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/* SPDX-License-Identifier: GPL-2.0 */
/*
 * highmem.h: virtual kernel memory mappings for high memory
 *
 * Used in CONFIG_HIGHMEM systems for memory pages which
 * are not addressable by direct kernel virtual addresses.
 *
 * Copyright (C) 1999 Gerhard Wichert, Siemens AG
 *		      Gerhard.Wichert@pdb.siemens.de
 *
 *
 * Redesigned the x86 32-bit VM architecture to deal with
 * up to 16 Terabyte physical memory. With current x86 CPUs
 * we now support up to 64 Gigabytes physical RAM.
 *
 * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
 */
#ifndef _ASM_HIGHMEM_H
#define _ASM_HIGHMEM_H

#ifdef __KERNEL__

#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/uaccess.h>
#include <asm/fixmap.h>

extern pte_t *kmap_pte;
extern pgprot_t kmap_prot;
extern pte_t *pkmap_page_table;

/*
 * Right now we initialize only a single pte table. It can be extended
 * easily, subsequent pte tables have to be allocated in one physical
 * chunk of RAM.
 */
/*
 * We use one full pte table with 4K pages. And with 16K/64K/256K pages pte
 * table covers enough memory (32MB/512MB/2GB resp.), so that both FIXMAP
 * and PKMAP can be placed in a single pte table. We use 512 pages for PKMAP
 * in case of 16K/64K/256K page sizes.
 */

#define PKMAP_ORDER	PTE_SHIFT
#define LAST_PKMAP	(1 << PKMAP_ORDER)

#define PKMAP_BASE	((FIXADDR_START - PAGE_SIZE * (LAST_PKMAP + 1)) \
								& PMD_MASK)

#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))

extern void *kmap_high(struct page *page);
extern void kunmap_high(struct page *page);
extern void *kmap_atomic_prot(struct page *page, pgprot_t prot);
extern void __kunmap_atomic(void *kvaddr);

static inline void *kmap(struct page *page)
{
	might_sleep();
	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 *kmap_atomic(struct page *page)
{
	return kmap_atomic_prot(page, kmap_prot);
}

#define flush_cache_kmaps()	{ flush_icache(); flush_dcache(); }

#endif /* __KERNEL__ */

#endif /* _ASM_HIGHMEM_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 742 B 0644
asm-compat.h File 518 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 626 B 0644
cache.h File 644 B 0644
cacheflush.h File 4.12 KB 0644
checksum.h File 942 B 0644
cmpxchg.h File 919 B 0644
cpuinfo.h File 2.13 KB 0644
cputable.h File 1 B 0644
current.h File 850 B 0644
delay.h File 2.26 KB 0644
dma-mapping.h File 765 B 0644
dma.h File 706 B 0644
elf.h File 738 B 0644
entry.h File 1.13 KB 0644
exceptions.h File 2.08 KB 0644
fixmap.h File 1.96 KB 0644
flat.h File 2.26 KB 0644
ftrace.h File 641 B 0644
futex.h File 2.13 KB 0644
hash.h File 2.37 KB 0644
highmem.h File 2.2 KB 0644
hw_irq.h File 1 B 0644
io.h File 2.05 KB 0644
irq.h File 538 B 0644
irqflags.h File 2.6 KB 0644
kgdb.h File 739 B 0644
mmu.h File 4.19 KB 0644
mmu_context.h File 141 B 0644
mmu_context_mm.h File 3.91 KB 0644
module.h File 840 B 0644
page.h File 6.11 KB 0644
pci-bridge.h File 4.57 KB 0644
pci.h File 2.47 KB 0644
pgalloc.h File 4.74 KB 0644
pgtable.h File 17.66 KB 0644
processor.h File 4.11 KB 0644
prom.h File 713 B 0644
ptrace.h File 727 B 0644
pvr.h File 8.72 KB 0644
registers.h File 1.65 KB 0644
seccomp.h File 256 B 0644
sections.h File 637 B 0644
setup.h File 1.37 KB 0644
string.h File 630 B 0644
switch_to.h File 629 B 0644
syscall.h File 2.26 KB 0644
thread_info.h File 4.01 KB 0644
timex.h File 402 B 0644
tlb.h File 714 B 0644
tlbflush.h File 2.04 KB 0644
uaccess.h File 9.98 KB 0644
unaligned.h File 871 B 0644
unistd.h File 1.19 KB 0644
unwind.h File 719 B 0644
user.h File 1 B 0644