Add RISC-V Platform Support to Harness

[williamofai]

Issue: Add RISC-V Platform Support to Harness

Summary

Extend certifiable-harness to detect and report RISC-V platforms, enabling golden reference comparison on TT hardware.

Background

certifiable-harness currently detects:

• x86_64 — Intel/AMD 64-bit
• aarch64 — ARM 64-bit
• unknown — Fallback

For Tenstorrent integration, we need:

• riscv64 — RISC-V 64-bit detection
• Potentially ttsim — Simulator-specific identifier

Tasks

• Add RISC-V detection to ch_get_platform() in harness.c
• Update CH-MATH-001 platform enumeration
• Add riscv64 to README verified platforms table
• Test platform string appears correctly in golden reference
• Test platform string appears correctly in JSON report

Implementation

const char *ch_get_platform(void)
{
#if defined(__x86_64__) || defined(_M_X64)
    return "x86_64";
#elif defined(__aarch64__) || defined(_M_ARM64)
    return "aarch64";
#elif defined(__riscv) && (__riscv_xlen == 64)
    return "riscv64";
#else
    return "unknown";
#endif
}

Acceptance Criteria

• ./certifiable-harness reports Platform: riscv64 when built for RISC-V
• Golden reference records correct platform
• JSON report shows correct platform
• Cross-compilation builds successfully

Assignee

@brixen

Labels

enhancement risc-v harness