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author | Bob Moore <robert.moore@intel.com> | 2011-11-16 14:51:01 +0800 |
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committer | Len Brown <len.brown@intel.com> | 2012-01-17 03:36:31 -0500 |
commit | 0e243178047c0219b3367dd44f81040826b7ea83 (patch) | |
tree | dcf5bbcbfae157a072a94ced21e949fd7de7ba90 /drivers/acpi/acpica/rscreate.c | |
parent | a91cdde20a870bd773d605c764ed211539bf3020 (diff) | |
download | linux-0e243178047c0219b3367dd44f81040826b7ea83.tar.bz2 |
ACPI 5.0: New interface, acpi_buffer_to_resource
This interface converts an AML buffer to an internal ACPI_RESOURCE.
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/rscreate.c')
-rw-r--r-- | drivers/acpi/acpica/rscreate.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/rscreate.c b/drivers/acpi/acpica/rscreate.c index f61285d5edc3..06264e8b58d9 100644 --- a/drivers/acpi/acpica/rscreate.c +++ b/drivers/acpi/acpica/rscreate.c @@ -51,6 +51,70 @@ ACPI_MODULE_NAME("rscreate") /******************************************************************************* * + * FUNCTION: acpi_buffer_to_resource + * + * PARAMETERS: aml_buffer - Pointer to the resource byte stream + * aml_buffer_length - Length of the aml_buffer + * resource_ptr - Where the converted resource is returned + * + * RETURN: Status + * + * DESCRIPTION: Convert a raw AML buffer to a resource list + * + ******************************************************************************/ +acpi_status +acpi_buffer_to_resource(u8 *aml_buffer, + u16 aml_buffer_length, + struct acpi_resource **resource_ptr) +{ + acpi_status status; + acpi_size list_size_needed; + void *resource; + void *current_resource_ptr; + + /* + * Note: we allow AE_AML_NO_RESOURCE_END_TAG, since an end tag + * is not required here. + */ + + /* Get the required length for the converted resource */ + + status = acpi_rs_get_list_length(aml_buffer, aml_buffer_length, + &list_size_needed); + if (status == AE_AML_NO_RESOURCE_END_TAG) { + status = AE_OK; + } + if (ACPI_FAILURE(status)) { + return (status); + } + + /* Allocate a buffer for the converted resource */ + + resource = ACPI_ALLOCATE_ZEROED(list_size_needed); + current_resource_ptr = resource; + if (!resource) { + return (AE_NO_MEMORY); + } + + /* Perform the AML-to-Resource conversion */ + + status = acpi_ut_walk_aml_resources(aml_buffer, aml_buffer_length, + acpi_rs_convert_aml_to_resources, + ¤t_resource_ptr); + if (status == AE_AML_NO_RESOURCE_END_TAG) { + status = AE_OK; + } + if (ACPI_FAILURE(status)) { + ACPI_FREE(resource); + } else { + *resource_ptr = resource; + } + + return (status); +} + +/******************************************************************************* + * * FUNCTION: acpi_rs_create_resource_list * * PARAMETERS: aml_buffer - Pointer to the resource byte stream |