mirror of
https://github.com/AsahiLinux/m1n1
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62 lines
894 B
ArmAsm
62 lines
894 B
ArmAsm
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/* SPDX-License-Identifier: MIT */
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#define UART_BASE 0x235200000
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#define UTRSTAT 0x010
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#define UTXH 0x020
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.extern _start_c
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.extern _stack_bot
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.section .init, "ax"
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.globl _start
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.type _start, @function
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_start:
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mov x9, x0
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mov w0, 'm'
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bl debug_putc
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mov w0, '1'
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bl debug_putc
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adrp x1, _stack_bot
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mov sp, x1
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mov w0, 'n'
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bl debug_putc
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adrp x0, _base
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mov x10, x0
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adrp x1, _rela_start
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add x1, x1, :lo12:_rela_start
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adrp x2, _rela_end
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add x2, x2, :lo12:_rela_end
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bl apply_rela
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mov w0, '1'
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bl debug_putc
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mov w0, '\r'
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bl debug_putc
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mov w0, '\n'
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bl debug_putc
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mov x0, x9
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mov x1, x10
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bl _start_c
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b .
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.globl debug_putc
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.type debug_putc, @function
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debug_putc:
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ldr x1, =UART_BASE
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1:
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ldr w2, [x1, UTRSTAT]
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tst w2, #2
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beq 1b
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str w0, [x1, UTXH]
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ret
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.pool
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