mirror of https://gitee.com/openkylin/linux.git
75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
/* console.c: Routines that deal with sending and receiving IO
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* to/from the current console device using the PROM.
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*
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* Copyright (C) 1995 David S. Miller (davem@davemloft.net)
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* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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#include <asm/system.h>
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#include <linux/string.h>
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extern int prom_stdin, prom_stdout;
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/* Non blocking get character from console input device, returns -1
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* if no input was taken. This can be used for polling.
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*/
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inline int
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prom_nbgetchar(void)
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{
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char inc;
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if (p1275_cmd("read", P1275_ARG(1,P1275_ARG_OUT_BUF)|
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P1275_INOUT(3,1),
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prom_stdin, &inc, P1275_SIZE(1)) == 1)
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return inc;
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else
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return -1;
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}
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/* Non blocking put character to console device, returns -1 if
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* unsuccessful.
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*/
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inline int
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prom_nbputchar(char c)
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{
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char outc;
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outc = c;
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if (p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
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P1275_INOUT(3,1),
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prom_stdout, &outc, P1275_SIZE(1)) == 1)
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return 0;
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else
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return -1;
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}
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/* Blocking version of get character routine above. */
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char
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prom_getchar(void)
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{
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int character;
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while((character = prom_nbgetchar()) == -1) ;
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return (char) character;
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}
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/* Blocking version of put character routine above. */
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void
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prom_putchar(char c)
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{
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prom_nbputchar(c);
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return;
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}
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void
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prom_puts(const char *s, int len)
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{
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p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
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P1275_INOUT(3,1),
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prom_stdout, s, P1275_SIZE(len));
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}
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