diff options
Diffstat (limited to 'arch/x86_64/kernel/io_apic.c')
| -rw-r--r-- | arch/x86_64/kernel/io_apic.c | 36 |
1 files changed, 34 insertions, 2 deletions
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c index afd87e64d0a8..157190d986bb 100644 --- a/arch/x86_64/kernel/io_apic.c +++ b/arch/x86_64/kernel/io_apic.c @@ -330,7 +330,7 @@ static int find_irq_entry(int apic, int pin, int type) /* * Find the pin to which IRQ[irq] (ISA) is connected */ -static int __init find_isa_irq_pin(int irq, int type) +static int find_isa_irq_pin(int irq, int type) { int i; @@ -1132,12 +1132,44 @@ static void __init enable_IO_APIC(void) */ void disable_IO_APIC(void) { + int pin; /* * Clear the IO-APIC before rebooting: */ clear_IO_APIC(); - disconnect_bsp_APIC(); + /* + * If the i82559 is routed through an IOAPIC + * Put that IOAPIC in virtual wire mode + * so legacy interrups can be delivered. + */ + pin = find_isa_irq_pin(0, mp_ExtINT); + if (pin != -1) { + struct IO_APIC_route_entry entry; + unsigned long flags; + + memset(&entry, 0, sizeof(entry)); + entry.mask = 0; /* Enabled */ + entry.trigger = 0; /* Edge */ + entry.irr = 0; + entry.polarity = 0; /* High */ + entry.delivery_status = 0; + entry.dest_mode = 0; /* Physical */ + entry.delivery_mode = 7; /* ExtInt */ + entry.vector = 0; + entry.dest.physical.physical_dest = 0; + + + /* + * Add it to the IO-APIC irq-routing table: + */ + spin_lock_irqsave(&ioapic_lock, flags); + io_apic_write(0, 0x11+2*pin, *(((int *)&entry)+1)); + io_apic_write(0, 0x10+2*pin, *(((int *)&entry)+0)); + spin_unlock_irqrestore(&ioapic_lock, flags); + } + + disconnect_bsp_APIC(pin != -1); } /* |