/*
|
/*
|
* mbx-inbyte.c -- inbyte function for targets using the eppcbug monitor
|
* mbx-inbyte.c -- inbyte function for targets using the eppcbug monitor
|
*
|
*
|
* Copyright (c) 1998 Cygnus Support
|
* Copyright (c) 1998 Cygnus Support
|
*
|
*
|
* The authors hereby grant permission to use, copy, modify, distribute,
|
* The authors hereby grant permission to use, copy, modify, distribute,
|
* and license this software and its documentation for any purpose, provided
|
* and license this software and its documentation for any purpose, provided
|
* that existing copyright notices are retained in all copies and that this
|
* that existing copyright notices are retained in all copies and that this
|
* notice is included verbatim in any distributions. No written agreement,
|
* notice is included verbatim in any distributions. No written agreement,
|
* license, or royalty fee is required for any of the authorized uses.
|
* license, or royalty fee is required for any of the authorized uses.
|
* Modifications to this software may be copyrighted by their authors
|
* Modifications to this software may be copyrighted by their authors
|
* and need not follow the licensing terms described here, provided that
|
* and need not follow the licensing terms described here, provided that
|
* the new terms are clearly indicated on the first page of each file where
|
* the new terms are clearly indicated on the first page of each file where
|
* they apply.
|
* they apply.
|
*/
|
*/
|
|
|
#include "ppc-asm.h"
|
#include "ppc-asm.h"
|
|
|
int inbyte(void)
|
int inbyte(void)
|
{
|
{
|
struct {
|
struct {
|
unsigned clun;
|
unsigned clun;
|
unsigned dlun;
|
unsigned dlun;
|
char *data;
|
char *data;
|
unsigned len;
|
unsigned len;
|
unsigned rsrvd;
|
unsigned rsrvd;
|
char buf[4];
|
char buf[4];
|
} ipb, *inpb;
|
} ipb, *inpb;
|
|
|
struct {
|
struct {
|
int status;
|
int status;
|
int cnt;
|
int cnt;
|
} opb, *outpb;
|
} opb, *outpb;
|
|
|
inpb = &ipb;
|
inpb = &ipb;
|
outpb = &opb;
|
outpb = &opb;
|
|
|
do {
|
do {
|
inpb->clun = 0;
|
inpb->clun = 0;
|
inpb->dlun = 0;
|
inpb->dlun = 0;
|
inpb->data = ipb.buf;
|
inpb->data = ipb.buf;
|
inpb->len = 1;
|
inpb->len = 1;
|
inpb->rsrvd = 0;
|
inpb->rsrvd = 0;
|
|
|
asm volatile (
|
asm volatile (
|
"mr 3,%0\n"
|
"mr 3,%0\n"
|
"mr 4,%1\n"
|
"mr 4,%1\n"
|
"li 10,0x200\n"
|
"li 10,0x200\n"
|
"sc"
|
"sc"
|
: /* no outputs */
|
: /* no outputs */
|
: "r" (inpb), "r" (outpb)
|
: "r" (inpb), "r" (outpb)
|
: "3", "4", "10"
|
: "3", "4", "10"
|
);
|
);
|
} while (outpb->status == 0 && outpb->cnt == 0);
|
} while (outpb->status == 0 && outpb->cnt == 0);
|
|
|
if (outpb->status == 0)
|
if (outpb->status == 0)
|
return ipb.buf[0] & 0xff;
|
return ipb.buf[0] & 0xff;
|
|
|
return -1;
|
return -1;
|
}
|
}
|
|
|
