[PATCH] kexec: x86: resture apic virtual wire mode on shutdown
When coming out of apic mode attempt to set the appropriate apic back into virtual wire mode. This improves on previous versions of this patch by by never setting bot the local apic and the ioapic into veritual wire mode. This code looks at data from the mptable to see if an ioapic has an ExtInt input to make this decision. A future improvement is to figure out which apic or ioapic was in virtual wire mode at boot time and to remember it. That is potentially a more accurate method, of selecting which apic to place in virutal wire mode. Signed-off-by: Eric Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -211,7 +211,7 @@ void __init connect_bsp_APIC(void)
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enable_apic_mode();
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}
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void disconnect_bsp_APIC(void)
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void disconnect_bsp_APIC(int virt_wire_setup)
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{
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if (pic_mode) {
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/*
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@ -225,6 +225,42 @@ void disconnect_bsp_APIC(void)
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outb(0x70, 0x22);
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outb(0x00, 0x23);
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}
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else {
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/* Go back to Virtual Wire compatibility mode */
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unsigned long value;
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/* For the spurious interrupt use vector F, and enable it */
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value = apic_read(APIC_SPIV);
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value &= ~APIC_VECTOR_MASK;
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value |= APIC_SPIV_APIC_ENABLED;
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value |= 0xf;
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apic_write_around(APIC_SPIV, value);
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if (!virt_wire_setup) {
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/* For LVT0 make it edge triggered, active high, external and enabled */
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value = apic_read(APIC_LVT0);
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value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
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APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
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APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED );
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value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
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value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT);
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apic_write_around(APIC_LVT0, value);
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}
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else {
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/* Disable LVT0 */
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apic_write_around(APIC_LVT0, APIC_LVT_MASKED);
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}
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/* For LVT1 make it edge triggered, active high, nmi and enabled */
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value = apic_read(APIC_LVT1);
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value &= ~(
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APIC_MODE_MASK | APIC_SEND_PENDING |
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APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
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APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
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value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
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value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI);
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apic_write_around(APIC_LVT1, value);
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}
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}
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void disable_local_APIC(void)
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@ -1636,12 +1636,43 @@ static void __init enable_IO_APIC(void)
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*/
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void disable_IO_APIC(void)
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{
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int pin;
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/*
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* Clear the IO-APIC before rebooting:
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*/
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clear_IO_APIC();
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disconnect_bsp_APIC();
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/*
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* If the i82559 is routed through an IOAPIC
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* Put that IOAPIC in virtual wire mode
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* so legacy interrups can be delivered.
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*/
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pin = find_isa_irq_pin(0, mp_ExtINT);
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if (pin != -1) {
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struct IO_APIC_route_entry entry;
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unsigned long flags;
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memset(&entry, 0, sizeof(entry));
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entry.mask = 0; /* Enabled */
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entry.trigger = 0; /* Edge */
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entry.irr = 0;
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entry.polarity = 0; /* High */
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entry.delivery_status = 0;
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entry.dest_mode = 0; /* Physical */
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entry.delivery_mode = 7; /* ExtInt */
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entry.vector = 0;
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entry.dest.physical.physical_dest = 0;
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/*
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* Add it to the IO-APIC irq-routing table:
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*/
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spin_lock_irqsave(&ioapic_lock, flags);
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io_apic_write(0, 0x11+2*pin, *(((int *)&entry)+1));
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io_apic_write(0, 0x10+2*pin, *(((int *)&entry)+0));
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spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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disconnect_bsp_APIC(pin != -1);
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}
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/*
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@ -100,7 +100,7 @@ extern void (*wait_timer_tick)(void);
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extern int get_maxlvt(void);
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extern void clear_local_APIC(void);
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extern void connect_bsp_APIC (void);
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extern void disconnect_bsp_APIC (void);
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extern void disconnect_bsp_APIC (int virt_wire_setup);
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extern void disable_local_APIC (void);
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extern void lapic_shutdown (void);
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extern int verify_local_APIC (void);
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@ -86,6 +86,7 @@
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#define APIC_LVT_REMOTE_IRR (1<<14)
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#define APIC_INPUT_POLARITY (1<<13)
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#define APIC_SEND_PENDING (1<<12)
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#define APIC_MODE_MASK 0x700
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#define GET_APIC_DELIVERY_MODE(x) (((x)>>8)&0x7)
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#define SET_APIC_DELIVERY_MODE(x,y) (((x)&~0x700)|((y)<<8))
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#define APIC_MODE_FIXED 0x0
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