1 /* 2 * Functions to provide access to special i386 instructions. 3 * XXX - bezillions more are defined in locore.s but are not declared anywhere. 4 */ 5 6 #include <sys/cdefs.h> 7 #include <sys/types.h> 8 9 #ifdef __GNUC__ 10 11 static __inline int bdb(void) 12 { 13 extern int bdb_exists; 14 15 if (!bdb_exists) 16 return (0); 17 __asm("int $3"); 18 return (1); 19 } 20 21 static __inline void 22 disable_intr(void) 23 { 24 __asm __volatile("cli"); 25 } 26 27 static __inline void 28 enable_intr(void) 29 { 30 __asm __volatile("sti"); 31 } 32 33 /* 34 * This roundabout method of returning a u_char helps stop gcc-1.40 from 35 * generating unnecessary movzbl's. 36 */ 37 #define inb(port) ((u_char) u_int_inb(port)) 38 39 static __inline u_int 40 u_int_inb(u_int port) 41 { 42 u_char data; 43 /* 44 * We use %%dx and not %1 here because i/o is done at %dx and not at 45 * %edx, while gcc-2.2.2 generates inferior code (movw instead of movl) 46 * if we tell it to load (u_short) port. 47 */ 48 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 49 return data; 50 } 51 52 static __inline void 53 outb(u_int port, u_char data) 54 { 55 register u_char al asm("ax"); 56 57 al = data; /* help gcc-1.40's register allocator */ 58 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 59 } 60 61 #else /* not __GNUC__ */ 62 63 int bdb __P((void)); 64 void disable_intr __P((void)); 65 void enable_intr __P((void)); 66 u_char inb __P((u_int port)); 67 void outb __P((u_int port, u_int data)); /* XXX - incompat */ 68 69 #endif /* __GNUC__ */ 70 71 #define really_u_int int /* XXX */ 72 #define really_void int /* XXX */ 73 74 void load_cr0 __P((u_int cr0)); 75 really_u_int rcr0 __P((void)); 76 77 #ifdef notyet 78 really_void setidt __P((int idx, /*XXX*/caddr_t func, int typ, int dpl)); 79 #endif 80 81 #undef really_u_int 82 #undef really_void 83