ia64/xen-unstable

view xen/include/xen/mm.h @ 14083:3746b3d4f301

alloc_boot_pages() allocates downwards from high memory.
This conserves low memory.

Provide new function alloc_boot_low_pages() for those callers who
actually require lowmem pages (e.g., below 4GB).

Based on a patch by Chris Lalancette <clalance@redhat.com>

Signed-off-by: Keir Fraser <keir@xensource.com>
author kfraser@localhost.localdomain
date Thu Feb 22 15:26:21 2007 +0000 (2007-02-22)
parents c988f781817d
children c64aa7fb7712
line source
1 /******************************************************************************
2 * include/xen/mm.h
3 *
4 * Definitions for memory pages, frame numbers, addresses, allocations, etc.
5 *
6 * Note that Xen must handle several different physical 'address spaces' and
7 * there is a consistent terminology for these:
8 *
9 * 1. gpfn/gpaddr: A guest-specific pseudo-physical frame number or address.
10 * 2. gmfn/gmaddr: A machine address from the p.o.v. of a particular guest.
11 * 3. mfn/maddr: A real machine frame number or address.
12 * 4. pfn/paddr: Used in 'polymorphic' functions that work across all
13 * address spaces, depending on context. See the pagetable
14 * conversion macros in asm-x86/page.h for examples.
15 * Also 'paddr_t' is big enough to store any physical address.
16 *
17 * This scheme provides consistent function and variable names even when
18 * different guests are running in different memory-management modes.
19 * 1. A guest running in auto-translated mode (e.g., shadow_mode_translate())
20 * will have gpfn == gmfn and gmfn != mfn.
21 * 2. A paravirtualised x86 guest will have gpfn != gmfn and gmfn == mfn.
22 * 3. A paravirtualised guest with no pseudophysical overlay will have
23 * gpfn == gpmfn == mfn.
24 *
25 * Copyright (c) 2002-2006, K A Fraser <keir@xensource.com>
26 */
28 #ifndef __XEN_MM_H__
29 #define __XEN_MM_H__
31 #include <xen/config.h>
32 #include <xen/types.h>
33 #include <xen/list.h>
34 #include <xen/spinlock.h>
36 struct domain;
37 struct page_info;
39 /* Boot-time allocator. Turns into generic allocator after bootstrap. */
40 paddr_t init_boot_allocator(paddr_t bitmap_start);
41 void init_boot_pages(paddr_t ps, paddr_t pe);
42 unsigned long alloc_boot_pages(
43 unsigned long nr_pfns, unsigned long pfn_align);
44 unsigned long alloc_boot_low_pages(
45 unsigned long nr_pfns, unsigned long pfn_align);
46 int reserve_boot_pages(unsigned long first_pfn, unsigned long nr_pfns);
47 void end_boot_allocator(void);
49 /* Generic allocator. These functions are *not* interrupt-safe. */
50 void init_heap_pages(
51 unsigned int zone, struct page_info *pg, unsigned long nr_pages);
52 struct page_info *alloc_heap_pages(
53 unsigned int zone, unsigned int cpu, unsigned int order);
54 void free_heap_pages(
55 unsigned int zone, struct page_info *pg, unsigned int order);
56 void scrub_heap_pages(void);
58 /* Xen suballocator. These functions are interrupt-safe. */
59 void init_xenheap_pages(paddr_t ps, paddr_t pe);
60 void *alloc_xenheap_pages(unsigned int order);
61 void free_xenheap_pages(void *v, unsigned int order);
62 #define alloc_xenheap_page() (alloc_xenheap_pages(0))
63 #define free_xenheap_page(v) (free_xenheap_pages(v,0))
65 /* Domain suballocator. These functions are *not* interrupt-safe.*/
66 void init_domheap_pages(paddr_t ps, paddr_t pe);
67 struct page_info *alloc_domheap_pages(
68 struct domain *d, unsigned int order, unsigned int memflags);
69 struct page_info *__alloc_domheap_pages(
70 struct domain *d, unsigned int cpu, unsigned int order,
71 unsigned int memflags);
72 void free_domheap_pages(struct page_info *pg, unsigned int order);
73 unsigned long avail_domheap_pages(void);
74 unsigned long avail_heap_pages(int zone, int node);
75 #define alloc_domheap_page(d) (alloc_domheap_pages(d,0,0))
76 #define free_domheap_page(p) (free_domheap_pages(p,0))
78 int assign_pages(
79 struct domain *d,
80 struct page_info *pg,
81 unsigned int order,
82 unsigned int memflags);
84 /* memflags: */
85 #define _MEMF_dma 0
86 #define MEMF_dma (1U<<_MEMF_dma)
87 #define _MEMF_no_refcount 1
88 #define MEMF_no_refcount (1U<<_MEMF_no_refcount)
90 #ifdef CONFIG_PAGEALLOC_MAX_ORDER
91 #define MAX_ORDER CONFIG_PAGEALLOC_MAX_ORDER
92 #else
93 #define MAX_ORDER 20 /* 2^20 contiguous pages */
94 #endif
96 /* DMA heap parameters. */
97 extern unsigned int dma_bitsize;
98 extern unsigned long max_dma_mfn;
100 /* Automatic page scrubbing for dead domains. */
101 extern struct list_head page_scrub_list;
102 #define page_scrub_schedule_work() \
103 do { \
104 if ( !list_empty(&page_scrub_list) ) \
105 raise_softirq(PAGE_SCRUB_SOFTIRQ); \
106 } while ( 0 )
107 unsigned long avail_scrub_pages(void);
109 #include <asm/mm.h>
111 int guest_remove_page(struct domain *d, unsigned long gmfn);
113 /* Returns TRUE if the memory at address @p is ordinary RAM. */
114 int memory_is_conventional_ram(paddr_t p);
116 #endif /* __XEN_MM_H__ */