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Diffstat (limited to 'arch/mips/include/asm/switch_to.h')
-rw-r--r--arch/mips/include/asm/switch_to.h19
1 files changed, 18 insertions, 1 deletions
diff --git a/arch/mips/include/asm/switch_to.h b/arch/mips/include/asm/switch_to.h
index fd16bcb6c311..eb0af15ac656 100644
--- a/arch/mips/include/asm/switch_to.h
+++ b/arch/mips/include/asm/switch_to.h
@@ -15,6 +15,7 @@
#include <asm/cpu-features.h>
#include <asm/watch.h>
#include <asm/dsp.h>
+#include <asm/cop2.h>
struct task_struct;
@@ -66,10 +67,18 @@ do { \
#define switch_to(prev, next, last) \
do { \
- u32 __usedfpu; \
+ u32 __usedfpu, __c0_stat; \
__mips_mt_fpaff_switch_to(prev); \
if (cpu_has_dsp) \
__save_dsp(prev); \
+ if (cop2_present && (KSTK_STATUS(prev) & ST0_CU2)) { \
+ if (cop2_lazy_restore) \
+ KSTK_STATUS(prev) &= ~ST0_CU2; \
+ __c0_stat = read_c0_status(); \
+ write_c0_status(__c0_stat | ST0_CU2); \
+ cop2_save(&prev->thread.cp2); \
+ write_c0_status(__c0_stat & ~ST0_CU2); \
+ } \
__clear_software_ll_bit(); \
__usedfpu = test_and_clear_tsk_thread_flag(prev, TIF_USEDFPU); \
(last) = resume(prev, next, task_thread_info(next), __usedfpu); \
@@ -77,6 +86,14 @@ do { \
#define finish_arch_switch(prev) \
do { \
+ u32 __c0_stat; \
+ if (cop2_present && !cop2_lazy_restore && \
+ (KSTK_STATUS(current) & ST0_CU2)) { \
+ __c0_stat = read_c0_status(); \
+ write_c0_status(__c0_stat | ST0_CU2); \
+ cop2_restore(&current->thread.cp2); \
+ write_c0_status(__c0_stat & ~ST0_CU2); \
+ } \
if (cpu_has_dsp) \
__restore_dsp(current); \
if (cpu_has_userlocal) \