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interrupt_controller: program local APIC LDR register for xAPIC

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If IO APIC is in logical destination mode, local APICs compare their
logical APIC ID defined in LDR (Logical Destination Register) with
the destination code sent with the interrupt to determine whether or not
to accept the incoming interrupt.

This patch programs LDR in xAPIC mode to support IO APIC logical mode.

The local APIC ID from local APIC ID register can't be used as the
'logical APIC ID' because LAPIC ID may not be consecutive numbers hence
it makes it impossible for LDR to encode 8 IDs within 8 bits.

This patch chooses 0 for BSP, and for APs, cpu_number which is the index
to x86_cpuboot[], which ultimately assigned in z_smp_init[].

Signed-off-by: Zide Chen <zide.chen@intel.com>
This commit is contained in:
Zide Chen 2020-02-10 14:09:05 -08:00 • committed by Andrew Boie
commit 87b65c5ac2
4 changed files with 25 additions and 3 deletions
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2
include/drivers/interrupt_controller/loapic.h
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@ -54,7 +54,7 @@
extern "C" {
#endif
extern void z_loapic_enable(void);
extern void z_loapic_enable(unsigned char cpu_number);
extern void z_loapic_int_vec_set(unsigned int irq, unsigned int vector);
extern void z_loapic_irq_enable(unsigned int irq);
extern void z_loapic_irq_disable(unsigned int irq);