/* * 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 2008 Freescale Semiconductor Inc. *   Port to powerpc added by Kumar Gala */ #ifndef _ASM_FIXMAP_H#define _ASM_FIXMAP_H #ifndef __ASSEMBLER__#include <linux/sizes.h>#include <linux/pgtable.h>#include <asm/page.h>#ifdef CONFIG_HIGHMEM#include <linux/threads.h>#include <asm/kmap_size.h>#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. 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 * highger than 1) use fixmap_set(idx,phys) to associate * physical memory with fixmap indices. * * TLB entries of such buffers will not be flushed across * task switches. */enum fixed_addresses {	FIX_HOLE,#ifdef CONFIG_PPC32	/* reserve the top 128K for early debugging purposes */	FIX_EARLY_DEBUG_TOP = FIX_HOLE,	FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+(ALIGN(SZ_128K, PAGE_SIZE)/PAGE_SIZE)-1,#ifdef CONFIG_HIGHMEM	FIX_KMAP_BEGIN,	/* reserved pte's for temporary kernel mappings */	FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1,#endif#ifdef CONFIG_PPC_8xx	/* For IMMR we need an aligned 512K area */#define FIX_IMMR_SIZE	(512 * 1024 / PAGE_SIZE)	FIX_IMMR_START,	FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 +		       FIX_IMMR_SIZE,#endif#ifdef CONFIG_PPC_83xx	/* For IMMR we need an aligned 2M area */#define FIX_IMMR_SIZE	(SZ_2M / PAGE_SIZE)	FIX_IMMR_START,	FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 +		       FIX_IMMR_SIZE,#endif	/* FIX_PCIE_MCFG, */#endif /* CONFIG_PPC32 */	__end_of_permanent_fixed_addresses, #define NR_FIX_BTMAPS		(SZ_256K / PAGE_SIZE)#define FIX_BTMAPS_SLOTS	16#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,	__end_of_fixed_addresses}; #define __FIXADDR_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)#define FIXADDR_START		(FIXADDR_TOP - __FIXADDR_SIZE) #define FIXMAP_ALIGNED_SIZE	(ALIGN(FIXADDR_TOP, PGDIR_SIZE) - \				 ALIGN_DOWN(FIXADDR_START, PGDIR_SIZE))#define FIXMAP_PTE_SIZE	(FIXMAP_ALIGNED_SIZE / PGDIR_SIZE * PTE_TABLE_SIZE) #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NCG#define FIXMAP_PAGE_IO	PAGE_KERNEL_NCG #include <asm-generic/fixmap.h> static inline void __set_fixmap(enum fixed_addresses idx,				phys_addr_t phys, pgprot_t flags){	BUILD_BUG_ON(IS_ENABLED(CONFIG_PPC64) && __FIXADDR_SIZE > FIXADDR_SIZE); 	if (__builtin_constant_p(idx))		BUILD_BUG_ON(idx >= __end_of_fixed_addresses);	else if (WARN_ON(idx >= __end_of_fixed_addresses))		return;	if (pgprot_val(flags))		map_kernel_page(__fix_to_virt(idx), phys, flags);	else		unmap_kernel_page(__fix_to_virt(idx));} #define __early_set_fixmap	__set_fixmap #ifdef CONFIG_PPC_8xx#define VIRT_IMMR_BASE (__fix_to_virt(FIX_IMMR_BASE))#endif #endif /* !__ASSEMBLER__ */#endif