snark13
c71e249a4e
First substantive commit: the entire Sprinter C compiler tree on top of
the bare README+gitignore initial commit.
What's in here:
bin/sprinter-cc — driver script invoking SDCC + linker + mkexe
libc/ — Sprinter-specific libc layer over ESTEX/BIOS
(conio, gfx, io, mem, stdio + headers)
runtime/ — crt0 variants (default/small/banked/minimal)
+ heap + bank trampolines
toolchain/ — mkexe (SprintEXE packer, C + tests)
examples/ — 30 demo programs (gfx, file I/O, env, time, …)
lib/Makefile — builds the libc archive (sprinter.lib)
docs/ — converted Sprinter manuals + asm reference samples
third_party/ — solid-c reference compiler dump + sdcc setup script
release_docs/ — packaging / release notes
gitignore overhaul:
• Drop dangerous blanket patterns: *.asm (would hide docs/samples/*.asm)
and *.exe (case-insensitive match was hiding third_party/solid-c/*.EXE
on macOS APFS). Replaced with examples/*/*.{asm,exe,…} and lib/*.lib.
• Restore tracking of toolchain/mkexe/tests/{one,big}.bin — those are
INPUT fixtures, not build outputs.
• Collapse the duplicated SDCC/C/Sdcc sections into one section per
concern (build outputs / vendored / OS-junk).
• Add .sprinter-cc-*/, build/ (catches lib/build/ too), .claude/.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/*
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* bank_io — HOME-resident helpers to read/write a "far" page that lives
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* in some physical RAM page outside the currently-mapped W3 bank.
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*
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* - We always run from HOME (window 1, always mapped), so we are free
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* to swap W3 (port 0xE2) between the caller's bank and the data
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* page, then restore it before returning.
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* - The caller must not rely on W3 contents during the call — the swap
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* is transparent to instruction-fetch (we execute from W1), and only
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* this function touches W3.
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* - DI/EI is NOT applied around the swap; ISRs in HOME are unaffected,
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* and banked-call ISRs are not expected in our current design.
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*/
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#include <stdint.h>
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#include <string.h>
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#include <sprinter.h>
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#include <sprinter_mem.h>
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uint8_t bank_load_byte(uint8_t phys_page, uint16_t off_in_window)
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{
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uint8_t saved = _io_page_w3;
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sprinter_page_w3(phys_page);
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uint8_t v = *((volatile uint8_t *)(0xC000u + off_in_window));
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sprinter_page_w3(saved);
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return v;
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}
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void bank_store_byte(uint8_t phys_page, uint16_t off_in_window, uint8_t v)
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{
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uint8_t saved = _io_page_w3;
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sprinter_page_w3(phys_page);
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*((volatile uint8_t *)(0xC000u + off_in_window)) = v;
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sprinter_page_w3(saved);
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}
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void bank_read(uint8_t phys_page, uint16_t off, void *dst, uint16_t n)
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{
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uint8_t saved = _io_page_w3;
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sprinter_page_w3(phys_page);
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memcpy(dst, (const void *)(0xC000u + off), n);
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sprinter_page_w3(saved);
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}
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void bank_write(uint8_t phys_page, uint16_t off, const void *src, uint16_t n)
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{
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uint8_t saved = _io_page_w3;
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sprinter_page_w3(phys_page);
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memcpy((void *)(0xC000u + off), src, n);
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sprinter_page_w3(saved);
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}
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