282 lines
7.0 KiB
C
282 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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#define pr_fmt(fmt) "efi: " fmt
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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 <linux/platform_device.h>
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#include <linux/screen_info.h>
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#include <asm/efi.h>
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u64 efi_system_table;
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static int __init is_memory(efi_memory_desc_t *md)
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{
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if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC))
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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(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 __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR;
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static __initdata efi_config_table_type_t arch_tables[] = {
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{LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, NULL, &screen_info_table},
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{NULL_GUID, NULL, NULL}
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};
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static void __init init_screen_info(void)
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{
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struct screen_info *si;
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if (screen_info_table != EFI_INVALID_TABLE_ADDR) {
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si = early_memremap_ro(screen_info_table, sizeof(*si));
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if (!si) {
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pr_err("Could not map screen_info config table\n");
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return;
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}
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screen_info = *si;
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early_memunmap(si, sizeof(*si));
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/* dummycon on ARM needs non-zero values for columns/lines */
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screen_info.orig_video_cols = 80;
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screen_info.orig_video_lines = 25;
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}
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if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
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memblock_is_map_memory(screen_info.lfb_base))
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memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size);
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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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size_t table_size;
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char vendor[100] = "unknown";
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int i, retval;
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efi.systab = early_memremap_ro(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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if (IS_ENABLED(CONFIG_64BIT))
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set_bit(EFI_64BIT, &efi.flags);
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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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efi.runtime_version = efi.systab->hdr.revision;
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/* Show what we know for posterity */
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c16 = early_memremap_ro(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_ro(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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sizeof(efi_config_table_t),
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arch_tables);
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if (!retval)
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efi.config_table = (unsigned long)efi.systab->tables;
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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 regions that can be used as System RAM.
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*/
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static __init int is_usable_memory(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_ACPI_RECLAIM_MEMORY:
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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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/*
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* According to the spec, these regions are no longer reserved
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* after calling ExitBootServices(). However, we can only use
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* them as System RAM if they can be mapped writeback cacheable.
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*/
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return (md->attribute & EFI_MEMORY_WB);
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default:
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break;
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}
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return false;
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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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/*
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* Discard memblocks discovered so far: if there are any at this
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* point, they originate from memory nodes in the DT, and UEFI
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* uses its own memory map instead.
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*/
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memblock_dump_all();
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memblock_remove(0, PHYS_ADDR_MAX);
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for_each_efi_memory_desc(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\n",
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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_memory(md)) {
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early_init_dt_add_memory_arch(paddr, size);
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if (!is_usable_memory(md))
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memblock_mark_nomap(paddr, size);
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/* keep ACPI reclaim memory intact for kexec etc. */
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if (md->type == EFI_ACPI_RECLAIM_MEMORY)
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memblock_reserve(paddr, size);
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}
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}
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}
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void __init efi_init(void)
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{
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struct efi_memory_map_data data;
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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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data.desc_version = params.desc_ver;
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data.desc_size = params.desc_size;
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data.size = params.mmap_size;
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data.phys_map = params.mmap;
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if (efi_memmap_init_early(&data) < 0) {
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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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WARN(efi.memmap.desc_version != 1,
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"Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
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efi.memmap.desc_version);
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if (uefi_init() < 0) {
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efi_memmap_unmap();
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return;
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}
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reserve_regions();
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efi_esrt_init();
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memblock_reserve(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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init_screen_info();
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/* ARM does not permit early mappings to persist across paging_init() */
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if (IS_ENABLED(CONFIG_ARM))
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efi_memmap_unmap();
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}
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static int __init register_gop_device(void)
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{
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void *pd;
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if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
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return 0;
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pd = platform_device_register_data(NULL, "efi-framebuffer", 0,
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&screen_info, sizeof(screen_info));
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return PTR_ERR_OR_ZERO(pd);
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}
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subsys_initcall(register_gop_device);
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