Chameleon

Chameleon Svn Source Tree

Root/branches/cparm/i386/libsaio/acpi_tools.c

  • Property svn:executable set to *
1/*␊
2 Copyright (c) 2010, Intel Corporation␊
3 All rights reserved.␊
4 ␊
5 Redistribution and use in source and binary forms, with or without␊
6 modification, are permitted provided that the following conditions are met:␊
7 ␊
8 * Redistributions of source code must retain the above copyright notice,␊
9 this list of conditions and the following disclaimer.␊
10 * Redistributions in binary form must reproduce the above copyright notice,␊
11 this list of conditions and the following disclaimer in the documentation␊
12 and/or other materials provided with the distribution.␊
13 * Neither the name of Intel Corporation nor the names of its contributors␊
14 may be used to endorse or promote products derived from this software␊
15 without specific prior written permission.␊
16 ␊
17 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND␊
18 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED␊
19 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE␊
20 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR␊
21 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES␊
22 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;␊
23 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON␊
24 ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT␊
25 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS␊
26 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.␊
27 */␊
28␊
29#include "datatype.h"␊
30#include "intel_acpi.h"␊
31#include "ppm.h"␊
32#include "acpi_tools.h"␊
33␊
34static U32 GetRsdtPointer(void *mem_addr, U32 mem_size, ACPI_TABLES * acpi_tables);␊
35static U32 GetXsdtPointer(ACPI_TABLES * acpi_tables);␊
36static ACPI_TABLE_HEADER *GetTablePtr(ACPI_TABLE_RSDT * rsdt, U32 signature);␊
37static ACPI_TABLE_HEADER *GetTablePtr64(ACPI_TABLE_XSDT * xsdt, U32 signature);␊
38␊
39//-------------------------------------------------------------------------------␊
40//␊
41// Procedure: FindAcpiTables - Collects addresses for RSDP, RSDT, FADT, & DSDT.␊
42//␊
43// Description: Finds the differentiated system description table pointer␊
44// by scanning and checking ACPI tables. This function will␊
45// get and store the following ACPI Table Pointers:␊
46// 1) RSD Pointer in RsdPointer Variable␊
47// 2) RSDT Pointer in RsdtPointer Variable␉␉␉(RSDP->RSDT)␊
48// 3) XSDT Pointer in XsdtPointer Variable␉␉␉(RSDP->XSDT)␊
49// 4) FACP Pointer in FacpPointer Variable␉␉␉(RSDP->RSDT->FACP)␊
50// 5) FACP(64) Pointer in FacpPointer64 Variable␉␉(RSDP->XSDT->FACP)␊
51// 6) DSDT Pointer in DsdtPointer Variable␉␉␉(RSDP->RSDT->FACP->DSDT)␊
52// 7) DSDT(64) Pointer in DsdtPointer64 Variable␉␉(RSDP->XSDT->FACP->XDSDT)␊
53// 8) FACS Pointer in FacsPointer Variable␉␉␉(RSDP->RSDT->FACP->FACS)␊
54// 9) FACS(64) Pointer in FacsPointer64 Variable␉␉(RSDP->XSDT->FACP->XFACS)␊
55// A) MADT Pointer in FacsPointer Variable␉␉␉(RSDP->RSDT->APIC)␊
56// B) MADT(64) Pointer in MadtPointer64 Variable␉␉(RSDP->XSDT->APIC)␊
57//␊
58//-------------------------------------------------------------------------------␊
59U32 FindAcpiTables(ACPI_TABLES * acpi_tables)␊
60{␊
61 U32 success = 0ul;␊
62 ␊
63 // Perform init of ACPI table pointers␊
64 {␊
65 void *null = 0ul;␊
66 acpi_tables->DsdtPointer = null;␊
67 acpi_tables->DsdtPointer64 = null;␊
68 acpi_tables->FacpPointer = null;␊
69 acpi_tables->FacsPointer = null;␊
70 acpi_tables->FacsPointer64 = null;␊
71 acpi_tables->RsdPointer = null;␊
72 acpi_tables->RsdtPointer = null;␊
73 acpi_tables->MadtPointer = null;␊
74␉␉acpi_tables->MadtPointer64 = null;␊
75 acpi_tables->XsdtPointer = null;␊
76 acpi_tables->FacpPointer64 = null;␊
77 }␊
78 ␊
79 // Find the RSDT pointer by scanning EBDA/E000/F000 segments.␊
80 ␊
81 // Init memory address as EBDA and scan 1KB region␊
82 success = GetRsdtPointer((void *)(((U32) * (U16 *) 0x40E) << 4), 0x400, acpi_tables);␊
83 ␊
84 // Init memory address as E000 segment and scan 64KB region␊
85 if (!success)␊
86 success = GetRsdtPointer((void *)0x0E0000, 0x10000, acpi_tables);␊
87 ␊
88 // Init memory address as F000 segment and scan 64KB region␊
89 if (!success)␊
90 success = GetRsdtPointer((void *)0x0F0000, 0x10000, acpi_tables);␊
91␊
92 if (!success)␊
93 return (0ul);␊
94 ␊
95 GetXsdtPointer(acpi_tables);␊
96 ␊
97 // Find FACP table pointer which is one of table pointers in the RDST␊
98 acpi_tables->FacpPointer = (ACPI_TABLE_FADT *)␊
99 GetTablePtr(acpi_tables->RsdtPointer, NAMESEG("FACP"));␊
100 if (acpi_tables->FacpPointer == 0ul)␊
101 return (0ul);␊
102 ␊
103 // Find FACP(64) table pointer which is one of table pointers in the XDST␊
104 acpi_tables->FacpPointer64 = (ACPI_TABLE_FADT *)␊
105 GetTablePtr64(acpi_tables->XsdtPointer, NAMESEG("FACP"));␊
106 ␊
107 // Find the DSDT which is included in the FACP table␊
108 acpi_tables->DsdtPointer = (ACPI_TABLE_DSDT *) acpi_tables->FacpPointer->Dsdt;␊
109 if ((*(U32 *) (acpi_tables->DsdtPointer->Header.Signature) != NAMESEG("DSDT")) ||␊
110 (GetChecksum(acpi_tables->DsdtPointer, acpi_tables->DsdtPointer->Header.Length) != 0))␊
111 return (0ul);␊
112 ␊
113␉{␊
114␉␉// Find the XDSDT which is included in the FACP(64) table␊
115␉␉ACPI_TABLE_DSDT *DsdtPointer64 = (ACPI_TABLE_DSDT *)((U32)acpi_tables->FacpPointer64->XDsdt);␊
116␉␉if ((*(U32*) (DsdtPointer64->Header.Signature) == NAMESEG("DSDT")) &&␊
117␉␉␉(GetChecksum(DsdtPointer64, DsdtPointer64->Header.Length) == 0))␊
118␉␉␉acpi_tables->DsdtPointer64 = (ACPI_TABLE_DSDT *) DsdtPointer64;␊
119␉} ␊
120 ␊
121 // Find the FACS which is included in the FACP table␊
122 acpi_tables->FacsPointer = (ACPI_TABLE_FACS *) acpi_tables->FacpPointer->Facs;␊
123 if (*(U32 *) (acpi_tables->FacsPointer->Signature) != NAMESEG("FACS"))␊
124 return (0ul);␊
125 ␊
126␉{␊
127␉␉// Find the XFACS which is included in the FACP(64) table␊
128␉␉ACPI_TABLE_FACS *FacsPointer64 = (ACPI_TABLE_FACS *)((U32)acpi_tables->FacpPointer64->XFacs);␊
129␉␉if (*(U32*) (FacsPointer64->Signature) == NAMESEG("FACS"))␊
130␉␉␉acpi_tables->FacsPointer64 = (ACPI_TABLE_FACS *) FacsPointer64;␊
131␉} ␊
132 ␊
133 // Find the MADT table which is one of the table pointers in the RSDT␊
