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Bounce buffers. From John Dyson with help from me.
This commit is contained in:
David Greenman
parent
d165d4acee
commit
d5e26ef0ef
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=1298
@ -35,7 +35,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
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* $Id: machdep.c,v 1.38 1994/03/07 11:47:31 davidg Exp $
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* $Id: machdep.c,v 1.39 1994/03/19 23:58:58 wollman Exp $
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*/
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#include "npx.h"
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@ -117,7 +117,13 @@ int bufpages = BUFPAGES;
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#else
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int bufpages = 0;
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#endif
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#ifdef BOUNCEPAGES
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int bouncepages = BOUNCEPAGES;
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#else
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int bouncepages = 0;
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#endif
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extern int freebufspace;
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extern char *bouncememory;
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int _udatasel, _ucodesel;
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@ -244,6 +250,18 @@ again:
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valloc(swbuf, struct buf, nswbuf);
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valloc(buf, struct buf, nbuf);
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#ifndef NOBOUNCE
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/*
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* If there is more than 16MB of memory, allocate some bounce buffers
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*/
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if (Maxmem > 4096) {
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if (bouncepages == 0)
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bouncepages = 96; /* largest physio size + extra */
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v = (caddr_t)((vm_offset_t)((vm_offset_t)v + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1));
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valloc(bouncememory, char, bouncepages * PAGE_SIZE);
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}
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#endif
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/*
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* End of first pass, size has been calculated so allocate memory
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*/
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@ -294,6 +312,13 @@ again:
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printf("using %d buffers containing %d bytes of memory\n",
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nbuf, bufpages * CLBYTES);
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#ifndef NOBOUNCE
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/*
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* init bounce buffers
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*/
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vm_bounce_init();
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#endif
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/*
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* Set up CPU-specific registers, cache, etc.
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*/
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@ -37,7 +37,7 @@
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*
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* from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
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* Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
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* $Id: vm_machdep.c,v 1.12 1994/03/07 11:38:36 davidg Exp $
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* $Id: vm_machdep.c,v 1.13 1994/03/21 09:35:10 davidg Exp $
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*/
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#include "npx.h"
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@ -53,6 +53,338 @@
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#include "vm/vm.h"
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#include "vm/vm_kern.h"
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#ifndef NOBOUNCE
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caddr_t bouncememory;
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vm_offset_t bouncepa, bouncepaend;
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int bouncepages;
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vm_map_t bounce_map;
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int bmwait, bmfreeing;
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int bounceallocarraysize;
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unsigned *bounceallocarray;
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int bouncefree;
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#define SIXTEENMEG (4096*4096)
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#define MAXBKVA 512
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/* special list that can be used at interrupt time for eventual kva free */
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struct kvasfree {
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vm_offset_t addr;
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vm_offset_t size;
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} kvaf[MAXBKVA];
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int kvasfreecnt;
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/*
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* get bounce buffer pages (count physically contiguous)
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* (only 1 inplemented now)
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*/
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vm_offset_t
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vm_bounce_page_find(count)
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int count;
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{
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int bit;
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int s,i;
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if (count != 1)
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panic("vm_bounce_page_find -- no support for > 1 page yet!!!");
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s = splbio();
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retry:
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for (i = 0; i < bounceallocarraysize; i++) {
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if (bounceallocarray[i] != 0xffffffff) {
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if (bit = ffs(~bounceallocarray[i])) {
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bounceallocarray[i] |= 1 << (bit - 1) ;
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bouncefree -= count;
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splx(s);
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return bouncepa + (i * 8 * sizeof(unsigned) + (bit - 1)) * NBPG;
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}
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}
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}
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tsleep((caddr_t) &bounceallocarray, PRIBIO, "bncwai", 0);
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goto retry;
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}
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/*
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* free count bounce buffer pages
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*/
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void
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vm_bounce_page_free(pa, count)
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vm_offset_t pa;
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int count;
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{
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int allocindex;
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int index;
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int bit;
