1 files changed, 129 insertions, 0 deletions
diff --git a/target/loongarch/csr.c b/target/loongarch/csr.c
new file mode 100644
index 0000000000..7ea0a30450
--- /dev/null
+++ b/target/loongarch/csr.c
@@ -0,0 +1,129 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2025 Loongson Technology Corporation Limited
+ */
+#include <stddef.h>
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "csr.h"
+
+#define CSR_OFF_FUNCS(NAME, FL, RD, WR)                    \
+    [LOONGARCH_CSR_##NAME] = {                             \
+        .name   = (stringify(NAME)),                       \
+        .offset = offsetof(CPULoongArchState, CSR_##NAME), \
+        .flags = FL, .readfn = RD, .writefn = WR           \
+    }
+
+#define CSR_OFF_ARRAY(NAME, N)                                \
+    [LOONGARCH_CSR_##NAME(N)] = {                             \
+        .name   = (stringify(NAME##N)),                       \
+        .offset = offsetof(CPULoongArchState, CSR_##NAME[N]), \
+        .flags = 0, .readfn = NULL, .writefn = NULL           \
+    }
+
+#define CSR_OFF_FLAGS(NAME, FL)   CSR_OFF_FUNCS(NAME, FL, NULL, NULL)
+#define CSR_OFF(NAME)             CSR_OFF_FLAGS(NAME, 0)
+
+static CSRInfo csr_info[] = {
+    CSR_OFF_FLAGS(CRMD, CSRFL_EXITTB),
+    CSR_OFF(PRMD),
+    CSR_OFF_FLAGS(EUEN, CSRFL_EXITTB),
+    CSR_OFF_FLAGS(MISC, CSRFL_READONLY),
+    CSR_OFF(ECFG),
+    CSR_OFF_FLAGS(ESTAT, CSRFL_EXITTB),
+    CSR_OFF(ERA),
+    CSR_OFF(BADV),
+    CSR_OFF_FLAGS(BADI, CSRFL_READONLY),
+    CSR_OFF(EENTRY),
+    CSR_OFF(TLBIDX),
+    CSR_OFF(TLBEHI),
+    CSR_OFF(TLBELO0),
+    CSR_OFF(TLBELO1),
+    CSR_OFF_FLAGS(ASID, CSRFL_EXITTB),
+    CSR_OFF(PGDL),
+    CSR_OFF(PGDH),
+    CSR_OFF_FLAGS(PGD, CSRFL_READONLY),
+    CSR_OFF(PWCL),
+    CSR_OFF(PWCH),
+    CSR_OFF(STLBPS),
+    CSR_OFF(RVACFG),
+    CSR_OFF_FLAGS(CPUID, CSRFL_READONLY),
+    CSR_OFF_FLAGS(PRCFG1, CSRFL_READONLY),
+    CSR_OFF_FLAGS(PRCFG2, CSRFL_READONLY),
+    CSR_OFF_FLAGS(PRCFG3, CSRFL_READONLY),
+    CSR_OFF_ARRAY(SAVE, 0),
+    CSR_OFF_ARRAY(SAVE, 1),
+    CSR_OFF_ARRAY(SAVE, 2),
+    CSR_OFF_ARRAY(SAVE, 3),
+    CSR_OFF_ARRAY(SAVE, 4),
+    CSR_OFF_ARRAY(SAVE, 5),
+    CSR_OFF_ARRAY(SAVE, 6),
+    CSR_OFF_ARRAY(SAVE, 7),
+    CSR_OFF_ARRAY(SAVE, 8),
+    CSR_OFF_ARRAY(SAVE, 9),
+    CSR_OFF_ARRAY(SAVE, 10),
+    CSR_OFF_ARRAY(SAVE, 11),
+    CSR_OFF_ARRAY(SAVE, 12),
+    CSR_OFF_ARRAY(SAVE, 13),
+    CSR_OFF_ARRAY(SAVE, 14),
+    CSR_OFF_ARRAY(SAVE, 15),
+    CSR_OFF(TID),
+    CSR_OFF_FLAGS(TCFG, CSRFL_IO),
+    CSR_OFF_FLAGS(TVAL, CSRFL_READONLY | CSRFL_IO),
+    CSR_OFF(CNTC),
+    CSR_OFF_FLAGS(TICLR, CSRFL_IO),
+    CSR_OFF(LLBCTL),
+    CSR_OFF(IMPCTL1),
+    CSR_OFF(IMPCTL2),
+    CSR_OFF(TLBRENTRY),
+    CSR_OFF(TLBRBADV),
+    CSR_OFF(TLBRERA),
+    CSR_OFF(TLBRSAVE),
+    CSR_OFF(TLBRELO0),
+    CSR_OFF(TLBRELO1),
+    CSR_OFF(TLBREHI),
+    CSR_OFF(TLBRPRMD),
+    CSR_OFF(MERRCTL),
+    CSR_OFF(MERRINFO1),
+    CSR_OFF(MERRINFO2),
+    CSR_OFF(MERRENTRY),
+    CSR_OFF(MERRERA),
+    CSR_OFF(MERRSAVE),
+    CSR_OFF(CTAG),
+    CSR_OFF_ARRAY(DMW, 0),
+    CSR_OFF_ARRAY(DMW, 1),
+    CSR_OFF_ARRAY(DMW, 2),
+    CSR_OFF_ARRAY(DMW, 3),
+    CSR_OFF(DBG),
+    CSR_OFF(DERA),
+    CSR_OFF(DSAVE),
+};
+
+CSRInfo *get_csr(unsigned int csr_num)
+{
+    CSRInfo *csr;
+
+    if (csr_num >= ARRAY_SIZE(csr_info)) {
+        return NULL;
+    }
+
+    csr = &csr_info[csr_num];
+    if (csr->offset == 0) {
+        return NULL;
+    }
+
+    return csr;
+}
+
+bool set_csr_flag(unsigned int csr_num, int flag)
+{
+    CSRInfo *csr;
+
+    csr = get_csr(csr_num);
+    if (!csr) {
+        return false;
+    }
+
+    csr->flags |= flag;
+    return true;
+}