mirror of https://gitee.com/openkylin/linux.git
274 lines
6.8 KiB
C
274 lines
6.8 KiB
C
/*
|
|
* Extensible Firmware Interface
|
|
*
|
|
* Based on Extensible Firmware Interface Specification version 2.4
|
|
*
|
|
* Copyright (C) 2013 - 2015 Linaro Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "efi: " fmt
|
|
|
|
#include <linux/efi.h>
|
|
#include <linux/init.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/mm_types.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/screen_info.h>
|
|
|
|
#include <asm/efi.h>
|
|
|
|
u64 efi_system_table;
|
|
|
|
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 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;
|
|
}
|
|
|
|
static __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR;
|
|
|
|
static __initdata efi_config_table_type_t arch_tables[] = {
|
|
{LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, NULL, &screen_info_table},
|
|
{NULL_GUID, NULL, NULL}
|
|
};
|
|
|
|
static void __init init_screen_info(void)
|
|
{
|
|
struct screen_info *si;
|
|
|
|
if (screen_info_table != EFI_INVALID_TABLE_ADDR) {
|
|
si = early_memremap_ro(screen_info_table, sizeof(*si));
|
|
if (!si) {
|
|
pr_err("Could not map screen_info config table\n");
|
|
return;
|
|
}
|
|
screen_info = *si;
|
|
early_memunmap(si, sizeof(*si));
|
|
|
|
/* dummycon on ARM needs non-zero values for columns/lines */
|
|
screen_info.orig_video_cols = 80;
|
|
screen_info.orig_video_lines = 25;
|
|
}
|
|
|
|
if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
|
|
memblock_is_map_memory(screen_info.lfb_base))
|
|
memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size);
|
|
}
|
|
|
|
static int __init uefi_init(void)
|
|
{
|
|
efi_char16_t *c16;
|
|
void *config_tables;
|
|
size_t table_size;
|
|
char vendor[100] = "unknown";
|
|
int i, retval;
|
|
|
|
efi.systab = early_memremap_ro(efi_system_table,
|
|
sizeof(efi_system_table_t));
|
|
if (efi.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);
|
|
|
|
/*
|
|
* Verify the EFI Table
|
|
*/
|
|
if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
|
|
pr_err("System table signature incorrect\n");
|
|
retval = -EINVAL;
|
|
goto out;
|
|
}
|
|
if ((efi.systab->hdr.revision >> 16) < 2)
|
|
pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n",
|
|
efi.systab->hdr.revision >> 16,
|
|
efi.systab->hdr.revision & 0xffff);
|
|
|
|
efi.runtime_version = efi.systab->hdr.revision;
|
|
|
|
/* Show what we know for posterity */
|
|
c16 = early_memremap_ro(efi_to_phys(efi.systab->fw_vendor),
|
|
sizeof(vendor) * sizeof(efi_char16_t));
|
|
if (c16) {
|
|
for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i)
|
|
vendor[i] = c16[i];
|
|
vendor[i] = '\0';
|
|
early_memunmap(c16, sizeof(vendor) * sizeof(efi_char16_t));
|
|
}
|
|
|
|
pr_info("EFI v%u.%.02u by %s\n",
|
|
efi.systab->hdr.revision >> 16,
|
|
efi.systab->hdr.revision & 0xffff, vendor);
|
|
|
|
table_size = sizeof(efi_config_table_64_t) * efi.systab->nr_tables;
|
|
config_tables = early_memremap_ro(efi_to_phys(efi.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, efi.systab->nr_tables,
|
|
sizeof(efi_config_table_t),
|
|
arch_tables);
|
|
|
|
early_memunmap(config_tables, table_size);
|
|
out:
|
|
early_memunmap(efi.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_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_t)ULLONG_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)) {
|
|
early_init_dt_add_memory_arch(paddr, size);
|
|
|
|
if (!is_usable_memory(md))
|
|
memblock_mark_nomap(paddr, size);
|
|
}
|
|
}
|
|
}
|
|
|
|
void __init efi_init(void)
|
|
{
|
|
struct efi_memory_map_data data;
|
|
struct efi_fdt_params params;
|
|
|
|
/* Grab UEFI information placed in FDT by stub */
|
|
if (!efi_get_fdt_params(¶ms))
|
|
return;
|
|
|
|
efi_system_table = params.system_table;
|
|
|
|
data.desc_version = params.desc_ver;
|
|
data.desc_size = params.desc_size;
|
|
data.size = params.mmap_size;
|
|
data.phys_map = params.mmap;
|
|
|
|
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() < 0)
|
|
return;
|
|
|
|
reserve_regions();
|
|
efi_memattr_init();
|
|
efi_esrt_init();
|
|
efi_memmap_unmap();
|
|
|
|
memblock_reserve(params.mmap & PAGE_MASK,
|
|
PAGE_ALIGN(params.mmap_size +
|
|
(params.mmap & ~PAGE_MASK)));
|
|
|
|
init_screen_info();
|
|
}
|
|
|
|
static int __init register_gop_device(void)
|
|
{
|
|
void *pd;
|
|
|
|
if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
|
|
return 0;
|
|
|
|
pd = platform_device_register_data(NULL, "efi-framebuffer", 0,
|
|
&screen_info, sizeof(screen_info));
|
|
return PTR_ERR_OR_ZERO(pd);
|
|
}
|
|
subsys_initcall(register_gop_device);
|