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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->RSDT->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->FACP->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->SsdtPointer = null;␊
76 acpi_tables->XsdtPointer = null;␊
77 acpi_tables->FacpPointer64 = null;␊
78 }␊
79 ␊
80 // Find the RSDT pointer by scanning EBDA/E000/F000 segments.␊
81 ␊
82 // Init memory address as EBDA and scan 1KB region␊
83 success = GetRsdtPointer((void *)(((U32) * (U16 *) 0x40E) << 4), 0x400, acpi_tables);␊
84 ␊
85 // Init memory address as E000 segment and scan 64KB region␊
86 if (!success)␊
87 success = GetRsdtPointer((void *)0x0E0000, 0x10000, acpi_tables);␊
88 ␊
89 // Init memory address as F000 segment and scan 64KB region␊
90 if (!success)␊
91 success = GetRsdtPointer((void *)0x0F0000, 0x10000, acpi_tables);␊
92 ␊
93 if (!success)␊
94 return (0ul);␊
95 ␊
96 GetXsdtPointer(acpi_tables);␊
97 ␊
98 // Find FACP table pointer which is one of table pointers in the RDST␊
99 acpi_tables->FacpPointer = (ACPI_TABLE_FADT *)␊
100 GetTablePtr(acpi_tables->RsdtPointer, NAMESEG("FACP"));␊
101 if (acpi_tables->FacpPointer == 0ul)␊
102 return (0ul);␊
103 ␊
104 // Find FACP(64) table pointer which is one of table pointers in the XDST␊
105 acpi_tables->FacpPointer64 = (ACPI_TABLE_FADT *)␊
106 GetTablePtr64(acpi_tables->XsdtPointer, NAMESEG("FACP"));␊
107 ␊
108 // Find the DSDT which is included in the FACP table␊
109 acpi_tables->DsdtPointer = (ACPI_TABLE_DSDT *) acpi_tables->FacpPointer->Dsdt;␊
110 if ((*(U32 *) (acpi_tables->DsdtPointer->Header.Signature) != NAMESEG("DSDT")) ||␊
111 (GetChecksum(acpi_tables->DsdtPointer, acpi_tables->DsdtPointer->Header.Length) != 0))␊
112 return (0ul);␊
113 ␊
114␉{␊
115␉␉// Find the XDSDT which is included in the FACP(64) table␊
116␉␉ACPI_TABLE_DSDT *DsdtPointer64 = (ACPI_TABLE_DSDT *)((U32)acpi_tables->FacpPointer64->XDsdt);␊
117␉␉if ((*(U32*) (DsdtPointer64->Header.Signature) == NAMESEG("DSDT")) &&␊
118␉␉␉(GetChecksum(DsdtPointer64, DsdtPointer64->Header.Length) == 0))␊
119␉␉␉acpi_tables->DsdtPointer64 = (ACPI_TABLE_DSDT *) DsdtPointer64;␊
120␉} ␊
121 ␊
122 // Find the FACS which is included in the FACP table␊
123 acpi_tables->FacsPointer = (ACPI_TABLE_FACS *) acpi_tables->FacpPointer->Facs;␊
124 if (*(U32 *) (acpi_tables->FacsPointer->Signature) != NAMESEG("FACS"))␊
125 return (0ul);␊
126 ␊
127␉{␊
128␉␉// Find the XFACS which is included in the FACP(64) table␊
129␉␉ACPI_TABLE_FACS *FacsPointer64 = (ACPI_TABLE_FACS *)((U32)acpi_tables->FacpPointer64->XFacs);␊
130␉␉if (*(U32*) (FacsPointer64->Signature) == NAMESEG("FACS"))␊
131␉␉␉acpi_tables->FacsPointer64 = (ACPI_TABLE_FACS *) FacsPointer64;␊
132␉} ␊
133 ␊
134 // Find the MADT table which is one of the table pointers in the RSDT␊
135 acpi_tables->MadtPointer = (ACPI_TABLE_MADT *) GetTablePtr(acpi_tables->RsdtPointer, NAMESEG("APIC"));␊
136 if (acpi_tables->MadtPointer == 0ul)␊
137 return (0ul);␊
138␉␊
139␉// Find the MADT(64) table which is one of the table pointers in the XSDT␊
140 acpi_tables->MadtPointer64 = (ACPI_TABLE_MADT *) GetTablePtr64(acpi_tables->XsdtPointer, NAMESEG("APIC"));␊
141 ␊
142 return (1ul);␊
143}␊
144␊
145//-----------------------------------------------------------------------------␊
146U32 get_num_tables(ACPI_TABLE_RSDT * rsdt)␊
147{␊
148 // Compute number of table pointers included in RSDT␊
149 return ((rsdt->Header.Length - sizeof(ACPI_TABLE_HEADER))␊
150 / sizeof(ACPI_TABLE_HEADER *));␊
151}␊
152␊
153//-----------------------------------------------------------------------------␊
154U32 get_num_tables64(ACPI_TABLE_XSDT * xsdt)␊
155{␊
156 {␊
157 void *null = 0ul;␊
158 if (xsdt == null)␊
159 return 0ul;␊
160 }␊
161 ␊
162 // Compute number of table pointers included in XSDT␊
163 return ((xsdt->Header.Length - sizeof(ACPI_TABLE_HEADER))␊
164 / sizeof(U64));␊
165}␊
166␊
167//-------------------------------------------------------------------------------␊
168//␊
169// Procedure: GetTablePtr - Find ACPI table in RSDT with input signature.␊
170//␊
171//-------------------------------------------------------------------------------␊
172static ACPI_TABLE_HEADER *GetTablePtr(ACPI_TABLE_RSDT * rsdt, U32 signature)␊
