boot/ppc/pegasos.floppy/isa.c

   1 #include "isa.h"
   2
   3 #define ISA_REG_PTR(x) ((void *)(0xfe000000 | (x)))
   4
   5 void isa_write8(unsigned short port, unsigned char val)
   6 {
   7         *(char *)ISA_REG_PTR(port) = val;
   8 }
   9
  10 void isa_write16(unsigned short port, unsigned short val)
  11 {
  12         *(short *)ISA_REG_PTR(port) = val;
  13 }
  14
  15 void isa_write32(unsigned short port, unsigned int val)
  16 {
  17         *(int *)ISA_REG_PTR(port) = val;
  18 }
  19
  20 unsigned char isa_read8(unsigned short port)
  21 {
  22         return *(char *)ISA_REG_PTR(port);
  23 }
  24
  25 unsigned short isa_read16(unsigned short port)
  26 {
  27         return *(short *)ISA_REG_PTR(port);
  28 }
  29
  30 unsigned int isa_read32(unsigned short port)
  31 {
  32         return *(int *)ISA_REG_PTR(port);
  33 }