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// SPDX-License-Identifier: GPL-2.0
/*
* EFI initialization
*
* Author: Jianmin Lv <lvjianmin@loongson.cn>
* Huacai Chen <chenhuacai@loongson.cn>
*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/efi-bgrt.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/io.h>
#include <linux/kobject.h>
#include <linux/memblock.h>
#include <linux/reboot.h>
#include <linux/screen_info.h>
#include <linux/uaccess.h>
#include <asm/early_ioremap.h>
#include <asm/efi.h>
#include <asm/loongson.h>
static unsigned long efi_nr_tables;
static unsigned long efi_config_table;
static unsigned long __initdata boot_memmap = EFI_INVALID_TABLE_ADDR;
static unsigned long __initdata fdt_pointer = EFI_INVALID_TABLE_ADDR;
static efi_system_table_t *efi_systab;
static efi_config_table_type_t arch_tables[] __initdata = {
{LINUX_EFI_BOOT_MEMMAP_GUID, &boot_memmap, "MEMMAP" },
{DEVICE_TREE_GUID, &fdt_pointer, "FDTPTR" },
{},
};
void __init *efi_fdt_pointer(void)
{
if (!efi_systab)
return NULL;
if (fdt_pointer == EFI_INVALID_TABLE_ADDR)
return NULL;
return early_memremap_ro(fdt_pointer, SZ_64K);
}
void __init efi_runtime_init(void)
{
if (!efi_enabled(EFI_BOOT) || !efi_systab->runtime)
return;
if (efi_runtime_disabled()) {
pr_info("EFI runtime services will be disabled.\n");
return;
}
efi.runtime = (efi_runtime_services_t *)efi_systab->runtime;
efi.runtime_version = (unsigned int)efi.runtime->hdr.revision;
efi_native_runtime_setup();
set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
}
bool efi_poweroff_required(void)
{
return efi_enabled(EFI_RUNTIME_SERVICES) &&
(acpi_gbl_reduced_hardware || acpi_no_s5);
}
unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR;
#if defined(CONFIG_SYSFB) || defined(CONFIG_EFI_EARLYCON)
struct screen_info screen_info __section(".data");
EXPORT_SYMBOL_GPL(screen_info);
#endif
static void __init init_screen_info(void)
{
struct screen_info *si;
if (screen_info_table == EFI_INVALID_TABLE_ADDR)
return;
si = early_memremap(screen_info_table, sizeof(*si));
if (!si) {
pr_err("Could not map screen_info config table\n");
return;
}
screen_info = *si;
memset(si, 0, sizeof(*si));
early_memunmap(si, sizeof(*si));
memblock_reserve(__screen_info_lfb_base(&screen_info), screen_info.lfb_size);
}
void __init efi_init(void)
{
int size;
void *config_tables;
struct efi_boot_memmap *tbl;
if (!efi_system_table)
return;
efi_systab = (efi_system_table_t *)early_memremap_ro(efi_system_table, sizeof(*efi_systab));
if (!efi_systab) {
pr_err("Can't find EFI system table.\n");
return;
}
efi_systab_report_header(&efi_systab->hdr, efi_systab->fw_vendor);
set_bit(EFI_64BIT, &efi.flags);
efi_nr_tables = efi_systab->nr_tables;
efi_config_table = (unsigned long)efi_systab->tables;
size = sizeof(efi_config_table_t);
config_tables = early_memremap(efi_config_table, efi_nr_tables * size);
efi_config_parse_tables(config_tables, efi_systab->nr_tables, arch_tables);
early_memunmap(config_tables, efi_nr_tables * size);
set_bit(EFI_CONFIG_TABLES, &efi.flags);
if (IS_ENABLED(CONFIG_EFI_EARLYCON) || IS_ENABLED(CONFIG_SYSFB))
init_screen_info();
if (boot_memmap == EFI_INVALID_TABLE_ADDR)
return;
tbl = early_memremap_ro(boot_memmap, sizeof(*tbl));
if (tbl) {
struct efi_memory_map_data data;
data.phys_map = boot_memmap + sizeof(*tbl);
data.size = tbl->map_size;
data.desc_size = tbl->desc_size;
data.desc_version = tbl->desc_ver;
if (efi_memmap_init_early(&data) < 0)
panic("Unable to map EFI memory map.\n");
/*
* Reserve the physical memory region occupied by the EFI
* memory map table (header + descriptors). This is crucial
* for kdump, as the kdump kernel relies on this original
* memmap passed by the bootloader. Without reservation,
* this region could be overwritten by the primary kernel.
* Also, set the EFI_PRESERVE_BS_REGIONS flag to indicate that
* critical boot services code/data regions like this are preserved.
*/
memblock_reserve((phys_addr_t)boot_memmap, sizeof(*tbl) + data.size);
set_bit(EFI_PRESERVE_BS_REGIONS, &efi.flags);
early_memunmap(tbl, sizeof(*tbl));
}
efi_esrt_init();
}
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