While working with the IO-APIC problem I've been having on the ES-7000,
I noticed something that confuses me about the IO-APIC table entry
structure. If you look in include/asm-x86_64/io_apic.h, it lists the
destination field as a union declared like this:
union { struct { __u32
__reserved_1 : 24,
physical_dest : 4,
__reserved_2 : 4;
} physical;
struct { __u32
__reserved_1 : 24,
logical_dest : 8;
} logical;
} dest;
So, when calling print_IO_APIC(), I would have thought that there would
be overlap in the Log and Phy fields if there's data in the logical_dest
field. For instance, my IO-APIC prints out
.... IRQ redirection table:
NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:
00 020 00 0 0 0 0 0 0 7 00
^^^ ^^
Since there's an 0x020 in the logical_dest field, shouldn't the Phy
field be printing out as 0x02, rather than 0x00? Is there a byte
ordering issue here maybe?
-- Ben
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