/* * 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 * Copyright (C) 2013 Mark Salter <msalter@redhat.com> * * Adapted from arch/x86 version. * */ #ifndef _ASM_ARM64_FIXMAP_H#define _ASM_ARM64_FIXMAP_H #ifndef __ASSEMBLER__#include <linux/kernel.h>#include <linux/math.h>#include <linux/sizes.h>#include <asm/boot.h>#include <asm/page.h>#include <asm/pgtable-prot.h> /* * 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. * * Each enum increment in these 'compile-time allocated' * memory buffers is page-sized. Use set_fixmap(idx,phys) * to associate physical memory with a fixmap index. */enum fixed_addresses {	FIX_HOLE, 	/*	 * Reserve a virtual window for the FDT that is a page bigger than the	 * maximum supported size. The additional space ensures that any FDT	 * that does not exceed MAX_FDT_SIZE can be mapped regardless of	 * whether it crosses any page boundary.	 */	FIX_FDT_END,	FIX_FDT = FIX_FDT_END + DIV_ROUND_UP(MAX_FDT_SIZE, PAGE_SIZE) + 1, 	FIX_EARLYCON_MEM_BASE,	FIX_TEXT_POKE0, #ifdef CONFIG_KVM	/* One slot per CPU, mapping the guest's VNCR page at EL2. */	FIX_VNCR_END,	FIX_VNCR = FIX_VNCR_END + NR_CPUS,#endif #ifdef CONFIG_ACPI_APEI_GHES	/* Used for GHES mapping from assorted contexts */	FIX_APEI_GHES_IRQ,	FIX_APEI_GHES_SEA,#ifdef CONFIG_ARM_SDE_INTERFACE	FIX_APEI_GHES_SDEI_NORMAL,	FIX_APEI_GHES_SDEI_CRITICAL,#endif#endif /* CONFIG_ACPI_APEI_GHES */ #ifdef CONFIG_UNMAP_KERNEL_AT_EL0#ifdef CONFIG_RELOCATABLE	FIX_ENTRY_TRAMP_TEXT4,	/* one extra slot for the data page */#endif	FIX_ENTRY_TRAMP_TEXT3,	FIX_ENTRY_TRAMP_TEXT2,	FIX_ENTRY_TRAMP_TEXT1,#define TRAMP_VALIAS		(__fix_to_virt(FIX_ENTRY_TRAMP_TEXT1))#endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */	__end_of_permanent_fixed_addresses, 	/*	 * Temporary boot-time mappings, used by early_ioremap(),	 * before ioremap() is functional.	 *	 * Reserve one extra page so a 256K mapping may start at any	 * offset within a page. early_ioremap() maps the page-aligned	 * physical range, so the initial offset can consume an extra page.	 */#define NR_FIX_BTMAPS		((SZ_256K / PAGE_SIZE) + 1)#define FIX_BTMAPS_SLOTS	7#define TOTAL_FIX_BTMAPS	(NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 	FIX_BTMAP_END = __end_of_permanent_fixed_addresses,	FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 	/*	 * Used for kernel page table creation, so unmapped memory may be used	 * for tables.	 */	FIX_PTE,	FIX_PMD,	FIX_PUD,	FIX_P4D,	FIX_PGD, 	__end_of_fixed_addresses}; #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) #define FIXMAP_PAGE_IO     __pgprot(PROT_DEVICE_nGnRE) void __init early_fixmap_init(void); #define __early_set_fixmap __set_fixmap extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); #include <asm-generic/fixmap.h> #endif /* !__ASSEMBLER__ */#endif /* _ASM_ARM64_FIXMAP_H */