toolchain/gcc/libgloss/zpu/crt_io.c

   1 #include <syscall.h>
   2 #include <stdio.h>
   3 #include <errno.h>
   4 #include <sys/stat.h>
   5
   6 extern int _hardware;
   7 /* _cpu_config==0 => Abel
   8  * _cpu_config==1 => Zeta
   9  * _cpu_config==2 => Phi
  10  */
  11 extern int _cpu_config;
  12 static volatile int *UART;
  13 static volatile int *TIMER;
  14 volatile int *MHZ;
  15
  16
  17
  18 /*
  19  * Wait indefinitely for input byte
  20  */
  21
  22
  23 int __attribute__ ((weak)) inbyte()
  24 {
  25         int val;
  26         for (;;)
  27         {
  28                 val=UART[1];
  29                 if ((val&0x100)!=0)
  30                 {
  31                         return val&0xff;
  32                 }
  33         }
  34 }
  35
  36
  37
  38 /*
  39  * Output one character to the serial port
  40  *
  41  *
  42  */
  43 void __attribute__ ((weak)) outbyte(int c)
  44 {
  45         /* Wait for space in FIFO */
  46         while ((UART[0]&0x100)==0);
  47         UART[0]=c;
  48 }
  49
  50 static const int mhz=64;
  51
  52 void __attribute__ ((weak)) _initIO(void)
  53 {
  54         if (_hardware)
  55         {
  56                 if (_cpu_config==2)
  57                 {
  58                         /* Phi board addresses */
  59                         UART=(volatile int *)0x080a000c;
  60                         TIMER=(volatile int *)0x080a0014;
  61                         MHZ=(volatile int *)&mhz;
  62                 } else
  63                 {
  64                         /* Abel board */
  65                         UART=(volatile int *)0xc000;
  66                         TIMER=(volatile int *)0x9000;
  67                         MHZ=(volatile int *)0x8800;
  68                 }
  69         } else
  70         {
  71                 UART=(volatile int *)0x80000024;
  72                 TIMER=(volatile int *)0x80000100;
  73                 MHZ=(volatile int *)0x80000200;
  74         }
  75 }
  76
  77
  78
  79 long long __attribute__ ((weak)) _readCycles()
  80 {
  81         long long clock;
  82         unsigned int i;
  83
  84         TIMER[0]=0x2; /* sample timer */
  85         clock=0;
  86         for (i=0; i<2; i++)
  87         {
  88                 clock|=((long long )(TIMER[i]))<<(i*32);
  89         }
  90         return clock;
  91 }