ReactOS 0.4.15-dev-7934-g1dc8d80
tbxfroot.c File Reference
#include "acpi.h"
#include "accommon.h"
#include "actables.h"
Include dependency graph for tbxfroot.c:

Go to the source code of this file.

Macros

#define _COMPONENT   ACPI_TABLES
 

Functions

UINT32 AcpiTbGetRsdpLength (ACPI_TABLE_RSDP *Rsdp)
 
ACPI_STATUS AcpiTbValidateRsdp (ACPI_TABLE_RSDP *Rsdp)
 
ACPI_STATUS ACPI_INIT_FUNCTION AcpiFindRootPointer (ACPI_PHYSICAL_ADDRESS *TableAddress)
 
UINT8AcpiTbScanMemoryForRsdp (UINT8 *StartAddress, UINT32 Length)
 

Macro Definition Documentation

◆ _COMPONENT

#define _COMPONENT   ACPI_TABLES

Definition at line 49 of file tbxfroot.c.

Function Documentation

◆ AcpiFindRootPointer()

ACPI_STATUS ACPI_INIT_FUNCTION AcpiFindRootPointer ( ACPI_PHYSICAL_ADDRESS *  TableAddress)

Definition at line 160 of file tbxfroot.c.

162{
163 UINT8 *TablePtr;
164 UINT8 *MemRover;
166 UINT32 EbdaWindowSize;
167
168
170
171
172 /* 1a) Get the location of the Extended BIOS Data Area (EBDA) */
173
174 TablePtr = AcpiOsMapMemory (
175 (ACPI_PHYSICAL_ADDRESS) ACPI_EBDA_PTR_LOCATION,
177 if (!TablePtr)
178 {
180 "Could not map memory at 0x%8.8X for length %u",
182
184 }
185
187
188 /* Convert segment part to physical address */
189
190 PhysicalAddress <<= 4;
192
193 /* EBDA present? */
194
195 /*
196 * Check that the EBDA pointer from memory is sane and does not point
197 * above valid low memory
198 */
199 if (PhysicalAddress > 0x400 &&
200 PhysicalAddress < 0xA0000)
201 {
202 /*
203 * Calculate the scan window size
204 * The EBDA is not guaranteed to be larger than a KiB and in case
205 * that it is smaller, the scanning function would leave the low
206 * memory and continue to the VGA range.
207 */
208 EbdaWindowSize = ACPI_MIN(ACPI_EBDA_WINDOW_SIZE,
209 0xA0000 - PhysicalAddress);
210
211 /*
212 * 1b) Search EBDA paragraphs
213 */
214 TablePtr = AcpiOsMapMemory (
215 (ACPI_PHYSICAL_ADDRESS) PhysicalAddress,
216 EbdaWindowSize);
217 if (!TablePtr)
218 {
220 "Could not map memory at 0x%8.8X for length %u",
221 PhysicalAddress, EbdaWindowSize));
222
224 }
225
226 MemRover = AcpiTbScanMemoryForRsdp (
227 TablePtr, EbdaWindowSize);
228 AcpiOsUnmapMemory (TablePtr, EbdaWindowSize);
229
230 if (MemRover)
231 {
232 /* Return the physical address */
233
235 (UINT32) ACPI_PTR_DIFF (MemRover, TablePtr);
236
237 *TableAddress = (ACPI_PHYSICAL_ADDRESS) PhysicalAddress;
239 }
240 }
241
242 /*
243 * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh
244 */
245 TablePtr = AcpiOsMapMemory (
246 (ACPI_PHYSICAL_ADDRESS) ACPI_HI_RSDP_WINDOW_BASE,
248
249 if (!TablePtr)
250 {
252 "Could not map memory at 0x%8.8X for length %u",
254
256 }
257
258 MemRover = AcpiTbScanMemoryForRsdp (
259 TablePtr, ACPI_HI_RSDP_WINDOW_SIZE);
261
262 if (MemRover)
263 {
264 /* Return the physical address */
265
267 (ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (MemRover, TablePtr));
268
269 *TableAddress = (ACPI_PHYSICAL_ADDRESS) PhysicalAddress;
271 }
272
273 /* A valid RSDP was not found */
274
275 ACPI_BIOS_ERROR ((AE_INFO, "A valid RSDP was not found"));
277}
unsigned char UINT8
unsigned int UINT32
#define AE_NOT_FOUND
Definition: acexcep.h:113
#define AE_NO_MEMORY
Definition: acexcep.h:112
#define AE_OK
Definition: acexcep.h:97
#define ACPI_MOVE_16_TO_32(d, s)
Definition: acmacros.h:142
#define return_ACPI_STATUS(s)
Definition: acoutput.h:496
#define ACPI_FUNCTION_TRACE(a)
Definition: acoutput.h:480
#define ACPI_BIOS_ERROR(plist)
Definition: acoutput.h:243
#define ACPI_ERROR(plist)
Definition: acoutput.h:240
#define AE_INFO
Definition: acoutput.h:230
void * AcpiOsMapMemory(ACPI_PHYSICAL_ADDRESS Where, ACPI_SIZE Length)
Definition: osl.c:108
void AcpiOsUnmapMemory(void *LogicalAddress, ACPI_SIZE Size)
Definition: osl.c:128
#define ACPI_MIN(a, b)
Definition: actypes.h:535
#define ACPI_PTR_DIFF(a, b)
Definition: actypes.h:548
#define ACPI_EBDA_PTR_LOCATION
Definition: acconfig.h:188
#define ACPI_HI_RSDP_WINDOW_SIZE
Definition: acconfig.h:192
#define ACPI_HI_RSDP_WINDOW_BASE
Definition: acconfig.h:191
#define ACPI_EBDA_WINDOW_SIZE
Definition: acconfig.h:190
#define ACPI_EBDA_PTR_LENGTH
Definition: acconfig.h:189
ACPI_STATUS ACPI_INIT_FUNCTION AcpiFindRootPointer(ACPI_PHYSICAL_ADDRESS *TableAddress)
Definition: tbxfroot.c:160
UINT8 * AcpiTbScanMemoryForRsdp(UINT8 *StartAddress, UINT32 Length)
Definition: tbxfroot.c:296
_Must_inspect_result_ typedef _In_ PHYSICAL_ADDRESS PhysicalAddress
Definition: iotypes.h:1098

