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[Core Change] Fix PIC interrupt delivery by unmasking LINT0 in APIC for BSP

This commit is contained in:
Matt Borgerson 2018-06-26 14:08:38 -07:00
parent 6338bfae98
commit 410702189f
1 changed files with 21 additions and 0 deletions
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21
hw/intc/apic_common.c
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@ -257,6 +257,27 @@ static void apic_reset_common(DeviceState *dev)
info->vapic_base_update(s); info->vapic_base_update(s);
apic_init_reset(dev); apic_init_reset(dev);
#ifdef XBOX
/* XBOX
* The following code was removed in b8eb551 stating:
*
* Due to old Seabios bug, QEMU reenable LINT0 after reset. This bug
* is long gone and therefore this hack is no longer needed. Since it
* violates the specifications, it is removed.
*
* However, Xbox kernels will *not* unmask LINT0, causing PIC interrupt
* delivery failure. So bring this code back for Xbox compat.
*/
if (bsp) {
/*
* LINT0 delivery mode on CPU #0 is set to ExtInt at initialization
* time typically by BIOS, so PIC interrupt can be delivered to the
* processor when local APIC is enabled.
*/
s->lvt[APIC_LVT_LINT0] = 0x700;
}
#endif
} }
/* This function is only used for old state version 1 and 2 */ /* This function is only used for old state version 1 and 2 */