58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* 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@caip.rutgers.edu)
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* Copyright (C) 1998 Pete Zaitcev <zaitcev@yahoo.com>
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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 <linux/string.h>
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extern void restore_current(void);
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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 flags;
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int i = -1;
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spin_lock_irqsave(&prom_lock, flags);
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switch(prom_vers) {
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case PROM_V0:
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if ((*(romvec->pv_nbputchar))(*buf))
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i = 1;
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break;
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case PROM_V2:
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case PROM_V3:
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if ((*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout,
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buf, 0x1) == 1)
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i = 1;
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break;
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default:
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break;
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}
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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return i; /* Ugh, we could spin forever on unsupported proms ;( */
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}
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void prom_console_write_buf(const char *buf, int len)
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{
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while (len) {
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int n = prom_nbputchar(buf);
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if (n < 0)
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continue;
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len--;
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buf++;
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}
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}
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