d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add a new cn_flags fields to struct consdev, the low-level console

Browse Source 
definition structure.  Define one flag, CN_FLAG_NODEBUG, which
indicates the console driver cannot be used in the context of the
debugger.  This may be used, for example, if the console device
interacts with kernel services that cannot be used from the
debugger context, such as the network stack.  These drivers are
skipped over for calls to cn_checkc() and cn_putc(), and the
calling function simply moves on to the next available console.
This commit is contained in:
rwatson 2003-10-18 02:13:39 +00:00
parent 6e7bb23023
commit 7108a194c1
2 changed files with 14 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
sys/kern/tty_cons.c
View File

@ -538,9 +538,11 @@ cncheckc(void)
return (-1);
STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
cn = cnd->cnd_cn;
c = cn->cn_checkc(cn);
if (c != -1) {
return (c);
if (!db_active || (cn->cn_flags & CN_FLAG_NODEBUG)) {
c = cn->cn_checkc(cn);
if (c != -1) {
return (c);
}
}
}
return (-1);
@ -557,9 +559,11 @@ cnputc(int c)
return;
STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
cn = cnd->cnd_cn;
if (c == '\n')
cn->cn_putc(cn, '\r');
cn->cn_putc(cn, c);
if (!db_active || (cn->cn_flags & CN_FLAG_NODEBUG)) {
if (c == '\n')
cn->cn_putc(cn, '\r');
cn->cn_putc(cn, c);
}
}
#ifdef DDB
if (console_pausing && !db_active && (c == '\n')) {

4
sys/sys/cons.h
View File

@ -70,6 +70,7 @@ struct consdev {
short cn_pri; /* pecking order; the higher the better */
void *cn_arg; /* drivers method argument */
int cn_unit; /* some drivers prefer this */
int cn_flags; /* capabilities of this console */
char cn_name[SPECNAMELEN + 1]; /* console (device) name */
};
@ -80,6 +81,9 @@ struct consdev {
#define CN_INTERNAL 3 /* "internal" bit-mapped display */
#define CN_REMOTE 4 /* serial interface with remote bit set */
/* Values for cn_flags. */
#define CN_FLAG_NODEBUG 0x00000001 /* Not supported with debugger. */
#ifdef _KERNEL
extern int cons_unavail;