rajamesandJunie
a8b70e88d3
Source tree reorganization: - Move StarForth v3 engine to v3/ (src/, include/, Makefile) - Move kernel to kernel/ (src/, include/, linker/, Makefile) - Create v4/ skeleton for F18-ISA golden model (DECOMPOSITION.md, JUSTIFICATION.md) - Move FABRIC-0..4.md to docs/fabric/ - Move ONTOLOGY.md and ROADMAP.md to docs/ Board infrastructure: - Add boards/ser5/, boards/raspi/, boards/milkv/, boards/zynq7020/ - Each board has board.mk (ISA, CPU flags, boot recipe) and README.md - Root Makefile becomes thin dispatcher: boot_image, all, clean, docs take TARGET - make boot_image TARGET=SER5|RASPI|MILKV builds one GPT/MBR image per board - ZYNQ7020 target exists but stops with clear error (ARMv7 port not built yet) - scripts/mkdiskimage.sh builds disk images for all boards Docs pipeline: - docs/book/ with LaTeX master (main.tex) and Makefile - pandoc converts Markdown to LaTeX at build time - Two Lua filters: table-widths.lua (wide tables wrap), code-breaks.lua (inline code breaks) - make docs builds single PDF (754 pages, 0 missing characters) - make docs TARGET=<board> adds board appendix - build/docs/<book|board>/meta.tex stamps git commit into PDF Bug fixes: - 42 include paths that only worked by accident now use correct relative paths - clang-18 hardcode replaced with configurable CC variable (fixed aarch64 build) - Pi 5: kernel_2712.img linked at 0x80000, .bss zeroed, memory reserved - Doxyfile, .clang-tidy, README.md, Kconfig paths updated Verified: - Hosted v3 build passes 1012 tests, 0 failures - SER5 image boots in QEMU (OVMF), POST passes, K exact (65536 = Q48_ONE) - Milk-V image boots in QEMU (OpenSBI + U-Boot + bootefi), POST passes - make clean TARGET=<board> removes only that board and its ISA objects - make all builds all boards, hosted v3, and docs in one run Co-authored-by: Junie <junie@jetbrains.com>
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/*
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StarForth — Steady-State Virtual Machine Runtime
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Copyright (c) 2023–2025 Robert A. James
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All rights reserved.
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This file is part of the StarForth project.
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Licensed under the StarForth License, Version 1.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at:
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https://github.com/star.4th@proton.me/StarForth/LICENSE.txt
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This software is provided "AS IS", WITHOUT WARRANTY OF ANY KIND,
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express or implied, including but not limited to the warranties of
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merchantability, fitness for a particular purpose, and noninfringement.
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See the License for the specific language governing permissions and
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limitations under the License.
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StarForth — Steady-State Virtual Machine Runtime
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Copyright (c) 2023–2025 Robert A. James
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All rights reserved.
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This file is part of the StarForth project.
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Licensed under the StarForth License, Version 1.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at:
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https://github.com/star.4th@proton.me/StarForth/LICENSE.txt
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This software is provided "AS IS", WITHOUT WARRANTY OF ANY KIND,
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express or implied, including but not limited to the warranties of
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merchantability, fitness for a particular purpose, and noninfringement.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*
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* math_portable.h
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*
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* Portable C99 math functions in Q48.16 64-bit fixed-point format.
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* Suitable for embedded environments with no libm
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* (HISTORICAL: also L4Re, through mid-2026; removed as an active target).
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* All arithmetic is integer-only for maximum performance.
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*
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* Q48.16 Format:
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* - 48-bit signed integer + 16-bit fractional part
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* - Precision: 2^-16 ≈ 0.0000153 (nanoseconds)
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* - Range: ±140 trillion ns (≈ 4.4 years)
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*
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* Functions:
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* sqrt_q48(x) - Square root of Q48.16 value via Newton-Raphson
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* erf_q48(x) - Error function of Q48.16 value (dimensionless)
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*/
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#ifndef MATH_PORTABLE_H
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#define MATH_PORTABLE_H
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#include <stdint.h>
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#define Q48_SCALE (1LL << 16) /* 65536 */
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/**
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* Square root in Q48.16 fixed-point
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* Input: x in Q48.16 format
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* Output: sqrt(x) in Q48.16 format
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* Uses Newton-Raphson: x_{n+1} = (x_n + a/x_n) / 2
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* Converges in ~10-15 iterations
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* Returns 0 for negative inputs (guard against domain error)
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*/
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int64_t sqrt_q48(int64_t x);
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/**
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* Error function in Q48.16 fixed-point
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* Input: x in Q48.16 format (dimensionless Z-score)
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* Output: erf(x) in Q48.16 format (range: -Q48_SCALE to +Q48_SCALE)
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* Uses Abramowitz & Stegun approximation (7.1.26)
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* Maximum error: 1.5e-7 relative to floating-point erf
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* Properties:
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* - erf(0) = 0
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* - erf(-x) = -erf(x) (odd function)
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* - erf(x) approaches ±Q48_SCALE for large |x|
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*/
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int64_t erf_q48(int64_t x);
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#endif /* MATH_PORTABLE_H */
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