From: lkcl <lkcl@web>
Date: Sun, 25 Aug 2024 23:31:46 +0000 (+0100)
Subject: (no commit message)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=04b72e35379c2847b5f0ad190000515774fa7adb;p=libreriscv.git

---

diff --git a/crypto_router_asic.mdwn b/crypto_router_asic.mdwn
index ce1381ac1..c98e3e0da 100644
--- a/crypto_router_asic.mdwn
+++ b/crypto_router_asic.mdwn
@@ -22,7 +22,11 @@ or ASIC for oneself.
 
 # Deliverables
 
-See top-level bugreport [#589](https://bugs.libre-soc.org/show_bug.cgi?id=589#c0)
+See top-level bugreport [#589](https://bugs.libre-soc.org/show_bug.cgi?id=589#c0) - all Milestones were achieved 100% successfully
+as defined, including one additional Milestone added after the initial
+approval in 2021, for
+[power-modulo](https://bugs.libre-soc.org/show_bug.cgi?id=1044)
+arithmetic (the basis of RSA, DH etc).
 
 **1) A set of general-purpose scalar instructions suitable for cryptographic applications as well as many other purposes**
 
@@ -35,7 +39,8 @@ on big integer arithmetic on top of SVP64 vectorization.
 
 **2) Implementation and validation of the above instructions on the ISA simulator**
 
-The implementation is scattered within the simulator code, which is available at:
+As with all large software projects the implementation is scattered within
+the simulator code, which is available at:
 <https://git.libre-soc.org/?p=openpower-isa.git;a=tree;hb=HEAD>
 
 Unit tests are available at:
@@ -72,15 +77,18 @@ and directly run the test scripts referenced above.
 and element width overrides**
 
 These, when implemented also in HDL, will allow hyper-efficient acceleration of
-many fundamental crypto algorithms.
+many fundamental crypto algorithms in hardware.
 
 * [REMAP documentation](https://libre-soc.org/openpower/sv/remap/)
 * [Element width overrides documentation](https://libre-soc.org/openpower/sv/overview/#elwidths)
 
-Implemented 100% in ISA simulator, allowing 100% successful implementation of Simple-V-PowerISA assembler to be made.
+These are implemented 100% in the ISA simulator, allowing 100% successful implementation and simulation of Simple-V-PowerISA assembler to be made.
+Once the HDL for these key criticl parts of SV are available (when
+funded) then as usual the exact same assembler run under the
+simulator may be run on FPGA or ASIC.
 
 (But limited budget of 2021-02-051 was insufficient to complete HDL
-implementation.)
+implementation)
 
 **5) Documentation and demonstration of the general-purpose instructions that
 happen to also help accelerate cryptographic algorithms**
@@ -98,12 +106,15 @@ One catastrophic mistake made by many cryptographic instruction implementations
 is to create over-specific instructions. "multiply by 2 then subtract 5" for example (the basis of a RISC-V chacha20 "accelerator"!)
 
 Using our instructions, [our implementation of chacha20](https://git.libre-soc.org/?p=openpower-isa.git;a=blob;f=crypto/chacha20/src/xchacha_encrypt_bytes_svp64.s;h=c1e0a8675cf679036b27de0bf83f8320ee36339a;hb=HEAD)
-only has TEN INSTRUCTIONS in the inner loop entire algorithm. See:
+only has TEN INSTRUCTIONS in the inner loop entire algorithm - a 50 to 100-fold
+reduction in code density. See:
 [chacha20 design document](/openpower/sv/cookbook/chacha20).
 
 To run the chacha20 test in the ISA simulator, go to the
 `~/src/openpower-isa/crypto/chacha20` directory, run `make` and
 `SILENCELOG=1 ./test-chacha20` (warning: long running).
+This unit test may also be run directly
+<https://git.libre-soc.org/?p=openpower-isa.git;a=blob;f=src/openpower/decoder/isa/test_caller_svp64_chacha20.py;hb=HEAD>
 
 Further reading: