355 строки
8.7 KiB
C
355 строки
8.7 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/fwnode.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_address.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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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 __init 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 const efi_config_table_type_t arch_tables[] __initconst = {
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{LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, &screen_info_table},
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{}
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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(u64 efi_system_table)
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{
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efi_config_table_t *config_tables;
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efi_system_table_t *systab;
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size_t table_size;
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int retval;
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systab = early_memremap_ro(efi_system_table, sizeof(efi_system_table_t));
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if (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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retval = efi_systab_check_header(&systab->hdr, 2);
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if (retval)
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goto out;
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efi.runtime = systab->runtime;
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efi.runtime_version = systab->hdr.revision;
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efi_systab_report_header(&systab->hdr, efi_to_phys(systab->fw_vendor));
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table_size = sizeof(efi_config_table_t) * systab->nr_tables;
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config_tables = early_memremap_ro(efi_to_phys(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, systab->nr_tables,
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arch_tables);
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early_memunmap(config_tables, table_size);
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out:
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early_memunmap(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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* Special purpose memory is 'soft reserved', which means it
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* is set aside initially, but can be hotplugged back in or
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* be assigned to the dax driver after boot.
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*/
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if (efi_soft_reserve_enabled() &&
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(md->attribute & EFI_MEMORY_SP))
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return false;
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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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u64 efi_system_table;
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/* Grab UEFI information placed in FDT by stub */
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efi_system_table = efi_get_fdt_params(&data);
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if (!efi_system_table)
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return;
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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(efi_system_table) < 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(data.phys_map & PAGE_MASK,
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PAGE_ALIGN(data.size + (data.phys_map & ~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 bool efifb_overlaps_pci_range(const struct of_pci_range *range)
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{
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u64 fb_base = screen_info.lfb_base;
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if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
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fb_base |= (u64)(unsigned long)screen_info.ext_lfb_base << 32;
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return fb_base >= range->cpu_addr &&
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fb_base < (range->cpu_addr + range->size);
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}
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static struct device_node *find_pci_overlap_node(void)
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{
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struct device_node *np;
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for_each_node_by_type(np, "pci") {
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struct of_pci_range_parser parser;
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struct of_pci_range range;
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int err;
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err = of_pci_range_parser_init(&parser, np);
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if (err) {
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pr_warn("of_pci_range_parser_init() failed: %d\n", err);
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continue;
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}
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for_each_of_pci_range(&parser, &range)
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if (efifb_overlaps_pci_range(&range))
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return np;
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}
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return NULL;
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}
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/*
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* If the efifb framebuffer is backed by a PCI graphics controller, we have
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* to ensure that this relation is expressed using a device link when
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* running in DT mode, or the probe order may be reversed, resulting in a
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* resource reservation conflict on the memory window that the efifb
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* framebuffer steals from the PCIe host bridge.
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*/
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static int efifb_add_links(const struct fwnode_handle *fwnode,
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struct device *dev)
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{
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struct device_node *sup_np;
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struct device *sup_dev;
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sup_np = find_pci_overlap_node();
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/*
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* If there's no PCI graphics controller backing the efifb, we are
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* done here.
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*/
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if (!sup_np)
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return 0;
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sup_dev = get_dev_from_fwnode(&sup_np->fwnode);
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of_node_put(sup_np);
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/*
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* Return -ENODEV if the PCI graphics controller device hasn't been
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* registered yet. This ensures that efifb isn't allowed to probe
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* and this function is retried again when new devices are
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* registered.
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*/
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if (!sup_dev)
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return -ENODEV;
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/*
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* If this fails, retrying this function at a later point won't
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* change anything. So, don't return an error after this.
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*/
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if (!device_link_add(dev, sup_dev, fw_devlink_get_flags()))
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dev_warn(dev, "device_link_add() failed\n");
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put_device(sup_dev);
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return 0;
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}
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static const struct fwnode_operations efifb_fwnode_ops = {
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.add_links = efifb_add_links,
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};
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static struct fwnode_handle efifb_fwnode = {
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.ops = &efifb_fwnode_ops,
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};
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static int __init register_gop_device(void)
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{
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struct platform_device *pd;
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int err;
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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_alloc("efi-framebuffer", 0);
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if (!pd)
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return -ENOMEM;
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if (IS_ENABLED(CONFIG_PCI))
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pd->dev.fwnode = &efifb_fwnode;
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err = platform_device_add_data(pd, &screen_info, sizeof(screen_info));
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if (err)
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return err;
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return platform_device_add(pd);
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}
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subsys_initcall(register_gop_device);
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