166 lines
3.1 KiB
C
166 lines
3.1 KiB
C
#include "u.h"
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#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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ulong 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 = (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) + sizeof(Block)+size+Hdrspc;
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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("_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: %luX\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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}
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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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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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}
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void
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freeb(Block *b)
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{
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void *dead = (void*)Bdead;
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if(b == nil)
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return;
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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.
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*/
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if(b->free) {
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b->free(b);
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return;
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}
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if(b->flag & BINTR) {
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ilock(&ialloc.lk);
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ialloc.bytes -= b->lim - b->base;
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iunlock(&ialloc.lk);
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}
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/* poison the block in case someone is still holding onto it */
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b->next = dead;
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b->rp = dead;
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b->wp = dead;
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b->lim = dead;
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b->base = dead;
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free(b);
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}
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void
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checkb(Block *b, char *msg)
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{
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void *dead = (void*)Bdead;
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if(b == dead)
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panic("checkb b %s %lux", msg, b);
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if(b->base == dead || b->lim == dead || b->next == dead
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|| b->rp == dead || b->wp == dead){
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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);
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print("checkb: rp 0x%8.8luX wp 0x%8.8luX\n", b->rp, b->wp);
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panic("checkb dead: %s\n", msg);
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}
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if(b->base > b->lim)
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panic("checkb 0 %s %lux %lux", msg, b->base, b->lim);
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if(b->rp < b->base)
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panic("checkb 1 %s %lux %lux", msg, b->base, b->rp);
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if(b->wp < b->base)
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panic("checkb 2 %s %lux %lux", msg, b->base, b->wp);
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if(b->rp > b->lim)
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panic("checkb 3 %s %lux %lux", msg, b->rp, b->lim);
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if(b->wp > b->lim)
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panic("checkb 4 %s %lux %lux", msg, b->wp, b->lim);
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}
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void
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iallocsummary(void)
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{
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print("ialloc %lud/%lud\n", ialloc.bytes, conf.ialloc);
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}
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