Commit 12f8311e authored by Jun Yi's avatar Jun Yi Committed by Hongchen Zhang
Browse files

LoongArch: Remove redudant csr save/restore 

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6BWFP



--------------------------------

Signed-off-by: default avatarJun Yi <yijun@loongson.cn>
Change-Id: Ib034b577cbebbbe56e936bf541348db271c2a9db
parent f0c990f8

arch/loongarch/include/asm/stackframe.h

+0 −9
Original line number Diff line number Diff line
@@ -114,14 +114,6 @@ 
	LONG_S	zero, sp, PT_R0

	csrrd	t0, LOONGARCH_CSR_PRMD

	LONG_S	t0, sp, PT_PRMD

	csrrd	t0, LOONGARCH_CSR_CRMD

	LONG_S	t0, sp, PT_CRMD

	csrrd	t0, LOONGARCH_CSR_EUEN

	LONG_S  t0, sp, PT_EUEN

	csrrd	t0, LOONGARCH_CSR_ECFG

	LONG_S	t0, sp, PT_ECFG

	csrrd	t0, LOONGARCH_CSR_ESTAT

	PTR_S	t0, sp, PT_ESTAT

	cfi_st	ra, PT_R1, \docfi

	cfi_st	a0, PT_R4, \docfi

	cfi_st	a1, PT_R5, \docfi
@@ -140,7 +132,6 @@ 
	cfi_st	fp, PT_R22, \docfi



	/* Set thread_info if we're coming from user mode */

	csrrd	t0, LOONGARCH_CSR_PRMD

	andi	t0, t0, 0x3	/* extract pplv bit */

	beqz	t0, 9f

arch/loongarch/kernel/entry.S

+0 −8
Original line number Diff line number Diff line
@@ -31,14 +31,6 @@ SYM_FUNC_START(handle_syscall) 
	st.d	zero, sp, PT_R0

	csrrd	t2, LOONGARCH_CSR_PRMD

	st.d	t2, sp, PT_PRMD

	csrrd	t2, LOONGARCH_CSR_CRMD

	st.d	t2, sp, PT_CRMD

	csrrd	t2, LOONGARCH_CSR_EUEN

	st.d	t2, sp, PT_EUEN

	csrrd	t2, LOONGARCH_CSR_ECFG

	st.d	t2, sp, PT_ECFG

	csrrd	t2, LOONGARCH_CSR_ESTAT

	st.d	t2, sp, PT_ESTAT

	cfi_st	ra, PT_R1

	cfi_st	a0, PT_R4

	cfi_st	a1, PT_R5

arch/loongarch/kernel/switch.S

+0 −6
Original line number Diff line number Diff line
@@ -16,9 +16,6 @@ 
 */

	.align	5

SYM_FUNC_START(__switch_to)

	csrrd	t1, LOONGARCH_CSR_PRMD

	stptr.d	t1, a0, THREAD_CSRPRMD



	cpu_save_nonscratch a0

	stptr.d	ra, a0, THREAD_REG01

	stptr.d a3, a0, THREAD_SCHED_RA
@@ -30,8 +27,5 @@ SYM_FUNC_START(__switch_to) 
	PTR_ADD		t0, t0, tp

	set_saved_sp	t0, t1, t2



	ldptr.d	t1, a1, THREAD_CSRPRMD

	csrwr	t1, LOONGARCH_CSR_PRMD



	jr	ra

SYM_FUNC_END(__switch_to)