/* * 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	2#else# define KM_PMDS	(KM_MAX_IDX * ((CONFIG_NR_CPUS + 511) / 512))# define FIXMAP_PMD_NUM (KM_PMDS + 2)#endif/* fixmap starts downwards from the 507th entry in level2_fixmap_pgt */#define FIXMAP_PMD_TOP	507 #ifndef __ASSEMBLER__#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	((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_KMAP_LOCAL	FIX_KMAP_BEGIN,	/* reserved pte's for temporary kernel mappings */	FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1,#ifdef CONFIG_PCI_MMCONFIG	FIX_PCIE_MCFG,#endif#endif#ifdef CONFIG_PARAVIRT_XXL	FIX_PARAVIRT_BOOTMAP,#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 *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_XXLstatic 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 /* !__ASSEMBLER__ */#endif /* _ASM_X86_FIXMAP_H */