From: Eric W. Biederman <ebiederm@xmission.com>
Restore the local apic to virtual wire mode on reboot.
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/arch/i386/kernel/apic.c | 30 ++++++++++++++++++++++++++++++
25-akpm/include/asm-i386/apicdef.h | 1 +
2 files changed, 31 insertions(+)
diff -puN arch/i386/kernel/apic.c~kexec-apic-virtwire-on-shutdowni386patch arch/i386/kernel/apic.c
--- 25/arch/i386/kernel/apic.c~kexec-apic-virtwire-on-shutdowni386patch 2004-10-16 01:30:50.055890992 -0700
+++ 25-akpm/arch/i386/kernel/apic.c 2004-10-16 01:30:50.060890232 -0700
@@ -220,6 +220,36 @@ void disconnect_bsp_APIC(void)
outb(0x70, 0x22);
outb(0x00, 0x23);
}
+ else {
+ /* Go back to Virtual Wire compatibility mode */
+ unsigned long value;
+
+ /* For the spurious interrupt use vector F, and enable it */
+ value = apic_read(APIC_SPIV);
+ value &= ~APIC_VECTOR_MASK;
+ value |= APIC_SPIV_APIC_ENABLED;
+ value |= 0xf;
+ apic_write_around(APIC_SPIV, value);
+
+ /* For LVT0 make it edge triggered, active high, external and enabled */
+ value = apic_read(APIC_LVT0);
+ value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
+ APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
+ APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED );
+ value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
+ value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXINT);
+ apic_write_around(APIC_LVT0, value);
+
+ /* For LVT1 make it edge triggered, active high, nmi and enabled */
+ value = apic_read(APIC_LVT1);
+ value &= ~(
+ APIC_MODE_MASK | APIC_SEND_PENDING |
+ APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
+ APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
+ value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
+ value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI);
+ apic_write_around(APIC_LVT1, value);
+ }
}
void disable_local_APIC(void)
diff -puN include/asm-i386/apicdef.h~kexec-apic-virtwire-on-shutdowni386patch include/asm-i386/apicdef.h
--- 25/include/asm-i386/apicdef.h~kexec-apic-virtwire-on-shutdowni386patch 2004-10-16 01:30:50.057890688 -0700
+++ 25-akpm/include/asm-i386/apicdef.h 2004-10-16 01:30:50.061890080 -0700
@@ -86,6 +86,7 @@
#define APIC_LVT_REMOTE_IRR (1<<14)
#define APIC_INPUT_POLARITY (1<<13)
#define APIC_SEND_PENDING (1<<12)
+#define APIC_MODE_MASK 0x700
#define GET_APIC_DELIVERY_MODE(x) (((x)>>8)&0x7)
#define SET_APIC_DELIVERY_MODE(x,y) (((x)&~0x700)|((y)<<8))
#define APIC_MODE_FIXED 0x0
_