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WebSVN – planix.SVN – Blame – /os/branches/feature_posix/sys/src/9/port/ucallocb.c – Rev 2

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/*
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 * allocate Blocks from uncached memory
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 */
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#include	"u.h"
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#include	"../port/lib.h"
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#include	"mem.h"
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#include	"dat.h"
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#include	"fns.h"
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#include	"error.h"
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enum
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{
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	Hdrspc		= 64,		/* leave room for high-level headers */
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	Bdead		= 0x51494F42,	/* "QIOB" */
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};
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struct
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{
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	Lock;
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	ulong	bytes;
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} ucialloc;
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static Block*
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_ucallocb(int size)
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{
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	Block *b;
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	ulong addr;
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	if((b = ucalloc(sizeof(Block)+size+Hdrspc)) == nil)
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		return nil;
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	b->next = nil;
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	b->list = nil;
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	b->free = 0;
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	b->flag = 0;
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	b->ref = 0;
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	_xinc(&b->ref);
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	/* align start of data portion by rounding up */
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	addr = (ulong)b;
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	addr = ROUND(addr + sizeof(Block), BLOCKALIGN);
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	b->base = (uchar*)addr;
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	/* align end of data portion by rounding down */
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	b->lim = ((uchar*)b) + msize(b);
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	addr = (ulong)(b->lim);
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	addr = addr & ~(BLOCKALIGN-1);
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	b->lim = (uchar*)addr;
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	/* leave sluff at beginning for added headers */
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	b->rp = b->lim - ROUND(size, BLOCKALIGN);
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	if(b->rp < b->base)
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		panic("_ucallocb");
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	b->wp = b->rp;
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	return b;
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}
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Block*
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ucallocb(int size)
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{
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	Block *b;
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	/*
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	 * Check in a process and wait until successful.
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	 * Can still error out of here, though.
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	 */
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	if(up == nil)
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		panic("ucallocb without up: %#p", getcallerpc(&size));
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	if((b = _ucallocb(size)) == nil)
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		panic("ucallocb: no memory for %d bytes", size);
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	setmalloctag(b, getcallerpc(&size));
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	return b;
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}
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Block*
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uciallocb(int size)
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{
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	Block *b;
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	static int m1, m2, mp;
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	if(0 && ucialloc.bytes > conf.ialloc){
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		if((m1++%10000)==0){
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			if(mp++ > 1000){
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				active.exiting = 1;
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				exit(0);
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			}
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			iprint("uciallocb: limited %lud/%lud\n",
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				ucialloc.bytes, conf.ialloc);
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		}
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		return nil;
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	}
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	if((b = _ucallocb(size)) == nil){
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		if(0 && (m2++%10000)==0){
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			if(mp++ > 1000){
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				active.exiting = 1;
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				exit(0);
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			}
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			iprint("uciallocb: no memory %lud/%lud\n",
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				ucialloc.bytes, conf.ialloc);
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		}
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		return nil;
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	}
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	setmalloctag(b, getcallerpc(&size));
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	b->flag = BINTR;
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	ilock(&ucialloc);
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	ucialloc.bytes += b->lim - b->base;
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	iunlock(&ucialloc);
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	return b;
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}
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void
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ucfreeb(Block *b)
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{
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	void *dead = (void*)Bdead;
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	long ref;
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	if(b == nil || (ref = _xdec(&b->ref)) > 0)
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		return;
124 
 
125 
	if(ref < 0){
126 
		dumpstack();
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		panic("ucfreeb: ref %ld; caller pc %#p", ref, getcallerpc(&b));
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	}
129 
 
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	/*
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	 * drivers which perform non cache coherent DMA manage their own buffer
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	 * pool of uncached buffers and provide their own free routine.
133 
	 */
134 
	if(b->free) {
135 
		b->free(b);
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		return;
137 
	}
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	if(b->flag & BINTR) {
139 
		ilock(&ucialloc);
140 
		ucialloc.bytes -= b->lim - b->base;
141 
		iunlock(&ucialloc);
142 
	}
143 
 
144 
	/* poison the block in case someone is still holding onto it */
145 
	b->next = dead;
146 
	b->rp = dead;
147 
	b->wp = dead;
148 
	b->lim = dead;
149 
	b->base = dead;
150 
 
151 
	ucfree(b);
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}