diff options
Diffstat (limited to 'arch/mips/include/asm/switch_to.h')
| -rw-r--r-- | arch/mips/include/asm/switch_to.h | 19 |
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 fd16bcb6c31..eb0af15ac65 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(¤t->thread.cp2); \ + write_c0_status(__c0_stat & ~ST0_CU2); \ + } \ if (cpu_has_dsp) \ __restore_dsp(current); \ if (cpu_has_userlocal) \ |