Use the 32-bit register addresses whenever they are non-zero. This means
that the 32-bit addresses are favored over the 64-bit (GAS) addresses. The
64-bit addresses are only used if the 32-bit addresses are zero. This
change provides compatibility with all versions of Windows. The worst
case that this solves is when both the 32-bit and 64-bit addresses are
non-zero, but only the 32-bit addresses are actually valid. This appears
to happen in some BIOSes because in this case, Windows uses the 32-bit
addresses.
The Linux OS no longer wants to respond true for this string.
The only safe strings are windows-related as they represent
the tested path through the BIOS-provided ASL.
As per the ACPI specification, preserve (read/modify/write) all
bits that are defined as either reserved or ignored (PM control
control registers only.)
Ignored bits must be preserved according to the ACPI spec.
Usually this means a read/modify/write when writing to the register.
However, for status registers, writing a one means clear the event.
Writing a zero means preserve the event (do not clear.) This behavior
is clarified in the ACPI 4.0 spec, and the ACPICA code now simply
always writes a zero to the ignored bit.
Added a reader/writer locking mechanism to allow multiple
concurrent namespace walks (readers), but a dynamic table
unload will have exclusive access to the namespace. This fixes
a problem where a table unload could delete the portion of
the namespace that is currently being examined by a walk.
Adds a new file, utlock.c that implements the reader/writer
lock mechanism. ACPICA BZ 749.
Incorrect register length mismatch between the 32 and 64 bit
registers in some cases. Code was was checking the wrong pointer
for non-zero, should be looking at the address within the GAS
structure.
Fixes problem introduced in 20090220, "Split out PM1 status registers
from the FADT". Must check for the case where the PM1B status reg
does not exist, before the GAS structure is constructed.
Junk-uk Kim.
Fixes a problem where a WalkNamespace user function could have a
namespace node deleted out from under it due to the execution of
an AML Unload operator. A new mutex has been defined to exclude
these two activities. ACPICA BZ 749.
Removed locking for reads from the ACPI bit registers in PM1 Status,
Enable, Control, and PM2 Control. The lock is not required when
reading the single-bit registers. The AcpiGetRegisterUnlocked function
is no longer needed and has been removed. This will improve performance
for reads on these registers.
ACPICA BZ 760.
Remove all instances of this obsolete macro, since it is now a simple
reference to ->common.type. There were about 150 invocations of the
macro across 41 files.
