// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
*
* Module Name: utresrc - Resource management utilities
*
******************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acresrc.h"
#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME("utresrc")
/*
* Base sizes of the raw AML resource descriptors, indexed by resource type.
* Zero indicates a reserved (and therefore invalid) resource type.
*/
const u8 acpi_gbl_resource_aml_sizes[] = {
/* Small descriptors */
0,
0,
0,
0,
ACPI_AML_SIZE_SMALL(struct aml_resource_irq),
ACPI_AML_SIZE_SMALL(struct aml_resource_dma),
ACPI_AML_SIZE_SMALL(struct aml_resource_start_dependent),
ACPI_AML_SIZE_SMALL(struct aml_resource_end_dependent),
ACPI_AML_SIZE_SMALL(struct aml_resource_io),
ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_io),
ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_dma),
0,
0,
0,
ACPI_AML_SIZE_SMALL(struct aml_resource_vendor_small),
ACPI_AML_SIZE_SMALL(struct aml_resource_end_tag),
/* Large descriptors */
0,
ACPI_AML_SIZE_LARGE(struct aml_resource_memory24),
ACPI_AML_SIZE_LARGE(struct aml_resource_generic_register),
0,
ACPI_AML_SIZE_LARGE(struct aml_resource_vendor_large),
ACPI_AML_SIZE_LARGE(struct aml_resource_memory32),
ACPI_AML_SIZE_LARGE(struct aml_resource_fixed_memory32),
ACPI_AML_SIZE_LARGE(struct aml_resource_address32),
ACPI_AML_SIZE_LARGE(struct aml_resource_address16),
ACPI_AML_SIZE_LARGE(struct aml_resource_extended_irq),
ACPI_AML_SIZE_LARGE(struct aml_resource_address64),
ACPI_AML_SIZE_LARGE(struct aml_resource_extended_address64),
ACPI_AML_SIZE_LARGE(struct aml_resource_gpio),
ACPI_AML_SIZE_LARGE(struct aml_resource_pin_function),
ACPI_AML_SIZE_LARGE(struct aml_resource_common_serialbus),
ACPI_AML_SIZE_LARGE(struct aml_resource_pin_config),
ACPI_AML_SIZE_LARGE(struct aml_resource_pin_group),
ACPI_AML_SIZE_LARGE(struct aml_resource_pin_group_function),
ACPI_AML_SIZE_LARGE(struct aml_resource_pin_group_config),
ACPI_AML_SIZE_LARGE(struct aml_resource_clock_input),
};
const u8 acpi_gbl_resource_aml_serial_bus_sizes[] = {
0,
ACPI_AML_SIZE_LARGE(struct aml_resource_i2c_serialbus),
ACPI_AML_SIZE_LARGE(struct aml_resource_spi_serialbus),
ACPI_AML_SIZE_LARGE(struct aml_resource_uart_serialbus),
ACPI_AML_SIZE_LARGE(struct aml_resource_csi2_serialbus),
};
/*
* Resource types, used to validate the resource length field.
* The length of fixed-length types must match exactly, variable
* lengths must meet the minimum required length, etc.
* Zero indicates a reserved (and therefore invalid) resource type.
