add cache-testing program and software font rendering
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245
cachetest.asm
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245
cachetest.asm
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arch n64.cpu
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endian msb
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include "inc/util.inc"
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include "inc/n64.inc"
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include "inc/64drive.inc"
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output "cache.z64", create
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fill 1052672 // ROM size
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origin 0
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base 0x80000000
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// N64 header:
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dw $80371240 // PI_BSB_DOM1
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dw $F // Initial Clock Rate
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dw Start // Boot Address Offset
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dw $1444 // Release Offset
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db "CRC1" // CRC1: COMPLEMENT CHECK
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db "CRC2" // CRC2: CHECKSUM
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dd 0 // unused
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db "Cache tests "
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// "123456789012345678901234567"
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db $00 // Developer ID Code
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db $00 // Cartridge ID Code
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db 0 // unused
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db $00 // Country Code
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db 0 // unused
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insert "bin/6102.bin"
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if origin() != 0x1000 {
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error "bad header or bootcode; combined size should be exactly 0x1000"
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}
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constant K_DEBUG(0)
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constant K_BASE(0x8000)
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constant K_CONSOLE_AVAILABLE(0x0000)
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constant K_CI_BASE(0x0004)
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constant K_DUMP(0x0020)
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constant MAIN_BASE(0x8001)
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constant MAIN_FROM(0x0000)
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constant MAIN_TO(0x0080)
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constant MAIN_FONT(0x4000)
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constant WIDTH(640)
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constant HEIGHT(480)
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constant DEPTH(2)
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constant VIDEO_BUFFER(0x80400000 - WIDTH * HEIGHT * DEPTH)
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constant VIDEO_MODE(BPP16 | INTERLACE | AA_MODE_2 | DIVOT_EN | PIXEL_ADV_3 | DITHER_FILTER_EN)
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constant INIT_STACK(VIDEO_BUFFER - 0x10) // remember, it grows backwards.
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macro AsciiNybble(out, reg) {
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sltiu at, {reg}, 0xA
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bnez at,+
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addiu {out}, {reg}, 0x30 // delay slot
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addiu {out}, {reg}, 0x41 - 0xA
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+
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}
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Start:
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// initialize the N64 so it doesn't immediately die.
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lui a0, PIF_BASE
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lli t0, 8
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sw t0, PIF_RAM+0x3C(a0)
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// no console for this test, just drawing on the screen.
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lui a0, K_BASE
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sw r0, K_CONSOLE_AVAILABLE(a0)
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// set up the stack so we can actually call some functions later.
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la sp, INIT_STACK
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sw r0, 0x0(sp)
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sw r0, 0x4(sp)
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sw r0, 0x8(sp)
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sw r0, 0xC(sp)
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// clear the screen.
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la a0, VIDEO_BUFFER
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la a1, VIDEO_BUFFER + WIDTH * HEIGHT * DEPTH
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-
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addiu a0, 4
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sw r0, -4(a0)
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bne a0, a1,-
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// write some dummy data to play with.
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li t1, 0xDEADBEEF
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li t2, 0xCAFEBABE
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li t3, 0xABAD1DEA
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li t4, 0x12345678
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lui a0, MAIN_BASE
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// spaced out a bit just to see what happens.
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sw t1, 0x00(a0)
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sw r0, 0x04(a0)
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sw t2, 0x08(a0)
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sw r0, 0x0C(a0)
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sw t3, 0x10(a0)
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sw r0, 0x14(a0)
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sw t4, 0x18(a0)
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sw r0, 0x1C(a0)
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// let's try a DMA despite not having invalidated the writeback cache.
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SP_DMA_WAIT() // clobbers t0,a0
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la t5, (SP_MEM_BASE << 16) | SP_DMEM
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la t6, ((MAIN_BASE << 16) | MAIN_FROM) & ADDR_MASK
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li t7, 0x20 - 1 // DMA transfers always take one less.
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lui a0, SP_BASE
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sw t5, SP_MEM_ADDR(a0)
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sw t6, SP_DRAM_ADDR(a0)
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sw t7, SP_RD_LEN(a0) // pull data from RDRAM into DMEM/IMEM
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SP_DMA_WAIT() // clobbers t0,a0
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// and back out again, in a different spot.
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la t6, ((MAIN_BASE << 16) | MAIN_TO) & ADDR_MASK
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sw t5, SP_MEM_ADDR(a0)
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sw t6, SP_DRAM_ADDR(a0)
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sw t7, SP_WR_LEN(a0) // pull data from DMEM/IMEM into RDRAM
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SP_DMA_WAIT() // clobbers t0,a0
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if 0 {
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// load results into registers.
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lui a0, MAIN_BASE
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lw t1, 0x80(a0)
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lw t2, 0x88(a0)
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lw t3, 0x90(a0)
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lw t4, 0x98(a0)
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}
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lui a0, MAIN_BASE
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jal LoadFont16
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ori a0, MAIN_FONT
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// show our results on-screen.
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lli s0, 64 // s0: X
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lli s1, 48 // s1: Y
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lli s2, 0x20 / 4 // s2: number of words to draw
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lui s3, MAIN_BASE
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ori s3, MAIN_TO // s3: start of data to dump
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// ori s3, MAIN_FROM
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MainHexDumpLoop:
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lw s4, 0(s3) // s4: current word being drawn
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addiu s0, 8 * 8
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lli s5, 8 // s5: inner loop iteration count
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MainHexDumpInnerLoop:
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andi t0, s4, 0x0F
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subiu s0, 8
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lui a0, MAIN_BASE
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ori a0, MAIN_FONT
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AsciiNybble(a1, t0)
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sll a2, s1, 16
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or a2, s0
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la a3, VIDEO_BUFFER
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jal DrawChar16
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nop
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subiu s5, 1
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bnez s5, MainHexDumpInnerLoop
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srl s4, 4
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subiu s2, 1
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addiu s1, 12
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bnez s2, MainHexDumpLoop
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addiu s3, 4
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// use our old cache-poking utility for now.
