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/drivers/acpi/acpica/psutils.c

http://github.com/mirrors/linux
C | 214 lines | 93 code | 40 blank | 81 comment | 23 complexity | 0203d7a0e8d09569c2f981a80c632e61 MD5 | raw file
  1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
  2/******************************************************************************
  3 *
  4 * Module Name: psutils - Parser miscellaneous utilities (Parser only)
  5 *
  6 * Copyright (C) 2000 - 2020, Intel Corp.
  7 *
  8 *****************************************************************************/
  9
 10#include <acpi/acpi.h>
 11#include "accommon.h"
 12#include "acparser.h"
 13#include "amlcode.h"
 14#include "acconvert.h"
 15
 16#define _COMPONENT          ACPI_PARSER
 17ACPI_MODULE_NAME("psutils")
 18
 19/*******************************************************************************
 20 *
 21 * FUNCTION:    acpi_ps_create_scope_op
 22 *
 23 * PARAMETERS:  None
 24 *
 25 * RETURN:      A new Scope object, null on failure
 26 *
 27 * DESCRIPTION: Create a Scope and associated namepath op with the root name
 28 *
 29 ******************************************************************************/
 30union acpi_parse_object *acpi_ps_create_scope_op(u8 *aml)
 31{
 32	union acpi_parse_object *scope_op;
 33
 34	scope_op = acpi_ps_alloc_op(AML_SCOPE_OP, aml);
 35	if (!scope_op) {
 36		return (NULL);
 37	}
 38
 39	scope_op->named.name = ACPI_ROOT_NAME;
 40	return (scope_op);
 41}
 42
 43/*******************************************************************************
 44 *
 45 * FUNCTION:    acpi_ps_init_op
 46 *
 47 * PARAMETERS:  op              - A newly allocated Op object
 48 *              opcode          - Opcode to store in the Op
 49 *
 50 * RETURN:      None
 51 *
 52 * DESCRIPTION: Initialize a parse (Op) object
 53 *
 54 ******************************************************************************/
 55
 56void acpi_ps_init_op(union acpi_parse_object *op, u16 opcode)
 57{
 58	ACPI_FUNCTION_ENTRY();
 59
 60	op->common.descriptor_type = ACPI_DESC_TYPE_PARSER;
 61	op->common.aml_opcode = opcode;
 62
 63	ACPI_DISASM_ONLY_MEMBERS(acpi_ut_safe_strncpy(op->common.aml_op_name,
 64						      (acpi_ps_get_opcode_info
 65						       (opcode))->name,
 66						      sizeof(op->common.
 67							     aml_op_name)));
 68}
 69
 70/*******************************************************************************
 71 *
 72 * FUNCTION:    acpi_ps_alloc_op
 73 *
 74 * PARAMETERS:  opcode          - Opcode that will be stored in the new Op
 75 *              aml             - Address of the opcode
 76 *
 77 * RETURN:      Pointer to the new Op, null on failure
 78 *
 79 * DESCRIPTION: Allocate an acpi_op, choose op type (and thus size) based on
 80 *              opcode. A cache of opcodes is available for the pure
 81 *              GENERIC_OP, since this is by far the most commonly used.
 82 *
 83 ******************************************************************************/
 84
 85union acpi_parse_object *acpi_ps_alloc_op(u16 opcode, u8 *aml)
 86{
 87	union acpi_parse_object *op;
 88	const struct acpi_opcode_info *op_info;
 89	u8 flags = ACPI_PARSEOP_GENERIC;
 90
 91	ACPI_FUNCTION_ENTRY();
 92
 93	op_info = acpi_ps_get_opcode_info(opcode);
 94
 95	/* Determine type of parse_op required */
 96
 97	if (op_info->flags & AML_DEFER) {
 98		flags = ACPI_PARSEOP_DEFERRED;
 99	} else if (op_info->flags & AML_NAMED) {
100		flags = ACPI_PARSEOP_NAMED_OBJECT;
101	} else if (opcode == AML_INT_BYTELIST_OP) {
102		flags = ACPI_PARSEOP_BYTELIST;
103	}
104
105	/* Allocate the minimum required size object */
106
107	if (flags == ACPI_PARSEOP_GENERIC) {
108
109		/* The generic op (default) is by far the most common (16 to 1) */
110
111		op = acpi_os_acquire_object(acpi_gbl_ps_node_cache);
112	} else {
113		/* Extended parseop */
114
115		op = acpi_os_acquire_object(acpi_gbl_ps_node_ext_cache);
116	}
117
118	/* Initialize the Op */
119
120	if (op) {
121		acpi_ps_init_op(op, opcode);
122		op->common.aml = aml;
123		op->common.flags = flags;
124		ASL_CV_CLEAR_OP_COMMENTS(op);
125
126		if (opcode == AML_SCOPE_OP) {
127			acpi_gbl_current_scope = op;
128		}
129
130		if (acpi_gbl_capture_comments) {
131			ASL_CV_TRANSFER_COMMENTS(op);
132		}
133	}
134
135	return (op);
136}
137
138/*******************************************************************************
139 *
140 * FUNCTION:    acpi_ps_free_op
141 *
142 * PARAMETERS:  op              - Op to be freed
143 *
144 * RETURN:      None.
145 *
146 * DESCRIPTION: Free an Op object. Either put it on the GENERIC_OP cache list
147 *              or actually free it.
148 *
149 ******************************************************************************/
150
151void acpi_ps_free_op(union acpi_parse_object *op)
152{
153	ACPI_FUNCTION_NAME(ps_free_op);
154
155	ASL_CV_CLEAR_OP_COMMENTS(op);
156	if (op->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
157		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
158				  "Free retval op: %p\n", op));
159	}
160
161	if (op->common.flags & ACPI_PARSEOP_GENERIC) {
162		(void)acpi_os_release_object(acpi_gbl_ps_node_cache, op);
163	} else {
164		(void)acpi_os_release_object(acpi_gbl_ps_node_ext_cache, op);
165	}
166}
167
168/*******************************************************************************
169 *
170 * FUNCTION:    Utility functions
171 *
172 * DESCRIPTION: Low level character and object functions
173 *
174 ******************************************************************************/
175
176/*
177 * Is "c" a namestring lead character?
178 */
179u8 acpi_ps_is_leading_char(u32 c)
180{
181	return ((u8) (c == '_' || (c >= 'A' && c <= 'Z')));
182}
183
184/*
185 * Get op's name (4-byte name segment) or 0 if unnamed
186 */
187u32 acpi_ps_get_name(union acpi_parse_object * op)
188{
189
190	/* The "generic" object has no name associated with it */
191
192	if (op->common.flags & ACPI_PARSEOP_GENERIC) {
193		return (0);
194	}
195
196	/* Only the "Extended" parse objects have a name */
197
198	return (op->named.name);
199}
200
201/*
202 * Set op's name
203 */
204void acpi_ps_set_name(union acpi_parse_object *op, u32 name)
205{
206
207	/* The "generic" object has no name associated with it */
208
209	if (op->common.flags & ACPI_PARSEOP_GENERIC) {
210		return;
211	}
212
213	op->named.name = name;
214}