| 1 | |
| 2 | * fixmap.h: compile-time virtual memory allocation
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| 3 | *
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| 4 | * This file is subject to the terms and conditions of the GNU General Public
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| 5 | * License. See the file "COPYING" in the main directory of this archive
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| 6 | * for more details.
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| 7 | *
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| 8 | * Copyright (C) 1998 Ingo Molnar
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| 9 | *
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| 10 | * Copyright 2008 Freescale Semiconductor Inc.
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| 11 | * Port to powerpc added by Kumar Gala
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| 12 |
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| 13 |
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| 14 | #ifndef _ASM_FIXMAP_H
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| 15 | #define _ASM_FIXMAP_H
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| 16 |
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| 17 | #ifndef __ASSEMBLER__
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| 18 | #include <linux/sizes.h>
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| 19 | #include <linux/pgtable.h>
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| 20 | #include <asm/page.h>
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| 21 | #ifdef CONFIG_HIGHMEM
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| 22 | #include <linux/threads.h>
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| 23 | #include <asm/kmap_size.h>
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| 24 | #endif
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| 25 |
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| 26 | |
| 27 | * Here we define all the compile-time 'special' virtual
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| 28 | * addresses. The point is to have a constant address at
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| 29 | * compile time, but to set the physical address only
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| 30 | * in the boot process. We allocate these special addresses
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| 31 | * from the end of virtual memory (0xfffff000) backwards.
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| 32 | * Also this lets us do fail-safe vmalloc(), we
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| 33 | * can guarantee that these special addresses and
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| 34 | * vmalloc()-ed addresses never overlap.
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| 35 | *
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| 36 | * these 'compile-time allocated' memory buffers are
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| 37 | * fixed-size 4k pages. (or larger if used with an increment
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| 38 | * highger than 1) use fixmap_set(idx,phys) to associate
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| 39 | * physical memory with fixmap indices.
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| 40 | *
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| 41 | * TLB entries of such buffers will not be flushed across
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| 42 | * task switches.
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| 43 |
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| 44 | enum fixed_addresses {
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| 45 | FIX_HOLE,
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| 46 | #ifdef CONFIG_PPC32
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| 47 |
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| 48 | FIX_EARLY_DEBUG_TOP = FIX_HOLE,
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| 49 | FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+(ALIGN(SZ_128K, PAGE_SIZE)/PAGE_SIZE)-1,
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| 50 | #ifdef CONFIG_HIGHMEM
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| 51 | FIX_KMAP_BEGIN,
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| 52 | FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1,
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| 53 | #endif
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| 54 | #ifdef CONFIG_PPC_8xx
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| 55 |
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| 56 | #define FIX_IMMR_SIZE (512 * 1024 / PAGE_SIZE)
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| 57 | FIX_IMMR_START,
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| 58 | FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 +
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| 59 | FIX_IMMR_SIZE,
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| 60 | #endif
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| 61 | #ifdef CONFIG_PPC_83xx
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| 62 |
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| 63 | #define FIX_IMMR_SIZE (SZ_2M / PAGE_SIZE)
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| 64 | FIX_IMMR_START,
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| 65 | FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 +
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| 66 | FIX_IMMR_SIZE,
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| 67 | #endif
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| 68 |
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| 69 | #endif
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| 70 | __end_of_permanent_fixed_addresses,
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| 71 |
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| 72 | #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE)
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| 73 | #define FIX_BTMAPS_SLOTS 16
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| 74 | #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
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| 75 |
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| 76 | FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
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| 77 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
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| 78 | __end_of_fixed_addresses
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| 79 | };
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| 80 |
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| 81 | #define __FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
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| 82 | #define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE)
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| 83 |
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| 84 | #define FIXMAP_ALIGNED_SIZE (ALIGN(FIXADDR_TOP, PGDIR_SIZE) - \
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| 85 | ALIGN_DOWN(FIXADDR_START, PGDIR_SIZE))
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| 86 | #define FIXMAP_PTE_SIZE (FIXMAP_ALIGNED_SIZE / PGDIR_SIZE * PTE_TABLE_SIZE)
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| 87 |
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| 88 | #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NCG
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| 89 | #define FIXMAP_PAGE_IO PAGE_KERNEL_NCG
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| 90 |
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| 91 | #include <asm-generic/fixmap.h>
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| 92 |
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| 93 | static inline void __set_fixmap(enum fixed_addresses idx,
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| 94 | phys_addr_t phys, pgprot_t flags)
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| 95 | {
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| 96 | BUILD_BUG_ON(IS_ENABLED(CONFIG_PPC64) && __FIXADDR_SIZE > FIXADDR_SIZE);
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| 97 |
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| 98 | if (__builtin_constant_p(idx))
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| 99 | BUILD_BUG_ON(idx >= __end_of_fixed_addresses);
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| 100 | else if (WARN_ON(idx >= __end_of_fixed_addresses))
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| 101 | return;
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| 102 | if (pgprot_val(flags))
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| 103 | map_kernel_page(__fix_to_virt(idx), phys, flags);
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| 104 | else
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| 105 | unmap_kernel_page(__fix_to_virt(idx));
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| 106 | }
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| 107 |
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| 108 | #define __early_set_fixmap __set_fixmap
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| 109 |
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| 110 | #ifdef CONFIG_PPC_8xx
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| 111 | #define VIRT_IMMR_BASE (__fix_to_virt(FIX_IMMR_BASE))
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| 112 | #endif
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| 113 |
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| 114 | #endif
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| 115 | #endif
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