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Increase MAX_APIC_ID safeguard to 0x800

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MAX_APIC_ID must be at least twice MAXCPU.  Increase it to 0x800 so that
it is possible to set MAXCPU to 512 or 1024 in a custom kernel config
file.

Note that increasing this limit does not itself cause any allocations
to be larger; it just allows madt_parse_cpu() to process higher APIC
IDs.

APIC IDs may be sparse and so we can waste memory.  This is independent
of this change, but becomes more of an issue as the maximum APIC ID
grows.  This should be addressed with future work.

Reviewed by:	royger
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D37067
This commit is contained in:
Ed Maste 2022-10-20 09:04:37 -04:00
parent 64c3edc237
commit c8113dad7e
1 changed files with 1 additions and 1 deletions
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2
sys/x86/include/apicvar.h
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@ -77,7 +77,7 @@
#define xAPIC_MAX_APIC_ID 0xfe
#define xAPIC_ID_ALL 0xff
#define MAX_APIC_ID 0x200
#define MAX_APIC_ID 0x800
#define APIC_ID_ALL 0xffffffff
#define IOAPIC_MAX_ID xAPIC_MAX_APIC_ID