From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sat, 29 Apr 2023 10:42:56 +0000 (+0100)
Subject: add ls001.po9 RFC
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=ecd44a60eb7cdd500bc1f451e03e2620db594fd5;p=libreriscv.git

add ls001.po9 RFC
---

diff --git a/openpower/sv/rfc/ls001.po9.mdwn b/openpower/sv/rfc/ls001.po9.mdwn
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+# External RFC ls001.po9 Allocation of new 64-bit Power ISA Encodings
+
+**URLs**:
+
+* <https://git.openpower.foundation/isa/PowerISA/issues/64>
+
+**Severity**: Major
+
+**Status**: New
+
+**Date**: 29 Apr 2023. v1
+
+**Target**: v3.2B
+
+**Source**: v3.0B
+
+**Books and Section affected**:
+
+```
+    New Section: 1.6.5
+    New Definitions: 1.3.1
+```
+
+**Summary**
+
+```
+    Introduces a new 64-bit encoding similar to EXT1xx in PO1, in which
+    32 new Primary Opcodes are introduced (EXT2xx), several RESERVED spaces
+    (57-bit and at least three 32-bit), and the RISC-paradigm Prefixing
+    concepts are introduced: SVP64 and SVP64Single.
+```
+
+**Submitter**: Luke Leighton (Libre-SOC)
+
+**Requester**: Libre-SOC
+
+**Impact on processor**:
+
+```
+    Addition of new "Zero-Overhead-Loop-Control" DSP-style Vector-style
+    Encoding concept, introduction of new 64-bit Encodings specifically
+    designed to be easily identifiable extremely early in Multi-Issue
+    systems
+```
+
+**Impact on software**:
+
+```
+    Requires support for new instructions in assembler, debuggers, and related tools.
+```
+
+**Keywords**:
+
+```
+    64-bit Encoding
+```
+
+**Motivation**
+
+Power ISA Encoding is a finite precious resource that is under pressure.
+New Primary Opcode areas are needed (beyond those already strictly defined
+as EXT1xx).  New Primary Opcode areas EXT232-263 allows for immediate growth,
+allowing Power ISA to catch up 12-15 years on Intel and ARM.  Also the
+Simple-V RISC-paradigm "Loop" subsystem based on x86 REP and Zilog Z80
+CPIR and LDIR may be cleanly and smoothly introduced.
+
+**Changes**
+
+Add the following entries to:
+
+* Section 1.3.1 Book I
+* Section 1.6.5 Book I
+
+[[!tag opf_rfc]]
+
+--------
+
+\newpage{}
+
+[[!inline pages="openpower/sv/po9_encoding" raw=yes ]]