The AIA specification defines IMSIC interface CSRs for easy access
to the per-HART IMSIC registers without using indirect xiselect and
xireg CSRs. This patch implements the AIA IMSIC interface CSRs.
Signed-off-by: Anup Patel <anup.pa...@wdc.com>
---
target/riscv/csr.c | 199 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 199 insertions(+)
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index e72220fd0f..19fe5b76e0 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -865,6 +865,16 @@ static int aia_xlate_vs_csrno(CPURISCVState *env, int
csrno)
return CSR_VSISELECT;
case CSR_SIREG:
return CSR_VSIREG;
+ case CSR_SSETEIPNUM:
+ return CSR_VSSETEIPNUM;
+ case CSR_SCLREIPNUM:
+ return CSR_VSCLREIPNUM;
+ case CSR_SSETEIENUM:
+ return CSR_VSSETEIENUM;
+ case CSR_SCLREIENUM:
+ return CSR_VSCLREIENUM;
+ case CSR_STOPEI:
+ return CSR_VSTOPEI;
default:
return csrno;
};
@@ -1016,6 +1026,174 @@ done:
return RISCV_EXCP_NONE;
}
+static int rmw_xsetclreinum(CPURISCVState *env, int csrno, target_ulong *val,
+ target_ulong new_val, target_ulong wr_mask)
+{
+ int ret = -EINVAL;
+ bool set, pend, virt;
+ target_ulong priv, isel, vgein, nval, wmask;
+
+ /* Translate CSR number for VS-mode */
+ csrno = aia_xlate_vs_csrno(env, csrno);
+
+ /* Decode register details from CSR number */
+ virt = set = pend = false;
+ switch (csrno) {
+ case CSR_MSETEIPNUM:
+ priv = PRV_M;
+ set = true;
+ break;
+ case CSR_MCLREIPNUM:
+ priv = PRV_M;
+ pend = true;
+ break;
+ case CSR_MSETEIENUM:
+ priv = PRV_M;
+ set = true;
+ break;
+ case CSR_MCLREIENUM:
+ priv = PRV_M;
+ break;
+ case CSR_SSETEIPNUM:
+ priv = PRV_S;
+ set = true;
+ pend = true;
+ break;
+ case CSR_SCLREIPNUM:
+ priv = PRV_S;
+ pend = true;
+ break;
+ case CSR_SSETEIENUM:
+ priv = PRV_S;
+ set = true;
+ break;
+ case CSR_SCLREIENUM:
+ priv = PRV_S;
+ break;
+ case CSR_VSSETEIPNUM:
+ priv = PRV_S;
+ virt = true;
+ set = true;
+ pend = true;
+ break;
+ case CSR_VSCLREIPNUM:
+ priv = PRV_S;
+ virt = true;
+ pend = true;
+ break;
+ case CSR_VSSETEIENUM:
+ priv = PRV_S;
+ virt = true;
+ set = true;
+ break;
+ case CSR_VSCLREIENUM:
+ priv = PRV_S;
+ virt = true;
+ break;
+ default:
+ goto done;
+ };
+
+ /* IMSIC CSRs only available when machine implements IMSIC. */
+ if (!env->aia_ireg_rmw_fn[priv]) {
+ goto done;
+ }
+
+ /* Find the selected guest interrupt file */
+ vgein = (virt) ? get_field(env->hstatus, HSTATUS_VGEIN) : 0;
+
+ /* Selected guest interrupt file should be valid */
+ if (virt && (!vgein || env->geilen < vgein)) {
+ goto done;
+ }
+
+ /* Set/Clear CSRs always read zero */
+ if (val) {
+ *val = 0;
+ }
+
+ if (wr_mask) {
+ /* Get interrupt number */
+ new_val &= wr_mask;
+
+ /* Find target interrupt pending/enable register */
+ isel = (new_val / TARGET_LONG_BITS);
+ isel *= (TARGET_LONG_BITS / IMSIC_EIPx_BITS);
+ isel += (pend) ? ISELECT_IMSIC_EIP0 : ISELECT_IMSIC_EIE0;
+
+ /* Find the interrupt bit to be set/clear */
+ wmask = ((target_ulong)1) << (new_val % TARGET_LONG_BITS);
+ nval = (set) ? wmask : 0;
+
+ /* Call machine specific IMSIC register emulation */
+ ret = env->aia_ireg_rmw_fn[priv](env->aia_ireg_rmw_fn_arg[priv],
+ AIA_MAKE_IREG(isel, priv, virt,
vgein),
+ NULL, nval, wmask);
+ } else {
+ ret = 0;
+ }
+
+done:
+ if (ret) {
+ return (riscv_cpu_virt_enabled(env) && virt) ?
