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/*
* bug routines -- assumes that the necessary sections of memory
* are preserved.
*/
#include "bug.h"
#define _INCHR "0x00"
#define _INSTAT "0x01"
#define _INLN "0x02"
#define _READSTR "0x03"
#define _READLN "0x04"
#define _OUTCHR "0x20"
#define _OUTSTR "0x21"
#define _OUTLN "0x22"
#define _DSKRD "0x10"
#define _DSKWR "0x11"
#define _DSKCFIG "0x12"
#define _DSKFMT "0x14"
#define _DSKCTRL "0x15"
#define _WRITE "0x23"
#define _WRITELN "0x24"
#define _DELAY "0x43"
#define _RTC_RD "0x53"
#define _RETURN "0x63"
#define _BRD_ID "0x70"
/* BUG - tty routines */
#define BUG_CALL(x) \
asm volatile ("addi r10,r0," x); \
asm volatile ("sc");
char bug_inchr()
{
register char a;
asm volatile ("sub r31,r31,4");
BUG_CALL(_INCHR);
asm volatile ("or %0,r0,r2" : "=r" (a));
return a;
}
/* returns 0 if no characters ready to read */
int bug_instat()
{
short ret;
BUG_CALL(_INSTAT);
asm volatile ("or %0,r0,r2" : "=r" (ret));
return (!(ret & 0x4));
}
void bug_outchr(char a)
{
asm volatile ("or r2, r0, %0" : :"r" (a));
BUG_CALL(_OUTCHR);
return;
}
void bug_outstr(char *pstrb, char *pstre)
{
asm volatile ("or r2,r0,%0": : "r" (pstrb) );
asm volatile ("or r3,r0,%0": : "r" (pstre) );
BUG_CALL(_OUTSTR);
return;
}
void bug_outln(char *pstrb, char *pstre)
{
asm volatile ("or r2,r0,%0": : "r" (pstrb) );
asm volatile ("or r3,r0,%0": : "r" (pstre) );
BUG_CALL(_OUTLN);
return;
}
/* BUG - disk routines */
/* returns 0: success, nonzero: error */
int bug_diskrd(bug_dskio *arg)
{
int ret;
asm volatile ("or r2,r0,%0": : "r" (arg) );
BUG_CALL(_DSKRD);
return (!(ret & 0x4));
}
/* returns 0: success, nonzero: error */
int bug_diskwr(bug_dskio *arg)
{
int ret;
asm volatile ("or r2,r0,%0": : "r" (arg) );
BUG_CALL(_DSKWR);
return (!(ret & 0x4));
}
#ifdef NOTYET
bug_diskcfig()
{
}
bug_diskfmt(){}
bug_diskctrl(){}
#endif
/* BUG - timing routine */
void bug_delay(int delay_msec)
{
asm volatile ("or r2,r0,%0": : "r" (delay_msec) );
BUG_CALL(_DELAY);
return ;
}
/* BUG - return to bug routine */
void bug_return()
{
BUG_CALL(_RETURN);
/*NOTREACHED*/
}
/* BUG - query board routines */
struct bug_brdid *bug_brdid()
{
struct bug_brdid *pbrd_id;
BUG_CALL(_BRD_ID);
asm volatile ("or %0,r0,r2": "=r" (pbrd_id):);
return pbrd_id;
}
void bug_rtc_rd(struct bug_time *ptime)
{
asm volatile ("or r2,r0,%0": : "r" (ptime));
BUG_CALL(_RTC_RD);
return;
}
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