mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
398 lines
9.5 KiB
398 lines
9.5 KiB
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
|
/****************************************************************************** |
|
* |
|
* Module Name: exnames - interpreter/scanner name load/execute |
|
* |
|
* Copyright (C) 2000 - 2021, Intel Corp. |
|
* |
|
*****************************************************************************/ |
|
|
|
#include <acpi/acpi.h> |
|
#include "accommon.h" |
|
#include "acinterp.h" |
|
#include "amlcode.h" |
|
|
|
#define _COMPONENT ACPI_EXECUTER |
|
ACPI_MODULE_NAME("exnames") |
|
|
|
/* Local prototypes */ |
|
static char *acpi_ex_allocate_name_string(u32 prefix_count, u32 num_name_segs); |
|
|
|
static acpi_status acpi_ex_name_segment(u8 **in_aml_address, char *name_string); |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_ex_allocate_name_string |
|
* |
|
* PARAMETERS: prefix_count - Count of parent levels. Special cases: |
|
* (-1)==root, 0==none |
|
* num_name_segs - count of 4-character name segments |
|
* |
|
* RETURN: A pointer to the allocated string segment. This segment must |
|
* be deleted by the caller. |
|
* |
|
* DESCRIPTION: Allocate a buffer for a name string. Ensure allocated name |
|
* string is long enough, and set up prefix if any. |
|
* |
|
******************************************************************************/ |
|
|
|
static char *acpi_ex_allocate_name_string(u32 prefix_count, u32 num_name_segs) |
|
{ |
|
char *temp_ptr; |
|
char *name_string; |
|
u32 size_needed; |
|
|
|
ACPI_FUNCTION_TRACE(ex_allocate_name_string); |
|
|
|
/* |
|
* Allow room for all \ and ^ prefixes, all segments and a multi_name_prefix. |
|
* Also, one byte for the null terminator. |
|
* This may actually be somewhat longer than needed. |
|
*/ |
|
if (prefix_count == ACPI_UINT32_MAX) { |
|
|
|
/* Special case for root */ |
|
|
|
size_needed = 1 + (ACPI_NAMESEG_SIZE * num_name_segs) + 2 + 1; |
|
} else { |
|
size_needed = |
|
prefix_count + (ACPI_NAMESEG_SIZE * num_name_segs) + 2 + 1; |
|
} |
|
|
|
/* |
|
* Allocate a buffer for the name. |
|
* This buffer must be deleted by the caller! |
|
*/ |
|
name_string = ACPI_ALLOCATE(size_needed); |
|
if (!name_string) { |
|
ACPI_ERROR((AE_INFO, |
|
"Could not allocate size %u", size_needed)); |
|
return_PTR(NULL); |
|
} |
|
|
|
temp_ptr = name_string; |
|
|
|
/* Set up Root or Parent prefixes if needed */ |
|
|
|
if (prefix_count == ACPI_UINT32_MAX) { |
|
*temp_ptr++ = AML_ROOT_PREFIX; |
|
} else { |
|
while (prefix_count--) { |
|
*temp_ptr++ = AML_PARENT_PREFIX; |
|
} |
|
} |
|
|
|
/* Set up Dual or Multi prefixes if needed */ |
|
|
|
if (num_name_segs > 2) { |
|
|
|
/* Set up multi prefixes */ |
|
|
|
*temp_ptr++ = AML_MULTI_NAME_PREFIX; |
|
*temp_ptr++ = (char)num_name_segs; |
|
} else if (2 == num_name_segs) { |
|
|
|
/* Set up dual prefixes */ |
|
|
|
*temp_ptr++ = AML_DUAL_NAME_PREFIX; |
|
} |
|
|
|
/* |
|
* Terminate string following prefixes. acpi_ex_name_segment() will |
|
* append the segment(s) |
|
*/ |
|
*temp_ptr = 0; |
|
|
|
return_PTR(name_string); |
|
} |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_ex_name_segment |
|
* |
|
* PARAMETERS: in_aml_address - Pointer to the name in the AML code |
|
* name_string - Where to return the name. The name is appended |
|
* to any existing string to form a namepath |
|
* |
|
* RETURN: Status |
|
* |
|