*/
static const u8 acpi_gbl_resource_types[] = {
/* Small descriptors */
0,
0,
0,
0,
ACPI_SMALL_VARIABLE_LENGTH, /* 04 IRQ */
ACPI_FIXED_LENGTH, /* 05 DMA */
ACPI_SMALL_VARIABLE_LENGTH, /* 06 start_dependent_functions */
ACPI_FIXED_LENGTH, /* 07 end_dependent_functions */
ACPI_FIXED_LENGTH, /* 08 IO */
ACPI_FIXED_LENGTH, /* 09 fixed_IO */
ACPI_FIXED_LENGTH, /* 0A fixed_DMA */
0,
0,
0,
ACPI_VARIABLE_LENGTH, /* 0E vendor_short */
ACPI_FIXED_LENGTH, /* 0F end_tag */
/* Large descriptors */
0,
ACPI_FIXED_LENGTH, /* 01 Memory24 */
ACPI_FIXED_LENGTH, /* 02 generic_register */
0,
ACPI_VARIABLE_LENGTH, /* 04 vendor_long */
ACPI_FIXED_LENGTH, /* 05 Memory32 */
ACPI_FIXED_LENGTH, /* 06 memory32_fixed */
ACPI_VARIABLE_LENGTH, /* 07 Dword* address */
ACPI_VARIABLE_LENGTH, /* 08 Word* address */
ACPI_VARIABLE_LENGTH, /* 09 extended_IRQ */
ACPI_VARIABLE_LENGTH, /* 0A Qword* address */
ACPI_FIXED_LENGTH, /* 0B Extended* address */
ACPI_VARIABLE_LENGTH, /* 0C Gpio* */
ACPI_VARIABLE_LENGTH, /* 0D pin_function */
ACPI_VARIABLE_LENGTH, /* 0E *serial_bus */
ACPI_VARIABLE_LENGTH, /* 0F pin_config */
ACPI_VARIABLE_LENGTH, /* 10 pin_group */
ACPI_VARIABLE_LENGTH, /* 11 pin_group_function */
ACPI_VARIABLE_LENGTH, /* 12 pin_group_config */
ACPI_VARIABLE_LENGTH, /* 13 clock_input */
};
/*******************************************************************************
*
* FUNCTION: acpi_ut_walk_aml_resources
*
* PARAMETERS: walk_state - Current walk info
* PARAMETERS: aml - Pointer to the raw AML resource template
* aml_length - Length of the entire template
* user_function - Called once for each descriptor found. If
* NULL, a pointer to the end_tag is returned
* context - Passed to user_function
*
* RETURN: Status
*
* DESCRIPTION: Walk a raw AML resource list(buffer). User function called
* once for each resource found.
*
******************************************************************************/
acpi_status
acpi_ut_walk_aml_resources(struct acpi_walk_state *walk_state,
u8 *aml,
acpi_size aml_length,
acpi_walk_aml_callback user_function, void **context)
{
acpi_status status;
u8 *end_aml;
u8 resource_index;
u32 length;
u32 offset = 0;
u8 end_tag[2] = { 0x79, 0x00 };
ACPI_FUNCTION_TRACE(ut_walk_aml_resources);
/* The absolute minimum resource template is one end_tag descriptor */
if (aml_length < sizeof(struct aml_resource_end_tag)) {
return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
}
/* Point to the end of the resource template buffer */
end_aml = aml + aml_length;
/* Walk the byte list, abort on any invalid descriptor type or length */
while (aml < end_aml) {
/* Validate the Resource Type and Resource Length */
status =
acpi_ut_validate_resource(walk_state, aml, &resource_index);
if (ACPI_FAILURE(status)) {
/*
* Exit on failure. Cannot continue because the descriptor
* length may be bogus also.
*/
return_ACPI_STATUS(status);
}
/* Get the length of this descriptor */
length = acpi_ut_get_descriptor_length(aml);
/* Invoke the user function */
if (user_function) {
status =
user_function(aml, length, offset, resource_index,
context);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/* An end_tag descriptor terminates this resource template */
if (acpi_ut_get_resource_type(aml) ==
ACPI_RESOURCE_NAME_END_TAG) {
/*
* There must be at least one more byte in the buffer for
* the 2nd byte of the end_tag
*/
if ((aml + 1) >= end_aml) {
return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
}
/*
* Don't attempt to perform any validation on the 2nd byte.
* Although all known ASL compilers insert a zero for the 2nd
* byte, it can also be a checksum (as per the ACPI spec),
* and this is occasionally seen in the field. July 2017.
*/
/* Return the pointer to the end_tag if requested */
if (!user_function) {
*context = aml;
}
/* Normal exit */
return_ACPI_STATUS(AE_OK);
}
aml += length;
offset += length;
}
/* Did not find an end_tag descriptor */
if (user_function) {
/* Insert an end_tag anyway. acpi_rs_get_list_length always leaves room */
(void)acpi_ut_validate_resource(walk_state, end_tag,
&resource_index);
status =
user_function(end_tag, 2, offset, resource_index, context);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_validate_resource
*
* PARAMETERS: walk_state - Current walk info
* aml - Pointer to the raw AML resource descriptor
* return_index - Where the resource index is returned. NULL
* if the index is not required.
