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921 lines
22 KiB
921 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Common EFI (Extensible Firmware Interface) support functions |
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* Based on Extensible Firmware Interface Specification version 1.0 |
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* |
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* Copyright (C) 1999 VA Linux Systems |
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* Copyright (C) 1999 Walt Drummond <[email protected]> |
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* Copyright (C) 1999-2002 Hewlett-Packard Co. |
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* David Mosberger-Tang <[email protected]> |
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* Stephane Eranian <[email protected]> |
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* Copyright (C) 2005-2008 Intel Co. |
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* Fenghua Yu <[email protected]> |
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* Bibo Mao <[email protected]> |
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* Chandramouli Narayanan <[email protected]> |
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* Huang Ying <[email protected]> |
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* Copyright (C) 2013 SuSE Labs |
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* Borislav Petkov <[email protected]> - runtime services VA mapping |
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* |
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* Copied from efi_32.c to eliminate the duplicated code between EFI |
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* 32/64 support code. --ying 2007-10-26 |
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* |
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* All EFI Runtime Services are not implemented yet as EFI only |
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* supports physical mode addressing on SoftSDV. This is to be fixed |
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* in a future version. --drummond 1999-07-20 |
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* |
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* Implemented EFI runtime services and virtual mode calls. --davidm |
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* |
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* Goutham Rao: <[email protected]> |
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* Skip non-WB memory and ignore empty memory ranges. |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/efi.h> |
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#include <linux/efi-bgrt.h> |
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#include <linux/export.h> |
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#include <linux/memblock.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/uaccess.h> |
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#include <linux/time.h> |
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#include <linux/io.h> |
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#include <linux/reboot.h> |
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#include <linux/bcd.h> |
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|
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#include <asm/setup.h> |
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#include <asm/efi.h> |
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#include <asm/e820/api.h> |
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#include <asm/time.h> |
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#include <asm/tlbflush.h> |
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#include <asm/x86_init.h> |
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#include <asm/uv/uv.h> |
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|
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static unsigned long efi_systab_phys __initdata; |
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static unsigned long prop_phys = EFI_INVALID_TABLE_ADDR; |
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static unsigned long uga_phys = EFI_INVALID_TABLE_ADDR; |
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static unsigned long efi_runtime, efi_nr_tables; |
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|
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unsigned long efi_fw_vendor, efi_config_table; |
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|
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static const efi_config_table_type_t arch_tables[] __initconst = { |
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{EFI_PROPERTIES_TABLE_GUID, &prop_phys, "PROP" }, |
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{UGA_IO_PROTOCOL_GUID, &uga_phys, "UGA" }, |
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#ifdef CONFIG_X86_UV |
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{UV_SYSTEM_TABLE_GUID, &uv_systab_phys, "UVsystab" }, |
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#endif |
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{}, |
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}; |
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|
