ia64/xen-unstable

annotate 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
rev   line source
kaf24@8726 1 /******************************************************************************
kaf24@8726 2 * include/xen/mm.h
kaf24@8726 3 *
kaf24@8726 4 * Definitions for memory pages, frame numbers, addresses, allocations, etc.
kaf24@8726 5 *
kaf24@8726 6 * Note that Xen must handle several different physical 'address spaces' and
kaf24@8726 7 * there is a consistent terminology for these:
kaf24@8726 8 *
kaf24@8726 9 * 1. gpfn/gpaddr: A guest-specific pseudo-physical frame number or address.
kaf24@8726 10 * 2. gmfn/gmaddr: A machine address from the p.o.v. of a particular guest.
kaf24@8726 11 * 3. mfn/maddr: A real machine frame number or address.
kaf24@8726 12 * 4. pfn/paddr: Used in 'polymorphic' functions that work across all
kaf24@8726 13 * address spaces, depending on context. See the pagetable
kaf24@8726 14 * conversion macros in asm-x86/page.h for examples.
kaf24@8726 15 * Also 'paddr_t' is big enough to store any physical address.
kaf24@8726 16 *
kaf24@8726 17 * This scheme provides consistent function and variable names even when
kaf24@8726 18 * different guests are running in different memory-management modes.
kaf24@8726 19 * 1. A guest running in auto-translated mode (e.g., shadow_mode_translate())
kaf24@8726 20 * will have gpfn == gmfn and gmfn != mfn.
kaf24@8726 21 * 2. A paravirtualised x86 guest will have gpfn != gmfn and gmfn == mfn.
kaf24@8726 22 * 3. A paravirtualised guest with no pseudophysical overlay will have
kaf24@8726 23 * gpfn == gpmfn == mfn.
kaf24@8726 24 *
kaf24@8726 25 * Copyright (c) 2002-2006, K A Fraser <keir@xensource.com>
kaf24@8726 26 */
kaf24@1210 27
kaf24@1211 28 #ifndef __XEN_MM_H__
kaf24@1211 29 #define __XEN_MM_H__
kaf24@1210 30
kaf24@4267 31 #include <xen/config.h>
kaf24@5398 32 #include <xen/types.h>
kaf24@4267 33 #include <xen/list.h>
kaf24@4267 34 #include <xen/spinlock.h>
kaf24@4267 35
kaf24@1941 36 struct domain;
kaf24@8726 37 struct page_info;
kaf24@1936 38
kaf24@3354 39 /* Boot-time allocator. Turns into generic allocator after bootstrap. */
kaf24@8726 40 paddr_t init_boot_allocator(paddr_t bitmap_start);
kaf24@8726 41 void init_boot_pages(paddr_t ps, paddr_t pe);
kfraser@14083 42 unsigned long alloc_boot_pages(
kfraser@14083 43 unsigned long nr_pfns, unsigned long pfn_align);
kfraser@14083 44 unsigned long alloc_boot_low_pages(
kfraser@14083 45 unsigned long nr_pfns, unsigned long pfn_align);
kfraser@14083 46 int reserve_boot_pages(unsigned long first_pfn, unsigned long nr_pfns);
kaf24@3354 47 void end_boot_allocator(void);
kaf24@3354 48
kaf24@2806 49 /* Generic allocator. These functions are *not* interrupt-safe. */
kaf24@3461 50 void init_heap_pages(
kaf24@8726 51 unsigned int zone, struct page_info *pg, unsigned long nr_pages);
kfraser@11972 52 struct page_info *alloc_heap_pages(
kfraser@11972 53 unsigned int zone, unsigned int cpu, unsigned int order);
