/* * Copyright (C) 1998 Ingo Molnar * Copyright 2010 Tilera Corporation. All Rights Reserved. * *   This program is free software; you can redistribute it and/or *   modify it under the terms of the GNU General Public License *   as published by the Free Software Foundation, version 2. * *   This program is distributed in the hope that it will be useful, but *   WITHOUT ANY WARRANTY; without even the implied warranty of *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or *   NON INFRINGEMENT.  See the GNU General Public License for *   more details. */ #ifndef _ASM_TILE_FIXMAP_H#define _ASM_TILE_FIXMAP_H #include <asm/page.h> #ifndef __ASSEMBLY__#include <linux/kernel.h>#ifdef CONFIG_HIGHMEM#include <linux/threads.h>#include <asm/kmap_types.h>#endif #define __fix_to_virt(x)	(FIXADDR_TOP - ((x) << PAGE_SHIFT))#define __virt_to_fix(x)	((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) /* * 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 supervisor virtual memory 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 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 {#ifdef __tilegx__	/*	 * TILEPro has unmapped memory above so the hole isn't needed,	 * and in any case the hole pushes us over a single 16MB pmd.	 */	FIX_HOLE,#endif#ifdef CONFIG_HIGHMEM	FIX_KMAP_BEGIN,	/* reserved pte's for temporary kernel mappings */	FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,#endif#ifdef __tilegx__  /* see homecache.c */	FIX_HOMECACHE_BEGIN,	FIX_HOMECACHE_END = FIX_HOMECACHE_BEGIN+(NR_CPUS)-1,#endif	__end_of_permanent_fixed_addresses, 	/*	 * Temporary boot-time mappings, used before ioremap() is functional.	 * Not currently needed by the Tile architecture.	 */#define NR_FIX_BTMAPS	0#if NR_FIX_BTMAPS	FIX_BTMAP_END = __end_of_permanent_fixed_addresses,	FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS - 1,	__end_of_fixed_addresses#else	__end_of_fixed_addresses = __end_of_permanent_fixed_addresses#endif}; #define __FIXADDR_SIZE	(__end_of_permanent_fixed_addresses << PAGE_SHIFT)#define __FIXADDR_BOOT_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)#define FIXADDR_START		(FIXADDR_TOP + PAGE_SIZE - __FIXADDR_SIZE)#define FIXADDR_BOOT_START	(FIXADDR_TOP + PAGE_SIZE - __FIXADDR_BOOT_SIZE) extern void __this_fixmap_does_not_exist(void); /* * 'index to address' translation. If anyone tries to use the idx * directly without tranlation, we catch the bug with a NULL-deference * kernel oops. Illegal ranges of incoming indices are caught too. */static __always_inline unsigned long fix_to_virt(const unsigned int idx){	/*	 * this branch gets completely eliminated after inlining,	 * except when someone tries to use fixaddr indices in an	 * illegal way. (such as mixing up address types or using	 * out-of-range indices).	 *	 * If it doesn't get removed, the linker will complain	 * loudly with a reasonably clear error message..	 */	if (idx >= __end_of_fixed_addresses)		__this_fixmap_does_not_exist(); 	return __fix_to_virt(idx);} static inline unsigned long virt_to_fix(const unsigned long vaddr){	BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);	return __virt_to_fix(vaddr);} #endif /* !__ASSEMBLY__ */ #endif /* _ASM_TILE_FIXMAP_H */