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[PATCH] ppc32: handle access to non-present IO ports on 8xx

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This adds exception table entries for I/O instructions on and
changes MachineCheckException() slightly to cover 8xx specifics (on
8xx the MCE can be generated while executing the IO access instruction
itself, which is not the case on PowerMac's, as the comment on traps.c
details).

Signed-off-by: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Marcelo Tosatti
2005-11-05 14:06:24 -02:00
committed by Paul Mackerras
parent c6d95044a2
commit 55b6332ec8
3 changed files with 138 additions and 27 deletions
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8
arch/ppc/kernel/traps.c
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@@ -159,7 +159,7 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
*/
static inline int check_io_access(struct pt_regs *regs)
{
#ifdef CONFIG_PPC_PMAC
#if defined CONFIG_PPC_PMAC || defined CONFIG_8xx
unsigned long msr = regs->msr;
const struct exception_table_entry *entry;
unsigned int *nip = (unsigned int *)regs->nip;
@@ -178,7 +178,11 @@ static inline int check_io_access(struct pt_regs *regs)
nip -= 2;
else if (*nip == 0x4c00012c) /* isync */
--nip;
if (*nip == 0x7c0004ac || (*nip >> 26) == 3) {
/* eieio from I/O string functions */
else if ((*nip) == 0x7c0006ac || *(nip+1) == 0x7c0006ac)
nip += 2;
if (*nip == 0x7c0004ac || (*nip >> 26) == 3 ||
(*(nip+1) >> 26) == 3) {
/* sync or twi */
unsigned int rb;