Last change
on this file since 656 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.4 KB
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Line | |
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1 | /* |
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2 | * mbx-inbyte.c -- inbyte function for targets using the eppcbug monitor |
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3 | * |
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4 | * Copyright (c) 1998 Cygnus Support |
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5 | * |
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6 | * The authors hereby grant permission to use, copy, modify, distribute, |
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7 | * and license this software and its documentation for any purpose, provided |
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8 | * that existing copyright notices are retained in all copies and that this |
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9 | * notice is included verbatim in any distributions. No written agreement, |
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10 | * license, or royalty fee is required for any of the authorized uses. |
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11 | * Modifications to this software may be copyrighted by their authors |
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12 | * and need not follow the licensing terms described here, provided that |
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13 | * the new terms are clearly indicated on the first page of each file where |
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14 | * they apply. |
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15 | */ |
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16 | |
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17 | #include "ppc-asm.h" |
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18 | |
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19 | int inbyte(void) |
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20 | { |
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21 | struct { |
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22 | unsigned clun; |
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23 | unsigned dlun; |
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24 | char *data; |
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25 | unsigned len; |
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26 | unsigned rsrvd; |
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27 | char buf[4]; |
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28 | } ipb, *inpb; |
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29 | |
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30 | struct { |
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31 | int status; |
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32 | int cnt; |
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33 | } opb, *outpb; |
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34 | |
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35 | inpb = &ipb; |
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36 | outpb = &opb; |
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37 | |
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38 | do { |
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39 | inpb->clun = 0; |
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40 | inpb->dlun = 0; |
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41 | inpb->data = ipb.buf; |
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42 | inpb->len = 1; |
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43 | inpb->rsrvd = 0; |
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44 | |
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45 | asm volatile ( |
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46 | "mr 3,%0\n" |
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47 | "mr 4,%1\n" |
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48 | "li 10,0x200\n" |
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49 | "sc" |
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50 | : /* no outputs */ |
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51 | : "r" (inpb), "r" (outpb) |
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52 | : "3", "4", "10" |
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53 | ); |
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54 | } while (outpb->status == 0 && outpb->cnt == 0); |
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55 | |
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56 | if (outpb->status == 0) |
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57 | return ipb.buf[0] & 0xff; |
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58 | |
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59 | return -1; |
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60 | } |
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