kaf24@3461 54 void free_heap_pages(
kaf24@8726 55 unsigned int zone, struct page_info *pg, unsigned int order);
kaf24@2772 56 void scrub_heap_pages(void);
kaf24@1936 57
kaf24@2806 58 /* Xen suballocator. These functions are interrupt-safe. */
kaf24@8726 59 void init_xenheap_pages(paddr_t ps, paddr_t pe);
kaf24@5398 60 void *alloc_xenheap_pages(unsigned int order);
kaf24@5398 61 void free_xenheap_pages(void *v, unsigned int order);
kaf24@1920 62 #define alloc_xenheap_page() (alloc_xenheap_pages(0))
kaf24@5398 63 #define free_xenheap_page(v) (free_xenheap_pages(v,0))
kaf24@1749 64
kaf24@2806 65 /* Domain suballocator. These functions are *not* interrupt-safe.*/
kaf24@8726 66 void init_domheap_pages(paddr_t ps, paddr_t pe);
kaf24@8726 67 struct page_info *alloc_domheap_pages(
kfraser@10418 68 struct domain *d, unsigned int order, unsigned int memflags);
kfraser@11972 69 struct page_info *__alloc_domheap_pages(
kfraser@11972 70 struct domain *d, unsigned int cpu, unsigned int order,
kfraser@11972 71 unsigned int memflags);
kaf24@8726 72 void free_domheap_pages(struct page_info *pg, unsigned int order);
kaf24@1936 73 unsigned long avail_domheap_pages(void);
kfraser@11972 74 unsigned long avail_heap_pages(int zone, int node);
kaf24@5929 75 #define alloc_domheap_page(d) (alloc_domheap_pages(d,0,0))
kaf24@5398 76 #define free_domheap_page(p) (free_domheap_pages(p,0))
kaf24@1210 77
kfraser@10418 78 int assign_pages(
kfraser@10418 79 struct domain *d,
kfraser@10418 80 struct page_info *pg,
kfraser@10418 81 unsigned int order,
kfraser@10418 82 unsigned int memflags);
kfraser@10418 83
kfraser@10418 84 /* memflags: */
kfraser@10418 85 #define _MEMF_dma 0
kfraser@10418 86 #define MEMF_dma (1U<<_MEMF_dma)
kfraser@10418 87 #define _MEMF_no_refcount 1
kfraser@10418 88 #define MEMF_no_refcount (1U<<_MEMF_no_refcount)
kaf24@5929 89
kaf24@10340 90 #ifdef CONFIG_PAGEALLOC_MAX_ORDER
kaf24@10340 91 #define MAX_ORDER CONFIG_PAGEALLOC_MAX_ORDER
kaf24@10340 92 #else
kaf24@10341 93 #define MAX_ORDER 20 /* 2^20 contiguous pages */
kaf24@10340 94 #endif
kaf24@9456 95
kfraser@12641 96 /* DMA heap parameters. */
kfraser@12641 97 extern unsigned int dma_bitsize;
kfraser@12641 98 extern unsigned long max_dma_mfn;
kfraser@12641 99
kaf24@4267 100 /* Automatic page scrubbing for dead domains. */
kaf24@4267 101 extern struct list_head page_scrub_list;
kaf24@4267 102 #define page_scrub_schedule_work() \
kaf24@4267 103 do { \
kaf24@4267 104 if ( !list_empty(&page_scrub_list) ) \
kaf24@4267 105 raise_softirq(PAGE_SCRUB_SOFTIRQ); \
kaf24@4267 106 } while ( 0 )
kaf24@10541 107 unsigned long avail_scrub_pages(void);
kaf24@4267 108
kaf24@1941 109 #include <asm/mm.h>
kaf24@1941 110
cl349@9211 111 int guest_remove_page(struct domain *d, unsigned long gmfn);
cl349@9211 112
kfraser@11177 113 /* Returns TRUE if the memory at address @p is ordinary RAM. */
kfraser@11177 114 int memory_is_conventional_ram(paddr_t p);
kfraser@11177 115
kaf24@1211 116 #endif /* __XEN_MM_H__ */