forked from Minki/linux
d9e9a64180
Kernel page table isolation requires to have two PGDs. One for the kernel, which contains the full kernel mapping plus the user space mapping and one for user space which contains the user space mappings and the minimal set of kernel mappings which are required by the architecture to be able to transition from and to user space. Add the necessary preliminaries. [ tglx: Split out from the big kaiser dump. EFI fixup from Kirill ] Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@suse.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: David Laight <David.Laight@aculab.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Eduardo Valentin <eduval@amazon.com> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will.deacon@arm.com> Cc: aliguori@amazon.com Cc: daniel.gruss@iaik.tugraz.at Cc: hughd@google.com Cc: keescook@google.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
895 lines
23 KiB
C
895 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* x86_64 specific EFI 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) 2005-2008 Intel Co.
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* Fenghua Yu <fenghua.yu@intel.com>
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* Bibo Mao <bibo.mao@intel.com>
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* Chandramouli Narayanan <mouli@linux.intel.com>
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* Huang Ying <ying.huang@intel.com>
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*
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* Code to convert EFI to E820 map has been implemented in elilo bootloader
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* based on a EFI patch by Edgar Hucek. Based on the E820 map, the page table
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* is setup appropriately for EFI runtime code.
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* - mouli 06/14/2007.
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*
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*/
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#define pr_fmt(fmt) "efi: " fmt
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/bootmem.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/mc146818rtc.h>
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#include <linux/efi.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/reboot.h>
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#include <linux/slab.h>
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#include <linux/ucs2_string.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/e820/api.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include <asm/proto.h>
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#include <asm/efi.h>
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#include <asm/cacheflush.h>
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#include <asm/fixmap.h>
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#include <asm/realmode.h>
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#include <asm/time.h>
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#include <asm/pgalloc.h>
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/*
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* We allocate runtime services regions top-down, starting from -4G, i.e.
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* 0xffff_ffff_0000_0000 and limit EFI VA mapping space to 64G.
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*/
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static u64 efi_va = EFI_VA_START;
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struct efi_scratch efi_scratch;
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static void __init early_code_mapping_set_exec(int executable)
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{
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efi_memory_desc_t *md;
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if (!(__supported_pte_mask & _PAGE_NX))
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return;
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/* Make EFI service code area executable */
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for_each_efi_memory_desc(md) {
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if (md->type == EFI_RUNTIME_SERVICES_CODE ||
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md->type == EFI_BOOT_SERVICES_CODE)
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efi_set_executable(md, executable);
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}
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}
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pgd_t * __init efi_call_phys_prolog(void)
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{
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unsigned long vaddr, addr_pgd, addr_p4d, addr_pud;
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pgd_t *save_pgd, *pgd_k, *pgd_efi;
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p4d_t *p4d, *p4d_k, *p4d_efi;
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pud_t *pud;
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int pgd;
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int n_pgds, i, j;
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if (!efi_enabled(EFI_OLD_MEMMAP)) {
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save_pgd = (pgd_t *)__read_cr3();
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write_cr3((unsigned long)efi_scratch.efi_pgt);
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goto out;
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}
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early_code_mapping_set_exec(1);
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n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE);
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save_pgd = kmalloc_array(n_pgds, sizeof(*save_pgd), GFP_KERNEL);
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/*
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* Build 1:1 identity mapping for efi=old_map usage. Note that
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* PAGE_OFFSET is PGDIR_SIZE aligned when KASLR is disabled, while
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* it is PUD_SIZE ALIGNED with KASLR enabled. So for a given physical
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* address X, the pud_index(X) != pud_index(__va(X)), we can only copy
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* PUD entry of __va(X) to fill in pud entry of X to build 1:1 mapping.
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* This means here we can only reuse the PMD tables of the direct mapping.
