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(1) Remove old trap definitions, define trap and interrupt handling 

more naturally in terms of way the OSF/1 PALcode delivers traps and
interrupts.  Clean up fault/exception handling code and system entry
points.  Seperate ASTs into a seperate C function.
(2)     Add a boot flag ('H' and 'h') to make sure the kernel never
reboots after panic.  Useful for debugging kernels which panic early
on after user processes have started, to fend off infinite reboot cycles.
Sort boot flag switch.
(3)     Add unaligned access fixup code to fix unaligned quad, long,
and IEEE S and T floating datum loads and stores.  VAX floating data
types not yet supported, and in the future will only be supported if
FIX_UNALIGNED_VAX_FP is defined.  (No point in wasting the space when
most of the time there will never be VAX FP loads and stores.)  Right
now, these features can be controlled only by sysctl.  The (boolean)
integer sysctls machdep.unaligned_print, machdep.unaligned_fix, and
machdep.unaligned_sigbus control printing about unaligned accesses
(defaults on), fixing up of unaligned accesses (defaults on), and
forcing a SIGBUS on unaligned accesses (defaults off).  If an access
is not fixed up (for lack of method or explicit decision), a SIGBUS is
always generated to keep programs from using bogus data.  At some point,
these three choices should be controlled by per-process flags, as well.
This commit is contained in:
cgd 1996-07-14 04:21:33 +00:00
parent 2db316d75f
commit b431daf1d1
1 changed files with 42 additions and 12 deletions
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54
sys/arch/alpha/alpha/machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.35 1996/07/11 20:14:19 cgd Exp $ */
/* $NetBSD: machdep.c,v 1.36 1996/07/14 04:21:33 cgd Exp $ */
/*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
@ -186,9 +186,12 @@ char *cpu_iobus;
char boot_flags[64];
/* for cpu_sysctl() */
char root_device[17];
char root_device[17];
int alpha_unaligned_print = 1; /* warn about unaligned accesses */
int alpha_unaligned_fix = 1; /* fix up unaligned accesses */
int alpha_unaligned_sigbus = 0; /* don't SIGBUS on fixed-up accesses */
void identifycpu();
void identifycpu();
int
alpha_init(pfn, ptb)
@ -232,12 +235,18 @@ alpha_init(pfn, ptb)
/*
* Point interrupt/exception vectors to our own.
*/
alpha_pal_wrent(XentInt, 0);
alpha_pal_wrent(XentArith, 1);
alpha_pal_wrent(XentMM, 2);
alpha_pal_wrent(XentIF, 3);
alpha_pal_wrent(XentUna, 4);
alpha_pal_wrent(XentSys, 5);
alpha_pal_wrent(XentInt, ALPHA_KENTRY_INT);
alpha_pal_wrent(XentArith, ALPHA_KENTRY_ARITH);
alpha_pal_wrent(XentMM, ALPHA_KENTRY_MM);
alpha_pal_wrent(XentIF, ALPHA_KENTRY_IF);
alpha_pal_wrent(XentUna, ALPHA_KENTRY_UNA);
alpha_pal_wrent(XentSys, ALPHA_KENTRY_SYS);
/*
* Disable System and Processor Correctable Error reporting.
* Clear pending machine checks and error reports, etc.
*/
alpha_pal_wrmces(alpha_pal_rdmces() | ALPHA_MCES_SCE | ALPHA_MCES_PCE);
/*
* Find out how much memory is available, by looking at
@ -579,9 +588,9 @@ alpha_init(pfn, ptb)
boothowto &= ~RB_SINGLE;
break;
case 'n': /* askname */
case 'N':
boothowto |= RB_ASKNAME;
case 'h': /* always halt, never reboot */
case 'H':
boothowto |= RB_HALT;
break;
#if 0
@ -590,6 +599,11 @@ alpha_init(pfn, ptb)
boothowto |= RB_MINIROOT;
break;
#endif
case 'n': /* askname */
case 'N':
boothowto |= RB_ASKNAME;
break;
}
}
@ -759,6 +773,10 @@ boot(howto)
goto haltsys;
}
/* If "always halt" was specified as a boot flag, obey. */
if ((boothowto & RB_HALT) != 0)
howto |= RB_HALT;
boothowto = howto;
if ((howto & RB_NOSYNC) == 0 && waittime < 0) {
waittime = 0;
@ -1231,6 +1249,18 @@ cpu_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
case CPU_ROOT_DEVICE:
return (sysctl_rdstring(oldp, oldlenp, newp, root_device));
case CPU_UNALIGNED_PRINT:
return (sysctl_int(oldp, oldlenp, newp, newlen,
&alpha_unaligned_print));
case CPU_UNALIGNED_FIX:
return (sysctl_int(oldp, oldlenp, newp, newlen,
&alpha_unaligned_fix));
case CPU_UNALIGNED_SIGBUS:
return (sysctl_int(oldp, oldlenp, newp, newlen,
&alpha_unaligned_sigbus));
default:
return (EOPNOTSUPP);
}