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authorVivek Goyal <vgoyal@in.ibm.com>2006-01-11 16:46:21 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-11 22:05:01 -0500
commitaf5b98042452cc6f50de8afa9d079bda8556d74d (patch)
treebcfbd3e0ed8daae81ddd7098346334aea93e1d94 /arch/x86_64
parent79f12614a6537cc3ac9ca4d1ea26f6e4f4a34aee (diff)
[PATCH] x86_64: ioapic virtual wire mode fix
o Currently, during kexec reboot, IOAPIC is re-programmed back to virtual wire mode if there was an i8259 connected to it. This enables getting timer interrupts in second kernel in legacy mode. o After putting into virtual wire mode, IOAPIC delivers the i8259 interrupts to CPU0. This works well for kexec but not for kdump as we might crash on a different CPU and second kernel will not see timer interrupts. o This patch modifies the redirection table entry to deliver the timer interrupts to the cpu we are rebooting (instead of hardcoding to zero). This ensures that second kernel receives timer interrupts even on a non-boot cpu. Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/kernel/io_apic.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 6c938c60fa3b..fd1e7c36dc23 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -1307,7 +1307,8 @@ void disable_IO_APIC(void)
1307 entry.dest_mode = 0; /* Physical */ 1307 entry.dest_mode = 0; /* Physical */
1308 entry.delivery_mode = dest_ExtINT; /* ExtInt */ 1308 entry.delivery_mode = dest_ExtINT; /* ExtInt */
1309 entry.vector = 0; 1309 entry.vector = 0;
1310 entry.dest.physical.physical_dest = 0; 1310 entry.dest.physical.physical_dest =
1311 GET_APIC_ID(apic_read(APIC_ID));
1311 1312
1312 /* 1313 /*
1313 * Add it to the IO-APIC irq-routing table: 1314 * Add it to the IO-APIC irq-routing table: