d6610bc2ad
.. use IO port 0cd8-0xcf7 range for CPU present bitmap Signed-off-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
25 lines
900 B
Plaintext
25 lines
900 B
Plaintext
QEMU<->ACPI BIOS CPU hotplug interface
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--------------------------------------
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QEMU supports CPU hotplug via ACPI. This document
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describes the interface between QEMU and the ACPI BIOS.
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ACPI GPE block (IO ports 0xafe0-0xafe3, byte access):
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-----------------------------------------
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Generic ACPI GPE block. Bit 2 (GPE.2) used to notify CPU
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hot-add/remove event to ACPI BIOS, via SCI interrupt.
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CPU present bitmap for:
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ICH9-LPC (IO port 0x0cd8-0xcf7, 1-byte access)
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PIIX-PM (IO port 0xaf00-0xaf1f, 1-byte access)
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---------------------------------------------------------------
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One bit per CPU. Bit position reflects corresponding CPU APIC ID.
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Read-only.
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CPU hot-add/remove notification:
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-----------------------------------------------------
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QEMU sets/clears corresponding CPU bit on hot-add/remove event.
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CPU present map read by ACPI BIOS GPE.2 handler to notify OS of CPU
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hot-(un)plug events.
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