[PATCH 1/5] target/loongarch: Add dynamic function access with CSR register

[Bibo Mao]

With CSR register, dynamic function access is used for CSR register
access in TCG mode, so that csr info can be used by other modules.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 .../tcg/insn_trans/trans_privileged.c.inc     | 37 +++++++++++++++++--
 target/loongarch/tcg/tcg_loongarch.h          | 12 ++++++
 target/loongarch/tcg/translate.c              |  3 ++
 3 files changed, 49 insertions(+), 3 deletions(-)
 create mode 100644 target/loongarch/tcg/tcg_loongarch.h

diff --git a/target/loongarch/tcg/insn_trans/trans_privileged.c.inc 
b/target/loongarch/tcg/insn_trans/trans_privileged.c.inc
index 30f9b83fb2..a864a45550 100644
--- a/target/loongarch/tcg/insn_trans/trans_privileged.c.inc
+++ b/target/loongarch/tcg/insn_trans/trans_privileged.c.inc
@@ -76,7 +76,7 @@ enum {
 #define CSR_OFF(NAME) \
     CSR_OFF_FLAGS(NAME, 0)
 
-static const CSRInfo csr_info[] = {
+static CSRInfo csr_info[] = {
     CSR_OFF_FLAGS(CRMD, CSRFL_EXITTB),
     CSR_OFF(PRMD),
     CSR_OFF_FLAGS(EUEN, CSRFL_EXITTB),
@@ -160,9 +160,9 @@ static bool check_plv(DisasContext *ctx)
     return false;
 }
 
-static const CSRInfo *get_csr(unsigned csr_num)
+static CSRInfo *get_csr(unsigned csr_num)
 {
-    const CSRInfo *csr;
+    CSRInfo *csr;
 
     if (csr_num >= ARRAY_SIZE(csr_info)) {
         return NULL;
@@ -174,6 +174,37 @@ static const CSRInfo *get_csr(unsigned csr_num)
     return csr;
 }
 
+static bool set_csr_trans_func(unsigned int csr_num, GenCSRRead readfn,
+                               GenCSRWrite writefn)
+{
+    CSRInfo *csr;
+
+    csr = get_csr(csr_num);
+    if (!csr) {
+        return false;
+    }
+
+    csr->readfn = readfn;
+    csr->writefn = writefn;
+    return true;
+}
+
+#define SET_CSR_FUNC(NAME, read, write)                 \
+        set_csr_trans_func(LOONGARCH_CSR_##NAME, read, write)
+
+void csr_translate_init(void)
+{
+    SET_CSR_FUNC(ESTAT, NULL, gen_helper_csrwr_estat);
+    SET_CSR_FUNC(ASID,  NULL, gen_helper_csrwr_asid);
+    SET_CSR_FUNC(PGD,   gen_helper_csrrd_pgd, NULL);
+    SET_CSR_FUNC(PWCL,  NULL, gen_helper_csrwr_pwcl);
+    SET_CSR_FUNC(CPUID, gen_helper_csrrd_cpuid, NULL);
+    SET_CSR_FUNC(TCFG,  NULL, gen_helper_csrwr_tcfg);
+    SET_CSR_FUNC(TVAL,  gen_helper_csrrd_tval, NULL);
+    SET_CSR_FUNC(TICLR, NULL, gen_helper_csrwr_ticlr);
+}
+#undef SET_CSR_FUNC
+
 static bool check_csr_flags(DisasContext *ctx, const CSRInfo *csr, bool write)
 {
     if ((csr->flags & CSRFL_READONLY) && write) {
diff --git a/target/loongarch/tcg/tcg_loongarch.h 
b/target/loongarch/tcg/tcg_loongarch.h
new file mode 100644
index 0000000000..c2bccc075d
--- /dev/null
+++ b/target/loongarch/tcg/tcg_loongarch.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * QEMU LoongArch TCG interface
+ *
+ * Copyright (c) 2025 Loongson Technology Corporation Limited
+ */
+#ifndef TARGET_LOONGARCH_TCG_LOONGARCH_H
+#define TARGET_LOONGARCH_TCG_LOONGARCH_H
+
+void csr_translate_init(void);
+
+#endif  /* TARGET_LOONGARCH_TCG_LOONGARCH_H */
diff --git a/target/loongarch/tcg/translate.c b/target/loongarch/tcg/translate.c
index 68be999410..b3cd499a97 100644
--- a/target/loongarch/tcg/translate.c
+++ b/target/loongarch/tcg/translate.c
@@ -16,6 +16,7 @@
 #include "exec/log.h"
 #include "qemu/qemu-print.h"
 #include "fpu/softfloat.h"
+#include "tcg_loongarch.h"
 #include "translate.h"
 #include "internals.h"
 #include "vec.h"
@@ -358,4 +359,6 @@ void loongarch_translate_init(void)
                     offsetof(CPULoongArchState, lladdr), "lladdr");
     cpu_llval = tcg_global_mem_new(tcg_env,
                     offsetof(CPULoongArchState, llval), "llval");
+
+    csr_translate_init();
 }
-- 
2.39.3