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static const unsigned long * const efi_tables[] = { |
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&efi.acpi, |
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&efi.acpi20, |
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&efi.smbios, |
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&efi.smbios3, |
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&uga_phys, |
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#ifdef CONFIG_X86_UV |
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&uv_systab_phys, |
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#endif |
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&efi_fw_vendor, |
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&efi_runtime, |
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&efi_config_table, |
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&efi.esrt, |
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&prop_phys, |
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&efi_mem_attr_table, |
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#ifdef CONFIG_EFI_RCI2_TABLE |
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&rci2_table_phys, |
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#endif |
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&efi.tpm_log, |
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&efi.tpm_final_log, |
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&efi_rng_seed, |
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#ifdef CONFIG_LOAD_UEFI_KEYS |
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&efi.mokvar_table, |
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#endif |
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}; |
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|
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u64 efi_setup; /* efi setup_data physical address */ |
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|
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static int add_efi_memmap __initdata; |
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static int __init setup_add_efi_memmap(char *arg) |
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{ |
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add_efi_memmap = 1; |
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return 0; |
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} |
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early_param("add_efi_memmap", setup_add_efi_memmap); |
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|
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void __init efi_find_mirror(void) |
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{ |
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efi_memory_desc_t *md; |
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u64 mirror_size = 0, total_size = 0; |
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|
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if (!efi_enabled(EFI_MEMMAP)) |
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return; |
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|
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for_each_efi_memory_desc(md) { |
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unsigned long long start = md->phys_addr; |
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unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; |
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|
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total_size += size; |
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if (md->attribute & EFI_MEMORY_MORE_RELIABLE) { |
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memblock_mark_mirror(start, size); |
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mirror_size += size; |
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} |
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} |
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if (mirror_size) |
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pr_info("Memory: %lldM/%lldM mirrored memory\n", |
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mirror_size>>20, total_size>>20); |
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} |
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|
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/* |
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* Tell the kernel about the EFI memory map. This might include |
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* more than the max 128 entries that can fit in the passed in e820 |
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* legacy (zeropage) memory map, but the kernel's e820 table can hold |
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* E820_MAX_ENTRIES. |
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*/ |
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|
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static void __init do_add_efi_memmap(void) |
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{ |
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efi_memory_desc_t *md; |
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|
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if (!efi_enabled(EFI_MEMMAP)) |
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return; |
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|