*
* RETURN: Status, and optionally the Index into the global resource tables
*
* DESCRIPTION: Validate an AML resource descriptor by checking the Resource
* Type and Resource Length. Returns an index into the global
* resource information/dispatch tables for later use.
*
******************************************************************************/
acpi_status
acpi_ut_validate_resource(struct acpi_walk_state *walk_state,
void *aml, u8 *return_index)
{
union aml_resource *aml_resource;
u8 resource_type;
u8 resource_index;
acpi_rs_length resource_length;
acpi_rs_length minimum_resource_length;
ACPI_FUNCTION_ENTRY();
/*
* 1) Validate the resource_type field (Byte 0)
*/
resource_type = ACPI_GET8(aml);
/*
* Byte 0 contains the descriptor name (Resource Type)
* Examine the large/small bit in the resource header
*/
if (resource_type & ACPI_RESOURCE_NAME_LARGE) {
/* Verify the large resource type (name) against the max */
if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) {
goto invalid_resource;
}
/*
* Large Resource Type -- bits 6:0 contain the name
* Translate range 0x80-0x8B to index range 0x10-0x1B
*/
resource_index = (u8) (resource_type - 0x70);
} else {
/*
* Small Resource Type -- bits 6:3 contain the name
* Shift range to index range 0x00-0x0F
*/
resource_index = (u8)
((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
}
/*
* Check validity of the resource type, via acpi_gbl_resource_types.
* Zero indicates an invalid resource.
*/
if (!acpi_gbl_resource_types[resource_index]) {
goto invalid_resource;
}
/*
* Validate the resource_length field. This ensures that the length
* is at least reasonable, and guarantees that it is non-zero.
*/
resource_length = acpi_ut_get_resource_length(aml);
minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index];
/* Validate based upon the type of resource - fixed length or variable */
switch (acpi_gbl_resource_types[resource_index]) {
case ACPI_FIXED_LENGTH:
/* Fixed length resource, length must match exactly */
if (resource_length != minimum_resource_length) {
goto bad_resource_length;
}
break;
case ACPI_VARIABLE_LENGTH:
/* Variable length resource, length must be at least the minimum */
if (resource_length < minimum_resource_length) {
goto bad_resource_length;
}
break;
case ACPI_SMALL_VARIABLE_LENGTH:
/* Small variable length resource, length can be (Min) or (Min-1) */
if ((resource_length > minimum_resource_length) ||
(resource_length < (minimum_resource_length - 1))) {
goto bad_resource_length;
}
break;
default:
/* Shouldn't happen (because of validation earlier), but be sure */
goto invalid_resource;
}
aml_resource = ACPI_CAST_PTR(union aml_resource, aml);
if (resource_type == ACPI_RESOURCE_NAME_SERIAL_BUS) {
/* Avoid undefined behavior: member access within misaligned address */
struct aml_resource_common_serialbus common_serial_bus;
memcpy(&common_serial_bus, aml_resource,
sizeof(common_serial_bus));
/* Validate the bus_type field */
if ((common_serial_bus.type == 0) ||
(common_serial_bus.type > AML_RESOURCE_MAX_SERIALBUSTYPE)) {
if (walk_state) {
ACPI_ERROR((AE_INFO,
"Invalid/unsupported SerialBus resource descriptor: BusType 0x%2.2X",
common_serial_bus.type));
}
return (AE_AML_INVALID_RESOURCE_TYPE);
}
}
/* Optionally return the resource table index */
if (return_index) {
*return_index = resource_index;
}
return (AE_OK);
invalid_resource:
if (walk_state) {
ACPI_ERROR((AE_INFO,
"Invalid/unsupported resource descriptor: Type 0x%2.2X",
resource_type));
}
return (AE_AML_INVALID_RESOURCE_TYPE);
bad_resource_length:
if (walk_state) {
ACPI_ERROR((AE_INFO,
"Invalid resource descriptor length: Type "
"0x%2.2X, Length 0x%4.4X, MinLength 0x%4.4X",
resource_type, resource_length,
minimum_resource_length));
}
return (AE_AML_BAD_RESOURCE_LENGTH);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_get_resource_type
*
* PARAMETERS: aml - Pointer to the raw AML resource descriptor
*
* RETURN: The Resource Type with no extraneous bits (except the
* Large/Small descriptor bit -- this is left alone)
*
* DESCRIPTION: Extract the Resource Type/Name from the first byte of
* a resource descriptor.
