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https://github.com/rkujawa/rk65c02.git
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ee826da6ec
- Add MMU API: translate and fault callbacks, begin/mark/end_update, TLB - Translation result: ok, paddr (32-bit), perms (R/W/X), fault_code, no_fill_tlb - Internal TLB (transparent); no_fill_tlb for context-dependent mappings - JIT: invalidate only code on changed pages; code-page refcount - Fault: EMUERROR, mmu_last_fault_*; resume by re-run after mapping update - doc/MMU.md: design goals, API reference, usage, guest contract, limits - examples/mmu_cart: C64-style bank switch (host + guest asm) - examples/mmu_multitasking: minimal task switch (host + guest asm) - test_mmu: MMU tests; bench_mmu: ns/insn for MMU configs - README: MMU feature and example links Made-with: Cursor
27 lines
882 B
ArmAsm
27 lines
882 B
ArmAsm
; =============================================================================
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; MMU Multitasking — Per-task code (loaded at physical $1000 and $5000)
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; =============================================================================
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; Assemble to mmu_multitasking_task.rom. The host loads this at physical
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; $1000 (task 0) and $5000 (task 1). Virtual $1000 is mapped to either
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; physical $1000 or $5000 depending on current task.
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;
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; Guest contract: $FF00 = yield (write next task id), $FF01 = current task id (read-only, set by host).
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; =============================================================================
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.org 0x1000
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task_entry:
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inc 0x0200 ; per-task counter (each task has its own 0x0200)
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lda 0x0200
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cmp #3
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bcs halt
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lda 0xFF01 ; current task id (host wrote it when switching)
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eor #1
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sta 0xFF00 ; yield to the other task
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jmp task_entry
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halt:
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stp
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