173{␊
174 U32 index;␊
175 U32 num_tables;␊
176 ACPI_TABLE_HEADER **table_array = (ACPI_TABLE_HEADER **) rsdt->TableOffsetEntry;␊
177 ␊
178 // Compute number of table pointers included in RSDT␊
179 num_tables = get_num_tables(rsdt);␊
180 ␊
181 for (index = 0; index < num_tables; index++) {␊
182 if ((*(U32 *) (table_array[index]->Signature) == signature) &&␊
183 (GetChecksum(table_array[index], table_array[index]->Length) == 0)) {␊
184 return (table_array[index]);␊
185 }␊
186 }␊
187 return (0);␊
188}␊
189␊
190//-------------------------------------------------------------------------------␊
191//␊
192// Procedure: GetTablePtr64 - Find ACPI table in XSDT with input signature.␊
193//␊
194//-------------------------------------------------------------------------------␊
195static ACPI_TABLE_HEADER *GetTablePtr64(ACPI_TABLE_XSDT * xsdt, U32 signature)␊
196{␊
197 U32 index;␊
198 U32 num_tables;␊
199 ␊
200 // Compute number of table pointers included in XSDT␊
201 num_tables = get_num_tables64(xsdt);␊
202 ␊
203 for (index = 0; index < num_tables; index++) {␊
204␉␉U64 ptr = xsdt->TableOffsetEntry[index];␊
205␉␉␊
206 if ((*(U32 *) ((ACPI_TABLE_HEADER *) (unsigned long)ptr)->Signature == signature) &&␊
207 (GetChecksum(((ACPI_TABLE_HEADER *) (unsigned long)ptr), ((ACPI_TABLE_HEADER *) (unsigned long)ptr)->Length) == 0)) {␊
208 return (((ACPI_TABLE_HEADER *) (unsigned long)ptr));␊
209 } ␊
210 }␊
211 return (0);␊
212}␊
213␊
214␊
215␊
216//-------------------------------------------------------------------------------␊
217//␊
218// Procedure: GetChecksum - Performs byte checksum␊
219//␊
220//-------------------------------------------------------------------------------␊
221U8 GetChecksum(void *mem_addr, U32 mem_size)␊
222{␊
223 U8 *current = mem_addr;␊
224 U8 *end = current + mem_size;␊
225 U8 checksum = 0;␊
226 ␊
227 for (; current < end; current++)␊
228 checksum = checksum + *current;␊
229 ␊
230 return (checksum);␊
231}␊
232␊
233/*==========================================================================␊
234 * Function to map 32 bit physical address to 64 bit virtual address␊
235 */␊
236␊
237␊
238//-------------------------------------------------------------------------------␊
239//␊
240// Procedure: GetRsdtPointer - Scans given segment for RSDT pointer␊
241//␊
242// Description: Scans for root system description table pointer signature␊
243// ('RSD PTR ') , verifies checksum, and returns pointer to␊
244// RSDT table if found.␊
245//␊
246//-------------------------------------------------------------------------------␊
247static U32 GetRsdtPointer(void *mem_addr, U32 mem_size, ACPI_TABLES * acpi_tables)␊
248{␊
249 U8 *current = mem_addr;␊
250 U8 *end = current + mem_size;␊
251 ␊
252 // Quick sanity check for a valid start address␊
253 if (current == 0ul)␊
254 return (0ul);␊
255 ␊
256 for (; current < end; current += 16) {␊
257 if (*(volatile U64 *)current == NAMESEG64("RSD PTR ")) {␊
258 if (GetChecksum(current, ACPI_RSDP_REV0_SIZE) == 0) {␊
259 // RSD pointer structure checksum okay, lookup the RSDT pointer. ␊
260 acpi_tables->RsdPointer = (ACPI_TABLE_RSDP *)current;␊
261 acpi_tables->RsdtPointer = (ACPI_TABLE_RSDT *) acpi_tables->RsdPointer->RsdtPhysicalAddress;␊
262 if ((acpi_tables->RsdPointer != 0) && (acpi_tables->RsdtPointer != 0))␊
263 return (1ul);␊
264 else␊
265 return (0ul);␊
266 }␊
267 }␊
268 }␊
269 ␊
270 return (0);␊
271}␊
272␊
273//-------------------------------------------------------------------------------␊
274//␊
275// Procedure: GetXsdtPointer␊
276//␊
277//-------------------------------------------------------------------------------␊
278static U32 GetXsdtPointer(ACPI_TABLES * acpi_tables)␊
279{␊
280 if ((GetChecksum(acpi_tables->RsdPointer, sizeof(ACPI_TABLE_RSDP)) == 0) &&␊
281 (acpi_tables->RsdPointer->Revision == 2) &&␊
282 (acpi_tables->RsdPointer->Length == sizeof(ACPI_TABLE_RSDP))) {␊
283 // RSD pointer structure checksum okay, lookup the XSDT pointer.␊
284 acpi_tables->XsdtPointer = (ACPI_TABLE_XSDT *) (U32) acpi_tables->RsdPointer->XsdtPhysicalAddress;␊
285 return (1ul);␊
286 }␊
287 ␊
288 return (0ul);␊
289}␊
290

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