*
******************************************************************************/
u8 acpi_ut_get_resource_type(void *aml)
{
ACPI_FUNCTION_ENTRY();
/*
* Byte 0 contains the descriptor name (Resource Type)
* Examine the large/small bit in the resource header
*/
if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
/* Large Resource Type -- bits 6:0 contain the name */
return (ACPI_GET8(aml));
} else {
/* Small Resource Type -- bits 6:3 contain the name */
return ((u8) (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_get_resource_length
*
* PARAMETERS: aml - Pointer to the raw AML resource descriptor
*
* RETURN: Byte Length
*
* DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
* definition, this does not include the size of the descriptor
* header or the length field itself.
*
******************************************************************************/
u16 acpi_ut_get_resource_length(void *aml)
{
acpi_rs_length resource_length;
ACPI_FUNCTION_ENTRY();
/*
* Byte 0 contains the descriptor name (Resource Type)
* Examine the large/small bit in the resource header
*/
if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
/* Large Resource type -- bytes 1-2 contain the 16-bit length */
ACPI_MOVE_16_TO_16(&resource_length, ACPI_ADD_PTR(u8, aml, 1));
} else {
/* Small Resource type -- bits 2:0 of byte 0 contain the length */
resource_length = (u16) (ACPI_GET8(aml) &
ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
}
return (resource_length);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_get_resource_header_length
*
* PARAMETERS: aml - Pointer to the raw AML resource descriptor
*
* RETURN: Length of the AML header (depends on large/small descriptor)
*
* DESCRIPTION: Get the length of the header for this resource.
*
******************************************************************************/
u8 acpi_ut_get_resource_header_length(void *aml)
{
ACPI_FUNCTION_ENTRY();
/* Examine the large/small bit in the resource header */
if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
return (sizeof(struct aml_resource_large_header));
} else {
return (sizeof(struct aml_resource_small_header));
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_get_descriptor_length
*
* PARAMETERS: aml - Pointer to the raw AML resource descriptor
*
* RETURN: Byte length
*
* DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
* length of the descriptor header and the length field itself.
* Used to walk descriptor lists.
*
******************************************************************************/
u32 acpi_ut_get_descriptor_length(void *aml)
{
ACPI_FUNCTION_ENTRY();
/*
* Get the Resource Length (does not include header length) and add
* the header length (depends on if this is a small or large resource)
*/
return (acpi_ut_get_resource_length(aml) +
acpi_ut_get_resource_header_length(aml));
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_get_resource_end_tag
*
* PARAMETERS: obj_desc - The resource template buffer object
* end_tag - Where the pointer to the end_tag is returned
*
* RETURN: Status, pointer to the end tag
*
* DESCRIPTION: Find the end_tag resource descriptor in an AML resource template
* Note: allows a buffer length of zero.
*
******************************************************************************/
acpi_status
acpi_ut_get_resource_end_tag(union acpi_operand_object *obj_desc, u8 **end_tag)
{
acpi_status status;
ACPI_FUNCTION_TRACE(ut_get_resource_end_tag);
/* Allow a buffer length of zero */
if (!obj_desc->buffer.length) {
*end_tag = obj_desc->buffer.pointer;
return_ACPI_STATUS(AE_OK);
}
/* Validate the template and get a pointer to the end_tag */
status = acpi_ut_walk_aml_resources(NULL, obj_desc->buffer.pointer,
obj_desc->buffer.length, NULL,
(void **)end_tag);
return_ACPI_STATUS(status);
}
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