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Make the SC_NO_SUSPEND_VTYSWITCH kernel option available as a loader

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tunable and sysctl (hw.syscons.sc_no_suspend_vtswitch).
This commit is contained in:
Matthew N. Dodd 2003-01-15 03:45:27 +00:00
parent e44ed48582
commit dcb65c595d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=109279
1 changed files with 19 additions and 9 deletions
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28
sys/isa/syscons_isa.c
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@ -36,7 +36,7 @@
#include <sys/cons.h>
#include <sys/kbio.h>
#include <sys/consio.h>
#include <sys/sysctl.h>
#ifdef __i386__
@ -64,6 +64,17 @@
static devclass_t sc_devclass;
static sc_softc_t main_softc;
#ifdef SC_NO_SUSPEND_VTYSWITCH
static int sc_no_suspend_vtswitch = 1;
#else
static int sc_no_suspend_vtswitch = 0;
#endif
static int sc_cur_scr;
TUNABLE_INT("hw.syscons.sc_no_suspend_vtswitch", (int *)&sc_no_suspend_vtswitch);
SYSCTL_DECL(_hw_syscons);
SYSCTL_INT(_hw_syscons, OID_AUTO, sc_no_suspend_vtswitch, CTLFLAG_RW,
&sc_no_suspend_vtswitch, 0, "Disable VT switch before suspend.");
static void
scidentify (driver_t *driver, device_t parent)
@ -88,20 +99,19 @@ scattach(device_t dev)
return sc_attach_unit(device_get_unit(dev), device_get_flags(dev));
}
#ifndef SC_NO_SUSPEND_VTYSWITCH
static int sc_cur_scr;
#endif
static int
scsuspend(device_t dev)
{
#ifndef SC_NO_SUSPEND_VTYSWITCH
int retry = 10;
static int dummy;
sc_softc_t *sc;
sc = &main_softc;
sc_cur_scr = sc->cur_scp->index;
if (sc_no_suspend_vtswitch)
return (0);
do {
sc_switch_scr(sc, 0);
if (!sc->switch_in_progress) {
@ -110,20 +120,20 @@ scsuspend(device_t dev)
tsleep(&dummy, 0, "scsuspend", 100);
} while (retry--);
#endif
return (0);
}
static int
scresume(device_t dev)
{
#ifndef SC_NO_SUSPEND_VTYSWITCH
sc_softc_t *sc;
if (sc_no_suspend_vtswitch)
return (0);
sc = &main_softc;
sc_switch_scr(sc, sc_cur_scr);
#endif
return (0);
}