* DESCRIPTION: Extract an ACPI name (4 bytes) from the AML byte stream |
|
* |
|
******************************************************************************/ |
|
|
|
static acpi_status acpi_ex_name_segment(u8 ** in_aml_address, char *name_string) |
|
{ |
|
char *aml_address = (void *)*in_aml_address; |
|
acpi_status status = AE_OK; |
|
u32 index; |
|
char char_buf[5]; |
|
|
|
ACPI_FUNCTION_TRACE(ex_name_segment); |
|
|
|
/* |
|
* If first character is a digit, then we know that we aren't looking |
|
* at a valid name segment |
|
*/ |
|
char_buf[0] = *aml_address; |
|
|
|
if ('0' <= char_buf[0] && char_buf[0] <= '9') { |
|
ACPI_ERROR((AE_INFO, "Invalid leading digit: %c", char_buf[0])); |
|
return_ACPI_STATUS(AE_CTRL_PENDING); |
|
} |
|
|
|
for (index = 0; |
|
(index < ACPI_NAMESEG_SIZE) |
|
&& (acpi_ut_valid_name_char(*aml_address, 0)); index++) { |
|
char_buf[index] = *aml_address++; |
|
} |
|
|
|
/* Valid name segment */ |
|
|
|
if (index == 4) { |
|
|
|
/* Found 4 valid characters */ |
|
|
|
char_buf[4] = '\0'; |
|
|
|
if (name_string) { |
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
|
"Appending NameSeg %s\n", char_buf)); |
|
strcat(name_string, char_buf); |
|
} else { |
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
|
"No Name string - %s\n", char_buf)); |
|
} |
|
} else if (index == 0) { |
|
/* |
|
* First character was not a valid name character, |
|
* so we are looking at something other than a name. |
|
*/ |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
|
"Leading character is not alpha: %02Xh (not a name)\n", |
|
char_buf[0])); |
|
status = AE_CTRL_PENDING; |
|
} else { |
|
/* |
|
* Segment started with one or more valid characters, but fewer than |
|
* the required 4 |
|
*/ |
|
status = AE_AML_BAD_NAME; |
|
ACPI_ERROR((AE_INFO, |
|
"Bad character 0x%02x in name, at %p", |
|
*aml_address, aml_address)); |
|
} |
|
|
|
*in_aml_address = ACPI_CAST_PTR(u8, aml_address); |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_ex_get_name_string |
|
* |
|
* PARAMETERS: data_type - Object type to be associated with this |
|
* name |
|
* in_aml_address - Pointer to the namestring in the AML code |
|
* out_name_string - Where the namestring is returned |
|
* out_name_length - Length of the returned string |
|
* |
|
* RETURN: Status, namestring and length |
|
* |
|
* DESCRIPTION: Extract a full namepath from the AML byte stream, |
|
* including any prefixes. |
|
* |
|
******************************************************************************/ |
|
|
|
acpi_status |
|
acpi_ex_get_name_string(acpi_object_type data_type, |
|
u8 * in_aml_address, |
|
char **out_name_string, u32 * out_name_length) |
|
{ |
|
acpi_status status = AE_OK; |
|
u8 *aml_address = in_aml_address; |
|
char *name_string = NULL; |
|
u32 num_segments; |
|
u32 prefix_count = 0; |
|
u8 has_prefix = FALSE; |
|
|
|
ACPI_FUNCTION_TRACE_PTR(ex_get_name_string, aml_address); |
|
|
|
if (ACPI_TYPE_LOCAL_REGION_FIELD == data_type || |
|
ACPI_TYPE_LOCAL_BANK_FIELD == data_type || |
|
ACPI_TYPE_LOCAL_INDEX_FIELD == data_type) { |
|
|
|
/* Disallow prefixes for types associated with field_unit names */ |
|
|
|
name_string = acpi_ex_allocate_name_string(0, 1); |
|
if (!name_string) { |
|
status = AE_NO_MEMORY; |
|
} else { |
|
status = |
|
acpi_ex_name_segment(&aml_address, name_string); |
|
} |
|
} else { |
|
/* |
|
* data_type is not a field name. |
|
