| /* $Id: console.c,v 1.1 2001/05/25 14:41:26 bencollins Exp $ |
| * console.c: Routines that deal with sending and receiving IO |
| * to/from the current console device using the PROM. |
| * |
| * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) |
| * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| */ |
| |
| #include <promlib.h> |
| |
| /* Non blocking get character from console input device, returns -1 |
| * if no input was taken. This can be used for polling. |
| */ |
| int |
| prom_nbgetchar(void) |
| { |
| static char inc; |
| int i = -1; |
| |
| switch(prom_vers) { |
| case PROM_V0: |
| i = (*(romvec->pv_nbgetchar))(); |
| break; |
| case PROM_V2: |
| case PROM_V3: |
| if((*(romvec->pv_v2devops).v2_dev_read)(prom_stdin , &inc, 1) == 1) |
| i = inc; |
| break; |
| case PROM_P1275: |
| if (p1275_cmd ("read", 3, prom_stdin, &inc, 1) == 1) |
| i = inc; |
| break; |
| } |
| return i; |
| } |
| |
| /* Non blocking put character to console device, returns -1 if |
| * unsuccessful. |
| */ |
| int |
| prom_nbputchar(char c) |
| { |
| static char outc; |
| int i = -1; |
| |
| switch(prom_vers) { |
| case PROM_V0: |
| i = (*(romvec->pv_nbputchar))(c); |
| break; |
| case PROM_V2: |
| case PROM_V3: |
| outc = c; |
| if( (*(romvec->pv_v2devops).v2_dev_write)(prom_stdout, &outc, 1) == 1) |
| i = 0; |
| break; |
| case PROM_P1275: |
| outc = c; |
| if (p1275_cmd ("write", 3, prom_stdout, &outc, 1) == 1) |
| i = 0; |
| break; |
| } |
| return i; |
| } |
| |
| /* Blocking version of get character routine above. */ |
| char |
| prom_getchar(void) |
| { |
| int character; |
| while((character = prom_nbgetchar()) == -1) ; |
| return (char) character; |
| } |
| |
| /* Blocking version of put character routine above. */ |
| void |
| prom_putchar(char c) |
| { |
| if (prom_vers == PROM_P1275) |
| prom_nbputchar(c); |
| else |
| while(prom_nbputchar(c) == -1) ; |
| } |
| |
| void |
| prom_puts (char *s, int len) |
| { |
| switch(prom_vers) { |
| case PROM_V0: |
| case PROM_V2: |
| (*(romvec->pv_printf))(s); |
| break; |
| case PROM_V3: |
| (*(romvec->pv_v2devops).v2_dev_write)(prom_stdout, s, len); |
| break; |
| case PROM_P1275: |
| p1275_cmd ("write", 3, prom_stdout, s, len); |
| break; |
| } |
| } |