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authorMyron Stowe <mstowe@redhat.com>2012-01-21 03:13:24 +0100
committerLen Brown <len.brown@intel.com>2012-01-21 07:08:17 +0100
commite615bf5b5519862ab66172f4dec7455d6543a578 (patch)
treec6d37861dc376b55bc5c4ece88f57faf9d51e99a /mm
parentLinux 3.3-rc1 (diff)
downloadlinux-e615bf5b5519862ab66172f4dec7455d6543a578.tar.xz
linux-e615bf5b5519862ab66172f4dec7455d6543a578.zip
ACPI, APEI: Add 64-bit read/write support for APEI on i386
Base ACPI (CA) currently does not support atomic 64-bit reads and writes (acpi_read() and acpi_write() split 64-bit loads/stores into two 32-bit transfers) yet APEI expects 64-bit transfer capability, even when running on 32-bit systems. This patch implements 64-bit read and write routines for APEI usage. This patch re-factors similar functionality introduced in commit 04c25997c97, bringing it into the ACPI subsystem in preparation for removing ./drivers/acpi/atomicio.[ch]. In the implementation I have replicated acpi_os_read_memory() and acpi_os_write_memory(), creating 64-bit versions for APEI to utilize, as opposed to something more elegant. My thinking is that we should attempt to see if we can get ACPI's CA/OSL changed so that the existing acpi_read() and acpi_write() interfaces are natively 64-bit capable and then subsequently remove the replication. Signed-off-by: Myron Stowe <myron.stowe@redhat.com> Signed-off-by: Len Brown <len.brown@intel.com>
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