sys/arch/rs6000/stand/boot/io.c

   1 /*      $NetBSD: io.c,v 1.4 2006/06/27 23:26:13 garbled Exp $   */
   2
   3
   4 #include <lib/libsa/stand.h>
   5 #include <sys/bswap.h>
   6 #include "boot.h"
   7
   8 #define POW_IOCC_SEG 0x820C00E0
   9 #define IOCC_SEG 0x82000080
  10 #define PSL_DR  (1<<4)
  11
  12 volatile u_char *MCA_io  = (u_char *)0xe0000000;
  13
  14 /* hardcode for now */
  15 int
  16 setup_iocc(void)
  17 {
  18         register_t savemsr, msr;
  19
  20         __asm volatile ("mfmsr %0" : "=r"(savemsr));
  21         msr = savemsr & ~PSL_DR;
  22         __asm volatile ("mtmsr %0" : : "r"(msr));
  23
  24         __asm volatile ("mtsr 14,%0" : : "r"(IOCC_SEG));
  25         __asm volatile ("mtmsr %0" : : "r"(msr|PSL_DR));
  26         __asm volatile ("isync");
  27         __asm volatile ("mtmsr %0;isync" : : "r"(savemsr));
  28         return 1;
  29 }
  30
  31 void
  32 outb(int port, char val)
  33 {
  34
  35         MCA_io[port] = val;
  36 }
  37
  38 inline void
  39 outw(int port, u_int16_t val)
  40 {
  41         outb(port, val>>8);
  42         outb(port+1, val);
  43 }
  44
  45 u_char
  46 inb(int port)
  47 {
  48
  49         return (MCA_io[port]);
  50 }