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New memory functions

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@166
This commit is contained in:
Sjoerd van der Berg 2002-08-19 12:48:43 +00:00
parent 44c3361387
commit e23e1d61ce
1 changed files with 12 additions and 12 deletions
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24
src/dos/dos_memory.cpp
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@ -29,15 +29,15 @@ static void DOS_CompressMemory(void) {
MCB * pmcb;MCB * pmcbnext;
Bit16u mcb_segment;
mcb_segment=dos.firstMCB;
pmcb=(MCB *)real_off(mcb_segment,0);
pmcb=(MCB *)HostMake(mcb_segment,0);
while (pmcb->type!=0x5a) {
pmcbnext=pmcbnext=(MCB *)real_off(mcb_segment+pmcb->size+1,0);
pmcbnext=pmcbnext=(MCB *)HostMake(mcb_segment+pmcb->size+1,0);
if ((pmcb->psp_segment==0) && (pmcbnext->psp_segment==0)) {
pmcb->size+=pmcbnext->size+1;
pmcb->type=pmcbnext->type;
} else {
mcb_segment+=pmcb->size+1;
pmcb=(MCB *)real_off(mcb_segment,0);
pmcb=(MCB *)HostMake(mcb_segment,0);
}
}
}
@ -45,14 +45,14 @@ static void DOS_CompressMemory(void) {
void DOS_FreeProcessMemory(Bit16u pspseg) {
MCB * pmcb;
Bit16u mcb_segment=dos.firstMCB;
pmcb=(MCB *)real_off(mcb_segment,0);
pmcb=(MCB *)HostMake(mcb_segment,0);
while (true) {
if (pmcb->psp_segment==pspseg) {
pmcb->psp_segment=MCB_FREE;
}
mcb_segment+=pmcb->size+1;
if (pmcb->type==0x5a) break;
pmcb=(MCB *)real_off(mcb_segment,0);
pmcb=(MCB *)HostMake(mcb_segment,0);
}
DOS_CompressMemory();
};
@ -64,7 +64,7 @@ bool DOS_AllocateMemory(Bit16u * segment,Bit16u * blocks) {
bool stop=false;mcb_segment=dos.firstMCB;
DOS_CompressMemory();
while(!stop) {
pmcb=(MCB *)real_off(mcb_segment,0);
pmcb=(MCB *)HostMake(mcb_segment,0);
if (pmcb->psp_segment==0) {
/* Check for enough free memory in current block */
if (pmcb->size<(*blocks)) {
@ -78,7 +78,7 @@ bool DOS_AllocateMemory(Bit16u * segment,Bit16u * blocks) {
return true;
} else {
/* If so allocate it */
pmcbnext=(MCB *)real_off(mcb_segment+*blocks+1,0);
pmcbnext=(MCB *)HostMake(mcb_segment+*blocks+1,0);
pmcbnext->psp_segment=MCB_FREE;
pmcbnext->type=pmcb->type;
pmcbnext->size=pmcb->size-*blocks-1;
@ -105,8 +105,8 @@ bool DOS_AllocateMemory(Bit16u * segment,Bit16u * blocks) {
bool DOS_ResizeMemory(Bit16u segment,Bit16u * blocks) {
DOS_CompressMemory();
MCB * pmcb,* pmcbnext,* pmcbnew;
pmcb=(MCB *)real_off(segment-1,0);
pmcbnext=(MCB *)real_off(segment+pmcb->size,0);
pmcb=(MCB *)HostMake(segment-1,0);
pmcbnext=(MCB *)HostMake(segment+pmcb->size,0);
Bit16u total=pmcb->size;
if (pmcb->type!=0x5a) {
if (pmcbnext->psp_segment==MCB_FREE) {
@ -118,7 +118,7 @@ bool DOS_ResizeMemory(Bit16u segment,Bit16u * blocks) {
pmcb->type=pmcbnext->type;
}
pmcb->size=*blocks;
pmcbnew=(MCB *)real_off(segment+*blocks,0);
pmcbnew=(MCB *)HostMake(segment+*blocks,0);
pmcbnew->size=total-*blocks-1;
pmcbnew->type=pmcb->type;
pmcbnew->psp_segment=MCB_FREE;
@ -141,7 +141,7 @@ bool DOS_ResizeMemory(Bit16u segment,Bit16u * blocks) {
bool DOS_FreeMemory(Bit16u segment) {
//TODO Check if allowed to free this segment
MCB * pmcb;
pmcb=(MCB *)real_off(segment-1,0);
pmcb=(MCB *)HostMake(segment-1,0);
pmcb->psp_segment=MCB_FREE;
DOS_CompressMemory();
return true;
@ -153,7 +153,7 @@ bool DOS_FreeMemory(Bit16u segment) {
void DOS_SetupMemory(void) {
//TODO Maybe allocate some memory for dos transfer buffers
//Although i could use bios regions for that for max free low memory
MCB * mcb=(MCB *) real_off(MEM_START,0);
MCB * mcb=(MCB *) HostMake(MEM_START,0);
mcb->psp_segment=MCB_FREE; //Free
mcb->size=0x9FFE - MEM_START;
mcb->type=0x5a; //Last Block