patch-2.4.0-test3 linux/drivers/acpi/interpreter/amnames.c
Next file: linux/drivers/acpi/interpreter/amprep.c
Previous file: linux/drivers/acpi/interpreter/ammonad.c
Back to the patch index
Back to the overall index
- Lines: 441
- Date:
Wed Jul 5 11:23:12 2000
- Orig file:
v2.4.0-test2/linux/drivers/acpi/interpreter/amnames.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.0-test2/linux/drivers/acpi/interpreter/amnames.c linux/drivers/acpi/interpreter/amnames.c
@@ -0,0 +1,440 @@
+
+/******************************************************************************
+ *
+ * Module Name: amnames - interpreter/scanner name load/execute
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 R. Byron Moore
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+
+#include "acpi.h"
+#include "interp.h"
+#include "amlcode.h"
+#include "namesp.h"
+
+#define _COMPONENT INTERPRETER
+ MODULE_NAME ("amnames");
+
+
+/* AML Package Length encodings */
+
+#define ACPI_AML_PACKAGE_TYPE1 0x40
+#define ACPI_AML_PACKAGE_TYPE2 0x4000
+#define ACPI_AML_PACKAGE_TYPE3 0x400000
+#define ACPI_AML_PACKAGE_TYPE4 0x40000000
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: Acpi_aml_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.
+ *
+ ******************************************************************************/
+
+char *
+acpi_aml_allocate_name_string (
+ u32 prefix_count,
+ u32 num_name_segs)
+{
+ char *temp_ptr;
+ char *name_string;
+ u32 size_needed;
+
+
+ /*
+ * 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 == (u32) -1) {
+ /* Special case for root */
+
+ size_needed = 1 + (ACPI_NAME_SIZE * num_name_segs) + 2 + 1;
+ }
+ else {
+ size_needed = prefix_count + (ACPI_NAME_SIZE * num_name_segs) + 2 + 1;
+ }
+
+ /*
+ * Allocate a buffer for the name.
+ * This buffer must be deleted by the caller!
+ */
+
+ name_string = acpi_cm_allocate ((ACPI_SIZE) size_needed);
+ if (!name_string) {
+ REPORT_ERROR ("Aml_allocate_name_string: name allocation failure");
+ return (NULL);
+ }
+
+ temp_ptr = name_string;
+
+ /* Set up Root or Parent prefixes if needed */
+
+ if (prefix_count == (u32) -1) {
+ *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_OP;
+ *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_aml_exec_name_segment() will
+ * append the segment(s)
+ */
+
+ *temp_ptr = 0;
+
+ return (name_string);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: Acpi_aml_decode_package_length
+ *
+ * PARAMETERS: Last_pkg_len - latest value decoded by Do_pkg_length() for
+ * most recently examined package or field
+ *
+ * RETURN: Number of bytes contained in package length encoding
+ *
+ * DESCRIPTION: Decodes the Package Length. Upper 2 bits are are used to
+ * tell if type 1, 2, 3, or 4.
+ * 0x3F = Max 1 byte encoding,
+ * 0xFFF = Max 2 byte encoding,
+ * 0xFFFFF = Max 3 Byte encoding,
+ * 0xFFFFFFFFF = Max 4 Byte encoding.
+ *
+ ******************************************************************************/
+
+u32
+acpi_aml_decode_package_length (
+ u32 last_pkg_len)
+{
+ u32 num_bytes = 0;
+
+
+ if (last_pkg_len < ACPI_AML_PACKAGE_TYPE1) {
+ num_bytes = 1;
+ }
+
+ else if (last_pkg_len < ACPI_AML_PACKAGE_TYPE2) {
+ num_bytes = 2;
+ }
+
+ else if (last_pkg_len < ACPI_AML_PACKAGE_TYPE3) {
+ num_bytes = 3;
+ }
+
+ else if (last_pkg_len < ACPI_AML_PACKAGE_TYPE4) {
+ num_bytes = 4;
+ }
+
+ return (num_bytes);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: Acpi_aml_exec_name_segment
+ *
+ * PARAMETERS: Interpreter_mode - Current running mode (load1/Load2/Exec)
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Execute a name segment (4 bytes)
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+acpi_aml_exec_name_segment (
+ u8 **in_aml_address,
+ char *name_string)
+{
+ u8 *aml_address = *in_aml_address;
+ ACPI_STATUS status = AE_OK;
+ s32 index;
+ char char_buf[5];
+
+
+ /*
+ * 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') {
+ return (AE_CTRL_PENDING);
+ }
+
+ for (index = 4;
+ (index > 0) && (acpi_cm_valid_acpi_character (*aml_address));
+ --index)
+ {
+ char_buf[4 - index] = *aml_address++;
+ }
+
+
+ /* Valid name segment */
+
+ if (0 == index) {
+ /* Found 4 valid characters */
+
+ char_buf[4] = '\0';
+
+ if (name_string) {
+ STRCAT (name_string, char_buf);
+ }
+
+ }
+
+ else if (4 == index) {
+ /*
+ * First character was not a valid name character,
+ * so we are looking at something other than a name.