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*/
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for (pgd = 0; pgd < n_pgds; pgd++) {
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addr_pgd = (unsigned long)(pgd * PGDIR_SIZE);
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vaddr = (unsigned long)__va(pgd * PGDIR_SIZE);
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pgd_efi = pgd_offset_k(addr_pgd);
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save_pgd[pgd] = *pgd_efi;
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p4d = p4d_alloc(&init_mm, pgd_efi, addr_pgd);
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if (!p4d) {
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pr_err("Failed to allocate p4d table!\n");
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goto out;
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}
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for (i = 0; i < PTRS_PER_P4D; i++) {
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addr_p4d = addr_pgd + i * P4D_SIZE;
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p4d_efi = p4d + p4d_index(addr_p4d);
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pud = pud_alloc(&init_mm, p4d_efi, addr_p4d);
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if (!pud) {
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pr_err("Failed to allocate pud table!\n");
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goto out;
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}
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for (j = 0; j < PTRS_PER_PUD; j++) {
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addr_pud = addr_p4d + j * PUD_SIZE;
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if (addr_pud > (max_pfn << PAGE_SHIFT))
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break;
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vaddr = (unsigned long)__va(addr_pud);
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pgd_k = pgd_offset_k(vaddr);
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p4d_k = p4d_offset(pgd_k, vaddr);
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pud[j] = *pud_offset(p4d_k, vaddr);
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}
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}
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}
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out:
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__flush_tlb_all();
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return save_pgd;
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}
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void __init efi_call_phys_epilog(pgd_t *save_pgd)
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{
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/*
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* After the lock is released, the original page table is restored.
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*/
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int pgd_idx, i;
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int nr_pgds;
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pgd_t *pgd;
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p4d_t *p4d;
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pud_t *pud;
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if (!efi_enabled(EFI_OLD_MEMMAP)) {
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write_cr3((unsigned long)save_pgd);
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__flush_tlb_all();
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return;
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}
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nr_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE);
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for (pgd_idx = 0; pgd_idx < nr_pgds; pgd_idx++) {
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pgd = pgd_offset_k(pgd_idx * PGDIR_SIZE);
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set_pgd(pgd_offset_k(pgd_idx * PGDIR_SIZE), save_pgd[pgd_idx]);
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if (!(pgd_val(*pgd) & _PAGE_PRESENT))
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continue;
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for (i = 0; i < PTRS_PER_P4D; i++) {
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p4d = p4d_offset(pgd,
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pgd_idx * PGDIR_SIZE + i * P4D_SIZE);
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if (!(p4d_val(*p4d) & _PAGE_PRESENT))
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continue;
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pud = (pud_t *)p4d_page_vaddr(*p4d);
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pud_free(&init_mm, pud);
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}
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p4d = (p4d_t *)pgd_page_vaddr(*pgd);
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p4d_free(&init_mm, p4d);
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}
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kfree(save_pgd);
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__flush_tlb_all();
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early_code_mapping_set_exec(0);
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}
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static pgd_t *efi_pgd;
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/*
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* We need our own copy of the higher levels of the page tables
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* because we want to avoid inserting EFI region mappings (EFI_VA_END
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* to EFI_VA_START) into the standard kernel page tables. Everything
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* else can be shared, see efi_sync_low_kernel_mappings().
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*
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* We don't want the pgd on the pgd_list and cannot use pgd_alloc() for the
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* allocation.
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*/
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int __init efi_alloc_page_tables(void)
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{
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pgd_t *pgd;
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p4d_t *p4d;
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pud_t *pud;
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gfp_t gfp_mask;
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if (efi_enabled(EFI_OLD_MEMMAP))
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return 0;
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gfp_mask = GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO;
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efi_pgd = (pgd_t *)__get_free_pages(gfp_mask, PGD_ALLOCATION_ORDER);
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if (!efi_pgd)
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return -ENOMEM;
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pgd = efi_pgd + pgd_index(EFI_VA_END);
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p4d = p4d_alloc(&init_mm, pgd, EFI_VA_END);
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if (!p4d) {
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free_page((unsigned long)efi_pgd);
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return -ENOMEM;
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}
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pud = pud_alloc(&init_mm, p4d, EFI_VA_END);
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if (!pud) {
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if (CONFIG_PGTABLE_LEVELS > 4)
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free_page((unsigned long) pgd_page_vaddr(*pgd));
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free_page((unsigned long)efi_pgd);
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return -ENOMEM;
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}
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return 0;
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}
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/*
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* Add low kernel mappings for passing arguments to EFI functions.
