[RFC PATCH v1 1/3] lib: sbi: Add Smstateen extension defines

[Mayuresh Chitale]

Smstateen extension provides a mechanism to plug potential
covert channels which are opened by extensions that add to
processor state that may not get context-switched.

Signed-off-by: Mayuresh Chitale <mchitale at ventanamicro.com>
---
 include/sbi/riscv_encoding.h | 37 ++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/include/sbi/riscv_encoding.h b/include/sbi/riscv_encoding.h
index cce66dd..fefd3de 100644
--- a/include/sbi/riscv_encoding.h
+++ b/include/sbi/riscv_encoding.h
@@ -337,6 +337,12 @@
 #define CSR_SIEH			0x114
 #define CSR_SIPH			0x154
 
+/* Supervisor stateen CSRs */
+#define CSR_SSTATEEN0       0x10C
+#define CSR_SSTATEEN1       0x10D
+#define CSR_SSTATEEN2       0x10E
+#define CSR_SSTATEEN3       0x10F
+
 /* ===== Hypervisor-level CSRs ===== */
 
 /* Hypervisor Trap Setup (H-extension) */
@@ -401,6 +407,16 @@
 #define CSR_VSIEH			0x214
 #define CSR_VSIPH			0x254
 
+/* Hypervisor stateen CSRs */
+#define CSR_HSTATEEN0       0x60C
+#define CSR_HSTATEEN0H      0x61C
+#define CSR_HSTATEEN1       0x60D
+#define CSR_HSTATEEN1H      0x61D
+#define CSR_HSTATEEN2       0x60E
+#define CSR_HSTATEEN2H      0x61E
+#define CSR_HSTATEEN3       0x60F
+#define CSR_HSTATEEN3H      0x61F
+
 /* ===== Machine-level CSRs ===== */
 
 /* Machine Information Registers */
@@ -674,6 +690,17 @@
 #define CSR_MVIEN			0x308
 #define CSR_MVIP			0x309
 
+/* Smstateen extension registers */
+/* Machine stateen CSRs */
+#define CSR_MSTATEEN0       0x30C
+#define CSR_MSTATEEN0H      0x31C
+#define CSR_MSTATEEN1       0x30D
+#define CSR_MSTATEEN1H      0x31D
+#define CSR_MSTATEEN2       0x30E
+#define CSR_MSTATEEN2H      0x31E
+#define CSR_MSTATEEN3       0x30F
+#define CSR_MSTATEEN3H      0x31F
+
 /* Machine-Level High-Half CSRs (AIA) */
 #define CSR_MIDELEGH			0x313
 #define CSR_MIEH			0x314
@@ -703,6 +730,16 @@
 #define CAUSE_VIRTUAL_INST_FAULT	0x16
 #define CAUSE_STORE_GUEST_PAGE_FAULT	0x17
 
+/* Common defines for all smstateen */
+#define SMSTATEEN_MAX_COUNT 4
+#define SMSTATEEN0_CS       0
+#define SMSTATEEN0_FCSR     0
+#define SMSTATEEN0_IMSIC    58
+#define SMSTATEEN0_AIA      59
+#define SMSTATEEN0_SVSLCT   60
+#define SMSTATEEN0_HSENVCFG 62
+#define SMSTATEEN_STATEN    63
+
 /* ===== Instruction Encodings ===== */
 
 #define INSN_MATCH_LB			0x3
-- 
2.17.1