refine description of siselect

riscv · Oct 8, 2023 · a585efc · a585efc
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diff --git a/rv-spmp-spec.pdf b/rv-spmp-spec.pdf
diff --git a/spmp_spec.adoc b/spmp_spec.adoc
@@ -208,34 +208,38 @@ image::SPMP_domain_switch_register_format.svg[title="SPMP domain switch register
 
 
 === Access Methods of SPMP CSRs
-*Indirect CSR access*: The SPMP support indirect CSR access if the `Sscsrind` extension is implemented.
+How SPMP CSRs are accessed depends on whether the the `Sscsrind` extension is implemented or not.
+
+*Indirect CSR access*: The SPMP supports indirect CSR access if the `Sscsrind` extension is implemented.
 The `Sscsrind` defines 1 select CSR (`siselect`) and 6 alias CSRs (`sireg[i]`).
-The each combination of `siselect` and `sireg[i]` standards for an access of corresponding SPMP CSR.
+Each combination of `siselect` and `sireg[i]` represents an access to the corresponding SPMP CSR.
 
 [cols="^1,^2",stripes=even, options="header"]
 |===
 |siselect number|indirect CSR access of sireg[i]
-|0x1a0|sireg[1-6] -> spmpcfg[0-5]
-|0x1a1|sireg[1-6] -> spmpcfg[6-11]
-|0x1a2|sireg[1-4] -> spmpcfg[12-15]
-|0x1a3|sireg[1-6] -> spmpaddr[0-5]
-|0x1a4|sireg[1-6] -> spmpaddr[6-11]
-|0x1a5|sireg[1-6] -> spmpaddr[12-17]
-|0x1a6|sireg[1-6] -> spmpaddr[18-23]
-|0x1a7|sireg[1-6] -> spmpaddr[24-29]
-|0x1a8|sireg[1-6] -> spmpaddr[30-35]
-|0x1a9|sireg[1-6] -> spmpaddr[36-41]
-|0x1aa|sireg[1-6] -> spmpaddr[42-47]
-|0x1ab|sireg[1-6] -> spmpaddr[48-53]
-|0x1ac|sireg[1-6] -> spmpaddr[54-59]
-|0x1ad|sireg[1-4] -> spmpaddr[60-63]
-|0x1ae|sireg[1-2] -> spmpswitch[0-1]
+|siselect#1|sireg[1-6] -> spmpcfg[0-5]
+|siselect#2|sireg[1-6] -> spmpcfg[6-11]
+|siselect#3|sireg[1-4] -> spmpcfg[12-15]
+|siselect#4|sireg[1-6] -> spmpaddr[0-5]
+|siselect#5|sireg[1-6] -> spmpaddr[6-11]
+|siselect#6|sireg[1-6] -> spmpaddr[12-17]
+|siselect#7|sireg[1-6] -> spmpaddr[18-23]
+|siselect#8|sireg[1-6] -> spmpaddr[24-29]
+|siselect#9|sireg[1-6] -> spmpaddr[30-35]
+|siselect#10|sireg[1-6] -> spmpaddr[36-41]
+|siselect#11|sireg[1-6] -> spmpaddr[42-47]
+|siselect#12|sireg[1-6] -> spmpaddr[48-53]
+|siselect#13|sireg[1-6] -> spmpaddr[54-59]
+|siselect#14|sireg[1-4] -> spmpaddr[60-63]
+|siselect#15|sireg[1-2] -> spmpswitch[0-1]
 |===
 
 *Direct CSR access*: SPMP CSRs can be accessed directly with corresponding CSR numbers if the `Sscsrind` extension is not implemented.
 
 [NOTE]
 ====
+The specific value of `siselect#1-15` will be allocated after review by the Arch Review Committee.
+
 Please refers to the specification of the `Sscsrind` extension for details of indirect CSR access.
 https://github.com/riscv/riscv-indirect-csr-access
 ====