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/*
* include/asm-xtensa/highmem.h
*
* 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) 2003 - 2005 Tensilica Inc.
* Copyright (C) 2014 Cadence Design Systems Inc.
*/
#ifndef _XTENSA_HIGHMEM_H
#define _XTENSA_HIGHMEM_H
#include <linux/wait.h>
#include <asm/cacheflush.h>
#include <asm/fixmap.h>
#include <asm/kmap_types.h>
#include <asm/pgtable.h>
#define PKMAP_BASE ((FIXADDR_START - \
(LAST_PKMAP + 1) * PAGE_SIZE) & PMD_MASK)
#define LAST_PKMAP (PTRS_PER_PTE * DCACHE_N_COLORS)
#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
#define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
#define kmap_prot PAGE_KERNEL_EXEC
#if DCACHE_WAY_SIZE > PAGE_SIZE
#define get_pkmap_color get_pkmap_color
static inline int get_pkmap_color(struct page *page)
{
return DCACHE_ALIAS(page_to_phys(page));
}
extern unsigned int last_pkmap_nr_arr[];
static inline unsigned int get_next_pkmap_nr(unsigned int color)
{
last_pkmap_nr_arr[color] =
(last_pkmap_nr_arr[color] + DCACHE_N_COLORS) & LAST_PKMAP_MASK;
return last_pkmap_nr_arr[color] + color;
}
static inline int no_more_pkmaps(unsigned int pkmap_nr, unsigned int color)
{
return pkmap_nr < DCACHE_N_COLORS;
}
static inline int get_pkmap_entries_count(unsigned int color)
{
return LAST_PKMAP / DCACHE_N_COLORS;
}
extern wait_queue_head_t pkmap_map_wait_arr[];
static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
{
return pkmap_map_wait_arr + color;
}
#endif
extern pte_t *pkmap_page_table;
void *kmap_high(struct page *page);
void kunmap_high(struct page *page);
static inline void *kmap(struct page *page)
{
/* Check if this memory layout is broken because PKMAP overlaps
* page table.
*/
BUILD_BUG_ON(PKMAP_BASE <
XCHAL_PAGE_TABLE_VADDR + XCHAL_PAGE_TABLE_SIZE);
BUG_ON(in_interrupt());
if (!PageHighMem(page))
return page_address(page);
return kmap_high(page);
}
static inline void kunmap(struct page *page)
{
BUG_ON(in_interrupt());
if (!PageHighMem(page))
return;
kunmap_high(page);
}
static inline void flush_cache_kmaps(void)
{
flush_cache_all();
}
void *kmap_atomic(struct page *page);
void __kunmap_atomic(void *kvaddr);
void kmap_init(void);
#endif
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