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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __UM_FIXMAP_H
#define __UM_FIXMAP_H

#include <asm/processor.h>
#include <asm/kmap_types.h>
#include <asm/archparam.h>
#include <asm/page.h>
#include <linux/threads.h>

/*
 * Here we define all the compile-time 'special' virtual
 * addresses. The point is to have a constant address at
 * compile time, but to set the physical address only
 * in the boot process. We allocate these special  addresses
 * from the end of virtual memory (0xfffff000) backwards.
 * Also this lets us do fail-safe vmalloc(), we
 * can guarantee that these special addresses and
 * vmalloc()-ed addresses never overlap.
 *
 * these 'compile-time allocated' memory buffers are
 * fixed-size 4k pages. (or larger if used with an increment
 * highger than 1) use fixmap_set(idx,phys) to associate
 * physical memory with fixmap indices.
 *
 * TLB entries of such buffers will not be flushed across
 * task switches.
 */

/*
 * on UP currently we will have no trace of the fixmap mechanizm,
 * no page table allocations, etc. This might change in the
 * future, say framebuffers for the console driver(s) could be
 * fix-mapped?
 */
enum fixed_addresses {
	__end_of_fixed_addresses
};

extern void __set_fixmap (enum fixed_addresses idx,
			  unsigned long phys, pgprot_t flags);

/*
 * used by vmalloc.c.
 *
 * Leave one empty page between vmalloc'ed areas and
 * the start of the fixmap, and leave one page empty
 * at the top of mem..
 */

#define FIXADDR_TOP	(TASK_SIZE - 2 * PAGE_SIZE)
#define FIXADDR_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)
#define FIXADDR_START	(FIXADDR_TOP - FIXADDR_SIZE)

#include <asm-generic/fixmap.h>

#endif

Filemanager

Name Type Size Permission Actions
Kbuild File 702 B 0644
a.out-core.h File 695 B 0644
bugs.h File 111 B 0644
cache.h File 483 B 0644
common.lds.S File 1.76 KB 0644
dma.h File 180 B 0644
fixmap.h File 1.63 KB 0644
hardirq.h File 558 B 0644
io.h File 339 B 0644
irq.h File 493 B 0644
irqflags.h File 865 B 0644
kmap_types.h File 219 B 0644
kvm_para.h File 34 B 0644
mmu.h File 558 B 0644
mmu_context.h File 1.87 KB 0644
page.h File 3.15 KB 0644
pgalloc.h File 1.46 KB 0644
pgtable-2level.h File 1.32 KB 0644
pgtable-3level.h File 2.88 KB 0644
pgtable.h File 9.88 KB 0644
processor-generic.h File 1.87 KB 0644
ptrace-generic.h File 1.13 KB 0644
sections.h File 219 B 0644
setup.h File 273 B 0644
smp.h File 121 B 0644
stacktrace.h File 1.06 KB 0644
syscall-generic.h File 2.67 KB 0644
sysrq.h File 182 B 0644
thread_info.h File 2.15 KB 0644
timex.h File 151 B 0644
tlb.h File 4.23 KB 0644
tlbflush.h File 978 B 0644
uaccess.h File 1.65 KB 0644
unwind.h File 213 B 0644