ia64/linux-2.6.18-xen.hg

view include/asm-i386/highmem.h @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
1 /*
2 * highmem.h: virtual kernel memory mappings for high memory
3 *
4 * Used in CONFIG_HIGHMEM systems for memory pages which
5 * are not addressable by direct kernel virtual addresses.
6 *
7 * Copyright (C) 1999 Gerhard Wichert, Siemens AG
8 * Gerhard.Wichert@pdb.siemens.de
9 *
10 *
11 * Redesigned the x86 32-bit VM architecture to deal with
12 * up to 16 Terabyte physical memory. With current x86 CPUs
13 * we now support up to 64 Gigabytes physical RAM.
14 *
15 * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
16 */
18 #ifndef _ASM_HIGHMEM_H
19 #define _ASM_HIGHMEM_H
21 #ifdef __KERNEL__
23 #include <linux/interrupt.h>
24 #include <linux/threads.h>
25 #include <asm/kmap_types.h>
26 #include <asm/tlbflush.h>
28 /* declarations for highmem.c */
29 extern unsigned long highstart_pfn, highend_pfn;
31 extern pte_t *kmap_pte;
32 extern pgprot_t kmap_prot;
33 extern pte_t *pkmap_page_table;
35 /*
36 * Right now we initialize only a single pte table. It can be extended
37 * easily, subsequent pte tables have to be allocated in one physical
38 * chunk of RAM.
39 */
40 #ifdef CONFIG_X86_PAE
41 #define LAST_PKMAP 512
42 #else
43 #define LAST_PKMAP 1024
44 #endif
45 /*
46 * Ordering is:
47 *
48 * FIXADDR_TOP
49 * fixed_addresses
50 * FIXADDR_START
51 * temp fixed addresses
52 * FIXADDR_BOOT_START
53 * Persistent kmap area
54 * PKMAP_BASE
55 * VMALLOC_END
56 * Vmalloc area
57 * VMALLOC_START
58 * high_memory
59 */
60 #define PKMAP_BASE ( (FIXADDR_BOOT_START - PAGE_SIZE*(LAST_PKMAP + 1)) & PMD_MASK )
61 #define LAST_PKMAP_MASK (LAST_PKMAP-1)
62 #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
63 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
65 extern void * FASTCALL(kmap_high(struct page *page));
66 extern void FASTCALL(kunmap_high(struct page *page));
68 void *kmap(struct page *page);
69 void kunmap(struct page *page);
70 void *kmap_atomic(struct page *page, enum km_type type);
71 void kunmap_atomic(void *kvaddr, enum km_type type);
72 void *kmap_atomic_pfn(unsigned long pfn, enum km_type type);
73 struct page *kmap_atomic_to_page(void *ptr);
75 #define flush_cache_kmaps() do { } while (0)
77 #endif /* __KERNEL__ */
79 #endif /* _ASM_HIGHMEM_H */