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142 lines
3.6 KiB
142 lines
3.6 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 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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* |
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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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#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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