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authorBob Moore <robert.moore@intel.com>2017-09-20 10:00:49 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-10-04 01:43:06 +0200
commitc2e56e54b2b426fdce62e1a08a77ce8e6f4b915c (patch)
treec8b06d4e7d3dfdc55c9914c192ec6e8d64900da3
parent72a2935502cc0f23567df649ebc644038d24abcf (diff)
downloadlinux-c2e56e54b2b426fdce62e1a08a77ce8e6f4b915c.tar.gz
ACPICA: String conversions: Update to add new behaviors
ACPICA commit e3574138af82a25d76324559848689946982dbd0 1) Allow whitespace in string before the constant 2) ut_strtoul64 now always creates a 64-bit integer; iASL will truncate this to the lower 32-bits if the table being compiled is a 32-bit table (DSDT revision less than 2). Link: https://github.com/acpica/acpica/commit/e3574138af82 Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/acpi/acpica/acutils.h2
-rw-r--r--drivers/acpi/acpica/utstrsuppt.c25
-rw-r--r--drivers/acpi/acpica/utstrtoul64.c72
3 files changed, 78 insertions, 21 deletions
diff --git a/drivers/acpi/acpica/acutils.h b/drivers/acpi/acpica/acutils.h
index 7a568c6..83b75e9 100644
--- a/drivers/acpi/acpica/acutils.h
+++ b/drivers/acpi/acpica/acutils.h
@@ -211,6 +211,8 @@ acpi_status acpi_ut_convert_decimal_string(char *string, u64 *return_value_ptr);
acpi_status acpi_ut_convert_hex_string(char *string, u64 *return_value_ptr);
+char acpi_ut_remove_whitespace(char **string);
+
char acpi_ut_remove_leading_zeros(char **string);
u8 acpi_ut_detect_hex_prefix(char **string);
diff --git a/drivers/acpi/acpica/utstrsuppt.c b/drivers/acpi/acpica/utstrsuppt.c
index 2526ba3..965fb5c 100644
--- a/drivers/acpi/acpica/utstrsuppt.c
+++ b/drivers/acpi/acpica/utstrsuppt.c
@@ -231,6 +231,31 @@ char acpi_ut_remove_leading_zeros(char **string)
/*******************************************************************************
*
+ * FUNCTION: acpi_ut_remove_whitespace
+ *
+ * PARAMETERS: string - Pointer to input ASCII string
+ *
+ * RETURN: Next character after any whitespace. This character may be
+ * used by the caller to detect end-of-string.
+ *
+ * DESCRIPTION: Remove any leading whitespace in the input string. Return the
+ * next character after the final ASCII zero to enable the caller
+ * to check for the end of the string (NULL terminator).
+ *
+ ******************************************************************************/
+
+char acpi_ut_remove_whitespace(char **string)
+{
+
+ while (isspace((u8)**string)) {
+ *string += 1;
+ }
+
+ return (**string);
+}
+
+/*******************************************************************************
+ *
* FUNCTION: acpi_ut_detect_hex_prefix
*
* PARAMETERS: string - Pointer to input ASCII string
diff --git a/drivers/acpi/acpica/utstrtoul64.c b/drivers/acpi/acpica/utstrtoul64.c
index 67a39d9..e2067dc 100644
--- a/drivers/acpi/acpica/utstrtoul64.c
+++ b/drivers/acpi/acpica/utstrtoul64.c
@@ -66,22 +66,25 @@ ACPI_MODULE_NAME("utstrtoul64")
* iASL - Main parser, conversion of constants to integers
* iASL - Data Table Compiler parser (constants and math expressions)
* interpreter - Implicit and explicit conversions, GPE method names
+ * interpreter - Repair code for return values from predefined names
* debugger - Command line input string conversion
- * acpi_dump - Input table addresses
- * acpi_exec - Testing of the acpi_ut_strtoul64 function
+ * acpi_dump - ACPI table physical addresses
+ * acpi_exec - Support for namespace overrides
*
* Notes concerning users of these interfaces:
*
- * acpi_gbl_integer_byte_width is used to set the 32/64 bit limit. This global
- * must be set to the proper width. For the core ACPICA code, the width
- * depends on the DSDT version. For iASL, the default width is 64 bits for
- * all parsers, but error checking is performed later to flag cases where
- * a 64-bit constant is wrongly defined in a 32-bit DSDT/SSDT.
+ * acpi_gbl_integer_byte_width is used to set the 32/64 bit limit for explicit
+ * and implicit conversions. This global must be set to the proper width.
+ * For the core ACPICA code, the width depends on the DSDT version. For the
+ * acpi_ut_strtoul64 interface, all conversions are 64 bits. This interface is
+ * used primarily for iASL, where the default width is 64 bits for all parsers,
+ * but error checking is performed later to flag cases where a 64-bit constant
+ * is wrongly defined in a 32-bit DSDT/SSDT.
*
- * In ACPI, the only place where octal numbers are supported is within
- * the ASL language itself. This is implemented via the main acpi_ut_strtoul64
- * interface. According the ACPI specification, there is no ACPI runtime
- * support for octal string conversions.
