100 lines
1.7 KiB
NASM
100 lines
1.7 KiB
NASM
; Constants
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const SYS_STACK_START: 0x03fffff0
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const BG_FRAMEBUFFER: 0x2000000
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const SCREEN_WIDTH: 640
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const SCREEN_HEIGHT: 480
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; Globals
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const FRAMENR: 0x00000000
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const SHOWING_LOGO: 0x00000004
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org 0xf0000000
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entry:
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mcl ; disable MMU
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mov rsp, SYS_STACK_START ; set stack pointer
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mov r0, entry_str
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call serial_print
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mov r0, version_str_1
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call serial_print
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mov r0, version_str
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call serial_print
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mov r0, version_str_2
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call serial_print
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mov r0, sha_str
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call serial_print
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mov r0, version_str_3
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call serial_print
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call show_logo
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mov r0, booting_str
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call serial_print
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halt
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entry_str: data.str "== Welcome to Xen32OS" data.8 0
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; defines version_str, sha_str
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#include "data/version.inc"
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version_str_1: data.str " - version " data.8 0
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version_str_2: data.str " (" data.8 0
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version_str_3: data.str ") ==" data.8 10 data.8 0
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booting_str: data.str "booting..." data.8 10 data.8 0
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; input:
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; str: &str0 @ r0
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; returns:
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; nothing
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; clobbers:
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; r0
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serial_print:
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cmp.8 [r0], 0
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ifz ret
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out 0x00000000, [r0]
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inc r0
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jmp serial_print
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; input:
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; n: u64 @ r0
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; returns
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; nothing
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; clobbers:
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; r0
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serial_print_num:
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cmp r0, 0
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ifz jmp serial_print_num_zero
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call serial_print_num_nonzero
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ret
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serial_print_num_nonzero:
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cmp r0, 0
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ifz ret
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push r0
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div r0, 10
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call serial_print_num_nonzero
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pop r0
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rem r0, 10
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add r0, 48
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out 0x00000000, r0
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ret
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serial_print_num_zero:
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mov r0, serial_print_num_str_zero
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jmp serial_print ; tail call
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serial_print_num_str_zero: data.str "0" data.8 0
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serial_print_nl:
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out 0x00000000, 10
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ret
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#include "logo.asm"
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