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