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Have working bus_peek(), and drivers use it.

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gwr 1994-12-13 18:37:22 +00:00
parent 10e46730cf
commit ee61fc716b
1 changed files with 47 additions and 38 deletions
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85
sys/arch/sun3/sun3/autoconf.c
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@ -1,4 +1,4 @@
/* $NetBSD: autoconf.c,v 1.17 1994/12/12 18:59:56 gwr Exp $ */
/* $NetBSD: autoconf.c,v 1.18 1994/12/13 18:37:22 gwr Exp $ */
/*
* Copyright (c) 1994 Gordon W. Ross
@ -49,13 +49,15 @@
#include <sys/dmap.h>
#include <sys/reboot.h>
#include <machine/autoconf.h>
#include <machine/vmparam.h>
#include <machine/cpu.h>
#include <machine/pte.h>
#include <machine/isr.h>
#include <vm/vm.h>
#include <vm/vm_kern.h>
#include <vm/vm_map.h>
#include <setjmp.h>
#include <machine/autoconf.h>
#include <machine/cpu.h>
#include <machine/isr.h>
#include <machine/pte.h>
#include <machine/pmap.h>
extern int soft1intr();
@ -207,69 +209,76 @@ bus_print(args, name)
/*
* Read addr with size len (1,2,4) into val.
* If this generates a bus error, return non-zero.
* If this generates a bus error, return -1
*
* Create a temporary mapping,
* Prepare for bus-error with setjmp,
* Try the access,
* Try the access using fu{byte,sword,word}
* Clean up temp. mapping
*/
extern caddr_t vmempage;
int bus_peek(ca, off, len, val)
struct confargs *ca;
int off, len;
int *val;
extern vm_offset_t tmp_vpages[];
extern int fubyte(), fusword(), fuword();
int bus_peek(bustype, paddr, sz)
int bustype, paddr, sz;
{
#if 0 /* XXX - Not yet. */
int rv, x, ptype;
vm_offset_t va, pa;
int off, pte, rv, s;
vm_offset_t pgva;
caddr_t va;
switch (ca->ca_bustype) {
off = paddr & PGOFSET;
paddr -= off;
pte = PA_PGNUM(paddr);
/*
* The temporary mapping has user-accessibility
* because fubyte et. al. do the access using
* an explicit switch to user space...
* (XXX -Should see if fubyte still needs that.)
*/
#define PG_PEEK PG_VALID | PG_WRITE | PG_NC
switch (bustype) {
case BUS_OBMEM:
ptype = PMAP_NC;
pte |= (PG_PEEK | PGT_OBMEM);
break;
case BUS_OBIO:
ptype = PMAP_NC | PMAP_OBIO;
pte |= (PG_PEEK | PGT_OBIO);
break;
case BUS_VME16:
ptype = PMAP_NC | PMAP_VME16;
pte |= (PG_PEEK | PGT_VME_D16);
break;
case BUS_VME32:
ptype = PMAP_NC | PMAP_VME32;
pte |= (PG_PEEK | PGT_VME_D32);
break;
default:
return (-1);
}
#undef PG_PEEK
pa = ca->ca_paddr + off;
off = pa & PGOFSET;
pa -= off;
pa |= ptype;
va = vmempage + off;
s = splvm();
pmap_enter(kernel_pmap, vmempage, pa,
VM_PROT_WRITE, TRUE);
pgva = tmp_vpages[0];
va = (caddr_t)pgva + off;
set_pte(pgva, pte);
/*
* OK, try the access using one of the assembly routines
* that will set pcb_onfault and catch any bus errors.
*/
switch (len) {
switch (sz) {
case 1:
rv = peekb(va, &x);
rv = fubyte(va);
break;
case 2:
rv = peeks(va, &x);
rv = fusword(va);
break;
case 4:
rv = peekl(va, &x);
rv = fuword(va);
break;
default:
rv = -1;
}
pmap_remove(kernel_pmap, vmempage, vmempage + NBPG);
#endif
return 0;
set_pte(pgva, PG_INVAL);
splx(s);
return rv;
}