Commit 38c52459 authored by Mao Minkai's avatar Mao Minkai Committed by guzitao
Browse files

sw64: optimize hmcall rdusp() and wrusp() 

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8CCPO



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

Remove the unnecessary memory barrier and instruction barrier.

Signed-off-by: default avatarMao Minkai <maominkai@wxiat.com>
Reviewed-by: default avatarHe Sheng <hesheng@wxiat.com>
Signed-off-by: default avatarGu Zitao <guzitao@wxiat.com>
parent 1a8e5712

arch/sw_64/kernel/hmcall.c

+18 −0
Original line number Diff line number Diff line
@@ -92,6 +92,22 @@ static inline void fixup_wrktp(void) 
	entry[1] = 0x1ee00000;	/* pri_ret $23 */

}



static inline void fixup_rdusp(void)

{

	unsigned int *entry = __va(HMCALL_ENTRY(rdusp));



	entry[0] = 0x94161018;	/* pri_ldl/p $0, VC__USP(vcpucb) */

	entry[1] = 0x1ee00000;	/* pri_ret $23 */

}



static inline void fixup_wrusp(void)

{

	unsigned int *entry = __va(HMCALL_ENTRY(wrusp));



	entry[0] = 0xb6161018;	/* pri_stl/p $16, VC__USP(vcpucb) */

	entry[1] = 0x1ee00000;	/* pri_ret $23 */

}



void __init fixup_hmcall(void)

{

#if defined(CONFIG_SUBARCH_C3B)
@@ -101,6 +117,8 @@ void __init fixup_hmcall(void) 
	fixup_wrasid();

	fixup_rdktp();

	fixup_wrktp();

	fixup_rdusp();

	fixup_wrusp();

	imemb();

#endif

}