os

Toy OS
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io.h (1104B)

      1 #ifndef _IO_H_
      2 #define _IO_H_
      3 
      4 #include <u.h>
      5 
      6 static inline u_int8_t
      7 inb(u_int16_t port)
      8 {
      9 	u_int8_t res;
     10 
     11 	__asm__ __volatile("in %%dx, %%al" : "=a" (res) : "d" (port));
     12 	return (res);
     13 }
     14 
     15 static inline void
     16 outb(u_int16_t port, u_int8_t v)
     17 {
     18 	__asm__ __volatile("out %%al, %%dx" : : "a" (v), "d" (port));
     19 }
     20 
     21 static inline u_int16_t
     22 inw(u_int16_t port)
     23 {
     24 	u_int16_t res;
     25 
     26 	__asm__ __volatile("in %%dx, %%ax" : "=a" (res) : "d" (port));
     27 	return (res);
     28 }
     29 
     30 static inline void
     31 outw(u_int16_t port, u_int16_t v)
     32 {
     33 	__asm__ __volatile("out %%ax, %%dx" : : "a" (v), "d" (port));
     34 }
     35 
     36 static inline u_int32_t
     37 inl(u_int16_t port)
     38 {
     39 	u_int32_t res;
     40 
     41 	__asm__ __volatile("in %%dx, %%eax" : "=a" (res) : "d" (port));
     42 	return (res);
     43 }
     44 
     45 static inline void
     46 outl(u_int16_t port, u_int32_t v)
     47 {
     48 	__asm__ __volatile("out %%eax, %%dx" : : "a" (v), "d" (port));
     49 }
     50 
     51 static inline void
     52 hlt(void)
     53 {
     54 	__asm__ __volatile("hlt");
     55 }
     56 
     57 static inline void
     58 cli(void)
     59 {
     60 	__asm__ __volatile("cli");
     61 }
     62 
     63 static inline void
     64 sti(void)
     65 {
     66 	__asm__ __volatile("sti");
     67 }
     68 
     69 static inline void
     70 io_wait(void)
     71 {
     72 	outb(0x80, 0);
     73 }
     74 
     75 #endif /* _IO_H_ */