145 lines
2.5 KiB
C
145 lines
2.5 KiB
C
/*
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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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/* 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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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(&ucialloc);
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ucialloc.bytes -= b->lim - b->base;
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iunlock(&ucialloc);
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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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ucfree(b);
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}
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