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[05/11,v2] target/riscv: Update CSR xip in CLIC mode

Message ID 20240819160742.27586-9-Ian.Brockbank@cirrus.com (mailing list archive)
State New
Headers show
Series RISC-V: support CLIC v0.9 specification | expand

Commit Message

Ian Brockbank Aug. 19, 2024, 4:02 p.m. UTC 
From: Ian Brockbank <ian.brockbank@cirrus.com>

The xip CSR appears hardwired to zero in CLIC mode, replaced by separate
memory-mapped interrupt pendings (clicintip[i]). Writes to xip will be
ignored and will not trap (i.e., no access faults).

Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Signed-off-by: Ian Brockbank <ian.brockbank@cirrus.com>
---
 target/riscv/csr.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

--
2.46.0.windows.1
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diff mbox series

Patch

diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index a5978e0929..276ef7856e 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -2743,6 +2743,12 @@  static RISCVException rmw_mip(CPURISCVState *env, int csrno,
     uint64_t rval;
     RISCVException ret;

+    /* The xip CSR appears hardwired to zero in CLIC mode. */
+    if (riscv_clic_is_clic_mode(env)) {
+        *ret_val = 0;
+        return RISCV_EXCP_NONE;
+    }
+
     ret = rmw_mip64(env, csrno, &rval, new_val, wr_mask);
     if (ret_val) {
         *ret_val = rval;
@@ -3294,6 +3300,12 @@  static RISCVException rmw_sip64(CPURISCVState *env, int csrno,
         }
         ret = rmw_vsip64(env, CSR_VSIP, ret_val, new_val, wr_mask);
     } else {
+        /* The xip CSR appears hardwired to zero in CLIC mode. */
+        if (riscv_clic_is_clic_mode(env)) {
+            *ret_val = 0;
+            return RISCV_EXCP_NONE;
+        }
+
         ret = rmw_mvip64(env, csrno, ret_val, new_val, wr_mask & mask);
     }