+ RISCV_EXCP_VIRT_INSTRUCTION_FAULT : RISCV_EXCP_ILLEGAL_INST;
+ }
+ return RISCV_EXCP_NONE;
+}
+
+static int rmw_xtopei(CPURISCVState *env, int csrno, target_ulong *val,
+ target_ulong new_val, target_ulong wr_mask)
+{
+ bool virt;
+ int ret = -EINVAL;
+ target_ulong priv, vgein;
+
+ /* Translate CSR number for VS-mode */
+ csrno = aia_xlate_vs_csrno(env, csrno);
+
+ /* Decode register details from CSR number */
+ virt = false;
+ switch (csrno) {
+ case CSR_MTOPEI:
+ priv = PRV_M;
+ break;
+ case CSR_STOPEI:
+ priv = PRV_S;
+ break;
+ case CSR_VSTOPEI:
+ priv = PRV_S;
+ virt = true;
+ break;
+ default:
+ goto done;
+ };
+
+ /* IMSIC CSRs only available when machine implements IMSIC. */
+ if (!env->aia_ireg_rmw_fn[priv]) {
+ goto done;
+ }
+
+ /* Find the selected guest interrupt file */
+ vgein = (virt) ? get_field(env->hstatus, HSTATUS_VGEIN) : 0;
+
+ /* Selected guest interrupt file should be valid */
+ if (virt && (!vgein || env->geilen < vgein)) {
+ goto done;
+ }
+
+ /* Call machine specific IMSIC register emulation for TOPEI */
+ ret = env->aia_ireg_rmw_fn[priv](env->aia_ireg_rmw_fn_arg[priv],
+ AIA_MAKE_IREG(ISELECT_IMSIC_TOPEI, priv, virt, vgein),
+ val, new_val, wr_mask);
+
+done:
+ if (ret) {
+ return (riscv_cpu_virt_enabled(env) && virt) ?
+ RISCV_EXCP_VIRT_INSTRUCTION_FAULT : RISCV_EXCP_ILLEGAL_INST;
+ }
+ return RISCV_EXCP_NONE;
+}
+
static RISCVException read_mtvec(CPURISCVState *env, int csrno,
target_ulong *val)
{
@@ -2400,6 +2578,13 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = {
/* Machine-Level Interrupts (AIA) */
[CSR_MTOPI] = { "mtopi", aia_any, read_mtopi },
+ /* Machine-Level IMSIC Interface (AIA) */
+ [CSR_MSETEIPNUM] = { "mseteipnum", aia_any, NULL, NULL, rmw_xsetclreinum },
+ [CSR_MCLREIPNUM] = { "mclreipnum", aia_any, NULL, NULL, rmw_xsetclreinum },
+ [CSR_MSETEIENUM] = { "mseteienum", aia_any, NULL, NULL, rmw_xsetclreinum },
+ [CSR_MCLREIENUM] = { "mclreienum", aia_any, NULL, NULL, rmw_xsetclreinum },
+ [CSR_MTOPEI] = { "mtopei", aia_any, NULL, NULL, rmw_xtopei },
+
/* Virtual Interrupts for Supervisor Level (AIA) */
[CSR_MVIEN] = { "mvien", aia_any, read_zero, write_ignore },
[CSR_MVIP] = { "mvip", aia_any, read_zero, write_ignore },
@@ -2434,6 +2619,13 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = {
/* Supervisor-Level Interrupts (AIA) */
[CSR_STOPI] = { "stopi", aia_smode, read_stopi },
+ /* Supervisor-Level IMSIC Interface (AIA) */
+ [CSR_SSETEIPNUM] = { "sseteipnum", aia_smode, NULL, NULL, rmw_xsetclreinum
},
+ [CSR_SCLREIPNUM] = { "sclreipnum", aia_smode, NULL, NULL, rmw_xsetclreinum
},
+ [CSR_SSETEIENUM] = { "sseteienum", aia_smode, NULL, NULL, rmw_xsetclreinum
},
+ [CSR_SCLREIENUM] = { "sclreienum", aia_smode, NULL, NULL, rmw_xsetclreinum
},
+ [CSR_STOPEI] = { "stopei", aia_smode, NULL, NULL, rmw_xtopei },
+
/* Supervisor-Level High-Half CSRs (AIA) */
[CSR_SIEH] = { "sieh", aia_smode32, NULL, NULL, rmw_sieh },
[CSR_SIPH] = { "siph", aia_smode32, NULL, NULL, rmw_siph },
@@ -2479,6 +2671,13 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = {
/* VS-Level Interrupts (H-extension with AIA) */
[CSR_VSTOPI] = { "vstopi", aia_hmode, read_vstopi },
+ /* VS-Level IMSIC Interface (H-extension with AIA) */
+ [CSR_VSSETEIPNUM] = { "vsseteipnum", aia_hmode, NULL, NULL,
rmw_xsetclreinum },
+ [CSR_VSCLREIPNUM] = { "vsclreipnum", aia_hmode, NULL, NULL,
rmw_xsetclreinum },
+ [CSR_VSSETEIENUM] = { "vsseteienum", aia_hmode, NULL, NULL,
rmw_xsetclreinum },
+ [CSR_VSCLREIENUM] = { "vsclreienum", aia_hmode, NULL, NULL,
rmw_xsetclreinum },
+ [CSR_VSTOPEI] = { "vstopei", aia_hmode, NULL, NULL, rmw_xtopei },
+
/* Hypervisor and VS-Level High-Half CSRs (H-extension with AIA) */
[CSR_HIDELEGH] = { "hidelegh", aia_hmode32, NULL, NULL, rmw_hidelegh
},
[CSR_HVIENH] = { "hvienh", aia_hmode32, read_zero, write_ignore
},
--
2.25.1
