From 03907beb680ee39bee212bb3cb170cb295238cda Mon Sep 17 00:00:00 2001 From: "kaf24@scramble.cl.cam.ac.uk" Date: Wed, 9 Jun 2004 16:36:08 +0000 Subject: bitkeeper revision 1.946 (40c73c7805slPvnfEohXfQoiriAESg) Rename Linux directories and upgrade build system. --- linux-2.4.26-xen-sparse/include/asm-xen/fixmap.h | 105 +++++++++++++++++++++++ 1 file changed, 105 insertions(+) create mode 100644 linux-2.4.26-xen-sparse/include/asm-xen/fixmap.h (limited to 'linux-2.4.26-xen-sparse/include/asm-xen/fixmap.h') diff --git a/linux-2.4.26-xen-sparse/include/asm-xen/fixmap.h b/linux-2.4.26-xen-sparse/include/asm-xen/fixmap.h new file mode 100644 index 0000000000..338bd4ba2c --- /dev/null +++ b/linux-2.4.26-xen-sparse/include/asm-xen/fixmap.h @@ -0,0 +1,105 @@ +/* + * 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 +#include +#include +#include +#ifdef CONFIG_HIGHMEM +#include +#include +#endif + +/* + * 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 + 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 -- cgit v1.2.3