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jal PokeDataCache
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nop
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if 0 {
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ScreenNTSC2(WIDTH, HEIGHT, VIDEO_MODE, VIDEO_BUFFER | UNCACHED)
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} else {
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lui a0, VI_BASE
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li t1, VIDEO_MODE
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li t2, VIDEO_BUFFER | UNCACHED
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li t3, 0x00000280
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li t4, 0 // 0x00000200
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li t5, 0x00000000
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li t6, 0x03E52239
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li t7, 0x0000020C
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sw t1, 4 * 0(a0)
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sw t2, 4 * 1(a0)
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sw t3, 4 * 2(a0)
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sw t4, 4 * 3(a0)
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sw t5, 4 * 4(a0)
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sw t6, 4 * 5(a0)
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sw t7, 4 * 6(a0)
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li t1, 0x00000C15
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li t2, 0x0C150C15
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li t3, 0x006C02EC
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li t4, 0x002301FD
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li t5, 0x000E0204
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li t6, 0x00000400
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li t7, 0x02000800
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sw t1, 4 * 7(a0)
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sw t2, 4 * 8(a0)
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sw t3, 4 * 9(a0)
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sw t4, 4 * 10(a0)
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sw t5, 4 * 11(a0)
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sw t6, 4 * 12(a0)
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sw t7, 4 * 13(a0)
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}
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VideoLoop:
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WaitScanline(2)
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j VideoLoop
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nop
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Die:
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j Die
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nop
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PokeDataCache:
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lui a0, 0x8000
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ori a1, a0, 8 * 1024 // cache size
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-
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cache 1, 0x00(a0)
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cache 1, 0x10(a0)
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cache 1, 0x20(a0)
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cache 1, 0x30(a0)
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cache 1, 0x40(a0)
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cache 1, 0x50(a0)
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cache 1, 0x60(a0)
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cache 1, 0x70(a0)
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addiu a0, 0x80
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bne a0, a1,-
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nop
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jr ra
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nop
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include "font.asm"
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109
font.asm
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109
font.asm
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@ -0,0 +1,109 @@
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constant FONT_SIZE16(8 * 12 * 2 * 256) // 0xC000
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LoadFont16:
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// loads a 256-character, 8x12 font
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// as an RGB5A1 (16-bpp) image to the specified address.
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// a0: address to load font to (size: 0xC000)
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li t9, FONT_SIZE16
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addu a1, a0, t9 // a1: end of output (exclusive)
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la a2, FONT // a2: start of input
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la a3, FONT + FONT.size // a3: end of input (exclusive)
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LoadFont16Loop:
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lbu t9, 0(a2)
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addiu a2, 1
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// sign-extend every pixel to get our blacks and whites.
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sll t1, t9, 24
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sll t2, t9, 25
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sll t3, t9, 26
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sll t4, t9, 27
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sll t5, t9, 28
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sll t6, t9, 29
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sll t7, t9, 30
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sll t8, t9, 31
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//
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sra t1, 31
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sra t2, 31
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sra t3, 31
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sra t4, 31
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sra t5, 31
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sra t6, 31
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sra t7, 31
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sra t8, 31
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sh t1, 0x0(a0)
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sh t2, 0x2(a0)
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sh t3, 0x4(a0)
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sh t4, 0x6(a0)
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sh t5, 0x8(a0)
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sh t6, 0xA(a0)
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sh t7, 0xC(a0)
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sh t8, 0xE(a0)
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bne a2, a3, LoadFont16Loop
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addiu a0, 0x10
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jr ra
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nop
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DrawChar16:
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// draws a 16-bpp character on-screen at the specified coordinates.
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// a0: font data address (same argument as LoadFont16)
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// a1: character (range: 0 to 255 inclusive)
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// a2: X, Y coordinate in pixels: X | Y << 16
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// a3: output image address
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lli t9, 8 * 12 * 2
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multu a1, t9
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mflo t9
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addu a0, t9 // a0: character data address
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andi a1, a2, 0xFFFF // a1: X
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srl a2, 16 // a2: Y
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sll t0, a1, 1
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lli t9, WIDTH * 2
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multu a2, t9
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mflo t9
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addu a3, t0 // offset output by X
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addu a3, t9 // offset output by Y
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lli t9, 12 // t9: rows remaining (character height)
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DrawChar16Loop:
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// character width hardcoded for 8.
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lhu t1, 0x0(a0)
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lhu t2, 0x2(a0)
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lhu t3, 0x4(a0)
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lhu t4, 0x6(a0)
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lhu t5, 0x8(a0)
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lhu t6, 0xA(a0)
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lhu t7, 0xC(a0)
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lhu t8, 0xE(a0)
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sh t1, 0x0(a3)
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sh t2, 0x2(a3)
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sh t3, 0x4(a3)
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sh t4, 0x6(a3)
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sh t5, 0x8(a3)
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sh t6, 0xA(a3)
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sh t7, 0xC(a3)
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sh t8, 0xE(a3)
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addiu a0, 0x10
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subiu t9, 1
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bnez t9, DrawChar16Loop
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addiu a3, WIDTH * 2
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jr ra
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nop
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FontLUT16:
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dh 0x0000, 0xFFFF
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FontLUT32:
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dw 0x00000000, 0xFFFFFFFF
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align(16); insert FONT, "res/dwarf.1bpp"
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