acpi_status status = AE_OK;
union acpi_operand_object *rgn_desc;
- ACPI_FUNCTION_TRACE_U32("ex_setup_region", field_datum_byte_offset);
+ ACPI_FUNCTION_TRACE_U32(ex_setup_region, field_datum_byte_offset);
rgn_desc = obj_desc->common_field.region_obj;
}
}
+ /* Exit if Address/Length have been disallowed by the host OS */
+
+ if (rgn_desc->common.flags & AOPOBJ_INVALID) {
+ return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
+ }
+
+ /*
+ * Exit now for SMBus address space, it has a non-linear address space
+ * and the request cannot be directly validated
+ */
if (rgn_desc->region.space_id == ACPI_ADR_SPACE_SMBUS) {
+
/* SMBus has a non-linear address space */
return_ACPI_STATUS(AE_OK);
* length of one field datum (access width) must fit within the region.
* (Region length is specified in bytes)
*/
- if (rgn_desc->region.length < (obj_desc->common_field.base_byte_offset +
- field_datum_byte_offset +
- obj_desc->common_field.
- access_byte_width)) {
+ if (rgn_desc->region.length <
+ (obj_desc->common_field.base_byte_offset +
+ field_datum_byte_offset +
+ obj_desc->common_field.access_byte_width)) {
if (acpi_gbl_enable_interpreter_slack) {
/*
* Slack mode only: We will go ahead and allow access to this
union acpi_operand_object *rgn_desc;
acpi_physical_address address;
- ACPI_FUNCTION_TRACE("ex_access_region");
+ ACPI_FUNCTION_TRACE(ex_access_region);
/*
* Ensure that the region operands are fully evaluated and verify
}
ACPI_DEBUG_PRINT_RAW((ACPI_DB_BFIELD,
- " Region [%s:%X], Width %X, byte_base %X, Offset %X at %8.8X%8.8X\n",
+ " Region [%s:%X], Width %X, ByteBase %X, Offset %X at %8.8X%8.8X\n",
acpi_ut_get_region_name(rgn_desc->region.
space_id),
rgn_desc->region.space_id,
acpi_status status;
acpi_integer local_value;
- ACPI_FUNCTION_TRACE_U32("ex_field_datum_io", field_datum_byte_offset);
+ ACPI_FUNCTION_TRACE_U32(ex_field_datum_io, field_datum_byte_offset);
if (read_write == ACPI_READ) {
if (!value) {
}
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
- "I/O to Data Register: value_ptr %p\n",
+ "I/O to Data Register: ValuePtr %p\n",
value));
if (read_write == ACPI_READ) {
+
/* Read the datum from the data_register */
status =
acpi_integer merged_value;
acpi_integer current_value;
- ACPI_FUNCTION_TRACE_U32("ex_write_with_update_rule", mask);
+ ACPI_FUNCTION_TRACE_U32(ex_write_with_update_rule, mask);
/* Start with the new bits */
/* If the mask is all ones, we don't need to worry about the update rule */
if (mask != ACPI_INTEGER_MAX) {
+
/* Decode the update rule */
switch (obj_desc->common_field.
default:
ACPI_ERROR((AE_INFO,
- "Unknown update_rule value: %X",
+ "Unknown UpdateRule value: %X",
(obj_desc->common_field.
field_flags &
AML_FIELD_UPDATE_RULE_MASK)));
}
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
- "Mask %8.8X%8.8X, datum_offset %X, Width %X, Value %8.8X%8.8X, merged_value %8.8X%8.8X\n",
+ "Mask %8.8X%8.8X, DatumOffset %X, Width %X, Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n",
ACPI_FORMAT_UINT64(mask),
field_datum_byte_offset,
obj_desc->common_field.access_byte_width,
u32 field_datum_count;
u32 i;
- ACPI_FUNCTION_TRACE("ex_extract_from_field");
+ ACPI_FUNCTION_TRACE(ex_extract_from_field);
/* Validate target buffer and clear it */
/* Read the rest of the field */
for (i = 1; i < field_datum_count; i++) {
+
/* Get next input datum from the field */
field_offset += obj_desc->common_field.access_byte_width;
return_ACPI_STATUS(status);
}
- /* Merge with previous datum if necessary */
-
- merged_datum |= raw_datum <<
- (obj_desc->common_field.access_bit_width -
- obj_desc->common_field.start_field_bit_offset);
+ /*
+ * Merge with previous datum if necessary.
+ *
+ * Note: Before the shift, check if the shift value will be larger than
+ * the integer size. If so, there is no need to perform the operation.
+ * This avoids the differences in behavior between different compilers
+ * concerning shift values larger than the target data width.
+ */
+ if ((obj_desc->common_field.access_bit_width -
+ obj_desc->common_field.start_field_bit_offset) <
+ ACPI_INTEGER_BIT_SIZE) {
+ merged_datum |=
+ raw_datum << (obj_desc->common_field.
+ access_bit_width -
+ obj_desc->common_field.
+ start_field_bit_offset);
+ }
if (i == datum_count) {
break;
{
acpi_status status;
acpi_integer mask;
+ acpi_integer width_mask;
acpi_integer merged_datum;
acpi_integer raw_datum = 0;
u32 field_offset = 0;
u32 field_datum_count;
u32 i;
- ACPI_FUNCTION_TRACE("ex_insert_into_field");
+ ACPI_FUNCTION_TRACE(ex_insert_into_field);
/* Validate input buffer */
return_ACPI_STATUS(AE_BUFFER_OVERFLOW);
}
- /* Compute the number of datums (access width data items) */
+ /*
+ * Create the bitmasks used for bit insertion.
+ * Note: This if/else is used to bypass compiler differences with the
+ * shift operator
+ */
+ if (obj_desc->common_field.access_bit_width == ACPI_INTEGER_BIT_SIZE) {
+ width_mask = ACPI_INTEGER_MAX;
+ } else {
+ width_mask =
+ ACPI_MASK_BITS_ABOVE(obj_desc->common_field.
+ access_bit_width);
+ }
- mask =
+ mask = width_mask &
ACPI_MASK_BITS_BELOW(obj_desc->common_field.start_field_bit_offset);
- datum_count =
- ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length,
- obj_desc->common_field.access_bit_width);
- field_datum_count =
- ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length +
- obj_desc->common_field.start_field_bit_offset,
- obj_desc->common_field.access_bit_width);
+
+ /* Compute the number of datums (access width data items) */
+
+ datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length,
+ obj_desc->common_field.access_bit_width);
+
+ field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length +
+ obj_desc->common_field.
+ start_field_bit_offset,
+ obj_desc->common_field.
+ access_bit_width);
/* Get initial Datum from the input buffer */
/* Write the entire field */
for (i = 1; i < field_datum_count; i++) {
+
/* Write merged datum to the target field */
merged_datum &= mask;
return_ACPI_STATUS(status);
}
- /* Start new output datum by merging with previous input datum */
-
field_offset += obj_desc->common_field.access_byte_width;
- merged_datum = raw_datum >>
- (obj_desc->common_field.access_bit_width -
- obj_desc->common_field.start_field_bit_offset);
- mask = ACPI_INTEGER_MAX;
+
+ /*
+ * Start new output datum by merging with previous input datum
+ * if necessary.
+ *
+ * Note: Before the shift, check if the shift value will be larger than
+ * the integer size. If so, there is no need to perform the operation.
+ * This avoids the differences in behavior between different compilers
+ * concerning shift values larger than the target data width.
+ */
+ if ((obj_desc->common_field.access_bit_width -
+ obj_desc->common_field.start_field_bit_offset) <
+ ACPI_INTEGER_BIT_SIZE) {
+ merged_datum =
+ raw_datum >> (obj_desc->common_field.
+ access_bit_width -
+ obj_desc->common_field.
+ start_field_bit_offset);
+ } else {
+ merged_datum = 0;
+ }
+
+ mask = width_mask;
if (i == datum_count) {
break;
git://git.onelab.eu / linux-2.6.git / blobdiff