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