/* * 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 [31mCONFIG_HIGHMEM[0m #include <linux/threads.h> #include <asm/kmap_types.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 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 [31mCONFIG_HIGHMEM[0m 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) #include <asm-generic/fixmap.h> #endif /* !__ASSEMBLY__ */ #endif /* _ASM_TILE_FIXMAP_H */ |