2015-11-30 12:28:18 +00:00
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/*
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* Extensible Firmware Interface
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*
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* Based on Extensible Firmware Interface Specification version 2.4
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*
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* Copyright (C) 2013 - 2015 Linaro Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/efi.h>
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#include <linux/init.h>
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#include <linux/memblock.h>
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#include <linux/mm_types.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <asm/efi.h>
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struct efi_memory_map memmap;
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u64 efi_system_table;
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static int __init is_normal_ram(efi_memory_desc_t *md)
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{
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if (md->attribute & EFI_MEMORY_WB)
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return 1;
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return 0;
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}
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/*
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* Translate a EFI virtual address into a physical address: this is necessary,
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* as some data members of the EFI system table are virtually remapped after
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* SetVirtualAddressMap() has been called.
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*/
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static phys_addr_t efi_to_phys(unsigned long addr)
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{
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efi_memory_desc_t *md;
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for_each_efi_memory_desc(&memmap, md) {
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if (!(md->attribute & EFI_MEMORY_RUNTIME))
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continue;
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if (md->virt_addr == 0)
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/* no virtual mapping has been installed by the stub */
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break;
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if (md->virt_addr <= addr &&
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(addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT))
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return md->phys_addr + addr - md->virt_addr;
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}
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return addr;
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}
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static int __init uefi_init(void)
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{
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efi_char16_t *c16;
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void *config_tables;
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2015-11-30 12:28:19 +00:00
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size_t table_size;
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2015-11-30 12:28:18 +00:00
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char vendor[100] = "unknown";
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int i, retval;
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efi.systab = early_memremap(efi_system_table,
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sizeof(efi_system_table_t));
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if (efi.systab == NULL) {
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pr_warn("Unable to map EFI system table.\n");
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return -ENOMEM;
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}
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set_bit(EFI_BOOT, &efi.flags);
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2015-11-30 12:28:19 +00:00
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if (IS_ENABLED(CONFIG_64BIT))
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set_bit(EFI_64BIT, &efi.flags);
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2015-11-30 12:28:18 +00:00
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/*
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* Verify the EFI Table
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*/
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if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
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pr_err("System table signature incorrect\n");
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retval = -EINVAL;
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goto out;
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}
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if ((efi.systab->hdr.revision >> 16) < 2)
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pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n",
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efi.systab->hdr.revision >> 16,
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efi.systab->hdr.revision & 0xffff);
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/* Show what we know for posterity */
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c16 = early_memremap(efi_to_phys(efi.systab->fw_vendor),
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sizeof(vendor) * sizeof(efi_char16_t));
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if (c16) {
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for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i)
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vendor[i] = c16[i];
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vendor[i] = '\0';
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early_memunmap(c16, sizeof(vendor) * sizeof(efi_char16_t));
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}
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pr_info("EFI v%u.%.02u by %s\n",
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efi.systab->hdr.revision >> 16,
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efi.systab->hdr.revision & 0xffff, vendor);
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table_size = sizeof(efi_config_table_64_t) * efi.systab->nr_tables;
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config_tables = early_memremap(efi_to_phys(efi.systab->tables),
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table_size);
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if (config_tables == NULL) {
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pr_warn("Unable to map EFI config table array.\n");
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retval = -ENOMEM;
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goto out;
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}
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retval = efi_config_parse_tables(config_tables, efi.systab->nr_tables,
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2015-11-30 12:28:19 +00:00
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sizeof(efi_config_table_t), NULL);
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2015-11-30 12:28:18 +00:00
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early_memunmap(config_tables, table_size);
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out:
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early_memunmap(efi.systab, sizeof(efi_system_table_t));
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return retval;
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}
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/*
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* Return true for RAM regions we want to permanently reserve.
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*/
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static __init int is_reserve_region(efi_memory_desc_t *md)
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{
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switch (md->type) {
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case EFI_LOADER_CODE:
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case EFI_LOADER_DATA:
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case EFI_BOOT_SERVICES_CODE:
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case EFI_BOOT_SERVICES_DATA:
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case EFI_CONVENTIONAL_MEMORY:
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case EFI_PERSISTENT_MEMORY:
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return 0;
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default:
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break;
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}
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return is_normal_ram(md);
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}
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static __init void reserve_regions(void)
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{
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efi_memory_desc_t *md;
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u64 paddr, npages, size;
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if (efi_enabled(EFI_DBG))
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pr_info("Processing EFI memory map:\n");
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for_each_efi_memory_desc(&memmap, md) {
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paddr = md->phys_addr;
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npages = md->num_pages;
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if (efi_enabled(EFI_DBG)) {
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char buf[64];
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pr_info(" 0x%012llx-0x%012llx %s",
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paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
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efi_md_typeattr_format(buf, sizeof(buf), md));
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}
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memrange_efi_to_native(&paddr, &npages);
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size = npages << PAGE_SHIFT;
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if (is_normal_ram(md))
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early_init_dt_add_memory_arch(paddr, size);
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if (is_reserve_region(md)) {
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memblock_mark_nomap(paddr, size);
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if (efi_enabled(EFI_DBG))
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pr_cont("*");
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}
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if (efi_enabled(EFI_DBG))
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pr_cont("\n");
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}
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set_bit(EFI_MEMMAP, &efi.flags);
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}
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void __init efi_init(void)
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{
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struct efi_fdt_params params;
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/* Grab UEFI information placed in FDT by stub */
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if (!efi_get_fdt_params(¶ms))
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return;
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efi_system_table = params.system_table;
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memmap.phys_map = params.mmap;
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memmap.map = early_memremap(params.mmap, params.mmap_size);
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if (memmap.map == NULL) {
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/*
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* If we are booting via UEFI, the UEFI memory map is the only
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* description of memory we have, so there is little point in
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* proceeding if we cannot access it.
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*/
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panic("Unable to map EFI memory map.\n");
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}
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memmap.map_end = memmap.map + params.mmap_size;
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memmap.desc_size = params.desc_size;
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memmap.desc_version = params.desc_ver;
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if (uefi_init() < 0)
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return;
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reserve_regions();
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early_memunmap(memmap.map, params.mmap_size);
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memblock_mark_nomap(params.mmap & PAGE_MASK,
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PAGE_ALIGN(params.mmap_size +
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(params.mmap & ~PAGE_MASK)));
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}
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