60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
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/*
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* High memory support for Xtensa architecture
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of
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* this archive for more details.
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*
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* Copyright (C) 2014 Cadence Design Systems Inc.
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*/
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#include <linux/export.h>
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#include <linux/highmem.h>
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#include <asm/tlbflush.h>
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#if DCACHE_WAY_SIZE > PAGE_SIZE
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unsigned int last_pkmap_nr_arr[DCACHE_N_COLORS];
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wait_queue_head_t pkmap_map_wait_arr[DCACHE_N_COLORS];
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static void __init kmap_waitqueues_init(void)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(pkmap_map_wait_arr); ++i)
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init_waitqueue_head(pkmap_map_wait_arr + i);
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}
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static inline enum fixed_addresses kmap_idx(int type, unsigned long color)
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{
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int idx = (type + KM_MAX_IDX * smp_processor_id()) * DCACHE_N_COLORS;
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/*
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* The fixmap operates top down, so the color offset needs to be
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* reverse as well.
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*/
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return idx + DCACHE_N_COLORS - 1 - color;
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}
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enum fixed_addresses kmap_local_map_idx(int type, unsigned long pfn)
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{
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return kmap_idx(type, DCACHE_ALIAS(pfn << PAGE_SHIFT));
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}
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enum fixed_addresses kmap_local_unmap_idx(int type, unsigned long addr)
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{
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return kmap_idx(type, DCACHE_ALIAS(addr));
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}
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#else
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static inline void kmap_waitqueues_init(void) { }
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#endif
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void __init kmap_init(void)
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{
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/* Check if this memory layout is broken because PKMAP overlaps
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* page table.
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*/
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BUILD_BUG_ON(PKMAP_BASE < TLBTEMP_BASE_1 + TLBTEMP_SIZE);
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kmap_waitqueues_init();
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}
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