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for_each_efi_memory_desc(md) { |
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unsigned long long start = md->phys_addr; |
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unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; |
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int e820_type; |
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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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if (efi_soft_reserve_enabled() |
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&& (md->attribute & EFI_MEMORY_SP)) |
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e820_type = E820_TYPE_SOFT_RESERVED; |
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else if (md->attribute & EFI_MEMORY_WB) |
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e820_type = E820_TYPE_RAM; |
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else |
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e820_type = E820_TYPE_RESERVED; |
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break; |
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case EFI_ACPI_RECLAIM_MEMORY: |
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e820_type = E820_TYPE_ACPI; |
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break; |
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case EFI_ACPI_MEMORY_NVS: |
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e820_type = E820_TYPE_NVS; |
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break; |
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case EFI_UNUSABLE_MEMORY: |
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e820_type = E820_TYPE_UNUSABLE; |
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break; |
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case EFI_PERSISTENT_MEMORY: |
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e820_type = E820_TYPE_PMEM; |
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break; |
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default: |
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/* |
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* EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE |
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* EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO |
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* EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE |
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*/ |
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e820_type = E820_TYPE_RESERVED; |
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break; |
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} |
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|
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e820__range_add(start, size, e820_type); |
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} |
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e820__update_table(e820_table); |
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} |
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|
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/* |
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* Given add_efi_memmap defaults to 0 and there there is no alternative |
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* e820 mechanism for soft-reserved memory, import the full EFI memory |
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* map if soft reservations are present and enabled. Otherwise, the |
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* mechanism to disable the kernel's consideration of EFI_MEMORY_SP is |
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* the efi=nosoftreserve option. |
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*/ |
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static bool do_efi_soft_reserve(void) |
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{ |
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efi_memory_desc_t *md; |
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|
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if (!efi_enabled(EFI_MEMMAP)) |
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return false; |
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|
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if (!efi_soft_reserve_enabled()) |
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return false; |
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|
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for_each_efi_memory_desc(md) |
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if (md->type == EFI_CONVENTIONAL_MEMORY && |
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(md->attribute & EFI_MEMORY_SP)) |
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return true; |
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return false; |
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} |
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|
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int __init efi_memblock_x86_reserve_range(void) |
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{ |
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struct efi_info *e = &boot_params.efi_info; |
