korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-12 05:48:39 +08:00
Code Issues Packages Projects Releases Wiki Activity

MIPS: context switch: Use save/restore instead of set/clear for Status.CU2

Browse Source 
Some processors (such as Loongson-3) need to enable CU2 in kernel mode,
current set/clear method will lose Status.CU2 during context switching,
so use save/restore method instead.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Huacai Chen 2020-09-21 17:12:26 +08:00 committed by Thomas Bogendoerfer
parent 6fa573a3e3
commit 4e43e5df58
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/mips/include/asm/switch_to.h
View File

@ -117,6 +117,8 @@ do { \
__restore_dsp(next); \
} \
if (cop2_present) { \
u32 status = read_c0_status(); \
\
set_c0_status(ST0_CU2); \
if ((KSTK_STATUS(prev) & ST0_CU2)) { \
if (cop2_lazy_restore) \
@ -127,7 +129,7 @@ do { \
!cop2_lazy_restore) { \
cop2_restore(next); \
} \
clear_c0_status(ST0_CU2); \
write_c0_status(status); \
} \
__clear_r5_hw_ll_bit(); \
__clear_software_ll_bit(); \