56 lines
927 B
C
56 lines
927 B
C
/* default reentrant pointer when multithread enabled */
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#include <_ansi.h>
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#include <string.h>
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#include <reent.h>
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static inline
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void *user_alloc(int size)
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{
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void *val;
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__asm__ __volatile__(
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"int $0x40"
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:"=eax"(val)
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:"a"(68),"b"(12),"c"(size));
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return val;
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}
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void init_reent()
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{
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struct _reent *ent;
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ent = user_alloc(sizeof(struct _reent));
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_REENT_INIT_PTR(ent);
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__asm__ __volatile__(
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"movl %0, %%fs:12"
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::"r"(ent));
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__sinit(ent);
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}
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void __mutex_lock(volatile int *val)
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{
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int tmp;
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__asm__ __volatile__ (
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"0:\n\t"
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"mov %0, %1\n\t"
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"testl %1, %1\n\t"
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"jz 1f\n\t"
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"movl $68, %%eax\n\t"
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"movl $1, %%ebx\n\t"
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"int $0x40\n\t"
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"jmp 0b\n\t"
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"1:\n\t"
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"incl %1\n\t"
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"xchgl %0, %1\n\t"
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"testl %1, %1\n\t"
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"jnz 0b\n"
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: "+m" (*val), "=&r"(tmp)
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::"eax","ebx" );
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}
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