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/*
* Copyright (c) 1988-1994, The University of Utah and
* the Computer Systems Laboratory (CSL). All rights reserved.
*
* Permission to use, copy, modify and distribute this software is hereby
* granted provided that (1) source code retains these copyright, permission,
* and disclaimer notices, and (2) redistributions including binaries
* reproduce the notices in supporting documentation, and (3) all advertising
* materials mentioning features or use of this software display the following
* acknowledgement: ``This product includes software developed by the
* Computer Systems Laboratory at the University of Utah.''
*
* THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
* IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
* ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* CSL requests users of this software to return to csl-dist@cs.utah.edu any
* improvements that they make and grant CSL redistribution rights.
*
* Utah $Hdr: cons.c 1.14 94/12/14$
*/
#include <string.h>
#include <kern/debug.h>
#include <sys/types.h>
#include <device/conf.h>
#include <mach/boolean.h>
#include <device/cons.h>
#ifdef MACH_KMSG
#include <device/io_req.h>
#include <device/kmsg.h>
#endif /* MACH_KMSG */
static boolean_t cn_inited = FALSE;
static struct consdev *cn_tab = 0; /* physical console device info */
/*
* ROM getc/putc primitives.
* On some architectures, the boot ROM provides basic character input/output
* routines that can be used before devices are configured or virtual memory
* is enabled. This can be useful to debug (or catch panics from) code early
* in the bootstrap procedure.
*/
int (*romgetc)(char c) = 0;
void (*romputc)(char c) = 0;
#if CONSBUFSIZE > 0
/*
* Temporary buffer to store console output before a console is selected.
* This is statically allocated so it can be called before malloc/kmem_alloc
* have been initialized. It is initialized so it won't be clobbered as
* part of the zeroing of BSS (on PA/Mach).
*/
static char consbuf[CONSBUFSIZE] = { 0 };
static char *consbp = consbuf;
static boolean_t consbufused = FALSE;
#endif /* CONSBUFSIZE > 0 */
void
cninit()
{
struct consdev *cp;
dev_ops_t cn_ops;
int x;
if (cn_inited)
return;
/*
* Collect information about all possible consoles
* and find the one with highest priority
*/
for (cp = constab; cp->cn_probe; cp++) {
(*cp->cn_probe)(cp);
if (cp->cn_pri > CN_DEAD &&
(cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
cn_tab = cp;
}
/*
* Found a console, initialize it.
*/
if ((cp = cn_tab)) {
/*
* Initialize as console
*/
(*cp->cn_init)(cp);
/*
* Look up its dev_ops pointer in the device table and
* place it in the device indirection table.
*/
if (dev_name_lookup(cp->cn_name, &cn_ops, &x) == FALSE)
panic("cninit: dev_name_lookup failed");
dev_set_indirection("console", cn_ops, minor(cp->cn_dev));
#if CONSBUFSIZE > 0
/*
* Now that the console is initialized, dump any chars in
* the temporary console buffer.
*/
if (consbufused) {
char *cbp = consbp;
do {
if (*cbp)
cnputc(*cbp);
if (++cbp == &consbuf[CONSBUFSIZE])
cbp = consbuf;
} while (cbp != consbp);
consbufused = FALSE;
}
#endif /* CONSBUFSIZE > 0 */
cn_inited = TRUE;
return;
}
/*
* No console device found, not a problem for BSD, fatal for Mach
*/
panic("can't find a console device");
}
int
cngetc()
{
if (cn_tab)
return ((*cn_tab->cn_getc)(cn_tab->cn_dev, 1));
if (romgetc)
return ((*romgetc)(1));
return (0);
}
int
cnmaygetc()
{
if (cn_tab)
return((*cn_tab->cn_getc)(cn_tab->cn_dev, 0));
if (romgetc)
return ((*romgetc)(0));
return (0);
}
void
cnputc(c)
char c;
{
if (c == 0)
return;
#ifdef MACH_KMSG
/* XXX: Assume that All output routines always use cnputc. */
kmsg_putchar (c);
#endif
#if defined(MACH_HYP) && 0
{
/* Also output on hypervisor's emergency console, for
* debugging */
unsigned char d = c;
hyp_console_write(&d, 1);
}
#endif /* MACH_HYP */
if (cn_tab) {
(*cn_tab->cn_putc)(cn_tab->cn_dev, c);
if (c == '\n')
(*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
} else if (romputc) {
(*romputc)(c);
if (c == '\n')
(*romputc)('\r');
}
#if CONSBUFSIZE > 0
else {
if (consbufused == FALSE) {
consbp = consbuf;
consbufused = TRUE;
memset(consbuf, 0, CONSBUFSIZE);
}
*consbp++ = c;
if (consbp >= &consbuf[CONSBUFSIZE])
consbp = consbuf;
}
#endif /* CONSBUFSIZE > 0 */
}
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