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226 lines
5.6 KiB
226 lines
5.6 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 - 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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extern __weak const efi_config_table_type_t efi_arch_tables[]; |
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static void __init init_screen_info(void) |
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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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efi_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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/* |
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* For memblock manipulation, the cap should come after the memblock_add(). |
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* And now, memblock is fully populated, it is time to do capping. |
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*/ |
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early_init_dt_check_for_usable_mem_range(); |
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efi_find_mirror(); |
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efi_esrt_init(); |
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efi_mokvar_table_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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}
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