| 1 |
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| 2 | |
| 3 | * fixmap.h: compile-time virtual memory allocation
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| 4 | *
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| 5 | * Copyright (C) 1998 Ingo Molnar
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| 6 | *
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| 7 | * Copyright 2008 Freescale Semiconductor Inc.
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| 8 | * Port to powerpc added by Kumar Gala
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| 9 | *
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| 10 | * Copyright 2011 Michal Simek <[email protected]>
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| 11 | * Copyright 2011 PetaLogix Qld Pty Ltd
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| 12 | * Port to Microblaze
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| 13 |
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| 14 |
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| 15 | #ifndef _ASM_FIXMAP_H
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| 16 | #define _ASM_FIXMAP_H
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| 17 |
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| 18 | #ifndef __ASSEMBLER__
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| 19 | #include <linux/kernel.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 | #define FIXADDR_TOP ((unsigned long)(-PAGE_SIZE))
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| 27 |
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| 28 | |
| 29 | * Here we define all the compile-time 'special' virtual
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| 30 | * addresses. The point is to have a constant address at
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| 31 | * compile time, but to set the physical address only
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| 32 | * in the boot process. We allocate these special addresses
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| 33 | * from the end of virtual memory (0xfffff000) backwards.
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| 34 | * Also this lets us do fail-safe vmalloc(), we
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| 35 | * can guarantee that these special addresses and
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| 36 | * vmalloc()-ed addresses never overlap.
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| 37 | *
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| 38 | * these 'compile-time allocated' memory buffers are
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| 39 | * fixed-size 4k pages. (or larger if used with an increment
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| 40 | * highger than 1) use fixmap_set(idx,phys) to associate
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| 41 | * physical memory with fixmap indices.
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| 42 | *
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| 43 | * TLB entries of such buffers will not be flushed across
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| 44 | * task switches.
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| 45 |
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| 46 | enum fixed_addresses {
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| 47 | FIX_HOLE,
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| 48 | #ifdef CONFIG_HIGHMEM
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| 49 | FIX_KMAP_BEGIN,
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| 50 | FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * num_possible_cpus()) - 1,
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| 51 | #endif
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| 52 | __end_of_fixed_addresses
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| 53 | };
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| 54 |
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| 55 | extern void __set_fixmap(enum fixed_addresses idx,
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| 56 | phys_addr_t phys, pgprot_t flags);
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| 57 |
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| 58 | #define __FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
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| 59 | #define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE)
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| 60 |
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| 61 | #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_CI
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| 62 |
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| 63 | #include <asm-generic/fixmap.h>
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| 64 |
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| 65 | #endif
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| 66 | #endif
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