diff mbox series

[08/22] arm64: mte: Assembler macros and default architecture for .S files

Message ID 20191211184027.20130-9-catalin.marinas@arm.com (mailing list archive)
State New, archived
Headers show
Series arm64: Memory Tagging Extension user-space support | expand

Commit Message

Catalin Marinas Dec. 11, 2019, 6:40 p.m. UTC 
Add the multitag_transfer_size macro to the arm64 assembler.h, together
with '.arch armv8.5-a+memtag' when CONFIG_ARM64_MTE is enabled.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/include/asm/assembler.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index b8cf7c85ffa2..74a649a0b6e6 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -21,8 +21,13 @@ 
 #include <asm/page.h>
 #include <asm/pgtable-hwdef.h>
 #include <asm/ptrace.h>
+#include <asm/sysreg.h>
 #include <asm/thread_info.h>
 
+#ifdef CONFIG_ARM64_MTE
+	.arch armv8.5-a+memtag
+#endif
+
 	.macro save_and_disable_daif, flags
 	mrs	\flags, daif
 	msr	daifset, #0xf
@@ -756,4 +761,15 @@  USER(\label, ic	ivau, \tmp2)			// invalidate I line PoU
 .Lyield_out_\@ :
 	.endm
 
+/*
+ * multitag_transfer_size - set \reg to the block size that is accessed by the
+ * LDGM/STGM instructions.
+ */
+	.macro	multitag_transfer_size, reg, tmp
+	mrs_s	\reg, SYS_GMID_EL1
+	ubfx	\reg, \reg, #SYS_GMID_EL1_BS_SHIFT, #SYS_GMID_EL1_BS_SIZE
+	mov	\tmp, #4
+	lsl	\reg, \tmp, \reg
+	.endm
+
 #endif	/* __ASM_ASSEMBLER_H */