3 * Copyright (C) 1998-2003 Brian Palmer <brianp@sginet.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #define MEMTYPE_USABLE 0x01
26 #define MEMTYPE_RESERVED 0x02
27 #define MEMTYPE_ACPI_RECLAIM 0x03
28 #define MEMTYPE_ACPI_NVS 0x04
32 ULONGLONG BaseAddress
;
36 } PACKED BIOS_MEMORY_MAP
, *PBIOS_MEMORY_MAP
;
38 #if defined(__i386__) || defined(_PPC_)
40 #define MM_PAGE_SIZE 4096
41 #define MM_PAGE_MASK 0xFFF
42 #define MM_PAGE_SHIFT 12
44 #define MM_SIZE_TO_PAGES(a) \
45 ( ((a) >> MM_PAGE_SHIFT) + ((a) & MM_PAGE_MASK ? 1 : 0) )
47 #endif // defined __i386__ or _PPC_
51 ULONG PageAllocated
; // Zero = free, non-zero = allocated
52 ULONG PageAllocationLength
; // Number of pages allocated (or zero if this isn't the first page in the chain)
53 } PACKED PAGE_LOOKUP_TABLE_ITEM
, *PPAGE_LOOKUP_TABLE_ITEM
;
56 // Define this to 1 if you want the entire contents
57 // of the memory allocation bitmap displayed
58 // when a chunk is allocated or freed
60 #define DUMP_MEM_MAP_ON_VERIFY 0
64 extern PVOID PageLookupTableAddress
;
65 extern ULONG TotalPagesInLookupTable
;
66 extern ULONG FreePagesInLookupTable
;
67 extern ULONG LastFreePageHint
;
70 PUCHAR
MmGetSystemMemoryMapTypeString(ULONG Type
);
73 ULONG
MmGetPageNumberFromAddress(PVOID Address
); // Returns the page number that contains a linear address
74 PVOID
MmGetEndAddressOfAnyMemory(PBIOS_MEMORY_MAP BiosMemoryMap
, ULONG MapCount
); // Returns the last address of memory from the memory map
75 ULONG
MmGetAddressablePageCountIncludingHoles(PBIOS_MEMORY_MAP BiosMemoryMap
, ULONG MapCount
); // Returns the count of addressable pages from address zero including any memory holes and reserved memory regions
76 PVOID
MmFindLocationForPageLookupTable(PBIOS_MEMORY_MAP BiosMemoryMap
, ULONG MapCount
); // Returns the address for a memory chunk big enough to hold the page lookup table (starts search from end of memory)
77 VOID
MmSortBiosMemoryMap(PBIOS_MEMORY_MAP BiosMemoryMap
, ULONG MapCount
); // Sorts the BIOS_MEMORY_MAP array so the first element corresponds to the first address in memory
78 VOID
MmInitPageLookupTable(PVOID PageLookupTable
, ULONG TotalPageCount
, PBIOS_MEMORY_MAP BiosMemoryMap
, ULONG MapCount
); // Inits the page lookup table according to the memory types in the memory map
79 VOID
MmMarkPagesInLookupTable(PVOID PageLookupTable
, ULONG StartPage
, ULONG PageCount
, ULONG PageAllocated
); // Marks the specified pages as allocated or free in the lookup table
80 VOID
MmAllocatePagesInLookupTable(PVOID PageLookupTable
, ULONG StartPage
, ULONG PageCount
); // Allocates the specified pages in the lookup table
81 ULONG
MmCountFreePagesInLookupTable(PVOID PageLookupTable
, ULONG TotalPageCount
); // Returns the number of free pages in the lookup table
82 ULONG
MmFindAvailablePages(PVOID PageLookupTable
, ULONG TotalPageCount
, ULONG PagesNeeded
, BOOLEAN FromEnd
); // Returns the page number of the first available page range from the beginning or end of memory
83 ULONG
MmFindAvailablePagesBeforePage(PVOID PageLookupTable
, ULONG TotalPageCount
, ULONG PagesNeeded
, ULONG LastPage
); // Returns the page number of the first available page range before the specified page
84 VOID
MmFixupSystemMemoryMap(PBIOS_MEMORY_MAP BiosMemoryMap
, ULONG
* MapCount
); // Removes entries in the memory map that describe memory above 4G
85 VOID
MmUpdateLastFreePageHint(PVOID PageLookupTable
, ULONG TotalPageCount
); // Sets the LastFreePageHint to the last usable page of memory
86 BOOLEAN
MmAreMemoryPagesAvailable(PVOID PageLookupTable
, ULONG TotalPageCount
, PVOID PageAddress
, ULONG PageCount
); // Returns TRUE if the specified pages of memory are available, otherwise FALSE
88 ULONG
GetSystemMemorySize(VOID
); // Returns the amount of total memory in the system
89 PPAGE_LOOKUP_TABLE_ITEM
MmGetMemoryMap(ULONG
*NoEntries
); // Returns a pointer to the memory mapping table and a number of entries in it
92 //BOOLEAN MmInitializeMemoryManager(ULONG LowMemoryStart, ULONG LowMemoryLength);
93 BOOLEAN
MmInitializeMemoryManager(VOID
);
94 PVOID
MmAllocateMemory(ULONG MemorySize
);
95 VOID
MmFreeMemory(PVOID MemoryPointer
);
96 VOID
MmChangeAllocationPolicy(BOOLEAN PolicyAllocatePagesFromEnd
);
97 //PVOID MmAllocateLowMemory(ULONG MemorySize);
98 //VOID MmFreeLowMemory(PVOID MemoryPointer);
99 PVOID
MmAllocateMemoryAtAddress(ULONG MemorySize
, PVOID DesiredAddress
);
100 PVOID
MmAllocateHighestMemoryBelowAddress(ULONG MemorySize
, PVOID DesiredAddress
);
102 #endif // defined __MEMORY_H