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if (count != 1)
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panic("vm_bounce_page_free -- no support for > 1 page yet!!!\n");
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index = (pa - bouncepa) / NBPG;
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if ((index < 0) || (index >= bouncepages))
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panic("vm_bounce_page_free -- bad index\n");
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allocindex = index / (8 * sizeof(unsigned));
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bit = index % (8 * sizeof(unsigned));
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bounceallocarray[allocindex] &= ~(1 << bit);
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bouncefree += count;
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wakeup((caddr_t) &bounceallocarray);
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}
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/*
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* allocate count bounce buffer kva pages
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*/
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vm_offset_t
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vm_bounce_kva(count)
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int count;
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{
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int tofree;
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int i;
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int startfree;
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vm_offset_t kva;
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int s = splbio();
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startfree = 0;
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more:
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if (!bmfreeing && (tofree = kvasfreecnt)) {
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bmfreeing = 1;
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more1:
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for (i = startfree; i < kvasfreecnt; i++) {
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pmap_remove(kernel_pmap,
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kvaf[i].addr, kvaf[i].addr + kvaf[i].size);
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kmem_free_wakeup(bounce_map, kvaf[i].addr,
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kvaf[i].size);
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}
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if (kvasfreecnt != tofree) {
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startfree = i;
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bmfreeing = 0;
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goto more;
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}
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kvasfreecnt = 0;
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bmfreeing = 0;
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}
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if (!(kva = kmem_alloc_pageable(bounce_map, count * NBPG))) {
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bmwait = 1;
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tsleep((caddr_t) bounce_map, PRIBIO, "bmwait", 0);
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goto more;
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}
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splx(s);
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return kva;
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}
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/*
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* init the bounce buffer system
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*/
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void
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vm_bounce_init()
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{
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vm_offset_t minaddr, maxaddr;
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if (bouncepages == 0)
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return;
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bounceallocarraysize = (bouncepages + (8*sizeof(unsigned))-1) / (8 * sizeof(unsigned));
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bounceallocarray = malloc(bounceallocarraysize * sizeof(unsigned), M_TEMP, M_NOWAIT);
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if (!bounceallocarray)
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panic("Cannot allocate bounce resource array\n");
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bzero(bounceallocarray, bounceallocarraysize * sizeof(long));
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bounce_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, MAXBKVA * NBPG, FALSE);
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bouncepa = pmap_extract(kernel_pmap, (vm_offset_t) bouncememory);
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bouncepaend = bouncepa + bouncepages * NBPG;
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bouncefree = bouncepages;
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kvasfreecnt = 0;
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}
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/*
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* do the things necessary to the struct buf to implement
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* bounce buffers... inserted before the disk sort
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*/
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void
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vm_bounce_alloc(bp)
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struct buf *bp;
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{
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int countvmpg;
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vm_offset_t vastart, vaend;
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vm_offset_t vapstart, vapend;
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vm_offset_t va, kva;
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vm_offset_t pa;
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int dobounceflag = 0;
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int bounceindex;
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int i;
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int s;
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if (bouncepages == 0)
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return;
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vastart = (vm_offset_t) bp->b_un.b_addr;
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vaend = (vm_offset_t) bp->b_un.b_addr + bp->b_bcount;
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vapstart = i386_trunc_page(vastart);
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vapend = i386_round_page(vaend);
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countvmpg = (vapend - vapstart) / NBPG;
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/*
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* if any page is above 16MB, then go into bounce-buffer mode
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*/
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va = vapstart;
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for (i = 0; i < countvmpg; i++) {
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pa = pmap_extract(kernel_pmap, va);
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if (pa >= SIXTEENMEG)
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++dobounceflag;
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va += NBPG;
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}
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if (dobounceflag == 0)
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return;
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if (bouncepages < dobounceflag)
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panic("Not enough bounce buffers!!!");
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/*
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* allocate a replacement kva for b_addr
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*/
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kva = vm_bounce_kva(countvmpg);
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va = vapstart;
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for (i = 0; i < countvmpg; i++) {