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*/
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void efi_sync_low_kernel_mappings(void)
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{
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unsigned num_entries;
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pgd_t *pgd_k, *pgd_efi;
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p4d_t *p4d_k, *p4d_efi;
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pud_t *pud_k, *pud_efi;
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if (efi_enabled(EFI_OLD_MEMMAP))
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return;
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/*
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* We can share all PGD entries apart from the one entry that
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* covers the EFI runtime mapping space.
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*
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* Make sure the EFI runtime region mappings are guaranteed to
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* only span a single PGD entry and that the entry also maps
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* other important kernel regions.
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*/
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BUILD_BUG_ON(pgd_index(EFI_VA_END) != pgd_index(MODULES_END));
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BUILD_BUG_ON((EFI_VA_START & PGDIR_MASK) !=
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(EFI_VA_END & PGDIR_MASK));
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pgd_efi = efi_pgd + pgd_index(PAGE_OFFSET);
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pgd_k = pgd_offset_k(PAGE_OFFSET);
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num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET);
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memcpy(pgd_efi, pgd_k, sizeof(pgd_t) * num_entries);
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/*
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* As with PGDs, we share all P4D entries apart from the one entry
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* that covers the EFI runtime mapping space.
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*/
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BUILD_BUG_ON(p4d_index(EFI_VA_END) != p4d_index(MODULES_END));
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BUILD_BUG_ON((EFI_VA_START & P4D_MASK) != (EFI_VA_END & P4D_MASK));
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pgd_efi = efi_pgd + pgd_index(EFI_VA_END);
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pgd_k = pgd_offset_k(EFI_VA_END);
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p4d_efi = p4d_offset(pgd_efi, 0);
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p4d_k = p4d_offset(pgd_k, 0);
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num_entries = p4d_index(EFI_VA_END);
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memcpy(p4d_efi, p4d_k, sizeof(p4d_t) * num_entries);
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/*
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* We share all the PUD entries apart from those that map the
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* EFI regions. Copy around them.
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*/
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BUILD_BUG_ON((EFI_VA_START & ~PUD_MASK) != 0);
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BUILD_BUG_ON((EFI_VA_END & ~PUD_MASK) != 0);
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p4d_efi = p4d_offset(pgd_efi, EFI_VA_END);
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p4d_k = p4d_offset(pgd_k, EFI_VA_END);
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pud_efi = pud_offset(p4d_efi, 0);
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pud_k = pud_offset(p4d_k, 0);
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num_entries = pud_index(EFI_VA_END);
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memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
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pud_efi = pud_offset(p4d_efi, EFI_VA_START);
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pud_k = pud_offset(p4d_k, EFI_VA_START);
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num_entries = PTRS_PER_PUD - pud_index(EFI_VA_START);
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memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
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}
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/*
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* Wrapper for slow_virt_to_phys() that handles NULL addresses.
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*/
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static inline phys_addr_t
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virt_to_phys_or_null_size(void *va, unsigned long size)
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{
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bool bad_size;
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if (!va)
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return 0;
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if (virt_addr_valid(va))
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return virt_to_phys(va);
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/*
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* A fully aligned variable on the stack is guaranteed not to
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* cross a page bounary. Try to catch strings on the stack by
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* checking that 'size' is a power of two.
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*/
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bad_size = size > PAGE_SIZE || !is_power_of_2(size);
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WARN_ON(!IS_ALIGNED((unsigned long)va, size) || bad_size);
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return slow_virt_to_phys(va);
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}
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#define virt_to_phys_or_null(addr) \
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virt_to_phys_or_null_size((addr), sizeof(*(addr)))
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int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
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{
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unsigned long pfn, text, pf;
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struct page *page;
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unsigned npages;
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pgd_t *pgd;
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if (efi_enabled(EFI_OLD_MEMMAP))
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return 0;
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/*
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* Since the PGD is encrypted, set the encryption mask so that when
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* this value is loaded into cr3 the PGD will be decrypted during
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* the pagetable walk.
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*/
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efi_scratch.efi_pgt = (pgd_t *)__sme_pa(efi_pgd);
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pgd = efi_pgd;
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/*
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* It can happen that the physical address of new_memmap lands in memory
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* which is not mapped in the EFI page table. Therefore we need to go
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* and ident-map those pages containing the map before calling
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* phys_efi_set_virtual_address_map().