+ */
+ status = AE_CTRL_PENDING;
+ }
+
+ else {
+ /* Segment started with one or more valid characters, but fewer than 4 */
+
+ status = AE_AML_BAD_NAME;
+ }
+
+ *in_aml_address = aml_address;
+
+ return (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: Acpi_aml_get_name_string
+ *
+ * PARAMETERS: Data_type - Data type to be associated with this name
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Get a name, including any prefixes.
+ *
+ ******************************************************************************/
+
+
+ACPI_STATUS
+acpi_aml_get_name_string (
+ OBJECT_TYPE_INTERNAL 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;
+ s32 num_segments;
+ s32 prefix_count = 0;
+ u8 prefix = 0;
+
+
+ if (INTERNAL_TYPE_DEF_FIELD == data_type ||
+ INTERNAL_TYPE_BANK_FIELD == data_type ||
+ INTERNAL_TYPE_INDEX_FIELD == data_type)
+ {
+ /* Disallow prefixes for types associated with field names */
+
+ name_string = acpi_aml_allocate_name_string (0, 1);
+ if (!name_string) {
+ status = AE_NO_MEMORY;
+ }
+ else {
+ status = acpi_aml_exec_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:
+
+ prefix = *aml_address++;
+ /*
+ * Remember that we have a Root_prefix --
+ * see comment in Acpi_aml_allocate_name_string()
+ */
+ prefix_count = -1;
+ break;
+
+
+ case AML_PARENT_PREFIX:
+
+ /* Increment past possibly multiple parent prefixes */
+
+ do
+ {
+ prefix = *aml_address++;
+ ++prefix_count;
+
+ } while (*aml_address == AML_PARENT_PREFIX);
+
+ break;
+
+
+ default:
+
+ break;
+ }
+
+
+ /* Examine first character of name for name segment prefix operator */
+
+ switch (*aml_address)
+ {
+
+ case AML_DUAL_NAME_PREFIX:
+
+ prefix = *aml_address++;
+ name_string = acpi_aml_allocate_name_string (prefix_count, 2);
+ if (!name_string) {
+ status = AE_NO_MEMORY;
+ break;
+ }
+
+ /* Ensure Prefix_count != 0 to remember processing a prefix */
+
+ prefix_count += 2;
+
+ status = acpi_aml_exec_name_segment (&aml_address, name_string);
+ if (ACPI_SUCCESS (status)) {
+ status = acpi_aml_exec_name_segment (&aml_address, name_string);
+ }
+ break;
+
+
+ case AML_MULTI_NAME_PREFIX_OP:
+
+ prefix = *aml_address++;
+ /* Fetch count of segments remaining in name path */
+
+ num_segments = *aml_address++;
+
+ name_string = acpi_aml_allocate_name_string (prefix_count, num_segments);
+ if (!name_string) {
+ status = AE_NO_MEMORY;
+ break;
+ }
+
+ /* Ensure Prefix_count != 0 to remember processing a prefix */
+
+ prefix_count += 2;
+
+ while (num_segments &&
+ (status = acpi_aml_exec_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 */
+
+
+ /* Consume the NULL byte */
+
+ aml_address++;
+ name_string = acpi_aml_allocate_name_string (prefix_count, 0);
+ if (!name_string) {
+ status = AE_NO_MEMORY;
+ break;
+ }
+
+ break;
+
+
+ default:
+
+ /* Name segment string */
+
+ name_string = acpi_aml_allocate_name_string (prefix_count, 1);
+ if (!name_string) {
+ status = AE_NO_MEMORY;
+ break;
+ }
+
+ status = acpi_aml_exec_name_segment (&aml_address, name_string);
+ break;
+
+ } /* Switch (Peek_op ()) */
+ }
+
+
+ if (AE_CTRL_PENDING == status && prefix_count != 0) {
+ /* Ran out of segments after processing a prefix */
+
+ REPORT_ERROR ("Ran out of segments after processing a prefix");
+
+ status = AE_AML_BAD_NAME;
+ }
+
+
+ *out_name_string = name_string;
+ *out_name_length = (u32) (aml_address - in_aml_address);
+
+ return (status);
+}
+
+
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)