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This is a fix for the 32K DMA buffer region that was not accounted for,

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it relocates it to be after the BIOS memory hole instead of right below
the 640K limit.
THANK YOU CHRIS!!!

From: <cgd@postgres.Berkeley.EDU>
Date: Wed, 29 Sep 93 18:49:58 -0700
basically, reserve a new 32k space right after firstaddr,
and put the buffer space there...

the diffs are below, and are in ~cgd/sys/i386/i386 (in machdep.c)
on freefall.  i obviously can't test them, so if some of you would
look the diffs over and try them out...
This commit is contained in:
rgrimes 1993-09-30 23:16:17 +00:00
parent d4eb979776
commit a27ff697e2
2 changed files with 24 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
sys/amd64/amd64/pmap.c
View File

@ -34,16 +34,10 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)pmap.c 7.7 (Berkeley) 5/12/91
*
* PATCHES MAGIC LEVEL PATCH THAT GOT US HERE
* -------------------- ----- ----------------------
* CURRENT PATCH LEVEL: 1 00063
* -------------------- ----- ----------------------
*
* 28 Nov 1991 Poul-Henning Kamp Speedup processing.
* from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
* $Id$
*/
static char rcsid[] = "$Header: /a/cvs/386BSD/src/sys/i386/i386/pmap.c,v 1.2 1993/07/27 10:52:19 davidg Exp $";
static char rcsid[] = "$Id$";
/*
* Derived from hp300 version by Mike Hibler, this version by William
@ -229,7 +223,7 @@ pmap_bootstrap(firstaddr, loadaddr)
extern vm_offset_t maxmem, physmem;
extern int IdlePTD;
avail_start = firstaddr;
avail_start = firstaddr + 8 * NBPG;
avail_end = maxmem << PG_SHIFT;
/* XXX: allow for msgbuf */
@ -256,6 +250,8 @@ extern int IdlePTD;
/*
* Create Kernel page directory table and page maps.
* [ currently done in locore. i have wild and crazy ideas -wfj ]
* XXX IF THIS IS EVER USED, IT MUST BE MOVED TO THE TOP
* OF THIS ROUTINE -- cgd
*/
bzero(firstaddr, 4*NBPG);
kernel_pmap->pm_pdir = firstaddr + VM_MIN_KERNEL_ADDRESS;
@ -294,15 +290,16 @@ extern int IdlePTD;
#endif
/*
* reserve special hunk of memory for use by bus dma as a bounce
* buffer (contiguous virtual *and* physical memory). for now,
* assume vm does not use memory beneath hole, and we know that
* the bootstrap uses top 32k of base memory. -wfj
* buffer (contiguous virtual *and* physical memory).
* do it from firstaddr -> firstaddr+8 pages. note that
* avail_start was bumped up 8 pages, above, to accomodate this.
*/
{
extern vm_offset_t isaphysmem;
isaphysmem = va;
virtual_avail = pmap_map(va, 0xa0000 - 32*1024, 0xa0000, VM_PROT_ALL);
isaphysmem = va;
virtual_avail = pmap_map(va, firstaddr, firstaddr + 8*NBPG,
VM_PROT_ALL);
}
*(int *)PTD = 0;

27
sys/i386/i386/pmap.c
View File

@ -34,16 +34,10 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)pmap.c 7.7 (Berkeley) 5/12/91
*
* PATCHES MAGIC LEVEL PATCH THAT GOT US HERE
* -------------------- ----- ----------------------
* CURRENT PATCH LEVEL: 1 00063
* -------------------- ----- ----------------------
*
* 28 Nov 1991 Poul-Henning Kamp Speedup processing.
* from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
* $Id$
*/
static char rcsid[] = "$Header: /a/cvs/386BSD/src/sys/i386/i386/pmap.c,v 1.2 1993/07/27 10:52:19 davidg Exp $";
static char rcsid[] = "$Id$";
/*
* Derived from hp300 version by Mike Hibler, this version by William
@ -229,7 +223,7 @@ pmap_bootstrap(firstaddr, loadaddr)
extern vm_offset_t maxmem, physmem;
extern int IdlePTD;
avail_start = firstaddr;
avail_start = firstaddr + 8 * NBPG;
avail_end = maxmem << PG_SHIFT;
/* XXX: allow for msgbuf */
@ -256,6 +250,8 @@ extern int IdlePTD;
/*
* Create Kernel page directory table and page maps.
* [ currently done in locore. i have wild and crazy ideas -wfj ]
* XXX IF THIS IS EVER USED, IT MUST BE MOVED TO THE TOP
* OF THIS ROUTINE -- cgd
*/
bzero(firstaddr, 4*NBPG);
kernel_pmap->pm_pdir = firstaddr + VM_MIN_KERNEL_ADDRESS;
@ -294,15 +290,16 @@ extern int IdlePTD;
#endif
/*
* reserve special hunk of memory for use by bus dma as a bounce
* buffer (contiguous virtual *and* physical memory). for now,
* assume vm does not use memory beneath hole, and we know that
* the bootstrap uses top 32k of base memory. -wfj
* buffer (contiguous virtual *and* physical memory).
* do it from firstaddr -> firstaddr+8 pages. note that
* avail_start was bumped up 8 pages, above, to accomodate this.
*/
{
extern vm_offset_t isaphysmem;
isaphysmem = va;
virtual_avail = pmap_map(va, 0xa0000 - 32*1024, 0xa0000, VM_PROT_ALL);
isaphysmem = va;
virtual_avail = pmap_map(va, firstaddr, firstaddr + 8*NBPG,
VM_PROT_ALL);
}
*(int *)PTD = 0;