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*/
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pfn = pa_memmap >> PAGE_SHIFT;
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pf = _PAGE_NX | _PAGE_RW | _PAGE_ENC;
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if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, pf)) {
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pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap);
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return 1;
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}
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efi_scratch.use_pgd = true;
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/*
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* Certain firmware versions are way too sentimential and still believe
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* they are exclusive and unquestionable owners of the first physical page,
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* even though they explicitly mark it as EFI_CONVENTIONAL_MEMORY
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* (but then write-access it later during SetVirtualAddressMap()).
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*
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* Create a 1:1 mapping for this page, to avoid triple faults during early
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* boot with such firmware. We are free to hand this page to the BIOS,
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* as trim_bios_range() will reserve the first page and isolate it away
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* from memory allocators anyway.
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*/
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if (kernel_map_pages_in_pgd(pgd, 0x0, 0x0, 1, _PAGE_RW)) {
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pr_err("Failed to create 1:1 mapping for the first page!\n");
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return 1;
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}
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/*
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* When making calls to the firmware everything needs to be 1:1
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* mapped and addressable with 32-bit pointers. Map the kernel
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* text and allocate a new stack because we can't rely on the
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* stack pointer being < 4GB.
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*/
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if (!IS_ENABLED(CONFIG_EFI_MIXED) || efi_is_native())
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return 0;
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page = alloc_page(GFP_KERNEL|__GFP_DMA32);
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if (!page)
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panic("Unable to allocate EFI runtime stack < 4GB\n");
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efi_scratch.phys_stack = virt_to_phys(page_address(page));
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efi_scratch.phys_stack += PAGE_SIZE; /* stack grows down */
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npages = (_etext - _text) >> PAGE_SHIFT;
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text = __pa(_text);
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pfn = text >> PAGE_SHIFT;
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pf = _PAGE_RW | _PAGE_ENC;
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if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, pf)) {
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pr_err("Failed to map kernel text 1:1\n");
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return 1;
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}
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return 0;
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}
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static void __init __map_region(efi_memory_desc_t *md, u64 va)
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{
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unsigned long flags = _PAGE_RW;
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unsigned long pfn;
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pgd_t *pgd = efi_pgd;
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if (!(md->attribute & EFI_MEMORY_WB))
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flags |= _PAGE_PCD;
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pfn = md->phys_addr >> PAGE_SHIFT;
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if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags))
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pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
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md->phys_addr, va);
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}
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void __init efi_map_region(efi_memory_desc_t *md)
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{
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unsigned long size = md->num_pages << PAGE_SHIFT;
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u64 pa = md->phys_addr;
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if (efi_enabled(EFI_OLD_MEMMAP))
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return old_map_region(md);
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/*
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* Make sure the 1:1 mappings are present as a catch-all for b0rked
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* firmware which doesn't update all internal pointers after switching
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* to virtual mode and would otherwise crap on us.
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*/
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__map_region(md, md->phys_addr);
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/*
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* Enforce the 1:1 mapping as the default virtual address when
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* booting in EFI mixed mode, because even though we may be
|
|
* running a 64-bit kernel, the firmware may only be 32-bit.
|
|
*/
|
|
if (!efi_is_native () && IS_ENABLED(CONFIG_EFI_MIXED)) {
|
|
md->virt_addr = md->phys_addr;
|
|
return;
|
|
}
|
|
|
|
efi_va -= size;
|
|
|
|
/* Is PA 2M-aligned? */
|
|
if (!(pa & (PMD_SIZE - 1))) {
|
|
efi_va &= PMD_MASK;
|
|
} else {
|
|
u64 pa_offset = pa & (PMD_SIZE - 1);
|
|
u64 prev_va = efi_va;
|
|
|
|
/* get us the same offset within this 2M page */
|
|
efi_va = (efi_va & PMD_MASK) + pa_offset;
|
|
|
|
if (efi_va > prev_va)
|
|
efi_va -= PMD_SIZE;
|
|
}
|
|
|
|
if (efi_va < EFI_VA_END) {
|
|
pr_warn(FW_WARN "VA address range overflow!\n");
|
|
return;
|
|
}
|
|
|
|
/* Do the VA map */
|
|
__map_region(md, efi_va);
|
|
md->virt_addr = efi_va;
|
|
}
|
|
|
|
/*
|
|
* kexec kernel will use efi_map_region_fixed to map efi runtime memory ranges.
