platform/x86: dell-smbios-wmi: Add new WMI dispatcher driver

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The dell-smbios stack only currently uses an SMI interface which grants
direct access to physical memory to the firmware SMM methods via a pointer.

This dispatcher driver adds a WMI-ACPI interface that is detected by WMI
probe and preferred over the SMI interface in dell-smbios.

Changing this to operate over WMI-ACPI will use an ACPI OperationRegion
for a buffer of data storage when SMM calls are performed.

This is a safer approach to use in kernel drivers as the SMM will
only have access to that OperationRegion.

Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
Reviewed-by: Edward O'Callaghan <quasisec@google.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>

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This commit is contained in:

Mario Limonciello 2017-11-01 14:25:32 -05:00 • committed by Darren Hart (VMware)

parent 549b4930f0

commit 1a258e6704

4 changed files with 257 additions and 0 deletions

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6

MAINTAINERS

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14

drivers/platform/x86/Kconfig

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1

drivers/platform/x86/Makefile

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236

drivers/platform/x86/dell-smbios-wmi.c

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