+ * In ACPI, the only place where octal numbers are supported is within
+ * the ASL language itself. This is implemented via the main acpi_ut_strtoul64
+ * interface. According the ACPI specification, there is no ACPI runtime
+ * support (explicit/implicit) for octal string conversions.
*
******************************************************************************/
/*******************************************************************************
@@ -93,11 +96,11 @@ ACPI_MODULE_NAME("utstrtoul64")
* return_value - Where the converted integer is
* returned. Must be a valid pointer
*
- * RETURN: Status and converted integer
- * Returns an exception on numeric overflow
+ * RETURN: Status and converted integer. Returns an exception on a
+ * 64-bit numeric overflow
*
- * DESCRIPTION: Convert a string into an unsigned integer. Performs either a
- * 32-bit or 64-bit conversion, depending on the current global
+ * DESCRIPTION: Convert a string into an unsigned integer. Always performs a
+ * full 64-bit conversion, regardless of the current global
* integer width. Supports Decimal, Hex, and Octal strings.
*
* Current users of this function:
@@ -105,11 +108,15 @@ ACPI_MODULE_NAME("utstrtoul64")
* iASL - Preprocessor (constants and math expressions)
* iASL - Main ASL parser, conversion of ASL constants to integers
* iASL - Data Table Compiler parser (constants and math expressions)
+ * interpreter - Repair code for return values from predefined names
+ * acpi_dump - ACPI table physical addresses
+ * acpi_exec - Support for namespace overrides
*
******************************************************************************/
acpi_status acpi_ut_strtoul64(char *string, u64 *return_value)
{
acpi_status status = AE_OK;
+ u8 original_bit_width;
u32 base = 10; /* Default is decimal */
ACPI_FUNCTION_TRACE_STR(ut_strtoul64, string);
@@ -122,6 +129,10 @@ acpi_status acpi_ut_strtoul64(char *string, u64 *return_value)
return_ACPI_STATUS(AE_OK);
}
+ if (!acpi_ut_remove_whitespace(&string)) {
+ return_ACPI_STATUS(AE_OK);
+ }
+
/*
* 1) Check for a hex constant. A "0x" prefix indicates base 16.
*/
@@ -142,8 +153,16 @@ acpi_status acpi_ut_strtoul64(char *string, u64 *return_value)
}
/*
- * Perform the base 8, 10, or 16 conversion. A numeric overflow will
- * return an exception (to allow iASL to flag the statement).
+ * Force a full 64-bit conversion. The caller (usually iASL) must
+ * check for a 32-bit overflow later as necessary (If current mode
+ * is 32-bit, meaning a 32-bit DSDT).
+ */
+ original_bit_width = acpi_gbl_integer_bit_width;
+ acpi_gbl_integer_bit_width = 64;
+
+ /*
+ * Perform the base 8, 10, or 16 conversion. A 64-bit numeric overflow
+ * will return an exception (to allow iASL to flag the statement).
*/
switch (base) {
case 8:
@@ -160,6 +179,9 @@ acpi_status acpi_ut_strtoul64(char *string, u64 *return_value)
break;
}
+ /* Only possible exception from above is a 64-bit overflow */
+
+ acpi_gbl_integer_bit_width = original_bit_width;
return_ACPI_STATUS(status);
}
@@ -223,6 +245,10 @@ u64 acpi_ut_implicit_strtoul64(char *string)
ACPI_FUNCTION_TRACE_STR(ut_implicit_strtoul64, string);
+ if (!acpi_ut_remove_whitespace(&string)) {
+ return_VALUE(0);
+ }
+
/*
* Per the ACPI specification, only hexadecimal is supported for
* implicit conversions, and the "0x" prefix is "not allowed".
@@ -236,8 +262,8 @@ u64 acpi_ut_implicit_strtoul64(char *string)
/*
* Ignore overflow as per the ACPI specification. This is implemented by
- * ignoring the return status below. On overflow, the input string is
- * simply truncated.
+ * ignoring the return status from the conversion function called below.
+ * On overflow, the input string is simply truncated.
*/
acpi_ut_convert_hex_string(string, &converted_integer);
return_VALUE(converted_integer);
@@ -301,6 +327,10 @@ u64 acpi_ut_explicit_strtoul64(char *string)
ACPI_FUNCTION_TRACE_STR(ut_explicit_strtoul64, string);
+ if (!acpi_ut_remove_whitespace(&string)) {
+ return_VALUE(0);
+ }
+
/*
* Only Hex and Decimal are supported, as per the ACPI specification.
* A "0x" prefix indicates hex; otherwise decimal is assumed.
@@ -315,8 +345,8 @@ u64 acpi_ut_explicit_strtoul64(char *string)
/*
* Ignore overflow as per the ACPI specification. This is implemented by
- * ignoring the return status below. On overflow, the input string is
- * simply truncated.
+ * ignoring the return status from the conversion functions called below.
+ * On overflow, the input string is simply truncated.
*/
switch (base) {
case 10: