/* * fixmap.h: compile-time virtual memory allocation * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1998 Ingo Molnar * * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 * x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009 */ #ifndef _ASM_X86_FIXMAP_H #define _ASM_X86_FIXMAP_H #include <asm/kmap_size.h> /* * Exposed to assembly code for setting up initial page tables. Cannot be * calculated in assembly code (fixmap entries are an enum), but is sanity * checked in the actual fixmap C code to make sure that the fixmap is * covered fully. */ #ifndef CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP #define FIXMAP_PMD_NUM … #else #define KM_PMDS … #define FIXMAP_PMD_NUM … #endif /* fixmap starts downwards from the 507th entry in level2_fixmap_pgt */ #define FIXMAP_PMD_TOP … #ifndef __ASSEMBLY__ #include <linux/kernel.h> #include <asm/apicdef.h> #include <asm/page.h> #include <asm/pgtable_types.h> #ifdef CONFIG_X86_32 #include <linux/threads.h> #else #include <uapi/asm/vsyscall.h> #endif /* * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall * uses fixmaps that relies on FIXADDR_TOP for proper address calculation. * Because of this, FIXADDR_TOP x86 integration was left as later work. */ #ifdef CONFIG_X86_32 /* * Leave one empty page between vmalloc'ed areas and * the start of the fixmap. */ extern unsigned long __FIXADDR_TOP; #define FIXADDR_TOP … #else #define FIXADDR_TOP … #endif /* * Here we define all the compile-time 'special' virtual * addresses. The point is to have a constant address at * compile time, but to set the physical address only * in the boot process. * for x86_32: We allocate these special addresses * from the end of virtual memory (0xfffff000) backwards. * Also this lets us do fail-safe vmalloc(), we * can guarantee that these special addresses and * vmalloc()-ed addresses never overlap. * * These 'compile-time allocated' memory buffers are * fixed-size 4k pages (or larger if used with an increment * higher than 1). Use set_fixmap(idx,phys) to associate * physical memory with fixmap indices. * * TLB entries of such buffers will not be flushed across * task switches. */ enum fixed_addresses { … }; extern void reserve_top_address(unsigned long reserve); #define FIXADDR_SIZE … #define FIXADDR_START … #define FIXADDR_TOT_SIZE … #define FIXADDR_TOT_START … extern int fixmaps_set; extern pte_t *pkmap_page_table; void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); void native_set_fixmap(unsigned /* enum fixed_addresses */ idx, phys_addr_t phys, pgprot_t flags); #ifndef CONFIG_PARAVIRT_XXL static inline void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags) { native_set_fixmap(idx, phys, flags); } #endif /* * FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not * supported for MMIO addresses, so make sure that the memory encryption * mask is not part of the page attributes. */ #define FIXMAP_PAGE_NOCACHE … /* * Early memremap routines used for in-place encryption. The mappings created * by these routines are intended to be used as temporary mappings. */ void __init *early_memremap_encrypted(resource_size_t phys_addr, unsigned long size); void __init *early_memremap_encrypted_wp(resource_size_t phys_addr, unsigned long size); void __init *early_memremap_decrypted(resource_size_t phys_addr, unsigned long size); void __init *early_memremap_decrypted_wp(resource_size_t phys_addr, unsigned long size); #include <asm-generic/fixmap.h> #define __late_set_fixmap(idx, phys, flags) … #define __late_clear_fixmap(idx) … void __early_set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags); #endif /* !__ASSEMBLY__ */ #endif /* _ASM_X86_FIXMAP_H */
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