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/*
* fixmap.h: compile-time virtual memory allocation
*
* 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) 1998 Ingo Molnar
*
* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
*/
#ifndef _ASM_FIXMAP_H
#define _ASM_FIXMAP_H
#include <linux/config.h>
#include <linux/kernel.h>
#include <asm/apicdef.h>
#include <asm/page.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.
*/
enum fixed_addresses {
#ifdef CONFIG_HIGHMEM_XXX
FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
#endif
FIX_BLKRING_BASE,
FIX_NETRING0_BASE,
FIX_NETRING1_BASE,
FIX_NETRING2_BASE,
FIX_NETRING3_BASE,
FIX_SHARED_INFO,
#ifdef CONFIG_VGA_CONSOLE
#define NR_FIX_BTMAPS 32 /* 128KB For the Dom0 VGA Console A0000-C0000 */
#else
#define NR_FIX_BTMAPS 1 /* in case anyone wants it in future... */
#endif
FIX_BTMAP_END,
FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS - 1,
/* our bt_ioremap is permanent, unlike other architectures */
__end_of_permanent_fixed_addresses,
__end_of_fixed_addresses = __end_of_permanent_fixed_addresses
};
extern void __set_fixmap (enum fixed_addresses idx,
unsigned long phys, pgprot_t flags);
#define set_fixmap(idx, phys) \
__set_fixmap(idx, phys, PAGE_KERNEL)
/*
* Some hardware wants to get fixmapped without caching.
*/
#define set_fixmap_nocache(idx, phys) \
__set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
extern void clear_fixmap(enum fixed_addresses idx);
/*
* 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 (HYPERVISOR_VIRT_START - 2*PAGE_SIZE)
#define __FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
#define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE)
#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
/*
* 'index to address' translation. If anyone tries to use the idx
* directly without tranlation, we catch the bug with a NULL-deference
* kernel oops. Illegal ranges of incoming indices are caught too.
*/
static inline unsigned long fix_to_virt(unsigned int idx)
{
return __fix_to_virt(idx);
}
#endif
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