kolibrios-fun/contrib/sdk/sources/newlib/libc/sys/io_alloc.S
Sergey Semyonov (Serge) 7315bb05c0 newlib-2.1.0
git-svn-id: svn://kolibrios.org@4921 a494cfbc-eb01-0410-851d-a64ba20cac60
2014-05-10 22:12:19 +00:00

51 lines
869 B
ArmAsm

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