diff options
| author | Bob Moore <robert.moore@intel.com> | 2006-02-17 00:00:00 -0500 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2006-04-01 01:23:23 -0500 |
| commit | ea936b78f46cbe089a4ac363e1682dee7d427096 (patch) | |
| tree | c444b65c3d02b05934497caefcdcbbe675a00bdf /drivers/acpi/executer | |
| parent | 52fc0b026e99b5d5d585095148d997d5634bbc25 (diff) | |
| download | linux-ea936b78f46cbe089a4ac363e1682dee7d427096.tar.gz | |
ACPI: ACPICA 20060217
Implemented a change to the IndexField support to match the behavior of the Microsoft AML interpreter. The value written to the Index register is now a byte offset, no longer an index based upon the width of the Data register. This should fix IndexField problems seen on some machines where the Data register is not exactly one byte wide. The ACPI specification will be clarified on this point. Fixed a problem where several resource descriptor types could overrun the internal descriptor buffer due to size miscalculation: VendorShort, VendorLong, and Interrupt. This was noticed on IA64 machines, but could affect all platforms. Fixed a problem where individual resource descriptors were misaligned within the internal buffer, causing alignment faults on IA64 platforms. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/executer')
| -rw-r--r-- | drivers/acpi/executer/exprep.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/acpi/executer/exprep.c b/drivers/acpi/executer/exprep.c index 7719ae5d4f16..916234bf811c 100644 --- a/drivers/acpi/executer/exprep.c +++ b/drivers/acpi/executer/exprep.c @@ -519,13 +519,20 @@ acpi_status acpi_ex_prep_field_value(struct acpi_create_field_info *info) acpi_ut_add_reference(obj_desc->index_field.index_obj); /* + * February 2006: Changed to match MS behavior + * * The value written to the Index register is the byte offset of the - * target field - * Note: may change code to: ACPI_DIV_8 (Info->field_bit_position) + * target field. + * + * Previously, the value was calculated as an index in terms of the + * width of the Data register, as below: + * + * obj_desc->index_field.Value = (u32) + * (Info->field_bit_position / ACPI_MUL_8 ( + * obj_desc->Field.access_byte_width)); */ - obj_desc->index_field.value = (u32) - (info->field_bit_position / - ACPI_MUL_8(obj_desc->field.access_byte_width)); + obj_desc->index_field.value = + (u32) ACPI_DIV_8(info->field_bit_position); ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, "index_field: bit_off %X, Off %X, Value %X, Gran %X, Index %p, Data %p\n", |