83 lines
1.6 KiB
C
83 lines
1.6 KiB
C
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/*
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* Functions to provide access to special i386 instructions.
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* XXX - bezillions more are defined in locore.s but are not declared anywhere.
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#ifdef __GNUC__
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static __inline int bdb(void)
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{
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extern int bdb_exists;
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if (!bdb_exists)
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return (0);
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__asm("int $3");
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return (1);
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}
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static __inline void
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disable_intr(void)
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{
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__asm __volatile("cli");
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}
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static __inline void
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enable_intr(void)
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{
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__asm __volatile("sti");
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}
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/*
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* This roundabout method of returning a u_char helps stop gcc-1.40 from
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* generating unnecessary movzbl's.
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*/
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#define inb(port) ((u_char) u_int_inb(port))
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static __inline u_int
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u_int_inb(u_int port)
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{
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u_char data;
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/*
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* We use %%dx and not %1 here because i/o is done at %dx and not at
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* %edx, while gcc-2.2.2 generates inferior code (movw instead of movl)
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* if we tell it to load (u_short) port.
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*/
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__asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
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return data;
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}
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static __inline void
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outb(u_int port, u_char data)
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{
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register u_char al asm("ax");
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al = data; /* help gcc-1.40's register allocator */
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__asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
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}
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#else /* not __GNUC__ */
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int bdb __P((void));
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void disable_intr __P((void));
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void enable_intr __P((void));
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u_char inb __P((u_int port));
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void outb __P((u_int port, u_int data)); /* XXX - incompat */
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#endif /* __GNUC__ */
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#define really_u_int int /* XXX */
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#define really_void int /* XXX */
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void load_cr0 __P((u_int cr0));
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really_u_int rcr0 __P((void));
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#ifdef notyet
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really_void setidt __P((int idx, /*XXX*/caddr_t func, int typ, int dpl));
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#endif
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#undef really_u_int
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#undef really_void
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