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|
/* $Id: buffers.c,v 1.2 1996/07/04 22:46:20 dm Exp $
*
* $Log: buffers.c,v $
* Revision 1.2 1996/07/04 22:46:20 dm
* Merge to 2.0.1
*
* Revision 1.3 1996/05/31 00:56:53 fritz
* removed cli() from BufPoolAdd, since it is called
* with interrupts off anyway.
*
* Revision 1.2 1996/04/29 22:48:14 fritz
* Removed compatibility-macros. No longer needed.
*
* Revision 1.1 1996/04/13 10:19:28 fritz
* Initial revision
*
*
*/
#define __NO_VERSION__
#include "teles.h"
#include <linux/mm.h>
#include <linux/malloc.h>
void
BufPoolInit(struct BufPool *bp, int order, int bpps,
int maxpages)
{
#ifdef DEBUG_MAGIC
generateerror
bp->magic = 010167;
#endif
#if 0
printk(KERN_DEBUG "BufPoolInit bp %x\n", bp);
#endif
bp->freelist = NULL;
bp->pageslist = NULL;
bp->pageorder = order;
bp->pagescount = 0;
bp->bpps = bpps;
bp->bufsize = BUFFER_SIZE(order, bpps);
bp->maxpages = maxpages;
}
int
BufPoolAdd(struct BufPool *bp, int priority)
{
struct Pages *ptr;
byte *bptr;
int i;
struct BufHeader *bh = NULL, *prev, *first;
#if 0
printk(KERN_DEBUG "BufPoolAdd bp %x\n", bp);
#endif
ptr = (struct Pages *) __get_free_pages(priority, bp->pageorder, 0);
if (!ptr) {
printk(KERN_WARNING "BufPoolAdd couldn't get pages!\n");
return (-1);
}
#if 0
printk(KERN_DEBUG "Order %d pages allocated at %x\n", bp->pageorder, ptr);
#endif
ptr->next = bp->pageslist;
bp->pageslist = ptr;
bp->pagescount++;
bptr = (byte *) ptr + sizeof(struct Pages *);
i = bp->bpps;
first = (struct BufHeader *) bptr;
prev = NULL;
while (i--) {
bh = (struct BufHeader *) bptr;
#ifdef DEBUG_MAGIC
bh->magic = 020167;
#endif
bh->next = prev;
prev = bh;
bh->bp = bp;
bptr += PART_SIZE(bp->pageorder, bp->bpps);
}
first->next = bp->freelist;
bp->freelist = bh;
return (0);
}
void
BufPoolFree(struct BufPool *bp)
{
struct Pages *p;
#if 0
printk(KERN_DEBUG "BufPoolFree bp %x\n", bp);
#endif
while (bp->pagescount--) {
p = bp->pageslist->next;
free_pages((unsigned long) bp->pageslist, bp->pageorder);
#if 0
printk(KERN_DEBUG "Free pages %x order %d\n", bp->pageslist, bp->pageorder);
#endif
bp->pageslist = p;
}
}
int
BufPoolGet(struct BufHeader **bh,
struct BufPool *bp, int priority, void *heldby, int where)
{
long flags;
int i;
#ifdef DEBUG_MAGIC
if (bp->magic != 010167) {
printk(KERN_DEBUG "BufPoolGet: not a BufHeader\n");
return (-1);
}
#endif
save_flags(flags);
cli();
i = 0;
while (!0) {
if (bp->freelist) {
*bh = bp->freelist;
bp->freelist = bp->freelist->next;
(*bh)->heldby = heldby;
(*bh)->where = where;
restore_flags(flags);
return (0);
}
if ((i == 0) && (bp->pagescount < bp->maxpages)) {
if (BufPoolAdd(bp, priority)) {
restore_flags(flags);
return -1;
}
i++;
} else {
*bh = NULL;
restore_flags(flags);
return (-1);
}
}
}
void
BufPoolRelease(struct BufHeader *bh)
{
struct BufPool *bp;
long flags;
#ifdef DEBUG_MAGIC
if (bh->magic != 020167) {
printk(KERN_DEBUG "BufPoolRelease: not a BufHeader\n");
printk(KERN_DEBUG "called from %x\n", return_address());
return;
}
#endif
bp = bh->bp;
#ifdef DEBUG_MAGIC
if (bp->magic != 010167) {
printk(KERN_DEBUG "BufPoolRelease: not a BufPool\n");
return;
}
#endif
save_flags(flags);
cli();
bh->next = bp->freelist;
bp->freelist = bh;
restore_flags(flags);
}
void
BufQueueLink(struct BufQueue *bq,
struct BufHeader *bh)
{
unsigned long flags;
save_flags(flags);
cli();
if (!bq->head)
bq->head = bh;
if (bq->tail)
bq->tail->next = bh;
bq->tail = bh;
bh->next = NULL;
restore_flags(flags);
}
void
BufQueueLinkFront(struct BufQueue *bq,
struct BufHeader *bh)
{
unsigned long flags;
save_flags(flags);
cli();
bh->next = bq->head;
bq->head = bh;
if (!bq->tail)
bq->tail = bh;
restore_flags(flags);
}
int
BufQueueUnlink(struct BufHeader **bh, struct BufQueue *bq)
{
long flags;
save_flags(flags);
cli();
if (bq->head) {
if (bq->tail == bq->head)
bq->tail = NULL;
*bh = bq->head;
bq->head = (*bh)->next;
restore_flags(flags);
return (0);
} else {
restore_flags(flags);
return (-1);
}
}
void
BufQueueInit(struct BufQueue *bq)
{
#ifdef DEBUG_MAGIC
bq->magic = 030167;
#endif
bq->head = NULL;
bq->tail = NULL;
}
void
BufQueueRelease(struct BufQueue *bq)
{
struct BufHeader *bh;
while (bq->head) {
BufQueueUnlink(&bh, bq);
BufPoolRelease(bh);
}
}
int
BufQueueLength(struct BufQueue *bq)
{
int i = 0;
struct BufHeader *bh;
bh = bq->head;
while (bh) {
i++;
bh = bh->next;
}
return (i);
}
void
BufQueueDiscard(struct BufQueue *q, int pr, void *heldby,
int releasetoo)
{
long flags;
struct BufHeader *sp;
save_flags(flags);
cli();
while (!0) {
sp = q->head;
if (!sp)
break;
if ((sp->primitive == pr) && (sp->heldby == heldby)) {
q->head = sp->next;
if (q->tail == sp)
q->tail = NULL;
if (releasetoo)
BufPoolRelease(sp);
} else
break;
}
sp = q->head;
if (sp)
while (sp->next) {
if ((sp->next->primitive == pr) && (sp->next->heldby == heldby)) {
if (q->tail == sp->next)
q->tail = sp;
if (releasetoo)
BufPoolRelease(sp->next);
sp->next = sp->next->next;
} else
sp = sp->next;
}
restore_flags(flags);
}
void
Sfree(byte * ptr)
{
#if 0
printk(KERN_DEBUG "Sfree %x\n", ptr);
#endif
kfree(ptr);
}
byte *
Smalloc(int size, int pr, char *why)
{
byte *p;
p = (byte *) kmalloc(size, pr);
#if 0
printk(KERN_DEBUG "Smalloc %s size %d res %x\n", why, size, p);
#endif
return (p);
}
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