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struct efi_memory_map_data data; |
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phys_addr_t pmap; |
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int rv; |
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|
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if (efi_enabled(EFI_PARAVIRT)) |
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return 0; |
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|
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/* Can't handle firmware tables above 4GB on i386 */ |
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if (IS_ENABLED(CONFIG_X86_32) && e->efi_memmap_hi > 0) { |
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pr_err("Memory map is above 4GB, disabling EFI.\n"); |
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return -EINVAL; |
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} |
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pmap = (phys_addr_t)(e->efi_memmap | ((u64)e->efi_memmap_hi << 32)); |
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|
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data.phys_map = pmap; |
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data.size = e->efi_memmap_size; |
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data.desc_size = e->efi_memdesc_size; |
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data.desc_version = e->efi_memdesc_version; |
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|
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rv = efi_memmap_init_early(&data); |
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if (rv) |
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return rv; |
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|
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if (add_efi_memmap || do_efi_soft_reserve()) |
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do_add_efi_memmap(); |
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|
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efi_fake_memmap_early(); |
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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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|
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memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size); |
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set_bit(EFI_PRESERVE_BS_REGIONS, &efi.flags); |
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|
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return 0; |
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} |
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|
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#define OVERFLOW_ADDR_SHIFT (64 - EFI_PAGE_SHIFT) |
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#define OVERFLOW_ADDR_MASK (U64_MAX << OVERFLOW_ADDR_SHIFT) |
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#define U64_HIGH_BIT (~(U64_MAX >> 1)) |
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|
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static bool __init efi_memmap_entry_valid(const efi_memory_desc_t *md, int i) |
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{ |
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u64 end = (md->num_pages << EFI_PAGE_SHIFT) + md->phys_addr - 1; |
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u64 end_hi = 0; |
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char buf[64]; |
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|
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if (md->num_pages == 0) { |
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end = 0; |
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} else if (md->num_pages > EFI_PAGES_MAX || |
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EFI_PAGES_MAX - md->num_pages < |
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(md->phys_addr >> EFI_PAGE_SHIFT)) { |
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end_hi = (md->num_pages & OVERFLOW_ADDR_MASK) |
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>> OVERFLOW_ADDR_SHIFT; |
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|
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if ((md->phys_addr & U64_HIGH_BIT) && !(end & U64_HIGH_BIT)) |
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end_hi += 1; |
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} else { |
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return true; |
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} |
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pr_warn_once(FW_BUG "Invalid EFI memory map entries:\n"); |
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|
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if (end_hi) { |
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pr_warn("mem%02u: %s range=[0x%016llx-0x%llx%016llx] (invalid)\n", |
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i, efi_md_typeattr_format(buf, sizeof(buf), md), |
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md->phys_addr, end_hi, end); |
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} else { |
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pr_warn("mem%02u: %s range=[0x%016llx-0x%016llx] (invalid)\n", |
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i, efi_md_typeattr_format(buf, sizeof(buf), md), |
