x86/acpi: Add functions to setup and access the wakeup mailbox

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Systems that describe hardware using DeviceTree graphs may enumerate and
implement the wakeup mailbox as defined in the ACPI specification but do
not otherwise depend on ACPI. Expose functions to setup and access the
location of the wakeup mailbox from outside ACPI code.

The function acpi_setup_mp_wakeup_mailbox() stores the physical address of
the mailbox and updates the wakeup_secondary_cpu_64() APIC callback.

The function acpi_madt_multiproc_wakeup_mailbox() returns a pointer to the
mailbox.

Acked-by: Rafael J. Wysocki (Intel) <rafael@kernel.org>
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Dexuan Cui <dexuan@kernel.org>

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Ricardo Neri 2026-03-04 15:41:13 -08:00 • committed by Dexuan Cui

parent bdf5eb306c

commit a746607df2

2 changed files with 21 additions and 0 deletions

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10

arch/x86/include/asm/acpi.h

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11

arch/x86/kernel/acpi/madt_wakeup.c

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