258 lines
6.4 KiB
C
258 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Extensible Firmware Interface
|
|
*
|
|
* Based on Extensible Firmware Interface Specification version 2.4
|
|
*
|
|
* Copyright (C) 2013 - 2015 Linaro Ltd.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "efi: " fmt
|
|
|
|
#include <linux/efi.h>
|
|
#include <linux/fwnode.h>
|
|
#include <linux/init.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/mm_types.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/screen_info.h>
|
|
|
|
#include <asm/efi.h>
|
|
|
|
unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR;
|
|
|
|
static int __init is_memory(efi_memory_desc_t *md)
|
|
{
|
|
if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Translate a EFI virtual address into a physical address: this is necessary,
|
|
* as some data members of the EFI system table are virtually remapped after
|
|
* SetVirtualAddressMap() has been called.
|
|
*/
|
|
static phys_addr_t __init efi_to_phys(unsigned long addr)
|
|
{
|
|
efi_memory_desc_t *md;
|
|
|
|
for_each_efi_memory_desc(md) {
|
|
if (!(md->attribute & EFI_MEMORY_RUNTIME))
|
|
continue;
|
|
if (md->virt_addr == 0)
|
|
/* no virtual mapping has been installed by the stub */
|
|
break;
|
|
if (md->virt_addr <= addr &&
|
|
(addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT))
|
|
return md->phys_addr + addr - md->virt_addr;
|
|
}
|
|
return addr;
|
|
}
|
|
|
|
extern __weak const efi_config_table_type_t efi_arch_tables[];
|
|
|
|
/*
|
|
* x86 defines its own screen_info and uses it even without EFI,
|
|
* everything else can get it from here.
|
|
*/
|
|
#if !defined(CONFIG_X86) && (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) {
|
|
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));
|
|
|
|
if (memblock_is_map_memory(screen_info.lfb_base))
|
|
memblock_mark_nomap(screen_info.lfb_base,
|
|
screen_info.lfb_size);
|
|
|
|
if (IS_ENABLED(CONFIG_EFI_EARLYCON))
|
|
efi_earlycon_reprobe();
|
|
}
|
|
}
|
|
|
|
static int __init uefi_init(u64 efi_system_table)
|
|
{
|
|
efi_config_table_t *config_tables;
|
|
efi_system_table_t *systab;
|
|
size_t table_size;
|
|
int retval;
|
|
|
|
systab = early_memremap_ro(efi_system_table, sizeof(efi_system_table_t));
|
|
if (systab == NULL) {
|
|
pr_warn("Unable to map EFI system table.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
set_bit(EFI_BOOT, &efi.flags);
|
|
if (IS_ENABLED(CONFIG_64BIT))
|
|
set_bit(EFI_64BIT, &efi.flags);
|
|
|
|
retval = efi_systab_check_header(&systab->hdr);
|
|
if (retval)
|
|
goto out;
|
|
|
|
efi.runtime = systab->runtime;
|
|
efi.runtime_version = systab->hdr.revision;
|
|
|
|
efi_systab_report_header(&systab->hdr, efi_to_phys(systab->fw_vendor));
|
|
|
|
table_size = sizeof(efi_config_table_t) * systab->nr_tables;
|
|
config_tables = early_memremap_ro(efi_to_phys(systab->tables),
|
|
table_size);
|
|
if (config_tables == NULL) {
|
|
pr_warn("Unable to map EFI config table array.\n");
|
|
retval = -ENOMEM;
|
|
goto out;
|
|
}
|
|
retval = efi_config_parse_tables(config_tables, systab->nr_tables,
|
|
efi_arch_tables);
|
|
|
|
early_memunmap(config_tables, table_size);
|
|
out:
|
|
early_memunmap(systab, sizeof(efi_system_table_t));
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Return true for regions that can be used as System RAM.
|
|
*/
|
|
static __init int is_usable_memory(efi_memory_desc_t *md)
|
|
{
|
|
switch (md->type) {
|
|
case EFI_LOADER_CODE:
|
|
case EFI_LOADER_DATA:
|
|
case EFI_ACPI_RECLAIM_MEMORY:
|
|
case EFI_BOOT_SERVICES_CODE:
|
|
case EFI_BOOT_SERVICES_DATA:
|
|
case EFI_CONVENTIONAL_MEMORY:
|
|
case EFI_PERSISTENT_MEMORY:
|
|
/*
|
|
* According to the spec, these regions are no longer reserved
|
|
* after calling ExitBootServices(). However, we can only use
|
|
* them as System RAM if they can be mapped writeback cacheable.
