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https://github.com/KolibriOS/kolibrios.git
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51 lines
869 B
ArmAsm
51 lines
869 B
ArmAsm
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.section .text
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.global ___io_alloc
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.global ___io_free
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.global ___io_tab
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.align 8
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___io_alloc:
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pushl $__io_mutex
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call ___mutex_lock
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popl %eax
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xorl %ecx, %ecx
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bsfl __io_map, %eax
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jnz .done
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movl $32, %ecx
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bsfl __io_map+4, %eax
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jnz .done
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xorl %eax, %eax
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mov %eax, __io_mutex
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notl %eax
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ret
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.done:
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addl %ecx, %eax
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btrl %eax, __io_map
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movl $0, __io_mutex
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ret
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.align 8
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___io_free:
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movl 4(%esp), %eax
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bts %eax, __io_map
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ret
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.section .data
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__io_map: .long(0xFFFFFFFF)
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.long(0xFFFFFFFF)
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.section .bss
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.align 16
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___io_tab: .space 64*24
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__io_mutex: .space 4
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