snark13
737c974400
- Split tests/ (libc feature tests) and examples/ (real apps); shared
app.mk in repo root, was examples/example.mk
- libc/io/* split into libc/{conio,env,errno,file,mouse,string,sys,
time,video}/ — clearer module boundaries
- New examples/mdview/: markdown viewer (Phases 1-5 + light nested
lists). Headers (H1-H4), HR, ulist/olist/quote with nesting via
leading spaces, fenced code blocks, inline emphasis (bold/italic/
underscore/code), wrap/unwrap mode with soft wrap (F2), horizontal
pan (← →) with '>' truncation indicator
- libc additions: scroll() in conio (ESTEX SCROLL), strlwr/strupr,
gets() test
- Makefile updates across tests/ for the new shared app.mk path
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
88 lines
2.9 KiB
C
88 lines
2.9 KiB
C
/*
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* bank_local_data — demonstrates that a banked function can own its own
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* static (BSS) array and a const lookup table without burning HOME
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* memory. When the function executes, BANK1 is mapped into window 3
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* and both code and data are directly addressable.
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*
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* No bank_read / bank_write needed — the trampoline maps the bank for
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* us and the C code touches the arrays normally.
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*/
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#include <stdio.h>
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#include <stdint.h>
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extern void bank1_fill (int seed) __banked;
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extern uint16_t bank1_sumtab (void) __banked;
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extern uint8_t bank1_peek (int idx) __banked;
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extern void bank1_map_print(void) __banked;
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extern uint8_t *bank1_alloc_and_fill(int n, uint8_t pattern) __banked;
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extern void bank1_free (void *p) __banked;
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/* MUST be `const`: crt0_banked reads _n_banks BEFORE gsinit, so
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* non-const initialized variables haven't been copied yet and would
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* read 0 → bank loading is skipped → garbage in window 3. */
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const uint8_t n_banks = 1;
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uint8_t local0_buf[16];
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int main(int argc, char **argv)
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{
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puts("bank_local_data: testing static data in BANK1");
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bank1_map_print();
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/* Verify crt0_banked parsed argv correctly. */
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printf("argc=%d, argv[0]=\"%s\"\n", argc, argv[0]);
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printf("local0_buf = %p\n", local0_buf);
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for (int i = 1; i < argc; i++)
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printf(" argv[%d]=\"%s\"\n", i, argv[i]);
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/* Seed the BSS array in BANK1. */
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bank1_fill(0x10);
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/* Read it back through another banked function — verifies the data
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* survived after the trampoline returned to HOME and re-entered. */
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int ok = 1;
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for (int i = 0; i < 8; i++) {
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uint8_t v = bank1_peek(i);
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uint8_t expected = (uint8_t)(0x10 + i);
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if (v != expected) {
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printf(" bank1_buf[%d] = 0x%02X, expected 0x%02X\n",
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i, v, expected);
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ok = 0;
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}
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}
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if (ok)
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puts(" buf[0..7] OK");
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/* Use the const lookup table that lives in BANK1. */
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uint16_t sum = bank1_sumtab();
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printf(" bank1_sumtab() = %u (expected 1500)\n", sum);
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/* malloc from a banked function — the heap lives in W2 (HOME),
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* which stays mapped across W3 page swaps. Returned pointer
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* should be usable both inside the bank AND from HOME afterwards. */
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uint8_t *heap_p = bank1_alloc_and_fill(32, 0xA0);
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if (heap_p == NULL) {
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puts(" malloc from bank FAILED");
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} else {
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printf(" caller sees pointer = %p\n", heap_p);
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int ok = 1;
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for (int i = 0; i < 32; i++) {
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uint8_t expected = (uint8_t)(0xA0 + i);
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if (heap_p[i] != expected) {
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printf(" heap_p[%d] = 0x%02X, expected 0x%02X\n",
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i, heap_p[i], expected);
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ok = 0;
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}
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}
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if (ok) puts(" bank-allocated heap [0..31] OK from HOME");
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bank1_free(heap_p);
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}
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puts("done");
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return 0;
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}
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