[PATCH v3 4/8] lib: sbi: Detect support of debug triggers

[Himanshu Chauhan]

Detect if debug triggers, sdtrig extension, is supported
by the CPU. The support is detected by access traps and
ISA string parsing.

Signed-off-by: Himanshu Chauhan <hchauhan at ventanamicro.com>
---
 include/sbi/sbi_hart.h | 2 ++
 lib/sbi/sbi_hart.c     | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/include/sbi/sbi_hart.h b/include/sbi/sbi_hart.h
index 47be251..10dc3df 100644
--- a/include/sbi/sbi_hart.h
+++ b/include/sbi/sbi_hart.h
@@ -53,6 +53,8 @@ enum sbi_hart_extensions {
 	SBI_HART_EXT_ZICBOM,
 	/** Hart has Svpbmt extension */
 	SBI_HART_EXT_SVPBMT,
+	/** Hart has debug trigger extension */
+	SBI_HART_EXT_SDTRIG,
 
 	/** Maximum index of Hart extension */
 	SBI_HART_EXT_MAX,
diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c
index 770fee0..a0ab0c6 100644
--- a/lib/sbi/sbi_hart.c
+++ b/lib/sbi/sbi_hart.c
@@ -657,6 +657,7 @@ const struct sbi_hart_ext_data sbi_hart_ext[] = {
 	__SBI_HART_EXT_DATA(zicboz, SBI_HART_EXT_ZICBOZ),
 	__SBI_HART_EXT_DATA(zicbom, SBI_HART_EXT_ZICBOM),
 	__SBI_HART_EXT_DATA(svpbmt, SBI_HART_EXT_SVPBMT),
+	__SBI_HART_EXT_DATA(sdtrig, SBI_HART_EXT_SDTRIG),
 };
 
 /**
@@ -898,6 +899,9 @@ __pmp_skip:
 	/* Detect if hart supports smcntrpmf */
 	__check_ext_csr(SBI_HART_PRIV_VER_1_12,
 			CSR_MCYCLECFG, SBI_HART_EXT_SMCNTRPMF);
+	/* Detect if hart support sdtrig (debug triggers) */
+	__check_ext_csr(SBI_HART_PRIV_VER_UNKNOWN,
+			CSR_TSELECT, SBI_HART_EXT_SDTRIG);
 
 #undef __check_ext_csr
 
-- 
2.34.1