76 lines
1.7 KiB
PHP
76 lines
1.7 KiB
PHP
// settings:
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constant K_DEBUG(1) // slows down interrupt handling to enable debug routines
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// address stuff:
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constant UNCACHED(0xA0000000)
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constant ADDR_MASK(0x1FFFFFFF)
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// "kernel" constants:
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constant K_BASE(0x8000) // k0 is set to this.
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constant K_DUMP(0x0400) // we save registers and state here
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// when handling interrupts
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constant K_REASON(0x0600)
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constant K_CAUSE(0x0604)
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constant K_STATUS(0x0608)
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constant K_IN_MAIN(0x060C)
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constant K_EPC(0x0610)
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constant K_ERRORPC(0x0614)
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constant K_BADVADDR(0x0618)
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constant K_64DRIVE_MAGIC(0x0700)
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constant K_CI_BASE(0x0704)
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constant K_STACK(0x0C00 - 0x10)
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constant K_XXD(0x0C00) // size: 0x400 (any larger and you overwrite kernel code)
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// note this gets subtracted by 0x10 and the stack grows *backwards.*
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constant K_STACK_INIT_BASE(0x803F)
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// internal interrupt enum: (0 means no known interrupt/exception)
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constant K_INT_TLB_REFILL(1)
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constant K_INT_XTLB_REFILL(2)
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constant K_INT_CACHE_ERROR(3)
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constant K_INT_OTHER(4)
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constant BLAH_BASE(0x803F)
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constant BLAH_COUNTS(0x0010)
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constant BLAH_SP_TASK(0x0040)
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constant BLAH_DLIST_JUMPER(0x0080)
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constant BLAH_XXD(0x0100)
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constant VIDEO_BUFFER(0x80100000)
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constant VIDEO_BUFFER_SIZE(640 * 480 * 4)
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constant VIDEO_STACK(VIDEO_BUFFER + VIDEO_BUFFER_SIZE)
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constant VIDEO_STACK_SIZE(0x400)
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constant VIDEO_YIELD(VIDEO_STACK + VIDEO_STACK_SIZE)
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constant VIDEO_YIELD_SIZE(0xC00)
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macro nops(new_pc) {
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while (pc() < {new_pc}) {
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nop
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}
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}
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macro PI_WAIT() {
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lui t5, PI_BASE
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-
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lw t0, PI_STATUS(t5)
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andi t0, t0, 3
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bnez t0,-
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nop // delay slot
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}
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macro SP_DMA_WAIT() { // external
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lui t5, SP_BASE
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-
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lw t0, SP_DMA_FULL(t5)
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bnez t0,-
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nop
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-
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lw t0, SP_DMA_BUSY(t5)
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bnez t0,-
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nop
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}
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