16#include <linux/export.h>
     17#include <linux/io.h>
     18#include <linux/kobject.h>
     19#include <linux/memblock.h>
     20#include <linux/reboot.h>
     21#include <linux/uaccess.h>
     22
     23#include <asm/early_ioremap.h>
     24#include <asm/efi.h>
     25#include <asm/loongson.h>
     26
     27static unsigned long efi_nr_tables;
     28static unsigned long efi_config_table;
     29
     30static efi_system_table_t *efi_systab;
     31static efi_config_table_type_t arch_tables[] __initdata = {{},};
     32
     33void __init efi_runtime_init(void)
     34{
     35	if (!efi_enabled(EFI_BOOT))
     36		return;
     37
     38	if (efi_runtime_disabled()) {
     39		pr_info("EFI runtime services will be disabled.\n");
     40		return;
     41	}
     42
     43	efi.runtime = (efi_runtime_services_t *)efi_systab->runtime;
     44	efi.runtime_version = (unsigned int)efi.runtime->hdr.revision;
     45
     46	efi_native_runtime_setup();
     47	set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
     48}
     49
     50void __init efi_init(void)
     51{
     52	int size;
     53	void *config_tables;
     54
     55	if (!efi_system_table)
     56		return;
     57
     58	efi_systab = (efi_system_table_t *)early_memremap_ro(efi_system_table, sizeof(*efi_systab));
     59	if (!efi_systab) {
     60		pr_err("Can't find EFI system table.\n");
     61		return;
     62	}
     63
     64	set_bit(EFI_64BIT, &efi.flags);
     65	efi_nr_tables	 = efi_systab->nr_tables;
     66	efi_config_table = (unsigned long)efi_systab->tables;
     67
     68	size = sizeof(efi_config_table_t);
     69	config_tables = early_memremap(efi_config_table, efi_nr_tables * size);
     70	efi_config_parse_tables(config_tables, efi_systab->nr_tables, arch_tables);
     71	early_memunmap(config_tables, efi_nr_tables * size);
     72}