178 lines
3.5 KiB
Plaintext
178 lines
3.5 KiB
Plaintext
/*++
|
|
|
|
Copyright (c) 1992 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
suballcp.h
|
|
|
|
Abstract:
|
|
|
|
This is the private include file for the suballocation
|
|
package.
|
|
|
|
Author:
|
|
|
|
Dave Hastings (daveh) creation-date 25-Jan-1994
|
|
|
|
Revision History:
|
|
|
|
|
|
--*/
|
|
#include <nt.h>
|
|
#include <ntrtl.h>
|
|
#include <nturtl.h>
|
|
#include <windows.h>
|
|
#include <malloc.h>
|
|
#include <suballoc.h>
|
|
|
|
|
|
//
|
|
// Constants
|
|
//
|
|
|
|
//
|
|
// Smallest chunk that will be sub allocated
|
|
// 1024 was chosen currently, because that is the
|
|
// smallest chunk XMS will allocate.
|
|
//
|
|
#define SUBALLOC_GRANULARITY 1024
|
|
|
|
//
|
|
// Assertions and macros
|
|
//
|
|
|
|
//
|
|
// Force code to be stepped through
|
|
//
|
|
#if 0
|
|
#define ASSERT_STEPTHROUGH DbgBreakPoint()
|
|
#else
|
|
#define ASSERT_STEPTHROUGH
|
|
#endif
|
|
|
|
//
|
|
// Signature macros for SUBALLOCATION
|
|
//
|
|
#if DBG
|
|
//
|
|
// signature is "SubA"
|
|
//
|
|
#define INIT_SUBALLOC_SIGNATURE(p) p->Signature = (ULONG)0x41627553
|
|
#define ASSERT_SUBALLOC(p) ASSERT((p->Signature == (ULONG)0x41627553))
|
|
#else
|
|
#define INIT_SUBALLOC_SIGNATURE(p)
|
|
#define ASSERT_SUBALLOC(p)
|
|
#endif
|
|
|
|
//
|
|
// Macro for extracting a bit from a bitfield of type char
|
|
//
|
|
#define GET_BIT_FROM_CHAR_ARRAY(p, i) \
|
|
((p[i/(sizeof(UCHAR) * 8)] >> (i % (sizeof(UCHAR) * 8))) & 1)
|
|
|
|
//
|
|
// Macro for setting a bit in a bitfield of type char
|
|
//
|
|
#define SET_BIT_IN_CHAR_ARRAY(p, i) \
|
|
(p[i/(sizeof(UCHAR) * 8)] |= (1 << (i % (sizeof(UCHAR) * 8))))
|
|
|
|
//
|
|
// Macro for clearing a bit in a bitfield of type char
|
|
//
|
|
#define CLEAR_BIT_IN_CHAR_ARRAY(p, i) \
|
|
(p[i/(sizeof(UCHAR) * 8)] &= ~(1 << (i % (sizeof(UCHAR) * 8))))
|
|
|
|
//
|
|
// Generate a sub alloc block index from an address
|
|
//
|
|
#define ADDRESS_TO_BLOCK_INDEX(p, i) \
|
|
((i - p->BaseAddress)/ SUBALLOC_GRANULARITY)
|
|
|
|
//
|
|
// Generate an address from a block index
|
|
//
|
|
#define BLOCK_INDEX_TO_ADDRESS(p, i) \
|
|
(p->BaseAddress + i * SUBALLOC_GRANULARITY)
|
|
|
|
// Round the allocated size to next allocation
|
|
// granularity
|
|
//
|
|
#define ALLOC_ROUND(s) \
|
|
(s + SUBALLOC_GRANULARITY - 1) / SUBALLOC_GRANULARITY
|
|
|
|
//
|
|
// Types
|
|
//
|
|
|
|
//
|
|
// Enum for commit acctions
|
|
//
|
|
|
|
typedef enum {
|
|
SACommit,
|
|
SADecommit
|
|
} COMMIT_ACTION;
|
|
|
|
//
|
|
// Structure for tracking the address space. Each chunk of
|
|
// memory of SUBALLOC_GRANULARITY in size is represented by
|
|
// a bit. Each chunk of memory of COMMIT_GRANULARITY is
|
|
// represented by one bit of the array Allocated.
|
|
//
|
|
// ?? Should we add a field to indicate whether the chunk is
|
|
// committed? We can always check for all allocated bits
|
|
// zero, and use that as an indication that the chunk is
|
|
// not committed.
|
|
//
|
|
//
|
|
typedef struct _SubAllocation {
|
|
#if DBG
|
|
ULONG Signature;
|
|
#endif
|
|
PSACOMMITROUTINE CommitRoutine;
|
|
PSACOMMITROUTINE DecommitRoutine;
|
|
PSAMEMORYMOVEROUTINE MoveMemRoutine;
|
|
ULONG BaseAddress;
|
|
ULONG Size; // size in SUBALLOC_GRANULARITY
|
|
ULONG FirstFree; // keeps block # of first free block
|
|
// cuts alloc time in half
|
|
//
|
|
// bitfield with one bit per chunk. Bit set indicates
|
|
// allocated. Bit clear indicates free. All bits
|
|
// clear indicates un committed
|
|
//
|
|
UCHAR Allocated[1];
|
|
} SUBALLOCATIONDATA, *PSUBALLOCATIONDATA;
|
|
|
|
//
|
|
// Internal Routines
|
|
//
|
|
BOOL
|
|
CommitChunk(
|
|
PSUBALLOCATIONDATA SubAllocation,
|
|
ULONG StartChunk,
|
|
ULONG Size,
|
|
COMMIT_ACTION Action
|
|
);
|
|
|
|
BOOL
|
|
IsBlockCommitted(
|
|
PSUBALLOCATIONDATA SubAlloc,
|
|
ULONG CurrentBlock
|
|
);
|
|
|
|
BOOL
|
|
AllocateChunkAt(
|
|
PSUBALLOCATIONDATA SubAlloc,
|
|
ULONG Size,
|
|
ULONG BlockIndex
|
|
);
|
|
|
|
BOOL
|
|
FreeChunk(
|
|
PSUBALLOCATIONDATA SubAlloc,
|
|
ULONG Size,
|
|
ULONG BlockIndex
|
|
);
|