Claude
16b9747d33
347 headers said "Licensed under the StarForth License, Version 1.0" -- a shortening (Captain Bob, 2026-11-08: "License file SL I think I shortened accidently"); LICENSE is, and has been since the first commit, the Starship License 1.0 (SL-1.0, SPDX LicenseRef-Starship-1.0). 349 files, 566 occurrences, now "Starship License, Version 1.0 (SL-1.0)". Left as they are, pending a ruling: docs/patent/ (the patent figures), docs/formal/ (the citable volumes) and the generated reports under docs/working/experiments/ (32 files). Comments and license text only: the amd64 kernel builds, every changed script parses. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GE3SDvQn5EoxdGufk84zz2
52 lines
1.9 KiB
C
52 lines
1.9 KiB
C
/*
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StarForth — Steady-State Virtual Machine Runtime
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Copyright (c) 2023–2025 Robert A. James. All rights reserved.
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Licensed under the Starship License, Version 1.0 (SL-1.0).
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*/
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/**
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* fdt_uart.h - the console's serial line, as a board's devicetree names it.
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*
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* A board has one serial line that is its console, and its devicetree says
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* which: /chosen/stdout-path, either the path of a node or an alias for one
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* (/aliases), with line settings after a colon that are not used here. The
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* firmware that handed the devicetree over has already set that line up.
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* This finds what kind of UART it is, where it is as the CPU addresses it,
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* and how its registers are laid out.
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*
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* Nothing is guessed. If the devicetree does not name a console, or names
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* one this cannot place or has no driver for, there is no line.
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*
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* Verified off the boards by tools/fdt_uart_test.c.
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*/
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#ifndef STARKERNEL_FDT_UART_H
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#define STARKERNEL_FDT_UART_H
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#include <stdint.h>
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enum
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{
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FDT_UART_NONE = 0, /**< no line */
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FDT_UART_PL011, /**< ARM PL011: 32-bit registers, four bytes apart */
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FDT_UART_16550 /**< 16550 and its kin (ns16550a, snps,dw-apb-uart), by memory */
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};
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typedef struct
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{
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int kind; /**< FDT_UART_* */
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uint64_t base; /**< address of register 0, as the CPU sees it */
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uint32_t reg_shift; /**< register n is at base + (n << reg_shift) */
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uint32_t io_width; /**< bytes read or written at a time: 1 or 4 */
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} fdt_uart_t;
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/**
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* @brief Find the console's serial line in a devicetree.
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* @param fdt Blob; NULL and what is not a devicetree are safe.
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* @param out Receives the line; its kind is FDT_UART_NONE when 0 is returned.
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* @return 1 if the devicetree names a console UART that was found, placed
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* and is of a kind listed above; 0 otherwise.
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*/
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int fdt_console_uart(const void* fdt, fdt_uart_t* out);
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#endif /* STARKERNEL_FDT_UART_H */
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