|
|
* md->virt_addr is the original virtual address which had been mapped in kexec
|
|
* 1st kernel.
|
|
*/
|
|
void __init efi_map_region_fixed(efi_memory_desc_t *md)
|
|
{
|
|
__map_region(md, md->phys_addr);
|
|
__map_region(md, md->virt_addr);
|
|
}
|
|
|
|
void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
|
|
u32 type, u64 attribute)
|
|
{
|
|
unsigned long last_map_pfn;
|
|
|
|
if (type == EFI_MEMORY_MAPPED_IO)
|
|
return ioremap(phys_addr, size);
|
|
|
|
last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size);
|
|
if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) {
|
|
unsigned long top = last_map_pfn << PAGE_SHIFT;
|
|
efi_ioremap(top, size - (top - phys_addr), type, attribute);
|
|
}
|
|
|
|
if (!(attribute & EFI_MEMORY_WB))
|
|
efi_memory_uc((u64)(unsigned long)__va(phys_addr), size);
|
|
|
|
return (void __iomem *)__va(phys_addr);
|
|
}
|
|
|
|
void __init parse_efi_setup(u64 phys_addr, u32 data_len)
|
|
{
|
|
efi_setup = phys_addr + sizeof(struct setup_data);
|
|
}
|
|
|
|
static int __init efi_update_mappings(efi_memory_desc_t *md, unsigned long pf)
|
|
{
|
|
unsigned long pfn;
|
|
pgd_t *pgd = efi_pgd;
|
|
int err1, err2;
|
|
|
|
/* Update the 1:1 mapping */
|
|
pfn = md->phys_addr >> PAGE_SHIFT;
|
|
err1 = kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, md->num_pages, pf);
|
|
if (err1) {
|
|
pr_err("Error while updating 1:1 mapping PA 0x%llx -> VA 0x%llx!\n",
|
|
md->phys_addr, md->virt_addr);
|
|
}
|
|
|
|
err2 = kernel_map_pages_in_pgd(pgd, pfn, md->virt_addr, md->num_pages, pf);
|
|
if (err2) {
|
|
pr_err("Error while updating VA mapping PA 0x%llx -> VA 0x%llx!\n",
|
|
md->phys_addr, md->virt_addr);
|
|
}
|
|
|
|
return err1 || err2;
|
|
}
|
|
|
|
static int __init efi_update_mem_attr(struct mm_struct *mm, efi_memory_desc_t *md)
|
|
{
|
|
unsigned long pf = 0;
|
|
|
|
if (md->attribute & EFI_MEMORY_XP)
|
|
pf |= _PAGE_NX;
|
|
|
|
if (!(md->attribute & EFI_MEMORY_RO))
|
|
pf |= _PAGE_RW;
|
|
|
|
return efi_update_mappings(md, pf);
|
|
}
|
|
|
|
void __init efi_runtime_update_mappings(void)
|
|
{
|
|
efi_memory_desc_t *md;
|
|
|
|
if (efi_enabled(EFI_OLD_MEMMAP)) {
|
|
if (__supported_pte_mask & _PAGE_NX)
|
|
runtime_code_page_mkexec();
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Use the EFI Memory Attribute Table for mapping permissions if it
|
|
* exists, since it is intended to supersede EFI_PROPERTIES_TABLE.
|
|
*/
|
|
if (efi_enabled(EFI_MEM_ATTR)) {
|
|
efi_memattr_apply_permissions(NULL, efi_update_mem_attr);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* EFI_MEMORY_ATTRIBUTES_TABLE is intended to replace
|
|
* EFI_PROPERTIES_TABLE. So, use EFI_PROPERTIES_TABLE to update
|
|
* permissions only if EFI_MEMORY_ATTRIBUTES_TABLE is not
|
|
* published by the firmware. Even if we find a buggy implementation of
|
|
* EFI_MEMORY_ATTRIBUTES_TABLE, don't fall back to
|
|
* EFI_PROPERTIES_TABLE, because of the same reason.
