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d92fc69cca
kernel_unmap_pages_in_pgd() is dangerous: if a PGD entry in init_mm.pgd were to be cleared, callers would need to ensure that the pgd entry hadn't been propagated to any other pgd. Its only caller was efi_cleanup_page_tables(), and that, in turn, was unused, so just delete both functions. This leaves a couple of other helpers unused, so delete them, too. Signed-off-by: Andy Lutomirski <luto@kernel.org> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Acked-by: Borislav Petkov <bp@suse.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/77ff20fdde3b75cd393be5559ad8218870520248.1468527351.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/*
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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 <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/pgtable.h>
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#include <asm/tlbflush.h>
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#include <asm/efi.h>
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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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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(efi_memory_desc_t *md)
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{
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old_map_region(md);
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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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pgd_t * __init efi_call_phys_prolog(void)
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{
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struct desc_ptr gdt_descr;
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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 = __pa(get_cpu_gdt_table(0));
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gdt_descr.size = GDT_SIZE - 1;
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load_gdt(&gdt_descr);
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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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struct desc_ptr gdt_descr;
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gdt_descr.address = (unsigned long)get_cpu_gdt_table(0);
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gdt_descr.size = GDT_SIZE - 1;
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load_gdt(&gdt_descr);
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load_cr3(save_pgd);
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__flush_tlb_all();
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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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runtime_code_page_mkexec();
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}
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