1/*
 2 * fixmap.h: compile-time virtual memory allocation
 3 *
 4 * This file is subject to the terms and conditions of the GNU General Public
 5 * License.  See the file "COPYING" in the main directory of this archive
 6 * for more details.
 7 *
 8 * Copyright (C) 1998 Ingo Molnar
 9 *
10 * Copyright 2008 Freescale Semiconductor Inc.
11 *   Port to powerpc added by Kumar Gala
12 */
13
14#ifndef _ASM_FIXMAP_H
15#define _ASM_FIXMAP_H
16
17#ifndef __ASSEMBLY__
18#include <linux/kernel.h>
19#include <asm/page.h>
 
20#ifdef CONFIG_HIGHMEM
21#include <linux/threads.h>
22#include <asm/kmap_types.h>
23#endif
24
 
 
 
 
25#define FIXADDR_TOP	((unsigned long)(-PAGE_SIZE))
 
26
27/*
28 * Here we define all the compile-time 'special' virtual
29 * addresses. The point is to have a constant address at
30 * compile time, but to set the physical address only
31 * in the boot process. We allocate these special addresses
32 * from the end of virtual memory (0xfffff000) backwards.
33 * Also this lets us do fail-safe vmalloc(), we
34 * can guarantee that these special addresses and
35 * vmalloc()-ed addresses never overlap.
36 *
37 * these 'compile-time allocated' memory buffers are
38 * fixed-size 4k pages. (or larger if used with an increment
39 * highger than 1) use fixmap_set(idx,phys) to associate
40 * physical memory with fixmap indices.
41 *
42 * TLB entries of such buffers will not be flushed across
43 * task switches.
44 */
45enum fixed_addresses {
46	FIX_HOLE,
47	/* reserve the top 128K for early debugging purposes */
48	FIX_EARLY_DEBUG_TOP = FIX_HOLE,
49	FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+((128*1024)/PAGE_SIZE)-1,
50#ifdef CONFIG_HIGHMEM
51	FIX_KMAP_BEGIN,	/* reserved pte's for temporary kernel mappings */
52	FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
53#endif
 
 
 
 
 
 
 
54	/* FIX_PCIE_MCFG, */
55	__end_of_fixed_addresses
56};
57
58extern void __set_fixmap (enum fixed_addresses idx,
59					phys_addr_t phys, pgprot_t flags);
60
61#define __FIXADDR_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)
62#define FIXADDR_START		(FIXADDR_TOP - __FIXADDR_SIZE)
63
64#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NCG
65
66#include <asm-generic/fixmap.h>
 
 
 
 
 
 
67
68#endif /* !__ASSEMBLY__ */
69#endif

 1/*
 2 * fixmap.h: compile-time virtual memory allocation
 3 *
 4 * This file is subject to the terms and conditions of the GNU General Public
 5 * License.  See the file "COPYING" in the main directory of this archive
 6 * for more details.
 7 *
 8 * Copyright (C) 1998 Ingo Molnar
 9 *
10 * Copyright 2008 Freescale Semiconductor Inc.
11 *   Port to powerpc added by Kumar Gala
12 */
13
14#ifndef _ASM_FIXMAP_H
15#define _ASM_FIXMAP_H
16
17#ifndef __ASSEMBLY__
 
18#include <asm/page.h>
19#include <asm/pgtable.h>
20#ifdef CONFIG_HIGHMEM
21#include <linux/threads.h>
22#include <asm/kmap_types.h>
23#endif
24
25#ifdef CONFIG_KASAN
26#include <asm/kasan.h>
27#define FIXADDR_TOP	(KASAN_SHADOW_START - PAGE_SIZE)
28#else
29#define FIXADDR_TOP	((unsigned long)(-PAGE_SIZE))
30#endif
31
32/*
33 * Here we define all the compile-time 'special' virtual
34 * addresses. The point is to have a constant address at
35 * compile time, but to set the physical address only
36 * in the boot process. We allocate these special addresses
37 * from the end of virtual memory (0xfffff000) backwards.
38 * Also this lets us do fail-safe vmalloc(), we
39 * can guarantee that these special addresses and
40 * vmalloc()-ed addresses never overlap.
41 *
42 * these 'compile-time allocated' memory buffers are
43 * fixed-size 4k pages. (or larger if used with an increment
44 * highger than 1) use fixmap_set(idx,phys) to associate
45 * physical memory with fixmap indices.
46 *
47 * TLB entries of such buffers will not be flushed across
48 * task switches.
49 */
50enum fixed_addresses {
51	FIX_HOLE,
52	/* reserve the top 128K for early debugging purposes */
53	FIX_EARLY_DEBUG_TOP = FIX_HOLE,
54	FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+((128*1024)/PAGE_SIZE)-1,
55#ifdef CONFIG_HIGHMEM
56	FIX_KMAP_BEGIN,	/* reserved pte's for temporary kernel mappings */
57	FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
58#endif
59#ifdef CONFIG_PPC_8xx
60	/* For IMMR we need an aligned 512K area */
61#define FIX_IMMR_SIZE	(512 * 1024 / PAGE_SIZE)
62	FIX_IMMR_START,
63	FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 +
64		       FIX_IMMR_SIZE,
65#endif
66	/* FIX_PCIE_MCFG, */
67	__end_of_fixed_addresses
68};
69
 
 
 
70#define __FIXADDR_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)
71#define FIXADDR_START		(FIXADDR_TOP - __FIXADDR_SIZE)
72
73#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NCG
74
75#include <asm-generic/fixmap.h>
76
77static inline void __set_fixmap(enum fixed_addresses idx,
78				phys_addr_t phys, pgprot_t flags)
79{
80	map_kernel_page(fix_to_virt(idx), phys, flags);
81}
82
83#endif /* !__ASSEMBLY__ */
84#endif