| 1 |
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| 2 | #ifndef _ASM_FIXMAP_H
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| 3 | #define _ASM_FIXMAP_H
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| 4 |
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| 5 | |
| 6 | * This file defines the locations of the fixed mappings on parisc.
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| 7 | *
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| 8 | * All of the values in this file are machine virtual addresses.
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| 9 | *
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| 10 | * All of the values in this file must be <4GB (because of assembly
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| 11 | * loading restrictions). If you place this region anywhere above
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| 12 | * __PAGE_OFFSET, you must adjust the memory map accordingly
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| 13 |
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| 14 |
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| 15 | |
| 16 | * The tmpalias region is used in kernel space to copy/clear/flush data
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| 17 | * from pages congruently mapped with user space. It is comprised of
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| 18 | * a pair regions. The size of these regions is determined by the largest
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| 19 | * cache aliasing boundary for machines that support equivalent aliasing.
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| 20 | *
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| 21 | * The c3750 with PA8700 processor returns an alias value of 11. This
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| 22 | * indicates that it has an alias boundary of 4 MB. It also supports
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| 23 | * non-equivalent aliasing without a performance penalty.
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| 24 | *
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| 25 | * Machines with PA8800/PA8900 processors return an alias value of 0.
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| 26 | * This indicates the alias boundary is unknown and may be larger than
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| 27 | * 16 MB. Non-equivalent aliasing is not supported.
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| 28 | *
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| 29 | * Here we assume the maximum alias boundary is 4 MB.
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| 30 |
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| 31 | #define TMPALIAS_SIZE_BITS 22
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| 32 | #define TMPALIAS_MAP_START ((__PAGE_OFFSET) - (2 << TMPALIAS_SIZE_BITS))
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| 33 |
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| 34 | #define FIXMAP_SIZE (FIX_BITMAP_COUNT << PAGE_SHIFT)
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| 35 | #define FIXMAP_START (TMPALIAS_MAP_START - FIXMAP_SIZE)
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| 36 | |
| 37 | * usually, it extends up to TMPALIAS_MAP_START. Virtual addresses
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| 38 | * 0..GATEWAY_PAGE_SIZE are reserved for the gateway page
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| 39 | #define KERNEL_MAP_START (GATEWAY_PAGE_SIZE)
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| 40 | #define KERNEL_MAP_END (FIXMAP_START)
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| 41 |
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| 42 | #ifndef __ASSEMBLER__
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| 43 |
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| 44 |
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| 45 | enum fixed_addresses {
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| 46 |
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| 47 | FIX_TEXT_POKE0,
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| 48 | FIX_TEXT_KEXEC,
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| 49 | FIX_BITMAP_COUNT
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| 50 | };
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| 51 |
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| 52 | extern void *parisc_vmalloc_start;
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| 53 | #define PCXL_DMA_MAP_SIZE (8*1024*1024)
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| 54 | #define VMALLOC_START ((unsigned long)parisc_vmalloc_start)
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| 55 | #define VMALLOC_END (KERNEL_MAP_END)
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| 56 |
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| 57 | #define __fix_to_virt(_x) (FIXMAP_START + ((_x) << PAGE_SHIFT))
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| 58 |
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| 59 | void set_fixmap(enum fixed_addresses idx, phys_addr_t phys);
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| 60 | void clear_fixmap(enum fixed_addresses idx);
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| 61 |
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| 62 | #endif
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| 63 |
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| 64 | #endif
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