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authorMarcelo Tosatti <marcelo.tosatti@cyclades.com>2005-11-05 14:06:24 -0200
committerPaul Mackerras <paulus@samba.org>2005-11-07 12:37:12 +1100
commit55b6332ec89a5fc65d1287708cfd9f06f7a88b90 (patch)
tree12dc1f0a94e222c0577f439e06e49d80cd969f21 /arch/ppc/kernel/traps.c
parentc6d95044a2e124b606b78896a3a2d512e90ef65c (diff)
[PATCH] ppc32: handle access to non-present IO ports on 8xx
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>
Diffstat (limited to 'arch/ppc/kernel/traps.c')
-rw-r--r--arch/ppc/kernel/traps.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/ppc/kernel/traps.c b/arch/ppc/kernel/traps.c
index 16adde6b429..42d980e82bd 100644
--- a/arch/ppc/kernel/traps.c
+++ b/arch/ppc/kernel/traps.c
@@ -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;