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MIPS: Move cop2 save/restore to switch_to()

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Move the common code for saving and restoring platform specific COP2
registers to switch_to(). This will make supporting new platforms (like
Netlogic XLP) easier.

The platform specific COP2 definitions are to be specified in
asm/processor.h and in asm/cop2.h.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Cc: ddaney.cavm@gmail.com
Patchwork: https://patchwork.linux-mips.org/patch/5411/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Jayachandran C
2013-06-10 06:30:00 +00:00
committed by Ralf Baechle
parent 79f8511c83
commit 2c952e06e4
4 changed files with 44 additions and 39 deletions
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19
arch/mips/include/asm/switch_to.h
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@@ -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) \