c73fcc846c
The current scheme works on static interpretation of text names, which
is wrong.
The output-device setting, for example, must be resolved via an alias
or similar to a full path name to the console device.
Paths also contain an optional set of 'options', which starts with a
colon at the end of the path. The option area is used to specify
which of two serial ports ('a' or 'b') the path refers to when a
device node drives multiple ports. 'a' is assumed if the option
specification is missing.
This was caught by the UltraSPARC-T1 simulator. The 'output-device'
property was set to 'ttya' and we didn't pick upon the fact that this
is an OBP alias set to '/virtual-devices/console'. Instead we saw it
as the first serial console device, instead of the hypervisor console.
The infrastructure is now there to take advantage of this to resolve
the console correctly even in multi-head situations in fbcon too.
Thanks to Greg Onufer for the bug report.
Signed-off-by: David S. Miller <davem@davemloft.net>
105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
/* $Id: console.c,v 1.25 2001/10/30 04:54:22 davem Exp $
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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/sun4prom.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 void restore_current(void);
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static char con_name_jmc[] = "/obio/su@"; /* "/obio/su@0,3002f8"; */
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#define CON_SIZE_JMC (sizeof(con_name_jmc))
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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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int
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prom_nbgetchar(void)
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{
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static char inc;
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int i = -1;
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unsigned long flags;
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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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case PROM_SUN4:
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i = (*(romvec->pv_nbgetchar))();
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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_read)(*romvec->pv_v2bootargs.fd_stdin , &inc, 0x1) == 1) {
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i = inc;
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} else {
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i = -1;
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}
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break;
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default:
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i = -1;
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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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/* Non blocking put character to console device, returns -1 if
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* unsuccessful.
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*/
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int
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prom_nbputchar(char c)
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{
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static char outc;
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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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case PROM_SUN4:
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i = (*(romvec->pv_nbputchar))(c);
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break;
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case PROM_V2:
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case PROM_V3:
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outc = c;
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if( (*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout, &outc, 0x1) == 1)
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i = 0;
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else
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i = -1;
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break;
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default:
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i = -1;
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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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/* 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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while(prom_nbputchar(c) == -1) ;
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return;
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}
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