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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 <linux/sizes.h>
19#include <linux/pgtable.h>
20#include <asm/page.h>
21#ifdef CONFIG_HIGHMEM
22#include <linux/threads.h>
23#include <asm/kmap_size.h>
24#endif
25
26#ifdef CONFIG_PPC64
27#define FIXADDR_TOP (IOREMAP_END + FIXADDR_SIZE)
28#else
29#define FIXADDR_SIZE 0
30#ifdef CONFIG_KASAN
31#include <asm/kasan.h>
32#define FIXADDR_TOP (KASAN_SHADOW_START - PAGE_SIZE)
33#else
34#define FIXADDR_TOP ((unsigned long)(-PAGE_SIZE))
35#endif
36#endif
37
38/*
39 * Here we define all the compile-time 'special' virtual
40 * addresses. The point is to have a constant address at
41 * compile time, but to set the physical address only
42 * in the boot process. We allocate these special addresses
43 * from the end of virtual memory (0xfffff000) backwards.
44 * Also this lets us do fail-safe vmalloc(), we
45 * can guarantee that these special addresses and
46 * vmalloc()-ed addresses never overlap.
47 *
48 * these 'compile-time allocated' memory buffers are
49 * fixed-size 4k pages. (or larger if used with an increment
50 * highger than 1) use fixmap_set(idx,phys) to associate
51 * physical memory with fixmap indices.
52 *
53 * TLB entries of such buffers will not be flushed across
54 * task switches.
55 */
56enum fixed_addresses {
57 FIX_HOLE,
58#ifdef CONFIG_PPC32
59 /* reserve the top 128K for early debugging purposes */
60 FIX_EARLY_DEBUG_TOP = FIX_HOLE,
61 FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+(ALIGN(SZ_128K, PAGE_SIZE)/PAGE_SIZE)-1,
62#ifdef CONFIG_HIGHMEM
63 FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
64 FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1,
65#endif
66#ifdef CONFIG_PPC_8xx
67 /* For IMMR we need an aligned 512K area */
68#define FIX_IMMR_SIZE (512 * 1024 / PAGE_SIZE)
69 FIX_IMMR_START,
70 FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 +
71 FIX_IMMR_SIZE,
72#endif
73#ifdef CONFIG_PPC_83xx
74 /* For IMMR we need an aligned 2M area */
75#define FIX_IMMR_SIZE (SZ_2M / PAGE_SIZE)
76 FIX_IMMR_START,
77 FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 +
78 FIX_IMMR_SIZE,
79#endif
80 /* FIX_PCIE_MCFG, */
81#endif /* CONFIG_PPC32 */
82 __end_of_permanent_fixed_addresses,
83
84#define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE)
85#define FIX_BTMAPS_SLOTS 16
86#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
87
88 FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
89 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
90 __end_of_fixed_addresses
91};
92
93#define __FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
94#define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE)
95
96#define FIXMAP_ALIGNED_SIZE (ALIGN(FIXADDR_TOP, PGDIR_SIZE) - \
97 ALIGN_DOWN(FIXADDR_START, PGDIR_SIZE))
98#define FIXMAP_PTE_SIZE (FIXMAP_ALIGNED_SIZE / PGDIR_SIZE * PTE_TABLE_SIZE)
99
100#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NCG
101#define FIXMAP_PAGE_IO PAGE_KERNEL_NCG
102
103#include <asm-generic/fixmap.h>
104
105static inline void __set_fixmap(enum fixed_addresses idx,
106 phys_addr_t phys, pgprot_t flags)
107{
108 BUILD_BUG_ON(IS_ENABLED(CONFIG_PPC64) && __FIXADDR_SIZE > FIXADDR_SIZE);
109
110 if (__builtin_constant_p(idx))
111 BUILD_BUG_ON(idx >= __end_of_fixed_addresses);
112 else if (WARN_ON(idx >= __end_of_fixed_addresses))
113 return;
114 if (pgprot_val(flags))
115 map_kernel_page(__fix_to_virt(idx), phys, flags);
116 else
117 unmap_kernel_page(__fix_to_virt(idx));
118}
119
120#define __early_set_fixmap __set_fixmap
121
122#endif /* !__ASSEMBLY__ */
123#endif