/* 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@davemloft.net) * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/sched.h> #include <asm/openprom.h> #include <asm/oplib.h> #include <asm/system.h> #include <linux/string.h> extern int prom_stdin, prom_stdout; /* Non blocking get character from console input device, returns -1 * if no input was taken. This can be used for polling. */ inline int prom_nbgetchar(void) { char inc; if (p1275_cmd("read", P1275_ARG(1,P1275_ARG_OUT_BUF)| P1275_INOUT(3,1), prom_stdin, &inc, P1275_SIZE(1)) == 1) return inc; else return -1; } /* Non blocking put character to console device, returns -1 if * unsuccessful. */ inline int prom_nbputchar(char c) { char outc; outc = c; if (p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)| P1275_INOUT(3,1), prom_stdout, &outc, P1275_SIZE(1)) == 1) return 0; else return -1; } /* 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) { prom_nbputchar(c); return; } void prom_puts(const char *s, int len) { p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)| P1275_INOUT(3,1), prom_stdout, s, P1275_SIZE(len)); }