* Examine first character of name for root or parent prefix operators |
|
*/ |
|
switch (*aml_address) { |
|
case AML_ROOT_PREFIX: |
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_LOAD, |
|
"RootPrefix(\\) at %p\n", |
|
aml_address)); |
|
|
|
/* |
|
* Remember that we have a root_prefix -- |
|
* see comment in acpi_ex_allocate_name_string() |
|
*/ |
|
aml_address++; |
|
prefix_count = ACPI_UINT32_MAX; |
|
has_prefix = TRUE; |
|
break; |
|
|
|
case AML_PARENT_PREFIX: |
|
|
|
/* Increment past possibly multiple parent prefixes */ |
|
|
|
do { |
|
ACPI_DEBUG_PRINT((ACPI_DB_LOAD, |
|
"ParentPrefix (^) at %p\n", |
|
aml_address)); |
|
|
|
aml_address++; |
|
prefix_count++; |
|
|
|
} while (*aml_address == AML_PARENT_PREFIX); |
|
|
|
has_prefix = TRUE; |
|
break; |
|
|
|
default: |
|
|
|
/* Not a prefix character */ |
|
|
|
break; |
|
} |
|
|
|
/* Examine first character of name for name segment prefix operator */ |
|
|
|
switch (*aml_address) { |
|
case AML_DUAL_NAME_PREFIX: |
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_LOAD, |
|
"DualNamePrefix at %p\n", |
|
aml_address)); |
|
|
|
aml_address++; |
|
name_string = |
|
acpi_ex_allocate_name_string(prefix_count, 2); |
|
if (!name_string) { |
|
status = AE_NO_MEMORY; |
|
break; |
|
} |
|
|
|
/* Indicate that we processed a prefix */ |
|
|
|
has_prefix = TRUE; |
|
|
|
status = |
|
acpi_ex_name_segment(&aml_address, name_string); |
|
if (ACPI_SUCCESS(status)) { |
|
status = |
|
acpi_ex_name_segment(&aml_address, |
|
name_string); |
|
} |
|
break; |
|
|
|
case AML_MULTI_NAME_PREFIX: |
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_LOAD, |
|
"MultiNamePrefix at %p\n", |
|
aml_address)); |
|
|
|
/* Fetch count of segments remaining in name path */ |
|
|
|
aml_address++; |
|
num_segments = *aml_address; |
|
|
|
name_string = |
|
acpi_ex_allocate_name_string(prefix_count, |
|
num_segments); |
|
if (!name_string) { |
|
status = AE_NO_MEMORY; |
|
break; |
|
} |
|
|
|
/* Indicate that we processed a prefix */ |
|
|
|
aml_address++; |
|
has_prefix = TRUE; |
|
|
|
while (num_segments && |
|
(status = |
|
acpi_ex_name_segment(&aml_address, |
|
name_string)) == AE_OK) { |
|
num_segments--; |
|
} |
|
|
|
break; |
|
|
|
case 0: |
|
|
|
/* null_name valid as of 8-12-98 ASL/AML Grammar Update */ |
|
|
|
if (prefix_count == ACPI_UINT32_MAX) { |
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
|
"NameSeg is \"\\\" followed by NULL\n")); |
|
} |
|
|
|
/* Consume the NULL byte */ |
|
|
|
aml_address++; |
|
name_string = |
|
acpi_ex_allocate_name_string(prefix_count, 0); |
|
if (!name_string) { |
|
status = AE_NO_MEMORY; |
|
break; |
|
} |
|
|
|
break; |
|
|
|
default: |
|
|
|
/* Name segment string */ |
|
|
|
name_string = |
|
acpi_ex_allocate_name_string(prefix_count, 1); |
|
if (!name_string) { |
|
status = AE_NO_MEMORY; |
|
break; |
|
} |
|
|
|
status = |
|
acpi_ex_name_segment(&aml_address, name_string); |
|
break; |
|
} |
|
} |
|
|
|
if (AE_CTRL_PENDING == status && has_prefix) { |
|
|
|
/* Ran out of segments after processing a prefix */ |
|
|
|
ACPI_ERROR((AE_INFO, "Malformed Name at %p", name_string)); |
|
status = AE_AML_BAD_NAME; |
|
} |
|
|
|
if (ACPI_FAILURE(status)) { |
|
if (name_string) { |
|
ACPI_FREE(name_string); |
|
} |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
*out_name_string = name_string; |
|
*out_name_length = (u32) (aml_address - in_aml_address); |
|
|
|
return_ACPI_STATUS(status); |
|
}
|
|
|