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ACPICA: Add a mechanism to escape infinite AML While() loops

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Add a loop counter to force exit from AML While loops if the
count becomes too large. This can occur in poorly written AML
when the hardware does not respond within a while loop and the
loop does not implement a timeout. The maximum loop count is
configurable. A new exception code is returned when a loop is
broken, AE_AML_INFINITE_LOOP.  Bob Moore, Alexey Starikovskiy.

Signed-off-by: Bob Moore <[email protected]>
Signed-off-by: Lin Ming <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Bob Moore 2008-11-12 15:15:29 +08:00 • committed by Len Brown
commit fc37445733
4 changed files with 29 additions and 4 deletions
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4
include/acpi/acconfig.h
View file

@ -119,6 +119,10 @@
#define ACPI_ROOT_TABLE_SIZE_INCREMENT 4
/* Maximum number of While() loop iterations before forced abort */
#define ACPI_MAX_LOOP_ITERATIONS 0xFFFF
/******************************************************************************
*
* ACPI Specification constants (Do not change unless the specification changes)

4
include/acpi/acexcep.h
View file

@ -153,8 +153,9 @@
#define AE_AML_CIRCULAR_REFERENCE (acpi_status) (0x001E | AE_CODE_AML)
#define AE_AML_BAD_RESOURCE_LENGTH (acpi_status) (0x001F | AE_CODE_AML)
#define AE_AML_ILLEGAL_ADDRESS (acpi_status) (0x0020 | AE_CODE_AML)
#define AE_AML_INFINITE_LOOP (acpi_status) (0x0021 | AE_CODE_AML)
#define AE_CODE_AML_MAX 0x0020
#define AE_CODE_AML_MAX 0x0021
/*
* Internal exceptions used for control
@ -267,6 +268,7 @@ char const *acpi_gbl_exception_names_aml[] = {
"AE_AML_CIRCULAR_REFERENCE",
"AE_AML_BAD_RESOURCE_LENGTH",
"AE_AML_ILLEGAL_ADDRESS",
"AE_AML_INFINITE_LOOP"
};
char const *acpi_gbl_exception_names_ctrl[] = {

1
include/acpi/aclocal.h
View file

@ -566,6 +566,7 @@ struct acpi_control_state {
union acpi_parse_object *predicate_op;
u8 *aml_predicate_start; /* Start of if/while predicate */
u8 *package_end; /* End of if/while block */
u32 loop_count; /* While() loop counter */
};
/*