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546 lines
19 KiB
C++
546 lines
19 KiB
C++
/* Copyright (C) 1994-2003 Revolution Software Ltd
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*/
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//memory manager - "remember, it's not good to leave memory locked for a moment longer than necessary" Tony
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// "actually, in a sequential system theoretically you never need to lock any memory!" Chris ;)
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//
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// This is a very simple implementation but I see little advantage to being any cleverer
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// with the coding - i could have put the mem blocks before the defined blocks instead
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// of in an array and then used pointers to child/parent blocks. But why bother? I've Kept it simple.
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// When it needs updating or customising it will be accessable to anyone who looks at it.
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// *doesn't have a purgeable/age consituant yet - if anyone wants this then I'll add it in.
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// MemMan v1.1
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "stdafx.h"
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#include "driver/driver96.h"
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#include "console.h"
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#include "debug.h"
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#include "memory.h"
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#include "resman.h"
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uint32 total_blocks;
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uint32 base_mem_block;
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uint32 total_free_memory;
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uint8 *free_memman; //address of init malloc to be freed later
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//#define MEMDEBUG 1
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mem mem_list[MAX_mem_blocks]; //list of defined memory handles - each representing a block of memory.
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int32 VirtualDefrag( uint32 size ); // Used to determine if the required size can be obtained if the defragger is allowed to run.
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int32 suggestedStart = 0; // Start position of the Defragger as indicated by its sister VirtualDefrag.
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//------------------------------------------------------------------------------------
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//------------------------------------------------------------------------------------
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void Close_memory_manager(void) //Tony2Oct96
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{
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//unlock our supposedly locked in memory
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SVM_VirtualUnlock(free_memman, total_free_memory);
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free(free_memman);
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}
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//------------------------------------------------------------------------------------
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void Init_memory_manager(void) //Tony9April96
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{
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uint32 j;
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uint8 *memory_base;
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//BOOL res;
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SVM_MEMORYSTATUS memo;
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//find out how much actual physical RAM this computer has
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SVM_GlobalMemoryStatus(&memo);
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//now decide how much to grab - 8MB computer are super critical
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if (memo.dwTotalPhys<=(8000*1024)) //if 8MB or less :-O
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total_free_memory=4500*1024; //4.5MB
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else if (memo.dwTotalPhys<=(12000*1024)) //if 8MB or less :-O
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total_free_memory=8000*1024; //8MB
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else if (memo.dwTotalPhys<=(16000*1024)) //if 16MB or less :-)
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total_free_memory=10000*1024; //10MB
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else //:-)) loads of RAM
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total_free_memory=12000*1024; //12MB
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Zdebug("MEM = %d", memo.dwTotalPhys);
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Zdebug("Sword 2 grabbed %dk", total_free_memory/1024);
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//malloc memory and adjust for long boundaries
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memory_base = (uint8 *) malloc(total_free_memory);
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if (!memory_base) //could not grab the memory
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{
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Zdebug("couldn't malloc %d in Init_memory_manager", total_free_memory);
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ExitWithReport("Init_memory_manager() couldn't malloc %d bytes [line=%d file=%s]",total_free_memory,__LINE__,__FILE__);
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}
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free_memman = memory_base; //the original malloc address
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//force to long word boundary
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memory_base+=3;
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memory_base = (uint8 *)((uint32)memory_base & 0xfffffffc); // ** was (int)memory_base
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// total_free_memory-=3; //play safe
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//set all but first handle to unused
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for (j=1;j<MAX_mem_blocks;j++)
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mem_list[j].state=MEM_null;
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total_blocks=1; //total used (free, locked or floating)
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mem_list[0].ad = memory_base;
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mem_list[0].state= MEM_free;
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mem_list[0].age=0;
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mem_list[0].size=total_free_memory;
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mem_list[0].parent=-1; //we are base - for now
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mem_list[0].child=-1; //we are the end as well
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mem_list[0].uid=UID_memman; //init id
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base_mem_block=0; //for now
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//supposedly this will stop the memory swapping out?? Well, as much as we're allowed
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// res=VirtualLock(free_memman, total_free_memory);
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// if (res!=TRUE)
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// Zdebug(" *VirtualLock failed");
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}
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//------------------------------------------------------------------------------------
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mem *Talloc(uint32 size, uint32 type, uint32 unique_id) //Tony10Apr96
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{
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//allocate a block of memory - locked or float
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// returns 0 if fails to allocate the memory
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// or a pointer to a mem structure
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int32 nu_block;
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uint32 spawn=0;
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uint32 slack;
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//we must first round the size UP to a dword, so subsequent blocks will start dword alligned
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size+=3; //move up
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size &= 0xfffffffc; //and back down to boundary
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//find a free block large enough
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if ( (nu_block = Defrag_mem(size))==-1) //the defragger returns when its made a big enough block. This is a good time to defrag as we're probably not
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{ //doing anything super time-critical at the moment
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return(0); //error - couldn't find a big enough space
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}
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//an exact fit?
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if (mem_list[nu_block].size==size) //no new block is required as the fit is perfect
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{
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mem_list[nu_block].state=type; //locked or float
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mem_list[nu_block].size=size; //set to the required size
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mem_list[nu_block].uid=unique_id; //an identifier
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#ifdef MEMDEBUG
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Mem_debug();
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#endif //MEMDEBUG
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return(&mem_list[nu_block]);
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}
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// nu_block is the free block to split, forming our locked/float block with a new free block in any remaining space
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//if our child is free then is can expand downwards to eat up our chopped space
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//this is good because it doesn't create an extra bloc so keeping the block count down
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//why?
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//imagine you Talloc 1000k, then free it. Now keep allocating 10 bytes less and freeing again
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//you end up with thousands of new free mini blocks. this way avoids that as the free child keeps growing downwards
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if ((mem_list[nu_block].child != -1) && (mem_list[mem_list[nu_block].child].state==MEM_free)) //our child is free
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{
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slack=mem_list[nu_block].size-size; //the spare memory is the blocks current size minus the amount we're taking
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mem_list[nu_block].state=type; //locked or float
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mem_list[nu_block].size=size; //set to the required size
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mem_list[nu_block].uid=unique_id; //an identifier
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mem_list[mem_list[nu_block].child].ad = mem_list[nu_block].ad+size; //child starts after us
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mem_list[mem_list[nu_block].child].size += slack; //childs size increases
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return(&mem_list[nu_block]);
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}
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// otherwise we spawn a new block after us and before our child - our child being a proper block that we cannot change
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// we remain a child of our parent
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// we spawn a new child and it inherits our current child
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//find a NULL slot for a new block
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while((mem_list[spawn].state!=MEM_null)&&(spawn!=MAX_mem_blocks))
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spawn++;
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if (spawn==MAX_mem_blocks) //run out of blocks - stop the program. this is a major blow up and we need to alert the developer
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{
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Mem_debug(); //Lets get a printout of this
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ExitWithReport("ERROR: ran out of mem blocks in Talloc() [file=%s line=%u]",__FILE__,__LINE__);
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}
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mem_list[spawn].state=MEM_free; //new block is free
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mem_list[spawn].uid=UID_memman; //a memman created bloc
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mem_list[spawn].size= mem_list[nu_block].size-size; //size of the existing parent free block minus the size of the new space Talloc'ed.
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//IOW the remaining memory is given to the new free block
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mem_list[spawn].ad = mem_list[nu_block].ad+size; //we start 1 byte after the newly allocated block
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mem_list[spawn].parent=nu_block; //the spawned child gets it parent - the newly allocated block
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mem_list[spawn].child=mem_list[nu_block].child; //the new child inherits the parents old child (we are its new child "Waaaa")
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if (mem_list[spawn].child!=-1) //is the spawn the end block?
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mem_list[mem_list[spawn].child].parent= spawn; //the child of the new free-spawn needs to know its new parent
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mem_list[nu_block].state=type; //locked or float
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mem_list[nu_block].size=size; //set to the required size
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mem_list[nu_block].uid=unique_id; //an identifier
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mem_list[nu_block].child=spawn; //the new blocks new child is the newly formed free block
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total_blocks++; //we've brought a new block into the world. Ahhh!
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#ifdef MEMDEBUG
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Mem_debug();
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#endif //MEMDEBUG
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return(&mem_list[nu_block]);
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}
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//------------------------------------------------------------------------------------
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void Free_mem(mem *block) //Tony10Apr96
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{
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//kill a block of memory - which was presumably floating or locked
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//once you've done this the memory may be recycled
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block->state=MEM_free;
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block->uid=UID_memman; //belongs to the memory manager again
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#ifdef MEMDEBUG
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Mem_debug();
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#endif //MEMDEBUG
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}
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//------------------------------------------------------------------------------------
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void Float_mem(mem *block) //Tony10Apr96
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{
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//set a block to float
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//wont be trashed but will move around in memory
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block->state=MEM_float;
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#ifdef MEMDEBUG
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Mem_debug();
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#endif //MEMDEBUG
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}
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//------------------------------------------------------------------------------------
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void Lock_mem(mem *block) //Tony11Apr96
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{
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//set a block to lock
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//wont be moved - don't lock memory for any longer than necessary unless you know the locked memory is at the bottom of the heap
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block->state=MEM_locked; //can't move now - this block is now crying out to be floated or free'd again
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#ifdef MEMDEBUG
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Mem_debug();
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#endif //MEMDEBUG
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}
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//------------------------------------------------------------------------------------
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int32 Defrag_mem(uint32 req_size) //Tony10Apr96
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{
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//moves floating blocks down and/or merges free blocks until a large enough space is found
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//or there is nothing left to do and a big enough block cannot be found
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//we stop when we find/create a large enough block - this is enough defragging.
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int32 cur_block; //block 0 remains the parent block
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int32 original_parent,child, end_child;
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uint32 j;
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uint32 *a;
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uint32 *b;
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// cur_block=base_mem_block; //the mother of all parents
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cur_block = suggestedStart;
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do
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{
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if (mem_list[cur_block].state==MEM_free) //is current block a free block?
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{
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if (mem_list[cur_block].size>=req_size)
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{
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return(cur_block); //this block is big enough - return its id
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}
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if (mem_list[cur_block].child==-1) //the child is the end block - stop if the next block along is the end block
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return(-1); //no luck, couldn't find a big enough block
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// current free block is too small, but if its child is *also* free then merge the two together
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if (mem_list[mem_list[cur_block].child].state==MEM_free)
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{
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// ok, we nuke the child and inherit its child
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child=mem_list[cur_block].child;
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mem_list[cur_block].size+= mem_list[child].size; //our size grows by the size of our child
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mem_list[cur_block].child = mem_list[child].child; //our new child is our old childs, child
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if (mem_list[child].child!=-1) //not if the chld we're nuking is the end child (it has no child)
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mem_list[mem_list[child].child].parent=cur_block; //the (nuked) old childs childs parent is now us
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mem_list[child].state=MEM_null; //clean up the nuked child, so it can be used again
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total_blocks--;
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}
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// current free block is too small, but if its child is a float then we move the floating memory block down and the free up
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// but, parent/child relationships must be such that the memory is all continuous between blocks. ie. a childs memory always
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// begins 1 byte after its parent finishes. However, the positions in the memory list may become truly random, but, any particular
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// block of locked or floating memory must retain its position within the mem_list - the float stays a float because the handle/pointer has been passed back
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// what this means is that when the physical memory of the foat moves down (and the free up) the child becomes the parent and the parent the child
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// but, remember, the parent had a parent and the child another child - these swap over too as the parent/child swap takes place - phew.
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else if (mem_list[mem_list[cur_block].child].state==MEM_float)
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{
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child=mem_list[cur_block].child; //our child is currently floating
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// memcpy(mem_list[cur_block].ad, mem_list[child].ad, mem_list[child].size); //move the higher float down over the free block
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a=(uint32*) mem_list[cur_block].ad;
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b=(uint32*) mem_list[child].ad;
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for (j=0;j<mem_list[child].size/4;j++)
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*(a++)=*(b++);
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// both *ad's change
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mem_list[child].ad = mem_list[cur_block].ad; //the float is now where the free was
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mem_list[cur_block].ad += mem_list[child].size; //and the free goes up by the size of the float (which has come down)
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// the status of the mem_list blocks must remain the same, so...
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original_parent= mem_list[cur_block].parent; //our child gets this when we become its child and it our parent
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mem_list[cur_block].parent=child; //the free's child becomes its parent
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mem_list[cur_block].child= mem_list[child].child; //the new child inherits its previous childs child
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end_child=mem_list[child].child; //save this - see next line
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mem_list[child].child=cur_block; //the floats parent becomes its child
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mem_list[child].parent= original_parent;
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if (end_child!=-1) //if the child had a child
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mem_list[end_child].parent=cur_block; //then its parent is now the new child
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if (original_parent==-1) //the base block was the true base parent
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base_mem_block=child; //then the child that has moved down becomes the base block as it sits at the lowest possible memory location
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else
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mem_list[original_parent].child=child; //otherwise the parent of the current free block - that is now the child - gets a new child,
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//that child being previously the child of the child of the original parent
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}
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else //if (mem_list[mem_list[cur_block].child].state==MEM_lock) //the child of current is locked - move to it
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cur_block=mem_list[cur_block].child; //move to next one along - either locked or END
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}
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else
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{
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cur_block=mem_list[cur_block].child; //move to next one along, the current must be floating, locked, or a NULL slot
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}
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}
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while(cur_block!=-1); //while the block we've just done is not the final block
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return(-1); //no luck, couldn't find a big enough block
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}
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//------------------------------------------------------------------------------------
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void Mem_debug(void) //Tony11Apr96
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{
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//gets called with Talloc, Mem_free, Mem_lock & Mem_float if MEMDEBUG has been #defined
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//otherwise can be called at any time anywhere else
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int j;
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char inf[][20]=
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{
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{"MEM_null"},
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{"MEM_free"},
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{"MEM_locked"},
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{"MEM_float"}
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};
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Zdebug("\nbase %d total %d", base_mem_block, total_blocks);
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//first in mem list order
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for (j=0;j<MAX_mem_blocks;j++)
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{
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if (mem_list[j].state==MEM_null)
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Zdebug("%d- NULL", j);
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else
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Zdebug("%d- state %s, ad %d, size %d, p %d, c %d, id %d", j,
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inf[mem_list[j].state],
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mem_list[j].ad, mem_list[j].size, mem_list[j].parent, mem_list[j].child, mem_list[j].uid);
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}
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//now in child/parent order
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j=base_mem_block;
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do
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{
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Zdebug(" %d- state %s, ad %d, size %d, p %d, c %d", j,
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inf[mem_list[j].state],
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mem_list[j].ad, mem_list[j].size, mem_list[j].parent, mem_list[j].child, mem_list[j].uid);
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j=mem_list[j].child;
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}
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while (j!=-1);
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}
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//------------------------------------------------------------------------------------
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//------------------------------------------------------------------------------------
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//------------------------------------------------------------------------------------
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mem *Twalloc(uint32 size, uint32 type, uint32 unique_id) //tony12Feb97
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{
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//the high level Talloc
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//can ask the resman to remove old resources to make space - will either do it or halt the system
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mem *membloc;
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int j;
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uint32 free=0;
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while( VirtualDefrag(size) )
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{
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if (!res_man.Help_the_aged_out()) //trash the oldest closed resource
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{
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Zdebug("Twalloc ran out of memory! %d %d %d\n", size, type, unique_id);
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ExitWithReport("Twalloc ran out of memory!");
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}
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}
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membloc = Talloc(size, type, unique_id);
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if (membloc == 0)
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{
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Zdebug("Talloc failed to get memory VirtualDefrag said was there");
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ExitWithReport("Talloc failed to get memory VirtualDefrag said was there");
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}
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j=base_mem_block;
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do
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{
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if (mem_list[j].state==MEM_free)
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free+=mem_list[j].size;
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j=mem_list[j].child;
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}
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while (j!=-1);
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return(membloc); //return the pointer to the memory
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}
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#define MAX_WASTAGE 51200 // Maximum allowed wasted memory.
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int32 VirtualDefrag( uint32 size ) // Chris - 07 April '97
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{
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//
|
|
// Virutually defrags memory...
|
|
//
|
|
// Used to determine if there is potentially are large enough free block available is the
|
|
// real defragger was allowed to run.
|
|
//
|
|
// The idea being that Twalloc will call this and help_the_aged_out until we indicate that
|
|
// it is possible to obtain a large enough free block. This way the defragger need only
|
|
// run once to yield the required block size.
|
|
//
|
|
// The reason for its current slowness is that the defragger is potentially called several
|
|
// times, each time shifting upto 20Megs around, to obtain the required free block.
|
|
//
|
|
int32 cur_block;
|
|
uint32 currentBubbleSize = 0;
|
|
|
|
cur_block=base_mem_block;
|
|
suggestedStart = base_mem_block;
|
|
|
|
do
|
|
{
|
|
if (mem_list[cur_block].state == MEM_free)
|
|
{
|
|
// Add a little intelligence. At the start the oldest resources are at the bottom of the
|
|
// tube. However there will be some air at the top. Thus bubbles will be
|
|
// created at the bottom and float to the top. If we ignore the top gap
|
|
// then a large enough bubble will form lower down the tube. Thus less memory
|
|
// will need to be shifted.
|
|
|
|
if (mem_list[cur_block].child != -1)
|
|
currentBubbleSize += mem_list[cur_block].size;
|
|
else if (mem_list[cur_block].size > MAX_WASTAGE)
|
|
currentBubbleSize += mem_list[cur_block].size;
|
|
|
|
if (currentBubbleSize >= size)
|
|
return 0;
|
|
}
|
|
else if (mem_list[cur_block].state == MEM_locked)
|
|
{
|
|
currentBubbleSize = 0;
|
|
suggestedStart = mem_list[cur_block].child; // Any free block of the correct size will be above this locked block.
|
|
}
|
|
|
|
cur_block = mem_list[cur_block].child;
|
|
}
|
|
while(cur_block != -1);
|
|
|
|
return(1);
|
|
}
|
|
|
|
//------------------------------------------------------------------------------------
|
|
//------------------------------------------------------------------------------------
|
|
//------------------------------------------------------------------------------------
|
|
//------------------------------------------------------------------------------------
|
|
//------------------------------------------------------------------------------------
|