|
|
*/
|
|
return (md->attribute & EFI_MEMORY_WB);
|
|
default:
|
|
break;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static __init void reserve_regions(void)
|
|
{
|
|
efi_memory_desc_t *md;
|
|
u64 paddr, npages, size;
|
|
|
|
if (efi_enabled(EFI_DBG))
|
|
pr_info("Processing EFI memory map:\n");
|
|
|
|
/*
|
|
* Discard memblocks discovered so far: if there are any at this
|
|
* point, they originate from memory nodes in the DT, and UEFI
|
|
* uses its own memory map instead.
|
|
*/
|
|
memblock_dump_all();
|
|
memblock_remove(0, PHYS_ADDR_MAX);
|
|
|
|
for_each_efi_memory_desc(md) {
|
|
paddr = md->phys_addr;
|
|
npages = md->num_pages;
|
|
|
|
if (efi_enabled(EFI_DBG)) {
|
|
char buf[64];
|
|
|
|
pr_info(" 0x%012llx-0x%012llx %s\n",
|
|
paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
|
|
efi_md_typeattr_format(buf, sizeof(buf), md));
|
|
}
|
|
|
|
memrange_efi_to_native(&paddr, &npages);
|
|
size = npages << PAGE_SHIFT;
|
|
|
|
if (is_memory(md)) {
|
|
/*
|
|
* Special purpose memory is 'soft reserved', which
|
|
* means it is set aside initially. Don't add a memblock
|
|
* for it now so that it can be hotplugged back in or
|
|
* be assigned to the dax driver after boot.
|
|
*/
|
|
if (efi_soft_reserve_enabled() &&
|
|
(md->attribute & EFI_MEMORY_SP))
|
|
continue;
|
|
|
|
early_init_dt_add_memory_arch(paddr, size);
|
|
|
|
if (!is_usable_memory(md))
|
|
memblock_mark_nomap(paddr, size);
|
|
|
|
/* keep ACPI reclaim memory intact for kexec etc. */
|
|
if (md->type == EFI_ACPI_RECLAIM_MEMORY)
|
|
memblock_reserve(paddr, size);
|
|
}
|
|
}
|
|
}
|
|
|
|
void __init efi_init(void)
|
|
{
|
|
struct efi_memory_map_data data;
|
|
u64 efi_system_table;
|
|
|
|
/* Grab UEFI information placed in FDT by stub */
|
|
efi_system_table = efi_get_fdt_params(&data);
|
|
if (!efi_system_table)
|
|
return;
|
|
|
|
if (efi_memmap_init_early(&data) < 0) {
|
|
/*
|
|
* If we are booting via UEFI, the UEFI memory map is the only
|
|
* description of memory we have, so there is little point in
|
|
* proceeding if we cannot access it.
|
|
*/
|
|
panic("Unable to map EFI memory map.\n");
|
|
}
|
|
|
|
WARN(efi.memmap.desc_version != 1,
|
|
"Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
|
|
efi.memmap.desc_version);
|
|
|
|
if (uefi_init(efi_system_table) < 0) {
|
|
efi_memmap_unmap();
|
|
return;
|
|
}
|
|
|
|
reserve_regions();
|
|
/*
|
|
* For memblock manipulation, the cap should come after the memblock_add().
|
|
* And now, memblock is fully populated, it is time to do capping.
|
|
*/
|
|
early_init_dt_check_for_usable_mem_range();
|
|
efi_find_mirror();
|
|
efi_esrt_init();
|
|
efi_mokvar_table_init();
|
|
|
|
memblock_reserve(data.phys_map & PAGE_MASK,
|
|
PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK)));
|
|
|
|
if (IS_ENABLED(CONFIG_X86) ||
|
|
IS_ENABLED(CONFIG_SYSFB) ||
|
|
IS_ENABLED(CONFIG_EFI_EARLYCON))
|
|
init_screen_info();
|
|
}
|