155 lines
3.8 KiB
C
155 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Extensible Firmware Interface
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*
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* Based on Extensible Firmware Interface Specification version 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 <drummond@valinux.com>
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* Copyright (C) 1999-2002 Hewlett-Packard Co.
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* David Mosberger-Tang <davidm@hpl.hp.com>
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* Stephane Eranian <eranian@hpl.hp.com>
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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: <goutham.rao@intel.com>
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* Skip non-WB memory and ignore empty memory ranges.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/ioport.h>
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#include <linux/efi.h>
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#include <linux/pgtable.h>
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#include <asm/io.h>
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#include <asm/desc.h>
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#include <asm/page.h>
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#include <asm/set_memory.h>
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#include <asm/tlbflush.h>
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#include <asm/efi.h>
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void __init efi_map_region(efi_memory_desc_t *md)
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{
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u64 start_pfn, end_pfn, end;
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unsigned long size;
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void *va;
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start_pfn = PFN_DOWN(md->phys_addr);
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size = md->num_pages << PAGE_SHIFT;
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end = md->phys_addr + size;
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end_pfn = PFN_UP(end);
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if (pfn_range_is_mapped(start_pfn, end_pfn)) {
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va = __va(md->phys_addr);
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if (!(md->attribute & EFI_MEMORY_WB))
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set_memory_uc((unsigned long)va, md->num_pages);
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} else {
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va = ioremap_cache(md->phys_addr, size);
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}
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md->virt_addr = (unsigned long)va;
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if (!va)
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pr_err("ioremap of 0x%llX failed!\n", md->phys_addr);
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}
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/*
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* To make EFI call EFI runtime service in physical addressing mode we need
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* prolog/epilog before/after the invocation to claim the EFI runtime service
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* handler exclusively and to duplicate a memory mapping in low memory space,
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* say 0 - 3G.
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*/
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int __init efi_alloc_page_tables(void)
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{
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return 0;
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}
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void efi_sync_low_kernel_mappings(void) {}
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void __init efi_dump_pagetable(void)
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{
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#ifdef CONFIG_EFI_PGT_DUMP
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ptdump_walk_pgd_level(NULL, &init_mm);
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#endif
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}
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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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return 0;
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}
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void __init efi_map_region_fixed(efi_memory_desc_t *md) {}
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void __init parse_efi_setup(u64 phys_addr, u32 data_len) {}
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efi_status_t efi_call_svam(efi_runtime_services_t * const *,
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u32, u32, u32, void *, u32);
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efi_status_t __init efi_set_virtual_address_map(unsigned long memory_map_size,
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unsigned long descriptor_size,
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u32 descriptor_version,
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efi_memory_desc_t *virtual_map,
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unsigned long systab_phys)
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{
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const efi_system_table_t *systab = (efi_system_table_t *)systab_phys;
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struct desc_ptr gdt_descr;
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efi_status_t status;
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unsigned long flags;
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pgd_t *save_pgd;
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/* Current pgd is swapper_pg_dir, we'll restore it later: */
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save_pgd = swapper_pg_dir;
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load_cr3(initial_page_table);
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__flush_tlb_all();
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gdt_descr.address = get_cpu_gdt_paddr(0);
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gdt_descr.size = GDT_SIZE - 1;
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load_gdt(&gdt_descr);
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/* Disable interrupts around EFI calls: */
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local_irq_save(flags);
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status = efi_call_svam(&systab->runtime,
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memory_map_size, descriptor_size,
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descriptor_version, virtual_map,
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__pa(&efi.runtime));
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local_irq_restore(flags);
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load_fixmap_gdt(0);
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load_cr3(save_pgd);
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__flush_tlb_all();
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return status;
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}
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void __init efi_runtime_update_mappings(void)
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{
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if (__supported_pte_mask & _PAGE_NX) {
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efi_memory_desc_t *md;
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/* Make EFI runtime 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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continue;
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set_memory_x(md->virt_addr, md->num_pages);
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}
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}
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}
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void arch_efi_call_virt_setup(void)
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{
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efi_fpu_begin();
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firmware_restrict_branch_speculation_start();
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}
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void arch_efi_call_virt_teardown(void)
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{
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firmware_restrict_branch_speculation_end();
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efi_fpu_end();
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}
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