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WebSVN – planix.SVN – Blame – /os/branches/planix-v0/sys/src/cmd/unix/drawterm/kern/allocb.c – Rev 2

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#include	"u.h"
2 
#include	"lib.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	lk;
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	ulong	bytes;
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} ialloc;
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static Block*
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_allocb(int size)
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{
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	Block *b;
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	uintptr addr;
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	if((b = mallocz(sizeof(Block)+size+Hdrspc, 0)) == 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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	/* align start of data portion by rounding up */
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	addr = (uintptr)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) + sizeof(Block)+size+Hdrspc;
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	addr = (uintptr)(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("_allocb");
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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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allocb(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("allocb without up: %p\n", getcallerpc(&size));
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	if((b = _allocb(size)) == nil){
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		panic("allocb: no memory for %d bytes\n", size);
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	}
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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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iallocb(int size)
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{
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	Block *b;
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	static int m1, m2;
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	if(ialloc.bytes > conf.ialloc){
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		if((m1++%10000)==0)
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			print("iallocb: limited %lud/%lud\n",
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				ialloc.bytes, conf.ialloc);
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		return 0;
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	}
84 
 
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	if((b = _allocb(size)) == nil){
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		if((m2++%10000)==0)
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			print("iallocb: no memory %lud/%lud\n",
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				ialloc.bytes, conf.ialloc);
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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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94 
	ilock(&ialloc.lk);
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	ialloc.bytes += b->lim - b->base;
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	iunlock(&ialloc.lk);
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	return b;
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}
100 
 
101 
void
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freeb(Block *b)
103 
{
104 
	void *dead = (void*)Bdead;
105 
 
106 
	if(b == nil)
107 
		return;
108 
 
109 
	/*
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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.
112 
	 */
113 
	if(b->free) {
114 
		b->free(b);
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		return;
116 
	}
117 
	if(b->flag & BINTR) {
118 
		ilock(&ialloc.lk);
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		ialloc.bytes -= b->lim - b->base;
120 
		iunlock(&ialloc.lk);
121 
	}
122 
 
123 
	/* poison the block in case someone is still holding onto it */
124 
	b->next = dead;
125 
	b->rp = dead;
126 
	b->wp = dead;
127 
	b->lim = dead;
128 
	b->base = dead;
129 
 
130 
	free(b);
131 
}
132 
 
133 
void
134 
checkb(Block *b, char *msg)
135 
{
136 
	void *dead = (void*)Bdead;
137 
 
138 
	if(b == dead)
139 
		panic("checkb b %s %lux", msg, b);
140 
	if(b->base == dead || b->lim == dead || b->next == dead
141 
	  || b->rp == dead || b->wp == dead){
142 
		print("checkb: base 0x%8.8luX lim 0x%8.8luX next 0x%8.8luX\n",
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			b->base, b->lim, b->next);
144 
		print("checkb: rp 0x%8.8luX wp 0x%8.8luX\n", b->rp, b->wp);
145 
		panic("checkb dead: %s\n", msg);
146 
	}
147 
 
148 
	if(b->base > b->lim)
149 
		panic("checkb 0 %s %lux %lux", msg, b->base, b->lim);
150 
	if(b->rp < b->base)
151 
		panic("checkb 1 %s %lux %lux", msg, b->base, b->rp);
152 
	if(b->wp < b->base)
153 
		panic("checkb 2 %s %lux %lux", msg, b->base, b->wp);
154 
	if(b->rp > b->lim)
155 
		panic("checkb 3 %s %lux %lux", msg, b->rp, b->lim);
156 
	if(b->wp > b->lim)
157 
		panic("checkb 4 %s %lux %lux", msg, b->wp, b->lim);
158 
 
159 
}
160 
 
161 
void
162 
iallocsummary(void)
163 
{
164 
	print("ialloc %lud/%lud\n", ialloc.bytes, conf.ialloc);
165 
}