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178 lines
3.8 KiB
178 lines
3.8 KiB
// 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, 2014 Linaro Ltd. |
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*/ |
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#include <linux/dmi.h> |
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#include <linux/efi.h> |
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#include <linux/io.h> |
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#include <linux/memblock.h> |
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#include <linux/mm_types.h> |
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#include <linux/preempt.h> |
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#include <linux/rbtree.h> |
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#include <linux/rwsem.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/pgtable.h> |
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#include <asm/cacheflush.h> |
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#include <asm/efi.h> |
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#include <asm/mmu.h> |
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#include <asm/pgalloc.h> |
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#if defined(CONFIG_PTDUMP_DEBUGFS) && defined(CONFIG_ARM64) |
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#include <asm/ptdump.h> |
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static struct ptdump_info efi_ptdump_info = { |
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.mm = &efi_mm, |
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.markers = (struct addr_marker[]){ |
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{ 0, "UEFI runtime start" }, |
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{ DEFAULT_MAP_WINDOW_64, "UEFI runtime end" }, |
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{ -1, NULL } |
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}, |
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.base_addr = 0, |
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}; |
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static int __init ptdump_init(void) |
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{ |
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if (efi_enabled(EFI_RUNTIME_SERVICES)) |
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ptdump_debugfs_register(&efi_ptdump_info, "efi_page_tables"); |
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return 0; |
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} |
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device_initcall(ptdump_init); |
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#endif |
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static bool __init efi_virtmap_init(void) |
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{ |
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efi_memory_desc_t *md; |
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efi_mm.pgd = pgd_alloc(&efi_mm); |
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mm_init_cpumask(&efi_mm); |
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init_new_context(NULL, &efi_mm); |
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for_each_efi_memory_desc(md) { |
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phys_addr_t phys = md->phys_addr; |
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int ret; |
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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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return false; |
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ret = efi_create_mapping(&efi_mm, md); |
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if (ret) { |
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pr_warn(" EFI remap %pa: failed to create mapping (%d)\n", |
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&phys, ret); |
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return false; |
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} |
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} |
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if (efi_memattr_apply_permissions(&efi_mm, efi_set_mapping_permissions)) |
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return false; |
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return true; |
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} |
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/* |
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* Enable the UEFI Runtime Services if all prerequisites are in place, i.e., |
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* non-early mapping of the UEFI system table and virtual mappings for all |
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* EFI_MEMORY_RUNTIME regions. |
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*/ |
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static int __init arm_enable_runtime_services(void) |
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{ |
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u64 mapsize; |
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if (!efi_enabled(EFI_BOOT)) { |
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pr_info("EFI services will not be available.\n"); |
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return 0; |
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} |
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efi_memmap_unmap(); |
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mapsize = efi.memmap.desc_size * efi.memmap.nr_map; |
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if (efi_memmap_init_late(efi.memmap.phys_map, mapsize)) { |
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pr_err("Failed to remap EFI memory map\n"); |
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return 0; |
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} |
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if (efi_soft_reserve_enabled()) { |
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efi_memory_desc_t *md; |
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for_each_efi_memory_desc(md) { |
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int md_size = md->num_pages << EFI_PAGE_SHIFT; |
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struct resource *res; |
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if (!(md->attribute & EFI_MEMORY_SP)) |
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continue; |
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res = kzalloc(sizeof(*res), GFP_KERNEL); |
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if (WARN_ON(!res)) |
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break; |
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res->start = md->phys_addr; |
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res->end = md->phys_addr + md_size - 1; |
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res->name = "Soft Reserved"; |
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res->flags = IORESOURCE_MEM; |
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res->desc = IORES_DESC_SOFT_RESERVED; |
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insert_resource(&iomem_resource, res); |
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} |
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} |
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if (efi_runtime_disabled()) { |
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pr_info("EFI runtime services will be disabled.\n"); |
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return 0; |
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} |
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if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
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pr_info("EFI runtime services access via paravirt.\n"); |
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return 0; |
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} |
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pr_info("Remapping and enabling EFI services.\n"); |
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if (!efi_virtmap_init()) { |
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pr_err("UEFI virtual mapping missing or invalid -- runtime services will not be available\n"); |
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return -ENOMEM; |
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} |
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/* Set up runtime services function pointers */ |
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efi_native_runtime_setup(); |
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set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
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return 0; |
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} |
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early_initcall(arm_enable_runtime_services); |
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void efi_virtmap_load(void) |
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{ |
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preempt_disable(); |
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efi_set_pgd(&efi_mm); |
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} |
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void efi_virtmap_unload(void) |
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{ |
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efi_set_pgd(current->active_mm); |
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preempt_enable(); |
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} |
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static int __init arm_dmi_init(void) |
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{ |
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/* |
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* On arm64/ARM, DMI depends on UEFI, and dmi_setup() needs to |
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* be called early because dmi_id_init(), which is an arch_initcall |
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* itself, depends on dmi_scan_machine() having been called already. |
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*/ |
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dmi_setup(); |
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return 0; |
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} |
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core_initcall(arm_dmi_init);
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