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/* * 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 / * 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. / #define FIXMAP_PMD_NUM 2 / fixmap starts downwards from the 507th entry in level2_fixmap_pgt / #define FIXMAP_PMD_TOP 507 #ifndef __ASSEMBLY__ #include <linux/kernel.h> #include <asm/acpi.h> #include <asm/apicdef.h> #include <asm/page.h> #ifdef CONFIG_X86_32 #include <linux/threads.h> #include <asm/kmap_types.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 ((unsigned long)__FIXADDR_TOP) #else #define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \ PAGE_SIZE) #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 { #ifdef CONFIG_X86_32 FIX_HOLE, #else #ifdef CONFIG_X86_VSYSCALL_EMULATION VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT, #endif #endif FIX_DBGP_BASE, FIX_EARLYCON_MEM_BASE, #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT FIX_OHCI1394_BASE, #endif #ifdef CONFIG_X86_LOCAL_APIC FIX_APIC_BASE, / local (CPU) APIC) -- required for SMP or not / #endif #ifdef CONFIG_X86_IO_APIC FIX_IO_APIC_BASE_0, FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, #endif #ifdef CONFIG_X86_32 FIX_KMAP_BEGIN, / reserved pte's for temporary kernel mappings / FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NRNR_CPUS)-1, #ifdef CONFIG_PCI_MMCONFIG FIX_PCIE_MCFG, #endif #endif #ifdef CONFIG_PARAVIRT FIX_PARAVIRT_BOOTMAP, #endif #ifdef CONFIG_X86_INTEL_MID FIX_LNW_VRTC, #endif #ifdef CONFIG_ACPI_APEI_GHES /* Used for GHES mapping from assorted contexts / FIX_APEI_GHES_IRQ, FIX_APEI_GHES_NMI, #endif __end_of_permanent_fixed_addresses, / * 512 temporary boot-time mappings, used by early_ioremap(), * before ioremap() is functional. * * If necessary we round it up to the next 512 pages boundary so * that we can have a single pmd entry and a single pte table: / #define NR_FIX_BTMAPS 64 #define FIX_BTMAPS_SLOTS 8 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS FIX_BTMAPS_SLOTS) FIX_BTMAP_END = (__end_of_permanent_fixed_addresses ^ (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) & -PTRS_PER_PTE ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1)) : __end_of_permanent_fixed_addresses, FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, #ifdef CONFIG_X86_32 FIX_WP_TEST, #endif #ifdef CONFIG_INTEL_TXT FIX_TBOOT_BASE, #endif __end_of_fixed_addresses }; extern void reserve_top_address(unsigned long reserve); #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) #define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) #define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE) extern int fixmaps_set; extern pte_t kmap_pte; #define kmap_prot PAGE_KERNEL 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 PAGE_KERNEL_IO_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) __set_fixmap(idx, phys, flags) #define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0)) 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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