Referenced by AcpiFindRootPointer(), and AcpiOsGetRootPointer().

◆ AcpiTbGetRsdpLength()

UINT32 AcpiTbGetRsdpLength ( ACPI_TABLE_RSDP Rsdp)

Definition at line 66 of file tbxfroot.c.

68{
69
71 {
72 /* BAD Signature */
73
74 return (0);
75 }
76
77 /* "Length" field is available if table version >= 2 */
78
79 if (Rsdp->Revision >= 2)
80 {
81 return (Rsdp->Length);
82 }
83 else
84 {
86 }
87}
#define ACPI_VALIDATE_RSDP_SIG(a)
Definition: actypes.h:573
#define ACPI_RSDP_CHECKSUM_LENGTH
Definition: acconfig.h:210
UINT32 Length
Definition: actbl.h:156
UINT8 Revision
Definition: actbl.h:154
char Signature[8]
Definition: actbl.h:151

◆ AcpiTbScanMemoryForRsdp()

UINT8 * AcpiTbScanMemoryForRsdp ( UINT8 StartAddress,
UINT32  Length 
)

Definition at line 296 of file tbxfroot.c.

299{
301 UINT8 *MemRover;
302 UINT8 *EndAddress;
303
304
305 ACPI_FUNCTION_TRACE (TbScanMemoryForRsdp);
306
307
308 EndAddress = StartAddress + Length;
309
310 /* Search from given start address for the requested length */
311
312 for (MemRover = StartAddress; MemRover < EndAddress;
313 MemRover += ACPI_RSDP_SCAN_STEP)
314 {
315 /* The RSDP signature and checksum must both be correct */
316
318 ACPI_CAST_PTR (ACPI_TABLE_RSDP, MemRover));
319 if (ACPI_SUCCESS (Status))
320 {
321 /* Sig and checksum valid, we have found a real RSDP */
322
324 "RSDP located at physical address %p\n", MemRover));
325 return_PTR (MemRover);
326 }
327
328 /* No sig match or bad checksum, keep searching */
329 }
330
331 /* Searched entire block, no RSDP was found */
332
334 "Searched entire block from %p, valid RSDP was not found\n",
335 StartAddress));
337}
#define ACPI_SUCCESS(a)
Definition: acexcep.h:94
#define ACPI_DEBUG_PRINT(pl)
Definition: acoutput.h:475
#define return_PTR(s)
Definition: acoutput.h:497
#define ACPI_DB_INFO
Definition: acoutput.h:153
UINT32 ACPI_STATUS
Definition: actypes.h:460
#define ACPI_CAST_PTR(t, p)
Definition: actypes.h:544
#define NULL
Definition: types.h:112
#define ACPI_RSDP_SCAN_STEP
Definition: acconfig.h:193
Status
Definition: gdiplustypes.h:25
_In_ ULONG _In_ ULONG _In_ ULONG Length
Definition: ntddpcm.h:102
ACPI_STATUS AcpiTbValidateRsdp(ACPI_TABLE_RSDP *Rsdp)
Definition: tbxfroot.c:103

Referenced by AcpiFindRootPointer().

◆ AcpiTbValidateRsdp()

ACPI_STATUS AcpiTbValidateRsdp ( ACPI_TABLE_RSDP Rsdp)

Definition at line 103 of file tbxfroot.c.

105{
106
107 /*
108 * The signature and checksum must both be correct
109 *
110 * