>>>>> On Fri, 26 Oct 2001 22:58:06 +0900 (JST), Atsushi Nemoto <nemoto@toshiba-tops.co.jp> said:
nemoto> I have seen TX39 dead on "cfc1" insturuction if STATUS.CU1 bit
nemoto> enabled. Such codes were in arch/mips/kernel/process.c.
So, please apply this patch to CVS for TX39XX support.
I use CONFIG_CPU_TX39XX in this patch, but I suppose other FPU-less
CPUs may need this also.
Does anybody know how about on other CPUs?
diff -u linux-sgi-cvs/arch/mips/kernel/process.c linux.new/arch/mips/kernel/
--- linux-sgi-cvs/arch/mips/kernel/process.c Mon Oct 22 10:29:56 2001
+++ linux.new/arch/mips/kernel/process.c Mon Oct 29 15:49:37 2001
@@ -57,6 +57,12 @@
{
/* Forget lazy fpu state */
if (last_task_used_math == current) {
+#ifdef CONFIG_CPU_TX39XX
+ if (!(mips_cpu.options & MIPS_CPU_FPU)) {
+ last_task_used_math = NULL;
+ return;
+ }
+#endif
set_cp0_status(ST0_CU1);
__asm__ __volatile__("cfc1\t$0,$31");
last_task_used_math = NULL;
@@ -67,6 +73,12 @@
{
/* Forget lazy fpu state */
if (last_task_used_math == current) {
+#ifdef CONFIG_CPU_TX39XX
+ if (!(mips_cpu.options & MIPS_CPU_FPU)) {
+ last_task_used_math = NULL;
+ return;
+ }
+#endif
set_cp0_status(ST0_CU1);
__asm__ __volatile__("cfc1\t$0,$31");
last_task_used_math = NULL;
---
Atsushi Nemoto
