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/* * x86_64 specific EFI support functions * Based on Extensible Firmware Interface Specification version 1.0 * * Copyright (C) 2005-2008 Intel Co. * Fenghua Yu <fenghua.yu@intel.com> * Bibo Mao <bibo.mao@intel.com> * Chandramouli Narayanan <mouli@linux.intel.com> * Huang Ying <ying.huang@intel.com> * * Code to convert EFI to E820 map has been implemented in elilo bootloader * based on a EFI patch by Edgar Hucek. Based on the E820 map, the page table * is setup appropriately for EFI runtime code. * - mouli 06/14/2007. * */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/mm.h> #include <linux/types.h> #include <linux/spinlock.h> #include <linux/bootmem.h> #include <linux/ioport.h> #include <linux/module.h> #include <linux/efi.h> #include <linux/uaccess.h> #include <linux/io.h> #include <linux/reboot.h> #include <asm/setup.h> #include <asm/page.h> #include <asm/e820.h> #include <asm/pgtable.h> #include <asm/tlbflush.h> #include <asm/proto.h> #include <asm/efi.h> #include <asm/cacheflush.h> #include <asm/fixmap.h> static pgd_t save_pgd __initdata; static unsigned long efi_flags __initdata; static void __init early_code_mapping_set_exec(int executable) { efi_memory_desc_t *md; void *p; if (!(__supported_pte_mask & _PAGE_NX)) return; /* Make EFI service code area executable */ for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { md = p; if (md->type == EFI_RUNTIME_SERVICES_CODE || md->type == EFI_BOOT_SERVICES_CODE) efi_set_executable(md, executable); } } void __init efi_call_phys_prelog(void) { unsigned long vaddress; early_code_mapping_set_exec(1); local_irq_save(efi_flags); vaddress = (unsigned long)__va(0x0UL); save_pgd = *pgd_offset_k(0x0UL); set_pgd(pgd_offset_k(0x0UL), *pgd_offset_k(vaddress)); __flush_tlb_all(); } void __init efi_call_phys_epilog(void) { /* * After the lock is released, the original page table is restored. */ set_pgd(pgd_offset_k(0x0UL), save_pgd); __flush_tlb_all(); local_irq_restore(efi_flags); early_code_mapping_set_exec(0); } 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); } |