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clear_ioapic: Fix reading of number of interrupts for IO-APICs 

Apply the same fix for `setup_ioapic` as done in the following commit.

commit 23c046b6f1 Author: Nico Huber <nico.huber@secunet.com> Date: Mon Sep 24 10:48:43 2012 +0200

	Fix reading of number of interrupts for IO-APICs

	The number read from the io-apic register represents the index of the
	highest interrupt redirection entry, i.e. the number of interrupts
	minus one.

	Change-Id: I54c992e4ff400de24bb9fef5d82251078f92c588
	Signed-off-by: Nico Huber <nico.huber@secunet.com>
	Reviewed-on: http://review.coreboot.org/1624
	Tested-by: build bot (Jenkins)
	Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

Change-Id: I7b730d016a514c95c3b32aee6f31bd3d7b2c08cb
Signed-off-by: Aladyshev Konstantin <aladyshev@nicevt.ru>
Reviewed-on: http://review.coreboot.org/2043
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
This commit is contained in:
Aladyshev Konstantin 2012-12-18 22:29:20 +04:00 committed by Patrick Georgi
parent d5c998be99
commit be0e92568f
1 changed files with 5 additions and 2 deletions
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7
src/arch/x86/lib/ioapic.c
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@ -43,8 +43,11 @@ void clear_ioapic(u32 ioapic_base)
/* Read the available number of interrupts. */
ioapic_interrupts = (io_apic_read(ioapic_base, 0x01) >> 16) & 0xff;
if (!ioapic_interrupts || ioapic_interrupts == 0xff)
ioapic_interrupts = 24;
if (ioapic_interrupts == 0xff)
ioapic_interrupts = 23;
ioapic_interrupts += 1; /* Bits 23-16 specify the maximum redirection
entry, which is the number of interrupts
minus 1. */
printk(BIOS_DEBUG, "IOAPIC: %d interrupts\n", ioapic_interrupts);
low = DISABLED;