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Subject[PATCH][2.4.0t8] bluesmoke

This is forwardport of Alan's 2.2.17/18 Machine Check Architecture
support for PII/PIII. It's based on 2.2.18p6. Works ok on mine Mendocino.

--
Bartlomiej Zolnierkiewicz
<bkz@linux-ide.org>
--- linux-2.4.0-test8/arch/i386/kernel/Makefile Sat Aug 26 00:01:34 2000
+++ linux/arch/i386/kernel/Makefile Thu Sep 14 20:17:09 2000
@@ -18,7 +18,7 @@

obj-y := process.o semaphore.o signal.o entry.o traps.o irq.o vm86.o \
ptrace.o i8259.o ioport.o ldt.o setup.o time.o sys_i386.o \
- pci-dma.o i386_ksyms.o i387.o
+ pci-dma.o i386_ksyms.o i387.o bluesmoke.o


ifdef CONFIG_PCI
--- linux-2.4.0-test8/arch/i386/kernel/bluesmoke.c Thu Sep 14 20:27:41 2000
+++ linux/arch/i386/kernel/bluesmoke.c Thu Sep 14 20:13:11 2000
@@ -0,0 +1,110 @@
+/*
+ * Machine Check Handler For PII/PIII
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <asm/processor.h>
+#include <asm/msr.h>
+
+static int banks = 0;
+
+void mcheck_fault(void)
+{
+ int recover=1;
+ u32 alow, ahigh, high, low;
+ u32 mcgstl, mcgsth;
+ int i;
+
+ rdmsr(0x17a, mcgstl, mcgsth);
+ if(mcgstl&(1<<0)) /* Recoverable ? */
+ recover=0;
+
+ printk(KERN_EMERG "CPU %d: Machine Check Exception: %08x%08x\n", smp_processor_id(), mcgsth, mcgstl);
+
+ for(i=0;i<banks;i++)
+ {
+ rdmsr(0x401+i*4,low, high);
+ if(high&(1<<31))
+ {
+ if(high&(1<<29))
+ recover|=1;
+ if(high&(1<<25))
+ recover|=2;
+ printk(KERN_EMERG "Bank %d: %08x%08x", i, high, low);
+ high&=~(1<<31);
+ if(high&(1<<27))
+ {
+ rdmsr(0x402+i*4, alow, ahigh);
+ printk("[%08x%08x]", alow, ahigh);
+ }
+ if(high&(1<<26))
+ {
+ rdmsr(0x402+i*4, alow, ahigh);
+ printk(" at %08x%08x",
+ high, low);
+ }
+ /* Clear it */
+ wrmsr(0x401+i*4, 0UL, 0UL);
+ /* Serialize */
+ wmb();
+ }
+ }
+
+ if(recover&2)
+ panic("CPU context corrupt");
+ if(recover&1)
+ panic("Unable to continue");
+ printk(KERN_EMERG "Attempting to continue.\n");
+ mcgstl&=~(1<<2);
+ wrmsr(0x17a,mcgstl, mcgsth);
+}
+
+
+/*
+ * This has to be run for each processor
+ */
+
+void mcheck_init(void)
+{
+ u32 l, h;
+ int i;
+ struct cpuinfo_x86 *c;
+ static int done=0;
+
+ c=cpu_data+smp_processor_id();
+
+ if(c->x86_vendor!=X86_VENDOR_INTEL)
+ return;
+
+ if(!(c->x86_capability&X86_FEATURE_MCE))
+ return;
+
+ if(!(c->x86_capability&X86_FEATURE_MCA))
+ return;
+
+ /* Ok machine check is available */
+
+ if(done==0)
+ printk(KERN_INFO "Intel machine check architecture supported.\n");
+ rdmsr(0x179, l, h);
+ if(l&(1<<8))
+ wrmsr(0x17b, 0xffffffff, 0xffffffff);
+ banks = l&0xff;
+ for(i=1;i<banks;i++)
+ {
+ wrmsr(0x400+4*i, 0xffffffff, 0xffffffff);
+ }
+ for(i=0;i<banks;i++)
+ {
+ wrmsr(0x401+4*i, 0x0, 0x0);
+ }
+ __asm__ __volatile__ (
+ "movl %%cr4, %%eax\n\t"
+ "orl $0x40, %%eax\n\t"
+ "movl %%eax, %%cr4\n\t" : : : "eax");
+ printk(KERN_INFO "Intel machine check reporting enabled on CPU#%d.\n", smp_processor_id());
+ done=1;
+}
--- linux-2.4.0-test8/arch/i386/kernel/entry.S Sat Aug 26 00:09:04 2000
+++ linux/arch/i386/kernel/entry.S Thu Sep 14 20:21:17 2000
@@ -414,6 +414,11 @@
pushl $ SYMBOL_NAME(do_page_fault)
jmp error_code

+ENTRY(machine_check)
+ pushl $0
+ pushl $ SYMBOL_NAME(mcheck_fault)
+ jmp error_code
+
ENTRY(spurious_interrupt_bug)
pushl $0
pushl $ SYMBOL_NAME(do_spurious_interrupt_bug)
--- linux-2.4.0-test8/arch/i386/kernel/setup.c Sun Sep 10 12:54:35 2000
+++ linux/arch/i386/kernel/setup.c Thu Sep 14 20:26:09 2000
@@ -1439,6 +1439,7 @@
{
int i=0;
char *p = NULL;
+ extern void mcheck_init(void);

c->loops_per_sec = loops_per_sec;
c->x86_cache_size = -1;
@@ -1475,9 +1476,10 @@
return;

case X86_VENDOR_INTEL:
-
+
squash_the_stupid_serial_number(c);
-
+ mcheck_init();
+
if (c->cpuid_level > 1) {
/* supports eax=2 call */
int edx, dummy;
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