[PATCH v2 7/8] lib: sbi_hart: add Ssstateen extension

[Radim Krčmář]

We already detect Smstateen, but Ssstateen exists as well and it doesn't
have the M-state CSRs.

Reviewed-by: Anup Patel <anup at brainfault.org>
Signed-off-by: Radim Krčmář <rkrcmar at ventanamicro.com>
---
v2:
* Improve comments. [Anup]
* Add Reviewed-by [Anup]
---
 include/sbi/sbi_hart.h | 4 +++-
 lib/sbi/sbi_hart.c     | 4 ++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/sbi/sbi_hart.h b/include/sbi/sbi_hart.h
index c3a7feb753d9..bce88c5984f4 100644
--- a/include/sbi/sbi_hart.h
+++ b/include/sbi/sbi_hart.h
@@ -31,7 +31,7 @@ enum sbi_hart_extensions {
 	SBI_HART_EXT_SMAIA = 0,
 	/** HART has Smepmp */
 	SBI_HART_EXT_SMEPMP,
-	/** HART has Smstateen CSR **/
+	/** HART has Smstateen extension **/
 	SBI_HART_EXT_SMSTATEEN,
 	/** Hart has Sscofpmt extension */
 	SBI_HART_EXT_SSCOFPMF,
@@ -79,6 +79,8 @@ enum sbi_hart_extensions {
 	SBI_HART_EXT_SMCTR,
 	/** HART has CTR S-mode CSRs */
 	SBI_HART_EXT_SSCTR,
+	/** HART has Ssstateen extension **/
+	SBI_HART_EXT_SSSTATEEN,
 
 	/** Maximum index of Hart extension */
 	SBI_HART_EXT_MAX,
diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c
index c6a779490c70..8dc61d6ff230 100644
--- a/lib/sbi/sbi_hart.c
+++ b/lib/sbi/sbi_hart.c
@@ -695,6 +695,7 @@ const struct sbi_hart_ext_data sbi_hart_ext[] = {
 	__SBI_HART_EXT_DATA(ssdbltrp, SBI_HART_EXT_SSDBLTRP),
 	__SBI_HART_EXT_DATA(smctr, SBI_HART_EXT_SMCTR),
 	__SBI_HART_EXT_DATA(ssctr, SBI_HART_EXT_SSCTR),
+	__SBI_HART_EXT_DATA(ssstateen, SBI_HART_EXT_SSSTATEEN),
 };
 
 _Static_assert(SBI_HART_EXT_MAX == array_size(sbi_hart_ext),
@@ -940,6 +941,9 @@ __pmp_skip:
 	/* Detect if hart supports mstateen CSRs */
 	__check_ext_csr(SBI_HART_PRIV_VER_1_12,
 			CSR_MSTATEEN0, SBI_HART_EXT_SMSTATEEN);
+	/* Detect if hart supports sstateen CSRs */
+	__check_ext_csr(SBI_HART_PRIV_VER_1_12,
+			CSR_SSTATEEN0, SBI_HART_EXT_SSSTATEEN);
 	/* Detect if hart supports smcntrpmf */
 	__check_ext_csr(SBI_HART_PRIV_VER_1_12,
 			CSR_MCYCLECFG, SBI_HART_EXT_SMCNTRPMF);
-- 
2.48.1