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vm86_datacall: always use workaround since temp. malloced buffer or stack

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area can be passed (and mapped to page1!) as vesa.c does. Use contigmalloc
now to get proper alignment. Bump max buffer size to PAGE_SIZE
This commit is contained in:
Andrey A. Chernov 1998-09-29 22:06:33 +00:00
parent d297a4c5b4
commit 6b491db1bd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=39786
1 changed files with 18 additions and 22 deletions
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40
sys/i386/i386/vm86.c
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@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: vm86.c,v 1.16 1998/09/29 09:06:00 bde Exp $
* $Id: vm86.c,v 1.17 1998/09/29 20:36:31 ache Exp $
*/
#include "opt_vm86.h"
@ -32,6 +32,7 @@
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <vm/vm.h>
#include <vm/vm_prot.h>
@ -626,35 +627,30 @@ vm86_datacall(intnum, vmf, buffer, buflen, segment, offset)
int buflen;
u_short *segment, *offset;
{
int ret, internb;
int ret;
u_int page;
u_short off;
#define MAX_DATA_SIZE 1024
static u_char mapped_to_page1[MAX_DATA_SIZE * 2];
static u_char *buf;
if (buflen < 0 || buflen > MAX_DATA_SIZE)
if (buflen < 0 || buflen > PAGE_SIZE)
return(-1);
page = (u_int)buffer & PG_FRAME;
*offset = (u_int)buffer & PAGE_MASK;
if ((*offset + buflen) & PG_FRAME) {
if (buf == NULL) {
buf = mapped_to_page1;
off = (u_int)buf & PAGE_MASK;
if ((off + MAX_DATA_SIZE) & PG_FRAME)
buf += PAGE_SIZE - off;
}
page = (u_int)buf & PG_FRAME;
bcopy((void *)buffer, (void *)buf, (size_t)buflen);
internb = 1;
} else
internb = 0;
if (buf == NULL) {
buf = (u_char *)contigmalloc(PAGE_SIZE, M_DEVBUF, M_WAITOK,
0ul, ~0ul, PAGE_SIZE, 0);
if (buf == NULL)
return(-1);
}
*offset = 0;
*segment = 0x100;
bcopy((void *)buffer, (void *)buf, (size_t)buflen);
page = (u_int)buf & PG_FRAME;
page = vtophys(page);
vmf->vmf_trapno = page | (intnum & PAGE_MASK);
ret = vm86_bioscall(vmf);
if (internb)
bcopy((void *)buf, (void *)buffer, (size_t)buflen);
bcopy((void *)buf, (void *)buffer, (size_t)buflen);
return ret;
}