| /* | |
| * 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 | |
| */ | |
| #ifndef _ASM_FIXMAP_H | |
| #define _ASM_FIXMAP_H | |
| #include <asm/pgtable.h> | |
| #ifdef CONFIG_HIGHMEM | |
| #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 the consistent memory region 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. | |
| */ | |
| enum fixed_addresses { | |
| #ifdef CONFIG_HIGHMEM | |
| /* reserved pte's for temporary kernel mappings */ | |
| FIX_KMAP_BEGIN, | |
| FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1, | |
| #endif | |
| __end_of_fixed_addresses | |
| }; | |
| #define FIXADDR_TOP (VMALLOC_START - PAGE_SIZE) | |
| #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) | |
| #define FIXADDR_START ((FIXADDR_TOP - FIXADDR_SIZE) & PMD_MASK) | |
| #include <asm-generic/fixmap.h> | |
| #define kmap_get_fixmap_pte(vaddr) \ | |
| pte_offset_kernel( \ | |
| pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), \ | |
| (vaddr) \ | |
| ) | |
| #endif |