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pa = pmap_extract(kernel_pmap, va);
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if (pa >= SIXTEENMEG) {
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/*
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* allocate a replacement page
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*/
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vm_offset_t bpa = vm_bounce_page_find(1);
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pmap_enter(kernel_pmap, kva + (NBPG * i), bpa, VM_PROT_DEFAULT,
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TRUE);
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/*
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* if we are writing, the copy the data into the page
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*/
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if ((bp->b_flags & B_READ) == 0)
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bcopy((caddr_t) va, (caddr_t) kva + (NBPG * i), NBPG);
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} else {
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/*
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* use original page
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*/
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pmap_enter(kernel_pmap, kva + (NBPG * i), pa, VM_PROT_DEFAULT,
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TRUE);
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}
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va += NBPG;
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}
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/*
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* flag the buffer as being bounced
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*/
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bp->b_flags |= B_BOUNCE;
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/*
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* save the original buffer kva
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*/
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bp->b_savekva = bp->b_un.b_addr;
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/*
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* put our new kva into the buffer (offset by original offset)
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*/
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bp->b_un.b_addr = (caddr_t) (((vm_offset_t) kva) |
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((vm_offset_t) bp->b_savekva & (NBPG - 1)));
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return;
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}
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/*
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* hook into biodone to free bounce buffer
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*/
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void
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vm_bounce_free(bp)
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struct buf *bp;
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{
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int i;
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vm_offset_t origkva, bouncekva;
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vm_offset_t vastart, vaend;
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vm_offset_t vapstart, vapend;
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int countbounce = 0;
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vm_offset_t firstbouncepa = 0;
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int firstbounceindex;
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int countvmpg;
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vm_offset_t bcount;
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int s;
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/*
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* if this isn't a bounced buffer, then just return
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*/
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if ((bp->b_flags & B_BOUNCE) == 0)
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return;
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origkva = (vm_offset_t) bp->b_savekva;
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bouncekva = (vm_offset_t) bp->b_un.b_addr;
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vastart = bouncekva;
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vaend = bouncekva + bp->b_bcount;
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bcount = bp->b_bcount;
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vapstart = i386_trunc_page(vastart);
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vapend = i386_round_page(vaend);
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countvmpg = (vapend - vapstart) / NBPG;
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/*
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* check every page in the kva space for b_addr
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*/
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for (i = 0; i < countvmpg; i++) {
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vm_offset_t mybouncepa;
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vm_offset_t copycount;
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copycount = i386_round_page(bouncekva + 1) - bouncekva;
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mybouncepa = pmap_extract(kernel_pmap, i386_trunc_page(bouncekva));
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/*
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* if this is a bounced pa, then process as one
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*/
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if ((mybouncepa >= bouncepa) && (mybouncepa < bouncepaend)) {
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if (copycount > bcount)
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copycount = bcount;
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/*
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* if this is a read, then copy from bounce buffer into original buffer
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*/
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if (bp->b_flags & B_READ)
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bcopy((caddr_t) bouncekva, (caddr_t) origkva, copycount);
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/*
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* free the bounce allocation
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*/
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vm_bounce_page_free(i386_trunc_page(mybouncepa), 1);
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}
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origkva += copycount;
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bouncekva += copycount;
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bcount -= copycount;
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}
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/*
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* add the old kva into the "to free" list
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*/
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bouncekva = i386_trunc_page((vm_offset_t) bp->b_un.b_addr);
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kvaf[kvasfreecnt].addr = bouncekva;
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kvaf[kvasfreecnt++].size = countvmpg * NBPG;
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if (bmwait) {
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/*
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* if anyone is waiting on the bounce-map, then wakeup
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*/
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wakeup((caddr_t) bounce_map);
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bmwait = 0;
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}
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bp->b_un.b_addr = bp->b_savekva;
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bp->b_savekva = 0;
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bp->b_flags &= ~B_BOUNCE;
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return;
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}
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#endif /* NOBOUNCE */
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/*
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* Finish a fork operation, with process p2 nearly set up.
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* Copy and update the kernel stack and pcb, making the child
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@ -35,7 +35,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
|
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* $Id: machdep.c,v 1.38 1994/03/07 11:47:31 davidg Exp $
|
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* $Id: machdep.c,v 1.39 1994/03/19 23:58:58 wollman Exp $
|
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*/
|
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|
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#include "npx.h"
|
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@ -117,7 +117,13 @@ int bufpages = BUFPAGES;
|
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#else
|
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int bufpages = 0;
|
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#endif
|
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#ifdef BOUNCEPAGES
|
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int bouncepages = BOUNCEPAGES;
|
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#else
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int bouncepages = 0;
|
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#endif
|
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extern int freebufspace;
|
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extern char *bouncememory;
|
||||
|
||||
int _udatasel, _ucodesel;
|
||||
|
||||
@ -244,6 +250,18 @@ again:
|
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valloc(swbuf, struct buf, nswbuf);
|
||||
valloc(buf, struct buf, nbuf);
|
||||
|
||||
#ifndef NOBOUNCE
|
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/*
|
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* If there is more than 16MB of memory, allocate some bounce buffers
|
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*/
|
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if (Maxmem > 4096) {
|
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if (bouncepages == 0)
|
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bouncepages = 96; /* largest physio size + extra */
|
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v = (caddr_t)((vm_offset_t)((vm_offset_t)v + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1));
|
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valloc(bouncememory, char, bouncepages * PAGE_SIZE);
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}
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#endif
|
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|
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/*
|
||||
* End of first pass, size has been calculated so allocate memory
|
||||
*/
|
||||
@ -294,6 +312,13 @@ again:
|
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printf("using %d buffers containing %d bytes of memory\n",
|
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nbuf, bufpages * CLBYTES);
|
||||
|
||||
#ifndef NOBOUNCE
|
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/*
|
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* init bounce buffers
|
||||
*/
|
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vm_bounce_init();
|
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#endif
|
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|
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/*
|
||||
* Set up CPU-specific registers, cache, etc.
|
||||
*/
|
||||
|
||||
@ -37,7 +37,7 @@
|
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*
|
||||
* from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
|
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* Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
|
||||
* $Id: vm_machdep.c,v 1.12 1994/03/07 11:38:36 davidg Exp $
|
||||
* $Id: vm_machdep.c,v 1.13 1994/03/21 09:35:10 davidg Exp $
|
||||
*/
|
||||
|
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#include "npx.h"
|
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@ -53,6 +53,338 @@
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#include "vm/vm.h"
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#include "vm/vm_kern.h"
|
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|
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#ifndef NOBOUNCE
|
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|
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caddr_t bouncememory;
|
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vm_offset_t bouncepa, bouncepaend;
|
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int bouncepages;
|
||||
vm_map_t bounce_map;
|
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int bmwait, bmfreeing;
|
||||
|
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int bounceallocarraysize;
|
||||
unsigned *bounceallocarray;
|
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int bouncefree;
|
||||
|
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#define SIXTEENMEG (4096*4096)
|
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#define MAXBKVA 512
|
||||
|
||||
/* special list that can be used at interrupt time for eventual kva free */
|
||||
struct kvasfree {
|
||||
vm_offset_t addr;
|
||||
vm_offset_t size;
|
||||
} kvaf[MAXBKVA];
|
||||
|
||||
int kvasfreecnt;
|
||||
|
||||
/*
|
||||
* get bounce buffer pages (count physically contiguous)
|
||||
* (only 1 inplemented now)
|
||||
*/
|
||||
vm_offset_t
|
||||
vm_bounce_page_find(count)
|
||||
int count;
|
||||
{
|
||||
int bit;
|
||||
int s,i;
|
||||
|
||||
if (count != 1)
|
||||
panic("vm_bounce_page_find -- no support for > 1 page yet!!!");
|
||||
|
||||
s = splbio();
|
||||
retry:
|
||||
for (i = 0; i < bounceallocarraysize; i++) {
|
||||
if (bounceallocarray[i] != 0xffffffff) {
|
||||
if (bit = ffs(~bounceallocarray[i])) {
|
||||
bounceallocarray[i] |= 1 << (bit - 1) ;
|
||||
bouncefree -= count;
|
||||
splx(s);
|
||||
return bouncepa + (i * 8 * sizeof(unsigned) + (bit - 1)) * NBPG;
|
||||
}
|
||||
}
|
||||
}
|
||||
tsleep((caddr_t) &bounceallocarray, PRIBIO, "bncwai", 0);
|
||||
goto retry;
|
||||
}
|
||||
|
||||
/*
|
||||
* free count bounce buffer pages
|
||||
*/
|
||||
void
|
||||
vm_bounce_page_free(pa, count)
|
||||
vm_offset_t pa;
|
||||
int count;
|
||||
{
|
||||
int allocindex;
|
||||
int index;
|
||||
int bit;
|
||||
|
||||
if (count != 1)
|
||||
panic("vm_bounce_page_free -- no support for > 1 page yet!!!\n");
|
||||
|
||||
index = (pa - bouncepa) / NBPG;
|
||||
|
||||
if ((index < 0) || (index >= bouncepages))
|
||||
panic("vm_bounce_page_free -- bad index\n");
|
||||
|
||||
allocindex = index / (8 * sizeof(unsigned));
|
||||
bit = index % (8 * sizeof(unsigned));
|
||||
|
||||
bounceallocarray[allocindex] &= ~(1 << bit);
|
||||
|
||||
bouncefree += count;
|
||||
wakeup((caddr_t) &bounceallocarray);
|
||||
}
|
||||
|
||||
/*
|
||||
* allocate count bounce buffer kva pages
|
||||
*/
|
||||
vm_offset_t
|
||||
vm_bounce_kva(count)
|
||||
int count;
|
||||
{
|
||||
int tofree;
|
||||
int i;
|
||||
int startfree;
|
||||
vm_offset_t kva;
|
||||
int s = splbio();
|
||||
startfree = 0;
|
||||
more:
|
||||
if (!bmfreeing && (tofree = kvasfreecnt)) {
|
||||
bmfreeing = 1;
|
||||
more1:
|
||||
for (i = startfree; i < kvasfreecnt; i++) {
|
||||
pmap_remove(kernel_pmap,
|
||||
kvaf[i].addr, kvaf[i].addr + kvaf[i].size);
|
||||
kmem_free_wakeup(bounce_map, kvaf[i].addr,
|
||||
kvaf[i].size);
|
||||
}
|
||||
if (kvasfreecnt != tofree) {
|
||||
startfree = i;
|
||||
bmfreeing = 0;
|
||||
goto more;
|
||||
}
|
||||
kvasfreecnt = 0;
|
||||
bmfreeing = 0;
|
||||
}
|
||||
|
||||
if (!(kva = kmem_alloc_pageable(bounce_map, count * NBPG))) {
|
||||
bmwait = 1;
|
||||
tsleep((caddr_t) bounce_map, PRIBIO, "bmwait", 0);
|
||||
goto more;
|
||||
}
|
||||
|
||||
splx(s);
|
||||
|
||||
return kva;
|
||||
}
|
||||
|
||||
/*
|
||||
* init the bounce buffer system
|
||||
*/
|
||||
void
|
||||
vm_bounce_init()
|
||||
{
|
||||
vm_offset_t minaddr, maxaddr;
|
||||
|
||||
if (bouncepages == 0)
|
||||
return;
|
||||
|
||||
bounceallocarraysize = (bouncepages + (8*sizeof(unsigned))-1) / (8 * sizeof(unsigned));
|
||||
bounceallocarray = malloc(bounceallocarraysize * sizeof(unsigned), M_TEMP, M_NOWAIT);
|
||||
|
||||
if (!bounceallocarray)
|
||||
panic("Cannot allocate bounce resource array\n");
|
||||
|
||||
bzero(bounceallocarray, bounceallocarraysize * sizeof(long));
|
||||
|
||||
bounce_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, MAXBKVA * NBPG, FALSE);
|
||||
|
||||
bouncepa = pmap_extract(kernel_pmap, (vm_offset_t) bouncememory);
|
||||
bouncepaend = bouncepa + bouncepages * NBPG;
|
||||
bouncefree = bouncepages;
|
||||
kvasfreecnt = 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* do the things necessary to the struct buf to implement
|
||||
* bounce buffers... inserted before the disk sort
|
||||
*/
|
||||
void
|
||||
vm_bounce_alloc(bp)
|
||||
struct buf *bp;
|
||||
{
|
||||
int countvmpg;
|
||||
vm_offset_t vastart, vaend;
|
||||
vm_offset_t vapstart, vapend;
|
||||
vm_offset_t va, kva;
|
||||
vm_offset_t pa;
|
||||
int dobounceflag = 0;
|
||||
int bounceindex;
|
||||
int i;
|
||||
int s;
|
||||
|
||||
if (bouncepages == 0)
|
||||
return;
|
||||
|
||||
vastart = (vm_offset_t) bp->b_un.b_addr;
|
||||
vaend = (vm_offset_t) bp->b_un.b_addr + bp->b_bcount;
|
||||
|
||||
vapstart = i386_trunc_page(vastart);
|
||||
vapend = i386_round_page(vaend);
|
||||
countvmpg = (vapend - vapstart) / NBPG;
|
||||
|
||||
/*
|
||||
* if any page is above 16MB, then go into bounce-buffer mode
|
||||
*/
|
||||
va = vapstart;
|
||||
for (i = 0; i < countvmpg; i++) {
|
||||
pa = pmap_extract(kernel_pmap, va);
|
||||
if (pa >= SIXTEENMEG)
|
||||
++dobounceflag;
|
||||
va += NBPG;
|
||||
}
|
||||
if (dobounceflag == 0)
|
||||
return;
|
||||
|
||||
if (bouncepages < dobounceflag)
|
||||
panic("Not enough bounce buffers!!!");
|
||||
|
||||
/*
|
||||
* allocate a replacement kva for b_addr
|
||||
*/
|
||||
kva = vm_bounce_kva(countvmpg);
|
||||
va = vapstart;
|
||||
for (i = 0; i < countvmpg; i++) {
|
||||
pa = pmap_extract(kernel_pmap, va);
|
||||
if (pa >= SIXTEENMEG) {
|
||||
/*
|
||||
* allocate a replacement page
|
||||
*/
|
||||
vm_offset_t bpa = vm_bounce_page_find(1);
|
||||
pmap_enter(kernel_pmap, kva + (NBPG * i), bpa, VM_PROT_DEFAULT,
|
||||
TRUE);
|
||||
/*
|
||||
* if we are writing, the copy the data into the page
|
||||
*/
|
||||
if ((bp->b_flags & B_READ) == 0)
|
||||
bcopy((caddr_t) va, (caddr_t) kva + (NBPG * i), NBPG);
|
||||
} else {
|
||||
/*
|
||||
* use original page
|
||||
*/
|
||||
pmap_enter(kernel_pmap, kva + (NBPG * i), pa, VM_PROT_DEFAULT,
|
||||
TRUE);
|
||||
}
|
||||
va += NBPG;
|
||||
}
|
||||
|
||||
/*
|
||||
* flag the buffer as being bounced
|
||||
*/
|
||||
bp->b_flags |= B_BOUNCE;
|
||||
/*
|
||||
* save the original buffer kva
|
||||
*/
|
||||
bp->b_savekva = bp->b_un.b_addr;
|
||||
/*
|
||||
* put our new kva into the buffer (offset by original offset)
|
||||
*/
|
||||
bp->b_un.b_addr = (caddr_t) (((vm_offset_t) kva) |
|
||||
((vm_offset_t) bp->b_savekva & (NBPG - 1)));
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* hook into biodone to free bounce buffer
|
||||
*/
|
||||
void
|
||||
vm_bounce_free(bp)
|
||||
struct buf *bp;
|
||||
{
|
||||
int i;
|
||||
vm_offset_t origkva, bouncekva;
|
||||
vm_offset_t vastart, vaend;
|
||||
vm_offset_t vapstart, vapend;
|
||||
int countbounce = 0;
|
||||
vm_offset_t firstbouncepa = 0;
|
||||
int firstbounceindex;
|
||||
int countvmpg;
|
||||
vm_offset_t bcount;
|
||||
int s;
|
||||
|
||||
/*
|
||||
* if this isn't a bounced buffer, then just return
|
||||
*/
|
||||
if ((bp->b_flags & B_BOUNCE) == 0)
|
||||
return;
|
||||
|
||||
origkva = (vm_offset_t) bp->b_savekva;
|
||||
bouncekva = (vm_offset_t) bp->b_un.b_addr;
|
||||
|
||||
vastart = bouncekva;
|
||||
vaend = bouncekva + bp->b_bcount;
|
||||
bcount = bp->b_bcount;
|
||||
|
||||
vapstart = i386_trunc_page(vastart);
|
||||
vapend = i386_round_page(vaend);
|
||||
|
||||
countvmpg = (vapend - vapstart) / NBPG;
|
||||
|
||||
/*
|
||||
* check every page in the kva space for b_addr
|
||||
*/
|
||||
for (i = 0; i < countvmpg; i++) {
|
||||
vm_offset_t mybouncepa;
|
||||
vm_offset_t copycount;
|
||||
|
||||
copycount = i386_round_page(bouncekva + 1) - bouncekva;
|
||||
mybouncepa = pmap_extract(kernel_pmap, i386_trunc_page(bouncekva));
|
||||
|
||||
/*
|
||||
* if this is a bounced pa, then process as one
|
||||
*/
|
||||
if ((mybouncepa >= bouncepa) && (mybouncepa < bouncepaend)) {
|
||||
if (copycount > bcount)
|
||||
copycount = bcount;
|
||||
/*
|
||||
* if this is a read, then copy from bounce buffer into original buffer
|
||||
*/
|
||||
if (bp->b_flags & B_READ)
|
||||
bcopy((caddr_t) bouncekva, (caddr_t) origkva, copycount);
|
||||
/*
|
||||
* free the bounce allocation
|
||||
*/
|
||||
vm_bounce_page_free(i386_trunc_page(mybouncepa), 1);
|
||||
}
|
||||
|
||||
origkva += copycount;
|
||||
bouncekva += copycount;
|
||||
bcount -= copycount;
|
||||
}
|
||||
|
||||
/*
|
||||
* add the old kva into the "to free" list
|
||||
*/
|
||||
bouncekva = i386_trunc_page((vm_offset_t) bp->b_un.b_addr);
|
||||
kvaf[kvasfreecnt].addr = bouncekva;
|
||||
kvaf[kvasfreecnt++].size = countvmpg * NBPG;
|
||||
if (bmwait) {
|
||||
/*
|
||||
* if anyone is waiting on the bounce-map, then wakeup
|
||||
*/
|
||||
wakeup((caddr_t) bounce_map);
|
||||
bmwait = 0;
|
||||
}
|
||||
|
||||
bp->b_un.b_addr = bp->b_savekva;
|
||||
bp->b_savekva = 0;
|
||||
bp->b_flags &= ~B_BOUNCE;
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
#endif /* NOBOUNCE */
|
||||
|
||||
/*
|
||||
* Finish a fork operation, with process p2 nearly set up.
|
||||
* Copy and update the kernel stack and pcb, making the child
|
||||
|
||||
@ -12,7 +12,7 @@
|
||||
* on the understanding that TFS is not responsible for the correct
|
||||
* functioning of this software in any circumstances.
|
||||
*
|
||||
* $Id: aha1542.c,v 1.21 1994/03/01 16:06:37 ats Exp $
|
||||
* $Id: aha1542.c,v 1.22 1994/03/20 00:29:58 wollman Exp $
|
||||
*/
|
||||
|
||||
/*
|
||||
@ -589,6 +589,7 @@ ahaattach(dev)
|
||||
aha->sc_link.adapter_targ = aha->aha_scsi_dev;
|
||||
aha->sc_link.adapter = &aha_switch;
|
||||
aha->sc_link.device = &aha_dev;
|
||||
aha->sc_link.flags = SDEV_BOUNCE;
|
||||
|
||||
/*
|
||||
* ask the adapter what subunits are present
|
||||
|
||||
@ -14,7 +14,7 @@
|
||||
*
|
||||
* Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
|
||||
*
|
||||
* $Id: cd.c,v 1.15 1994/01/29 10:30:32 rgrimes Exp $
|
||||
* $Id: cd.c,v 1.16 1994/02/05 09:08:46 swallace Exp $
|
||||
*/
|
||||
|
||||
#define SPLCD splbio
|
||||
@ -419,6 +419,14 @@ cdstrategy(bp)
|
||||
opri = SPLCD();
|
||||
dp = &cd->buf_queue;
|
||||
|
||||
/*
|
||||
* Use a bounce buffer if necessary
|
||||
*/
|
||||
#ifndef NOBOUNCE
|
||||
if (cd->sc_link->flags & SDEV_BOUNCE)
|
||||
vm_bounce_alloc(bp);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Place it in the queue of disk activities for this disk
|
||||
*/
|
||||
|
||||
@ -14,7 +14,7 @@
|
||||
*
|
||||
* Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
|
||||
*
|
||||
* $Id: scsiconf.h,v 1.7 1993/11/18 05:02:59 rgrimes Exp $
|
||||
* $Id: scsiconf.h,v 1.8 1993/12/19 00:54:55 wollman Exp $
|
||||
*/
|
||||
#ifndef SCSI_SCSICONF_H
|
||||
#define SCSI_SCSICONF_H 1
|
||||
@ -134,6 +134,7 @@ struct scsi_link
|
||||
#define SDEV_MEDIA_LOADED 0x01 /* device figures are still valid */
|
||||
#define SDEV_WAITING 0x02 /* a process is waiting for this */
|
||||
#define SDEV_OPEN 0x04 /* at least 1 open session */
|
||||
#define SDEV_BOUNCE 0x08 /* unit requires DMA bounce buffer */
|
||||
#define SDEV_DBX 0xF0 /* debuging flags (scsi_debug.h) */
|
||||
|
||||
/*
|
||||
|
||||
@ -14,7 +14,7 @@
|
||||
*
|
||||
* Ported to run under 386BSD by Julian Elischer (julian@dialix.oz.au) Sept 1992
|
||||
*
|
||||
* $Id: sd.c,v 1.19 1994/03/14 23:09:34 ats Exp $
|
||||
* $Id: sd.c,v 1.20 1994/03/15 20:49:09 ats Exp $
|
||||
*/
|
||||
|
||||
#define SPLSD splbio
|
||||
@ -419,6 +419,14 @@ sdstrategy(bp)
|
||||
opri = SPLSD();
|
||||
dp = &sd->buf_queue;
|
||||
|
||||
/*
|
||||
* Use a bounce buffer if necessary
|
||||
*/
|
||||
#ifndef NOBOUNCE
|
||||
if (sd->sc_link->flags & SDEV_BOUNCE)
|
||||
vm_bounce_alloc(bp);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Place it in the queue of disk activities for this disk
|
||||
*/
|
||||
|
||||
@ -21,13 +21,13 @@
|
||||
* 16 Feb 93 Julian Elischer ADDED for SCSI system
|
||||
* 1.15 is the last version to support MACH and OSF/1
|
||||
*/
|
||||
/* $Revision: 1.14 $ */
|
||||
/* $Revision: 1.15 $ */
|
||||
|
||||
/*
|
||||
* Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
|
||||
* major changes by Julian Elischer (julian@jules.dialix.oz.au) May 1993
|
||||
*
|
||||
* $Id: st.c,v 1.14 1993/12/19 00:54:59 wollman Exp $
|
||||
* $Id: st.c,v 1.15 1994/01/29 10:30:41 rgrimes Exp $
|
||||
*/
|
||||
|
||||
/*
|
||||
@ -911,6 +911,14 @@ ststrategy(bp)
|
||||
stminphys(bp);
|
||||
opri = splbio();
|
||||
|
||||
/*
|
||||
* Use a bounce buffer if necessary
|
||||
*/
|
||||
#ifndef NOBOUNCE
|
||||
if (st->sc_link->flags & SDEV_BOUNCE)
|
||||
vm_bounce_alloc(bp);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Place it in the queue of activities for this tape
|
||||
* at the end (a bit silly because we only have on user..
|
||||
|
||||
Loading…
Reference in New Issue
Block a user