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Implement a db_trap_callback which turns off the watchdog on entry to DDB 

and turns it back on on exit.  Hook the callback in early in the boot, so
it's there as soon as DDB is available.
This commit is contained in:
rafal 2001-06-13 12:34:24 +00:00
parent c03a48d64f
commit 68306a9bf0
1 changed files with 39 additions and 1 deletions
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40
sys/arch/sgimips/sgimips/machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.16 2001/06/02 18:09:20 chs Exp $ */
/* $NetBSD: machdep.c,v 1.17 2001/06/13 12:34:24 rafal Exp $ */
/*
* Copyright (c) 2000 Soren S. Jorvang
@ -143,6 +143,8 @@ static void unimpl_iointr(unsigned, unsigned, unsigned, unsigned);
static void unimpl_intr_establish(int, int, int (*)(void *), void *);
static unsigned nullwork(void);
void ddb_trap_hook(int where);
struct platform platform = {
1000000,
unimpl_bus_reset,
@ -239,6 +241,9 @@ mach_init(argc, argv, envp)
#endif
}
/* Set up DDB hook to turn off watchdog on entry */
db_trap_callback = ddb_trap_hook;
#ifdef DDB
if (boothowto & RB_KDB)
Debugger();
@ -686,3 +691,36 @@ void unconfigured_system_type(int ipnum)
panic("Kernel not configured for current hardware!");
}
void ddb_trap_hook(int where)
{
switch (where) {
case 1: /* Entry to DDB, turn watchdog off */
switch (mach_type) {
case MACH_SGI_IP32:
*(volatile u_int32_t *)0xb4000034 = 0;
*(volatile u_int32_t *)0xb400000c &= ~0x200;
break;
case MACH_SGI_IP22:
*(volatile u_int32_t *)0xbfa00014 = 0;
*(volatile u_int32_t *)0xbfa00004 &= ~0x100;
break;
}
break;
case 0: /* Exit from DDB, turn watchdog back on */
switch (mach_type) {
case MACH_SGI_IP32:
*(volatile u_int32_t *)0xb400000c |= 0x200;
*(volatile u_int32_t *)0xb4000034 = 0;
break;
case MACH_SGI_IP22:
*(volatile u_int32_t *)0xbfa00004 |= 0x100;
*(volatile u_int32_t *)0xbfa00014 = 0;
break;
}
break;
}
}