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