134 acpi_tables->MadtPointer = (ACPI_TABLE_MADT *) GetTablePtr(acpi_tables->RsdtPointer, NAMESEG("APIC"));␊
135 if (acpi_tables->MadtPointer == 0ul)␊
136 return (0ul);␊
137␉␊
138␉// Find the MADT(64) table which is one of the table pointers in the XSDT␊
139 acpi_tables->MadtPointer64 = (ACPI_TABLE_MADT *) GetTablePtr64(acpi_tables->XsdtPointer, NAMESEG("APIC"));␊
140 ␊
141 return (1ul);␊
142}␊
143␊
144//-----------------------------------------------------------------------------␊
145U32 get_num_tables(ACPI_TABLE_RSDT * rsdt)␊
146{␊
147 // Compute number of table pointers included in RSDT␊
148 return ((rsdt->Header.Length - sizeof(ACPI_TABLE_HEADER))␊
149 / sizeof(ACPI_TABLE_HEADER *));␊
150}␊
151␊
152//-----------------------------------------------------------------------------␊
153U32 get_num_tables64(ACPI_TABLE_XSDT * xsdt)␊
154{␊
155 {␊
156 void *null = 0ul;␊
157 if (xsdt == null)␊
158 return 0ul;␊
159 }␊
160 ␊
161 // Compute number of table pointers included in XSDT␊
162 return ((xsdt->Header.Length - sizeof(ACPI_TABLE_HEADER))␊
163 / sizeof(U64));␊
164}␊
165␊
166//-------------------------------------------------------------------------------␊
167//␊
168// Procedure: GetTablePtr - Find ACPI table in RSDT with input signature.␊
169//␊
170//-------------------------------------------------------------------------------␊
171static ACPI_TABLE_HEADER *GetTablePtr(ACPI_TABLE_RSDT * rsdt, U32 signature)␊
172{␊
173 U32 index;␊
174 U32 num_tables;␊
175 ACPI_TABLE_HEADER **table_array = (ACPI_TABLE_HEADER **) rsdt->TableOffsetEntry;␊
176 ␊
177 // Compute number of table pointers included in RSDT␊
178 num_tables = get_num_tables(rsdt);␊
179 ␊
180 for (index = 0; index < num_tables; index++) {␊
181 if ((*(U32 *) (table_array[index]->Signature) == signature) &&␊
182 (GetChecksum(table_array[index], table_array[index]->Length) == 0)) {␊
183 return (table_array[index]);␊
184 }␊
185 }␊
186 return (0);␊
187}␊
188␊
189//-------------------------------------------------------------------------------␊
190//␊
191// Procedure: GetTablePtr64 - Find ACPI table in XSDT with input signature.␊
192//␊
193//-------------------------------------------------------------------------------␊
194#if 0␊
195static ACPI_TABLE_HEADER *GetTablePtr64(ACPI_TABLE_XSDT * xsdt, U32 signature)␊
196{␊
197 U32 index;␊
198 U32 num_tables;␊
199 ACPI_TABLE_HEADER *table = (ACPI_TABLE_HEADER *) xsdt->TableOffsetEntry;␊
200␉␊
201 // Compute number of table pointers included in XSDT␊
202 num_tables = get_num_tables64(xsdt);␊
203␉␊
204 for (index = 0; index < num_tables; index++) {␊
205 if (((U32) (table->Signature) == signature) &&␊
206 (GetChecksum(table, table->Length) == 0)) {␊
207 return (table);␊
208 }␊
209 // Move array pointer to next 64-bit pointer␊
210 table = (ACPI_TABLE_HEADER *) ((U32) table + sizeof(U64));␊
211 }␊
212 return (0);␊
213}␊
214#else␊
215static ACPI_TABLE_HEADER *GetTablePtr64(ACPI_TABLE_XSDT * xsdt, U32 signature)␊
216{␊
217 U32 index;␊
218 U32 num_tables;␊
219 ␊
220 // Compute number of table pointers included in XSDT␊
221 num_tables = get_num_tables64(xsdt);␊
222 ␊
223 for (index = 0; index < num_tables; index++) {␊
