karina
b33f63635b
build: moved CMake toolchain for Bootloader from Source folder to root of Bootloader
60 lines
1.0 KiB
ArmAsm
60 lines
1.0 KiB
ArmAsm
.section .text.boot, "ax"
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.global _start
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_start:
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add x1, x0, #64
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ldr x2, [x1] // base
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ldr x3, [x1, #16] // width
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ldr x4, [x1, #24] // height
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mul x5, x3, x4
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mov x7, #5
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udiv x10, x5, x7 // stripe size
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// 0x00RRGGBB
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// lblue: 5B CE FA
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mov w11, #0xCEFA
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movk w11, #0x5B, lsl #16
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// pink: F5 A7 B8
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mov w12, #0xA7B8
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movk w12, #0xF5, lsl #16
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// white: FF FF FF
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mov w13, #0xFFFF
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movk w13, #0xFF, lsl #16
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mov x14, #0 // pixels in curr stripe
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mov x15, #0 // stripe index
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fill_loop:
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cbz x5, done
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cmp x15, #0
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b.eq set_blue
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cmp x15, #1
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b.eq set_pink
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cmp x15, #2
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b.eq set_white
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cmp x15, #3
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b.eq set_pink
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b set_blue
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set_blue: mov w6, w11; b draw
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set_pink: mov w6, w12; b draw
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set_white: mov w6, w13
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draw:
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str w6, [x2], #4
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sub x5, x5, #1
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add x14, x14, #1
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cmp x14, x10
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b.lt fill_loop
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mov x14, #0
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add x15, x15, #1
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b fill_loop
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done:
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b done |