|
|
*/
|
|
|
|
if (!efi_enabled(EFI_NX_PE_DATA))
|
|
return;
|
|
|
|
for_each_efi_memory_desc(md) {
|
|
unsigned long pf = 0;
|
|
|
|
if (!(md->attribute & EFI_MEMORY_RUNTIME))
|
|
continue;
|
|
|
|
if (!(md->attribute & EFI_MEMORY_WB))
|
|
pf |= _PAGE_PCD;
|
|
|
|
if ((md->attribute & EFI_MEMORY_XP) ||
|
|
(md->type == EFI_RUNTIME_SERVICES_DATA))
|
|
pf |= _PAGE_NX;
|
|
|
|
if (!(md->attribute & EFI_MEMORY_RO) &&
|
|
(md->type != EFI_RUNTIME_SERVICES_CODE))
|
|
pf |= _PAGE_RW;
|
|
|
|
efi_update_mappings(md, pf);
|
|
}
|
|
}
|
|
|
|
void __init efi_dump_pagetable(void)
|
|
{
|
|
#ifdef CONFIG_EFI_PGT_DUMP
|
|
if (efi_enabled(EFI_OLD_MEMMAP))
|
|
ptdump_walk_pgd_level(NULL, swapper_pg_dir);
|
|
else
|
|
ptdump_walk_pgd_level(NULL, efi_pgd);
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_EFI_MIXED
|
|
extern efi_status_t efi64_thunk(u32, ...);
|
|
|
|
#define runtime_service32(func) \
|
|
({ \
|
|
u32 table = (u32)(unsigned long)efi.systab; \
|
|
u32 *rt, *___f; \
|
|
\
|
|
rt = (u32 *)(table + offsetof(efi_system_table_32_t, runtime)); \
|
|
___f = (u32 *)(*rt + offsetof(efi_runtime_services_32_t, func)); \
|
|
*___f; \
|
|
})
|
|
|
|
/*
|
|
* Switch to the EFI page tables early so that we can access the 1:1
|
|
* runtime services mappings which are not mapped in any other page
|
|
* tables. This function must be called before runtime_service32().
|
|
*
|
|
* Also, disable interrupts because the IDT points to 64-bit handlers,
|
|
* which aren't going to function correctly when we switch to 32-bit.
|
|
*/
|
|
#define efi_thunk(f, ...) \
|
|
({ \
|
|
efi_status_t __s; \
|
|
unsigned long __flags; \
|
|
u32 __func; \
|
|
\
|
|
local_irq_save(__flags); \
|
|
arch_efi_call_virt_setup(); \
|
|
\
|
|
__func = runtime_service32(f); \
|
|
__s = efi64_thunk(__func, __VA_ARGS__); \
|
|
\
|
|
arch_efi_call_virt_teardown(); \
|
|
local_irq_restore(__flags); \
|
|
\
|
|
__s; \
|
|
})
|
|
|
|
efi_status_t efi_thunk_set_virtual_address_map(
|
|
void *phys_set_virtual_address_map,
|
|
unsigned long memory_map_size,
|
|
unsigned long descriptor_size,
|
|
u32 descriptor_version,
|
|
efi_memory_desc_t *virtual_map)
|
|
{
|
|
efi_status_t status;
|
|
unsigned long flags;
|
|
u32 func;
|
|
|
|
efi_sync_low_kernel_mappings();
|
|
local_irq_save(flags);
|
|
|
|
efi_scratch.prev_cr3 = __read_cr3();
|
|
write_cr3((unsigned long)efi_scratch.efi_pgt);
|
|
__flush_tlb_all();
|
|
|
|
func = (u32)(unsigned long)phys_set_virtual_address_map;
|
|
status = efi64_thunk(func, memory_map_size, descriptor_size,
|
|
descriptor_version, virtual_map);
|
|
|
|
write_cr3(efi_scratch.prev_cr3);
|
|
__flush_tlb_all();
|
|
local_irq_restore(flags);
|
|
|
|
return status;
|
|
}
|
|
|
|
static efi_status_t efi_thunk_get_time(efi_time_t *tm, efi_time_cap_t *tc)
|
|
{
|
|
efi_status_t status;
|
|
u32 phys_tm, phys_tc;
|
|
|
|
spin_lock(&rtc_lock);
|
|
|
|
phys_tm = virt_to_phys_or_null(tm);
|
