Some work on CSR

emulator/csr.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include <stdint.h>
+
+typedef struct Hart Hart;
+
+#define CSR_CYCLE        0xC00
+#define CSR_CYCLEH       0xC80
+#define CSR_INSTRET      0xC02
+#define CSR_INSTRETH     0xC82
+#define CSR_TIME         0xC01
+#define CSR_TIMEH        0xC81
+
+#define CSR_MVENDORID    0xF11
+#define CSR_MARCHID      0xF12
+#define CSR_MIMPID       0xF13
+#define CSR_MHARTID      0xF14
+
+#define CSR_MISA         0x301
+
+enum CsrAction
+{
+    CSR_R    = 0,
+    CSR_W    = 1,
+    CSR_RW   = 3,
+    CSR_RC   = 5,
+    CSR_RS   = 7,
+};
+
+struct Csr
+{
+    uint32_t (*action)(Hart* hart, uint32_t value_mask, enum CsrAction action);
+};
+typedef struct Csr Csr;
+
+uint32_t csr_action(Hart* hart, uint16_t id, uint32_t value, enum CsrAction action);