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md->phys_addr, end); |
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} |
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return false; |
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} |
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|
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static void __init efi_clean_memmap(void) |
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{ |
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efi_memory_desc_t *out = efi.memmap.map; |
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const efi_memory_desc_t *in = out; |
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const efi_memory_desc_t *end = efi.memmap.map_end; |
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int i, n_removal; |
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|
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for (i = n_removal = 0; in < end; i++) { |
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if (efi_memmap_entry_valid(in, i)) { |
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if (out != in) |
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memcpy(out, in, efi.memmap.desc_size); |
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out = (void *)out + efi.memmap.desc_size; |
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} else { |
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n_removal++; |
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} |
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in = (void *)in + efi.memmap.desc_size; |
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} |
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|
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if (n_removal > 0) { |
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struct efi_memory_map_data data = { |
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.phys_map = efi.memmap.phys_map, |
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.desc_version = efi.memmap.desc_version, |
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.desc_size = efi.memmap.desc_size, |
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.size = efi.memmap.desc_size * (efi.memmap.nr_map - n_removal), |
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.flags = 0, |
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}; |
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|
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pr_warn("Removing %d invalid memory map entries.\n", n_removal); |
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efi_memmap_install(&data); |
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} |
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} |
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|
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void __init efi_print_memmap(void) |
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{ |
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efi_memory_desc_t *md; |
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int i = 0; |
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|
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for_each_efi_memory_desc(md) { |
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char buf[64]; |
|
|
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pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n", |
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i++, efi_md_typeattr_format(buf, sizeof(buf), md), |
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md->phys_addr, |
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md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1, |
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(md->num_pages >> (20 - EFI_PAGE_SHIFT))); |
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} |
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} |
|
|
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static int __init efi_systab_init(unsigned long phys) |
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{ |
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int size = efi_enabled(EFI_64BIT) ? sizeof(efi_system_table_64_t) |
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: sizeof(efi_system_table_32_t); |
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const efi_table_hdr_t *hdr; |
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bool over4g = false; |
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void *p; |
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int ret; |
|
|
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hdr = p = early_memremap_ro(phys, size); |
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if (p == NULL) { |
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pr_err("Couldn't map the system table!\n"); |
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return -ENOMEM; |
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} |
|
|
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ret = efi_systab_check_header(hdr, 1); |
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if (ret) { |
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early_memunmap(p, size); |
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return ret; |
|
} |
|
|
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if (efi_enabled(EFI_64BIT)) { |
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const efi_system_table_64_t *systab64 = p; |
|
|
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efi_runtime = systab64->runtime; |
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over4g = systab64->runtime > U32_MAX; |
|
|
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if (efi_setup) { |
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struct efi_setup_data *data; |
|
|
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data = early_memremap_ro(efi_setup, sizeof(*data)); |
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if (!data) { |
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early_memunmap(p, size); |
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return -ENOMEM; |
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} |
|
|
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efi_fw_vendor = (unsigned long)data->fw_vendor; |
|
efi_config_table = (unsigned long)data->tables; |
|
|
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over4g |= data->fw_vendor > U32_MAX || |
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data->tables > U32_MAX; |
|
|
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early_memunmap(data, sizeof(*data)); |
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} else { |
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efi_fw_vendor = systab64->fw_vendor; |
|
efi_config_table = systab64->tables; |
|
|
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over4g |= systab64->fw_vendor > U32_MAX || |
|
systab64->tables > U32_MAX; |
|
} |
|
efi_nr_tables = systab64->nr_tables; |
|
} else { |
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const efi_system_table_32_t *systab32 = p; |
|
|
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efi_fw_vendor = systab32->fw_vendor; |
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efi_runtime = systab32->runtime; |
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efi_config_table = systab32->tables; |
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efi_nr_tables = systab32->nr_tables; |
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} |
|
|
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efi.runtime_version = hdr->revision; |
|
|
|
efi_systab_report_header(hdr, efi_fw_vendor); |
|
early_memunmap(p, size); |
|
|
|
if (IS_ENABLED(CONFIG_X86_32) && over4g) { |
|
pr_err("EFI data located above 4GB, disabling EFI.\n"); |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int __init efi_config_init(const efi_config_table_type_t *arch_tables) |
|
{ |
|
void *config_tables; |
|
int sz, ret; |
|
|
|
if (efi_nr_tables == 0) |
|
return 0; |
|
|
|
if (efi_enabled(EFI_64BIT)) |
|
sz = sizeof(efi_config_table_64_t); |
|
else |
|
sz = sizeof(efi_config_table_32_t); |
|
|
|
/* |
|
* Let's see what config tables the firmware passed to us. |
|
*/ |
|
config_tables = early_memremap(efi_config_table, efi_nr_tables * sz); |
|
if (config_tables == NULL) { |
|
pr_err("Could not map Configuration table!\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
ret = efi_config_parse_tables(config_tables, efi_nr_tables, |
|
arch_tables); |
|
|
|
early_memunmap(config_tables, efi_nr_tables * sz); |
|
return ret; |
|
} |
|
|
|
void __init efi_init(void) |
|
{ |
|
if (IS_ENABLED(CONFIG_X86_32) && |
|
(boot_params.efi_info.efi_systab_hi || |
|
boot_params.efi_info.efi_memmap_hi)) { |
|
pr_info("Table located above 4GB, disabling EFI.\n"); |
|
return; |
|
} |
|
|
|
efi_systab_phys = boot_params.efi_info.efi_systab | |
|
((__u64)boot_params.efi_info.efi_systab_hi << 32); |
|
|
|
if (efi_systab_init(efi_systab_phys)) |
|
return; |
|
|
|
if (efi_reuse_config(efi_config_table, efi_nr_tables)) |
|
return; |
|
|
|
if (efi_config_init(arch_tables)) |
|
return; |
|
|
|
/* |
|
* Note: We currently don't support runtime services on an EFI |
|
* that doesn't match the kernel 32/64-bit mode. |
|
*/ |
|
|
|
if (!efi_runtime_supported()) |
|
pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
|
|
|
if (!efi_runtime_supported() || efi_runtime_disabled()) { |
|
efi_memmap_unmap(); |
|
return; |
|
} |
|
|
|
/* Parse the EFI Properties table if it exists */ |
|
if (prop_phys != EFI_INVALID_TABLE_ADDR) { |
|
efi_properties_table_t *tbl; |
|
|
|
tbl = early_memremap_ro(prop_phys, sizeof(*tbl)); |
|
if (tbl == NULL) { |
|
pr_err("Could not map Properties table!\n"); |
|
} else { |
|
if (tbl->memory_protection_attribute & |
|
EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA) |
|
set_bit(EFI_NX_PE_DATA, &efi.flags); |
|
|
|
early_memunmap(tbl, sizeof(*tbl)); |
|
} |
|
} |
|
|
|
set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
|
efi_clean_memmap(); |
|
|
|
if (efi_enabled(EFI_DBG)) |
|
efi_print_memmap(); |
|
} |
|
|
|
/* Merge contiguous regions of the same type and attribute */ |
|
static void __init efi_merge_regions(void) |
|
{ |
|
efi_memory_desc_t *md, *prev_md = NULL; |
|
|
|
for_each_efi_memory_desc(md) { |
|
u64 prev_size; |
|
|
|
if (!prev_md) { |
|
prev_md = md; |
|
continue; |
|
} |
|
|
|
if (prev_md->type != md->type || |
|
prev_md->attribute != md->attribute) { |
|
prev_md = md; |
|
continue; |
|
} |
|
|
|
prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; |
|
|
|
if (md->phys_addr == (prev_md->phys_addr + prev_size)) { |
|
prev_md->num_pages += md->num_pages; |
|
md->type = EFI_RESERVED_TYPE; |
|
md->attribute = 0; |
|
continue; |
|
} |
|
prev_md = md; |
|
} |
|
} |
|
|
|
static void *realloc_pages(void *old_memmap, int old_shift) |
|
{ |
|
void *ret; |
|
|
|
ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1); |
|
if (!ret) |
|
goto out; |
|
|
|
/* |
|
* A first-time allocation doesn't have anything to copy. |
|
*/ |
|
if (!old_memmap) |
|
return ret; |
|
|
|
memcpy(ret, old_memmap, PAGE_SIZE << old_shift); |
|
|
|
out: |
|
free_pages((unsigned long)old_memmap, old_shift); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Iterate the EFI memory map in reverse order because the regions |
|
* will be mapped top-down. The end result is the same as if we had |
|
* mapped things forward, but doesn't require us to change the |
|
* existing implementation of efi_map_region(). |
|
*/ |
|
static inline void *efi_map_next_entry_reverse(void *entry) |
|
{ |
|
/* Initial call */ |
|
if (!entry) |
|
return efi.memmap.map_end - efi.memmap.desc_size; |
|
|
|
entry -= efi.memmap.desc_size; |
|
if (entry < efi.memmap.map) |
|
return NULL; |
|
|
|
return entry; |
|
} |
|
|
|
/* |
|
* efi_map_next_entry - Return the next EFI memory map descriptor |
|
* @entry: Previous EFI memory map descriptor |
|
* |
|
* This is a helper function to iterate over the EFI memory map, which |
|
* we do in different orders depending on the current configuration. |
|
* |
|
* To begin traversing the memory map @entry must be %NULL. |
|
* |
|
* Returns %NULL when we reach the end of the memory map. |
|
*/ |
|
static void *efi_map_next_entry(void *entry) |
|
{ |
|
if (efi_enabled(EFI_64BIT)) { |
|
/* |
|
* Starting in UEFI v2.5 the EFI_PROPERTIES_TABLE |
|
* config table feature requires us to map all entries |
|
* in the same order as they appear in the EFI memory |
|
* map. That is to say, entry N must have a lower |
|
* virtual address than entry N+1. This is because the |
|
* firmware toolchain leaves relative references in |
|
* the code/data sections, which are split and become |
|
* separate EFI memory regions. Mapping things |
|
* out-of-order leads to the firmware accessing |
|
* unmapped addresses. |
|
* |
|
* Since we need to map things this way whether or not |
|
* the kernel actually makes use of |
|
* EFI_PROPERTIES_TABLE, let's just switch to this |
|
* scheme by default for 64-bit. |
|
*/ |
|
return efi_map_next_entry_reverse(entry); |
|
} |
|
|
|
/* Initial call */ |
|
if (!entry) |
|
return efi.memmap.map; |
|
|
|
entry += efi.memmap.desc_size; |
|
if (entry >= efi.memmap.map_end) |
|
return NULL; |
|
|
|
return entry; |
|
} |
|
|
|
static bool should_map_region(efi_memory_desc_t *md) |
|
{ |
|
/* |
|
* Runtime regions always require runtime mappings (obviously). |
|
*/ |
|
if (md->attribute & EFI_MEMORY_RUNTIME) |
|
return true; |
|
|
|
/* |
|
* 32-bit EFI doesn't suffer from the bug that requires us to |
|
* reserve boot services regions, and mixed mode support |
|
* doesn't exist for 32-bit kernels. |
|
*/ |
|
if (IS_ENABLED(CONFIG_X86_32)) |
|
return false; |
|
|
|
/* |
|
* EFI specific purpose memory may be reserved by default |
|
* depending on kernel config and boot options. |
|
*/ |
|
if (md->type == EFI_CONVENTIONAL_MEMORY && |
|
efi_soft_reserve_enabled() && |
|
(md->attribute & EFI_MEMORY_SP)) |
|
return false; |
|
|
|
/* |
|
* Map all of RAM so that we can access arguments in the 1:1 |
|
* mapping when making EFI runtime calls. |
|
*/ |
|
if (efi_is_mixed()) { |
|
if (md->type == EFI_CONVENTIONAL_MEMORY || |
|
md->type == EFI_LOADER_DATA || |
|
md->type == EFI_LOADER_CODE) |
|
return true; |
|
} |
|
|
|
/* |
|
* Map boot services regions as a workaround for buggy |
|
* firmware that accesses them even when they shouldn't. |
|
* |
|
* See efi_{reserve,free}_boot_services(). |
|
*/ |
|
if (md->type == EFI_BOOT_SERVICES_CODE || |
|
md->type == EFI_BOOT_SERVICES_DATA) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
/* |
|
* Map the efi memory ranges of the runtime services and update new_mmap with |
|
* virtual addresses. |
|
*/ |
|
static void * __init efi_map_regions(int *count, int *pg_shift) |
|
{ |
|
void *p, *new_memmap = NULL; |
|
unsigned long left = 0; |
|
unsigned long desc_size; |
|
efi_memory_desc_t *md; |
|
|
|
desc_size = efi.memmap.desc_size; |
|
|
|
p = NULL; |
|
while ((p = efi_map_next_entry(p))) { |
|
md = p; |
|
|
|
if (!should_map_region(md)) |
|
continue; |
|
|
|
efi_map_region(md); |
|
|
|
if (left < desc_size) { |
|
new_memmap = realloc_pages(new_memmap, *pg_shift); |
|
if (!new_memmap) |
|
return NULL; |
|
|
|
left += PAGE_SIZE << *pg_shift; |
|
(*pg_shift)++; |
|
} |
|
|
|
memcpy(new_memmap + (*count * desc_size), md, desc_size); |
|
|
|
left -= desc_size; |
|
(*count)++; |
|
} |
|
|
|
return new_memmap; |
|
} |
|
|
|
static void __init kexec_enter_virtual_mode(void) |
|
{ |
|
#ifdef CONFIG_KEXEC_CORE |
|
efi_memory_desc_t *md; |
|
unsigned int num_pages; |
|
|
|
/* |
|
* We don't do virtual mode, since we don't do runtime services, on |
|
* non-native EFI. |
|
*/ |
|
if (efi_is_mixed()) { |
|
efi_memmap_unmap(); |
|
clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
|
return; |
|
} |
|
|
|
if (efi_alloc_page_tables()) { |
|
pr_err("Failed to allocate EFI page tables\n"); |
|
clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
|
return; |
|
} |
|
|
|
/* |
|
* Map efi regions which were passed via setup_data. The virt_addr is a |
|
* fixed addr which was used in first kernel of a kexec boot. |
|
*/ |
|
for_each_efi_memory_desc(md) |
|
efi_map_region_fixed(md); /* FIXME: add error handling */ |
|
|
|
/* |
|
* Unregister the early EFI memmap from efi_init() and install |
|
* the new EFI memory map. |
|
*/ |
|
efi_memmap_unmap(); |
|
|
|
if (efi_memmap_init_late(efi.memmap.phys_map, |
|
efi.memmap.desc_size * efi.memmap.nr_map)) { |
|
pr_err("Failed to remap late EFI memory map\n"); |
|
clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
|
return; |
|
} |
|
|
|
num_pages = ALIGN(efi.memmap.nr_map * efi.memmap.desc_size, PAGE_SIZE); |
|
num_pages >>= PAGE_SHIFT; |
|
|
|
if (efi_setup_page_tables(efi.memmap.phys_map, num_pages)) { |
|
clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
|
return; |
|
} |
|
|
|
efi_sync_low_kernel_mappings(); |
|
efi_native_runtime_setup(); |
|
#endif |
|
} |
|
|
|
/* |
|
* This function will switch the EFI runtime services to virtual mode. |
|
* Essentially, we look through the EFI memmap and map every region that |
|
* has the runtime attribute bit set in its memory descriptor into the |
|
* efi_pgd page table. |
|
* |
|
* The new method does a pagetable switch in a preemption-safe manner |
|
* so that we're in a different address space when calling a runtime |
|
* function. For function arguments passing we do copy the PUDs of the |
|
* kernel page table into efi_pgd prior to each call. |
|
* |
|
* Specially for kexec boot, efi runtime maps in previous kernel should |
|
* be passed in via setup_data. In that case runtime ranges will be mapped |
|
* to the same virtual addresses as the first kernel, see |
|
* kexec_enter_virtual_mode(). |
|
*/ |
|
static void __init __efi_enter_virtual_mode(void) |
|
{ |
|
int count = 0, pg_shift = 0; |
|
void *new_memmap = NULL; |
|
efi_status_t status; |
|
unsigned long pa; |
|
|
|
if (efi_alloc_page_tables()) { |
|
pr_err("Failed to allocate EFI page tables\n"); |
|
goto err; |
|
} |
|
|
|
efi_merge_regions(); |
|
new_memmap = efi_map_regions(&count, &pg_shift); |
|
if (!new_memmap) { |
|
pr_err("Error reallocating memory, EFI runtime non-functional!\n"); |
|
goto err; |
|
} |
|
|
|
pa = __pa(new_memmap); |
|
|
|
/* |
|
* Unregister the early EFI memmap from efi_init() and install |
|
* the new EFI memory map that we are about to pass to the |
|
* firmware via SetVirtualAddressMap(). |
|
*/ |
|
efi_memmap_unmap(); |
|
|
|
if (efi_memmap_init_late(pa, efi.memmap.desc_size * count)) { |
|
pr_err("Failed to remap late EFI memory map\n"); |
|
goto err; |
|
} |
|
|
|
if (efi_enabled(EFI_DBG)) { |
|
pr_info("EFI runtime memory map:\n"); |
|
efi_print_memmap(); |
|
} |
|
|
|
if (efi_setup_page_tables(pa, 1 << pg_shift)) |
|
goto err; |
|
|
|
efi_sync_low_kernel_mappings(); |
|
|
|
status = efi_set_virtual_address_map(efi.memmap.desc_size * count, |
|
efi.memmap.desc_size, |
|
efi.memmap.desc_version, |
|
(efi_memory_desc_t *)pa, |
|
efi_systab_phys); |
|
if (status != EFI_SUCCESS) { |
|
pr_err("Unable to switch EFI into virtual mode (status=%lx)!\n", |
|
status); |
|
goto err; |
|
} |
|
|
|
efi_check_for_embedded_firmwares(); |
|
efi_free_boot_services(); |
|
|
|
if (!efi_is_mixed()) |
|
efi_native_runtime_setup(); |
|
else |
|
efi_thunk_runtime_setup(); |
|
|
|
/* |
|
* Apply more restrictive page table mapping attributes now that |
|
* SVAM() has been called and the firmware has performed all |
|
* necessary relocation fixups for the new virtual addresses. |
|
*/ |
|
efi_runtime_update_mappings(); |
|
|
|
/* clean DUMMY object */ |
|
efi_delete_dummy_variable(); |
|
return; |
|
|
|
err: |
|
clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
|
} |
|
|
|
void __init efi_enter_virtual_mode(void) |
|
{ |
|
if (efi_enabled(EFI_PARAVIRT)) |
|
return; |
|
|
|
efi.runtime = (efi_runtime_services_t *)efi_runtime; |
|
|
|
if (efi_setup) |
|
kexec_enter_virtual_mode(); |
|
else |
|
__efi_enter_virtual_mode(); |
|
|
|
efi_dump_pagetable(); |
|
} |
|
|
|
bool efi_is_table_address(unsigned long phys_addr) |
|
{ |
|
unsigned int i; |
|
|
|
if (phys_addr == EFI_INVALID_TABLE_ADDR) |
|
return false; |
|
|
|
for (i = 0; i < ARRAY_SIZE(efi_tables); i++) |
|
if (*(efi_tables[i]) == phys_addr) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
char *efi_systab_show_arch(char *str) |
|
{ |
|
if (uga_phys != EFI_INVALID_TABLE_ADDR) |
|
str += sprintf(str, "UGA=0x%lx\n", uga_phys); |
|
return str; |
|
} |
|
|
|
#define EFI_FIELD(var) efi_ ## var |
|
|
|
#define EFI_ATTR_SHOW(name) \ |
|
static ssize_t name##_show(struct kobject *kobj, \ |
|
struct kobj_attribute *attr, char *buf) \ |
|
{ \ |
|
return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \ |
|
} |
|
|
|
EFI_ATTR_SHOW(fw_vendor); |
|
EFI_ATTR_SHOW(runtime); |
|
EFI_ATTR_SHOW(config_table); |
|
|
|
struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor); |
|
struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime); |
|
struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table); |
|
|
|
umode_t efi_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n) |
|
{ |
|
if (attr == &efi_attr_fw_vendor.attr) { |
|
if (efi_enabled(EFI_PARAVIRT) || |
|
efi_fw_vendor == EFI_INVALID_TABLE_ADDR) |
|
return 0; |
|
} else if (attr == &efi_attr_runtime.attr) { |
|
if (efi_runtime == EFI_INVALID_TABLE_ADDR) |
|
return 0; |
|
} else if (attr == &efi_attr_config_table.attr) { |
|
if (efi_config_table == EFI_INVALID_TABLE_ADDR) |
|
return 0; |
|
} |
|
return attr->mode; |
|
}
|
|
|