|
phys_tc = virt_to_phys_or_null(tc);
|
|
|
|
status = efi_thunk(get_time, phys_tm, phys_tc);
|
|
|
|
spin_unlock(&rtc_lock);
|
|
|
|
return status;
|
|
}
|
|
|
|
static efi_status_t efi_thunk_set_time(efi_time_t *tm)
|
|
{
|
|
efi_status_t status;
|
|
u32 phys_tm;
|
|
|
|
spin_lock(&rtc_lock);
|
|
|
|
phys_tm = virt_to_phys_or_null(tm);
|
|
|
|
status = efi_thunk(set_time, phys_tm);
|
|
|
|
spin_unlock(&rtc_lock);
|
|
|
|
return status;
|
|
}
|
|
|
|
static efi_status_t
|
|
efi_thunk_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending,
|
|
efi_time_t *tm)
|
|
{
|
|
efi_status_t status;
|
|
u32 phys_enabled, phys_pending, phys_tm;
|
|
|
|
spin_lock(&rtc_lock);
|
|
|
|
phys_enabled = virt_to_phys_or_null(enabled);
|
|
phys_pending = virt_to_phys_or_null(pending);
|
|
phys_tm = virt_to_phys_or_null(tm);
|
|
|
|
status = efi_thunk(get_wakeup_time, phys_enabled,
|
|
phys_pending, phys_tm);
|
|
|
|
spin_unlock(&rtc_lock);
|
|
|
|
return status;
|
|
}
|
|
|
|
static efi_status_t
|
|
efi_thunk_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
|
|
{
|
|
efi_status_t status;
|
|
u32 phys_tm;
|
|
|
|
spin_lock(&rtc_lock);
|
|
|
|
phys_tm = virt_to_phys_or_null(tm);
|
|
|
|
status = efi_thunk(set_wakeup_time, enabled, phys_tm);
|
|
|
|
spin_unlock(&rtc_lock);
|
|
|
|
return status;
|
|
}
|
|
|
|
static unsigned long efi_name_size(efi_char16_t *name)
|
|
{
|
|
return ucs2_strsize(name, EFI_VAR_NAME_LEN) + 1;
|
|
}
|
|
|
|
static efi_status_t
|
|
efi_thunk_get_variable(efi_char16_t *name, efi_guid_t *vendor,
|
|
u32 *attr, unsigned long *data_size, void *data)
|
|
{
|
|
efi_status_t status;
|
|
u32 phys_name, phys_vendor, phys_attr;
|
|
u32 phys_data_size, phys_data;
|
|
|
|
phys_data_size = virt_to_phys_or_null(data_size);
|
|
phys_vendor = virt_to_phys_or_null(vendor);
|
|
phys_name = virt_to_phys_or_null_size(name, efi_name_size(name));
|
|
phys_attr = virt_to_phys_or_null(attr);
|
|
phys_data = virt_to_phys_or_null_size(data, *data_size);
|
|
|
|
status = efi_thunk(get_variable, phys_name, phys_vendor,
|
|
phys_attr, phys_data_size, phys_data);
|
|
|
|
return status;
|
|
}
|
|
|
|
static efi_status_t
|
|
efi_thunk_set_variable(efi_char16_t *name, efi_guid_t *vendor,
|
|
u32 attr, unsigned long data_size, void *data)
|
|
{
|
|
u32 phys_name, phys_vendor, phys_data;
|
|
efi_status_t status;
|
|
|
|
phys_name = virt_to_phys_or_null_size(name, efi_name_size(name));
|
|
phys_vendor = virt_to_phys_or_null(vendor);
|
|
phys_data = virt_to_phys_or_null_size(data, data_size);
|
|
|
|
/* If data_size is > sizeof(u32) we've got problems */
|
|
status = efi_thunk(set_variable, phys_name, phys_vendor,
|
|
attr, data_size, phys_data);
|
|
|
|
return status;
|
|
}
|
|
|
|
static efi_status_t
|
|
efi_thunk_get_next_variable(unsigned long *name_size,
|
|
efi_char16_t *name,
|
|
efi_guid_t *vendor)
|
|
{
|
|
efi_status_t status;
|
|
u32 phys_name_size, phys_name, phys_vendor;
