linux-kernel - [PATCH v6 2/5] LoongArch: Add JUMP_VIRT_ADDR macro implementation to avoid using la.abs

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Date:   Wed, 22 Feb 2023 11:16:40 +0800
From:   Youling Tang <tangyouling@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>,
        Xi Ruoyao <xry111@...111.site>,
        Jinyang He <hejinyang@...ngson.cn>
Cc:     Xuerui Wang <kernel@...0n.name>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH v6 2/5] LoongArch: Add JUMP_VIRT_ADDR macro implementation to avoid using la.abs

Add JUMP_VIRT_ADDR macro implementation to avoid using la.abs.

Signed-off-by: Youling Tang <tangyouling@...ngson.cn>
---
 arch/loongarch/include/asm/stackframe.h |  9 +++++++++
 arch/loongarch/kernel/head.S            | 12 ++++--------
 arch/loongarch/power/suspend_asm.S      |  5 ++---
 3 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/arch/loongarch/include/asm/stackframe.h b/arch/loongarch/include/asm/stackframe.h
index 7deb043ce387..855c9d9e3210 100644
--- a/arch/loongarch/include/asm/stackframe.h
+++ b/arch/loongarch/include/asm/stackframe.h
@@ -10,6 +10,7 @@
 #include <asm/asm.h>
 #include <asm/asmmacro.h>
 #include <asm/asm-offsets.h>
+#include <asm/addrspace.h>
 #include <asm/loongarch.h>
 #include <asm/thread_info.h>
 
@@ -216,4 +217,12 @@
 	RESTORE_SP_AND_RET \docfi
 	.endm
 
+/* Jump to the virtual address. */
+	.macro JUMP_VIRT_ADDR temp1 temp2
+	li.d	\temp1, CACHE_BASE
+	pcaddi	\temp2, 0
+	or	\temp1, \temp1, \temp2
+	jirl	zero, \temp1, 0xc
+	.endm
+
 #endif /* _ASM_STACKFRAME_H */
diff --git a/arch/loongarch/kernel/head.S b/arch/loongarch/kernel/head.S
index aa6181714ec3..d2ac26b5b22b 100644
--- a/arch/loongarch/kernel/head.S
+++ b/arch/loongarch/kernel/head.S
@@ -50,11 +50,8 @@ SYM_CODE_START(kernel_entry)			# kernel entry point
 	li.d		t0, CSR_DMW1_INIT	# CA, PLV0, 0x9000 xxxx xxxx xxxx
 	csrwr		t0, LOONGARCH_CSR_DMWIN1
 
-	/* We might not get launched at the address the kernel is linked to,
-	   so we jump there.  */
-	la.abs		t0, 0f
-	jr		t0
-0:
+	JUMP_VIRT_ADDR	t0, t1
+
 	/* Enable PG */
 	li.w		t0, 0xb0		# PLV=0, IE=0, PG=1
 	csrwr		t0, LOONGARCH_CSR_CRMD
@@ -106,9 +103,8 @@ SYM_CODE_START(smpboot_entry)
 	li.d		t0, CSR_DMW1_INIT	# CA, PLV0
 	csrwr		t0, LOONGARCH_CSR_DMWIN1
 
-	la.abs		t0, 0f
-	jr		t0
-0:
+	JUMP_VIRT_ADDR	t0, t1
+
 	/* Enable PG */
 	li.w		t0, 0xb0		# PLV=0, IE=0, PG=1
 	csrwr		t0, LOONGARCH_CSR_CRMD
diff --git a/arch/loongarch/power/suspend_asm.S b/arch/loongarch/power/suspend_asm.S
index eb2675642f9f..90da899c06a1 100644
--- a/arch/loongarch/power/suspend_asm.S
+++ b/arch/loongarch/power/suspend_asm.S
@@ -78,9 +78,8 @@ SYM_INNER_LABEL(loongarch_wakeup_start, SYM_L_GLOBAL)
 	li.d		t0, CSR_DMW1_INIT	# CA, PLV0
 	csrwr		t0, LOONGARCH_CSR_DMWIN1
 
-	la.abs		t0, 0f
-	jr		t0
-0:
+	JUMP_VIRT_ADDR	t0, t1
+
 	la.pcrel	t0, acpi_saved_sp
 	ld.d		sp, t0, 0
 	SETUP_WAKEUP
-- 
2.37.3