224␉␉U64 ptr = xsdt->TableOffsetEntry[index];␊
225␉␉␊
226 if ((*(U32 *) ((ACPI_TABLE_HEADER *) (unsigned long)ptr)->Signature == signature) &&␊
227 (GetChecksum(((ACPI_TABLE_HEADER *) (unsigned long)ptr), ((ACPI_TABLE_HEADER *) (unsigned long)ptr)->Length) == 0)) {␊
228 return (((ACPI_TABLE_HEADER *) (unsigned long)ptr));␊
229 } ␊
230 }␊
231 return (0);␊
232}␊
233#endif␊
234␊
235␊
236//-------------------------------------------------------------------------------␊
237//␊
238// Procedure: GetChecksum - Performs byte checksum␊
239//␊
240//-------------------------------------------------------------------------------␊
241U8 GetChecksum(void *mem_addr, U32 mem_size)␊
242{␊
243 U8 *current = mem_addr;␊
244 U8 *end = current + mem_size;␊
245 U8 checksum = 0;␊
246 ␊
247 for (; current < end; current++)␊
248 checksum = checksum + *current;␊
249 ␊
250 return (checksum);␊
251}␊
252␊
253/*==========================================================================␊
254 * Function to map 32 bit physical address to 64 bit virtual address␊
255 */␊
256␊
257␊
258//-------------------------------------------------------------------------------␊
259//␊
260// Procedure: GetRsdtPointer - Scans given segment for RSDT pointer␊
261//␊
262// Description: Scans for root system description table pointer signature␊
263// ('RSD PTR ') , verifies checksum, and returns pointer to␊
264// RSDT table if found.␊
265//␊
266//-------------------------------------------------------------------------------␊
267static U32 GetRsdtPointer(void *mem_addr, U32 mem_size, ACPI_TABLES * acpi_tables)␊
268{␊
269 U8 *current = mem_addr;␊
270 U8 *end = current + mem_size;␊
271 ␊
272 // Quick sanity check for a valid start address␊
273 if (current == 0ul)␊
274 return (0ul);␊
275 ␊
276 for (; current < end; current += 16) {␊
277 if (*(volatile U64 *)current == NAMESEG64("RSD PTR ")) {␊
278 if (GetChecksum(current, ACPI_RSDP_REV0_SIZE) == 0) {␊
279 // RSD pointer structure checksum okay, lookup the RSDT pointer. ␊
280 acpi_tables->RsdPointer = (ACPI_TABLE_RSDP *)current;␊
281 acpi_tables->RsdtPointer = (ACPI_TABLE_RSDT *) acpi_tables->RsdPointer->RsdtPhysicalAddress;␊
282 if ((acpi_tables->RsdPointer != (void*)0ul) && (acpi_tables->RsdtPointer != (void*)0ul))␊
283 return (1ul);␊
284 else␊
285 return (0ul);␊
286 }␊
287 }␊
288 }␊
289 ␊
290 return (0);␊
291}␊
292␊
293//-------------------------------------------------------------------------------␊
294//␊
295// Procedure: GetXsdtPointer␊
296//␊
297//-------------------------------------------------------------------------------␊
298static U32 GetXsdtPointer(ACPI_TABLES * acpi_tables)␊
299{␊
300 if ((GetChecksum(acpi_tables->RsdPointer, sizeof(ACPI_TABLE_RSDP)) == 0) &&␊
301 (acpi_tables->RsdPointer->Revision == 2) &&␊
302 (acpi_tables->RsdPointer->Length == sizeof(ACPI_TABLE_RSDP))) {␊
303 // RSD pointer structure checksum okay, lookup the XSDT pointer.␊
304 acpi_tables->XsdtPointer = (ACPI_TABLE_XSDT *) (U32) acpi_tables->RsdPointer->XsdtPhysicalAddress;␊
305 return (1ul);␊
306 }␊
307 ␊
308 return (0ul);␊
309}␊
310

Archive Download this file

Revision: 1804