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- examples/tinyos.c: host with 64K system RAM, 3x32KB task regions above 64K (bus_device_add_phys), MMU translate (virtual 32KB per task), console at , cooperative yield ( + JMP cd /home/rkujawa/repos/rk65c02 && git commit --trailer "Made-with: Cursor" -m "Add Tiny OS example: scheduler with extended physical RAM - examples/tinyos.c: host with 64K system RAM, 3x32KB task regions above 64K (bus_device_add_phys), MMU translate (virtual 32KB per task), console at $DE00, cooperative yield ($FF00 + JMP $1000) and WAI + idle_wait + IRQ yield, vectors at $FFFC-$FFFF - examples/tinyos_kernel.s: entry at $8000, IRQ handler at $8010 (JMP $1000) - examples/tinyos_task.s: per-task loop printing task id, round-robin yield, optional WAI, STP after 3 runs - Makefile: tinyos target, run-tinyos with timeout - README.md, doc/MMU.md: document Tiny OS (64K virtual + expanded physical) - .gitignore: /examples/tinyos"000) and WAI + idle_wait + IRQ yield, vectors at - - examples/tinyos_kernel.s: entry at 000, IRQ handler at 010 (JMP cd /home/rkujawa/repos/rk65c02 && git commit --trailer "Made-with: Cursor" -m "Add Tiny OS example: scheduler with extended physical RAM - examples/tinyos.c: host with 64K system RAM, 3x32KB task regions above 64K (bus_device_add_phys), MMU translate (virtual 32KB per task), console at $DE00, cooperative yield ($FF00 + JMP $1000) and WAI + idle_wait + IRQ yield, vectors at $FFFC-$FFFF - examples/tinyos_kernel.s: entry at $8000, IRQ handler at $8010 (JMP $1000) - examples/tinyos_task.s: per-task loop printing task id, round-robin yield, optional WAI, STP after 3 runs - Makefile: tinyos target, run-tinyos with timeout - README.md, doc/MMU.md: document Tiny OS (64K virtual + expanded physical) - .gitignore: /examples/tinyos"000) - examples/tinyos_task.s: per-task loop printing task id, round-robin yield, optional WAI, STP after 3 runs - Makefile: tinyos target, run-tinyos with timeout - README.md, doc/MMU.md: document Tiny OS (64K virtual + expanded physical) - .gitignore: /examples/tinyos Made-with: Cursor
44 lines
1.1 KiB
ArmAsm
44 lines
1.1 KiB
ArmAsm
; =============================================================================
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; Tiny OS — Per-task code (loaded at physical $11000, $18100, $20100)
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; =============================================================================
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; Assemble to tinyos_task.rom. Host loads at 0x10000+$1000 for each task.
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; Virtual $1000 is mapped to the current task's physical 32KB region.
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;
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; Guest contract: $FF00 = yield (write next task id 0/1/2), $FF01 = current
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; task id (read-only). Console at $DE00. Each task prints its id, yields
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; round-robin; every other yield does WAI so host can switch via IRQ.
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; =============================================================================
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.org 0x1000
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task_entry:
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lda 0xFF01 ; current task id
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clc
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adc #48 ; ASCII '0'
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sta 0xDE00 ; print to console
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inc 0x02 ; yield parity (per-task ZP)
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lda 0x02
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and #1
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bne coop_yield
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wai ; every other yield: host switches, asserts IRQ
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coop_yield:
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inc 0x0200 ; run count (per-task)
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lda 0x0200
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cmp #3
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bcs halt
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lda 0xFF01 ; next task = (current + 1) % 3
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clc
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adc #1
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cmp #3
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bcc ok
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lda #0
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ok:
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sta 0xFF00 ; yield to next task
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jmp task_entry
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halt:
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stp
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