| 1 | /* |
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| 2 | * High memory support for Xtensa architecture |
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| 3 | * |
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| 4 | * This file is subject to the terms and conditions of the GNU General |
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| 5 | * Public License. See the file "COPYING" in the main directory of |
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| 6 | * this archive for more details. |
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| 7 | * |
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| 8 | * Copyright (C) 2014 Cadence Design Systems Inc. |
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| 9 | */ |
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| 10 | |
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| 11 | #include <linux/export.h> |
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| 12 | #include <linux/highmem.h> |
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| 13 | #include <asm/tlbflush.h> |
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| 14 | |
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| 15 | #if DCACHE_WAY_SIZE > PAGE_SIZE |
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| 16 | unsigned int last_pkmap_nr_arr[DCACHE_N_COLORS]; |
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| 17 | wait_queue_head_t pkmap_map_wait_arr[DCACHE_N_COLORS]; |
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| 18 | |
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| 19 | static void __init kmap_waitqueues_init(void) |
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| 20 | { |
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| 21 | unsigned int i; |
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| 22 | |
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| 23 | for (i = 0; i < ARRAY_SIZE(pkmap_map_wait_arr); ++i) |
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| 24 | init_waitqueue_head(pkmap_map_wait_arr + i); |
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| 25 | } |
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| 26 | |
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| 27 | static inline enum fixed_addresses kmap_idx(int type, unsigned long color) |
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| 28 | { |
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| 29 | int idx = (type + KM_MAX_IDX * smp_processor_id()) * DCACHE_N_COLORS; |
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| 30 | |
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| 31 | /* |
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| 32 | * The fixmap operates top down, so the color offset needs to be |
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| 33 | * reverse as well. |
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| 34 | */ |
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| 35 | return idx + DCACHE_N_COLORS - 1 - color; |
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| 36 | } |
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| 37 | |
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| 38 | enum fixed_addresses kmap_local_map_idx(int type, unsigned long pfn) |
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| 39 | { |
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| 40 | return kmap_idx(type, DCACHE_ALIAS(pfn << PAGE_SHIFT)); |
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| 41 | } |
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| 42 | |
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| 43 | enum fixed_addresses kmap_local_unmap_idx(int type, unsigned long addr) |
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| 44 | { |
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| 45 | return kmap_idx(type, DCACHE_ALIAS(addr)); |
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| 46 | } |
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| 47 | |
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| 48 | #else |
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| 49 | static inline void kmap_waitqueues_init(void) { } |
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| 50 | #endif |
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| 51 | |
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| 52 | void __init kmap_init(void) |
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| 53 | { |
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| 54 | /* Check if this memory layout is broken because PKMAP overlaps |
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| 55 | * page table. |
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| 56 | */ |
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| 57 | BUILD_BUG_ON(PKMAP_BASE < TLBTEMP_BASE_1 + TLBTEMP_SIZE); |
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| 58 | kmap_waitqueues_init(); |
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| 59 | } |
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| 60 | |
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