|
|
|
|
phys_name_size = virt_to_phys_or_null(name_size);
|
|
phys_vendor = virt_to_phys_or_null(vendor);
|
|
phys_name = virt_to_phys_or_null_size(name, *name_size);
|
|
|
|
status = efi_thunk(get_next_variable, phys_name_size,
|
|
phys_name, phys_vendor);
|
|
|
|
return status;
|
|
}
|
|
|
|
static efi_status_t
|
|
efi_thunk_get_next_high_mono_count(u32 *count)
|
|
{
|
|
efi_status_t status;
|
|
u32 phys_count;
|
|
|
|
phys_count = virt_to_phys_or_null(count);
|
|
status = efi_thunk(get_next_high_mono_count, phys_count);
|
|
|
|
return status;
|
|
}
|
|
|
|
static void
|
|
efi_thunk_reset_system(int reset_type, efi_status_t status,
|
|
unsigned long data_size, efi_char16_t *data)
|
|
{
|
|
u32 phys_data;
|
|
|
|
phys_data = virt_to_phys_or_null_size(data, data_size);
|
|
|
|
efi_thunk(reset_system, reset_type, status, data_size, phys_data);
|
|
}
|
|
|
|
static efi_status_t
|
|
efi_thunk_update_capsule(efi_capsule_header_t **capsules,
|
|
unsigned long count, unsigned long sg_list)
|
|
{
|
|
/*
|
|
* To properly support this function we would need to repackage
|
|
* 'capsules' because the firmware doesn't understand 64-bit
|
|
* pointers.
|
|
*/
|
|
return EFI_UNSUPPORTED;
|
|
}
|
|
|
|
static efi_status_t
|
|
efi_thunk_query_variable_info(u32 attr, u64 *storage_space,
|
|
u64 *remaining_space,
|
|
u64 *max_variable_size)
|
|
{
|
|
efi_status_t status;
|
|
u32 phys_storage, phys_remaining, phys_max;
|
|
|
|
if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
|
|
return EFI_UNSUPPORTED;
|
|
|
|
phys_storage = virt_to_phys_or_null(storage_space);
|
|
phys_remaining = virt_to_phys_or_null(remaining_space);
|
|
phys_max = virt_to_phys_or_null(max_variable_size);
|
|
|
|
status = efi_thunk(query_variable_info, attr, phys_storage,
|
|
phys_remaining, phys_max);
|
|
|
|
return status;
|
|
}
|
|
|
|
static efi_status_t
|
|
efi_thunk_query_capsule_caps(efi_capsule_header_t **capsules,
|
|
unsigned long count, u64 *max_size,
|
|
int *reset_type)
|
|
{
|
|
/*
|
|
* To properly support this function we would need to repackage
|
|
* 'capsules' because the firmware doesn't understand 64-bit
|
|
* pointers.
|
|
*/
|
|
return EFI_UNSUPPORTED;
|
|
}
|
|
|
|
void efi_thunk_runtime_setup(void)
|
|
{
|
|
efi.get_time = efi_thunk_get_time;
|
|
efi.set_time = efi_thunk_set_time;
|
|
efi.get_wakeup_time = efi_thunk_get_wakeup_time;
|
|
efi.set_wakeup_time = efi_thunk_set_wakeup_time;
|
|
efi.get_variable = efi_thunk_get_variable;
|
|
efi.get_next_variable = efi_thunk_get_next_variable;
|
|
efi.set_variable = efi_thunk_set_variable;
|
|
efi.get_next_high_mono_count = efi_thunk_get_next_high_mono_count;
|
|
efi.reset_system = efi_thunk_reset_system;
|
|
efi.query_variable_info = efi_thunk_query_variable_info;
|
|
efi.update_capsule = efi_thunk_update_capsule;
|
|
efi.query_capsule_caps = efi_thunk_query_capsule_caps;
|
|
}
|
|
#endif /* CONFIG_EFI_MIXED */
|