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50 lines
1.0 KiB
C
50 lines
1.0 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 put character to console device, returns -1 if
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* unsuccessful.
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*/
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static int prom_nbputchar(const char *buf)
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{
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unsigned long args[7];
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args[0] = (unsigned long) "write";
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args[1] = 3;
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args[2] = 1;
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args[3] = (unsigned int) prom_stdout;
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args[4] = (unsigned long) buf;
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args[5] = 1;
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args[6] = (unsigned long) -1;
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p1275_cmd_direct(args);
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if (args[6] == 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 put character routine above. */
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void prom_putchar(const char *buf)
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{
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while (1) {
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int err = prom_nbputchar(buf);
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if (!err)
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break;
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}
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}
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