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memory.i
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1991-11-27
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98 lines
IFND EXEC_MEMORY_I
EXEC_MEMORY_I SET 1
**
** $Filename: exec/memory.i $
** $Release: 2.04 Includes, V37.4 $
** $Revision: 36.11 $
** $Date: 91/03/15 $
**
** Definitions and structures used by the memory allocation system
**
** (C) Copyright 1985-1991 Commodore-Amiga, Inc.
** All Rights Reserved
**
IFND EXEC_NODES_I
INCLUDE "exec/nodes.i"
ENDC ; EXEC_NODES_I
*---------------------------------------------------------------------
*
* Memory List Structures
*
*---------------------------------------------------------------------
*
* A memory list appears in two forms: One is a requirements list
* the other is a list of already allocated memory. The format is
* the same, with the reqirements/address field occupying the same
* position.
*
* The format is a linked list of ML structures each of which has
* an array of ME entries.
*
*---------------------------------------------------------------------
STRUCTURE ML,LN_SIZE
UWORD ML_NUMENTRIES ; The number of ME structures that follow
LABEL ML_ME ; where the ME structures begin
LABEL ML_SIZE ;Note: does NOT include any "ME" structures.
STRUCTURE ME,0
LABEL ME_REQS ; the AllocMem requirements
APTR ME_ADDR ; the address of this block (an alias
; for the same location as ME_REQS)
ULONG ME_LENGTH ; the length of this region
LABEL ME_SIZE
*------ memory options:
*------ see the AllocMem() documentation for details------*
MEMF_ANY EQU 0 ;Any type of memory will do
BITDEF MEM,PUBLIC,0
BITDEF MEM,CHIP,1
BITDEF MEM,FAST,2
BITDEF MEM,LOCAL,8 ;Memory that does not go away at RESET
BITDEF MEM,24BITDMA,9 ;DMAable memory within 24 bits of address
BITDEF MEM,CLEAR,16 ;AllocMem: NULL out area before return
BITDEF MEM,LARGEST,17 ;AvailMem: return the largest chunk size
BITDEF MEM,REVERSE,18 ;AllocMem: allocate from the top down
BITDEF MEM,TOTAL,19 ;AvailMem: return total size of memory
*----- Current alignment rules for memory blocks (may increase) -----
MEM_BLOCKSIZE EQU 8
MEM_BLOCKMASK EQU (MEM_BLOCKSIZE-1)
*---------------------------------------------------------------------
*
* Memory Region Header
*
*---------------------------------------------------------------------
STRUCTURE MH,LN_SIZE ; (LN_TYPE will be set to NT_MEMORY)
UWORD MH_ATTRIBUTES ; characteristics of this region
APTR MH_FIRST ; first free region
APTR MH_LOWER ; lower memory bound
APTR MH_UPPER ; upper memory bound+1
ULONG MH_FREE ; number of free bytes
LABEL MH_SIZE
*---------------------------------------------------------------------
*
* Memory Chunk
*
*---------------------------------------------------------------------
STRUCTURE MC,0
APTR MC_NEXT ; ptr to next chunk
ULONG MC_BYTES ; chunk byte size
APTR MC_SIZE
ENDC ; EXEC_MEMORY_I