/* * Extensible Firmware Interface * * Based on Extensible Firmware Interface Specification version 1.0 * * Copyright (C) 1999 VA Linux Systems * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> * Copyright (C) 1999-2002 Hewlett-Packard Co. * David Mosberger-Tang <davidm@hpl.hp.com> * Stephane Eranian <eranian@hpl.hp.com> * * All EFI Runtime Services are not implemented yet as EFI only * supports physical mode addressing on SoftSDV. This is to be fixed * in a future version. --drummond 1999-07-20 * * Implemented EFI runtime services and virtual mode calls. --davidm * * Goutham Rao: <goutham.rao@intel.com> * Skip non-WB memory and ignore empty memory ranges. */ #include <linux/kernel.h> #include <linux/types.h> #include <linux/ioport.h> #include <linux/efi.h> #include <asm/io.h> #include <asm/desc.h> #include <asm/page.h> #include <asm/pgtable.h> #include <asm/tlbflush.h> #include <asm/efi.h> /* * To make EFI call EFI runtime service in physical addressing mode we need * prolog/epilog before/after the invocation to disable interrupt, to * claim EFI runtime service handler exclusively and to duplicate a memory in * low memory space say 0 - 3G. */ static unsigned long efi_rt_eflags; void efi_sync_low_kernel_mappings(void) {} void __init efi_dump_pagetable(void) {} int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages) { return 0; } void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages) { } void __init efi_map_region(efi_memory_desc_t *md) { old_map_region(md); } void __init efi_map_region_fixed(efi_memory_desc_t *md) {} void __init parse_efi_setup(u64 phys_addr, u32 data_len) {} void __init efi_call_phys_prolog(void) { struct desc_ptr gdt_descr; local_irq_save(efi_rt_eflags); load_cr3(initial_page_table); __flush_tlb_all(); gdt_descr.address = __pa(get_cpu_gdt_table(0)); gdt_descr.size = GDT_SIZE - 1; load_gdt(&gdt_descr); } void __init efi_call_phys_epilog(void) { struct desc_ptr gdt_descr; gdt_descr.address = (unsigned long)get_cpu_gdt_table(0); gdt_descr.size = GDT_SIZE - 1; load_gdt(&gdt_descr); load_cr3(swapper_pg_dir); __flush_tlb_all(); local_irq_restore(efi_rt_eflags); } void __init efi_runtime_mkexec(void) { if (__supported_pte_mask & _PAGE_NX) runtime_code_page_mkexec(); }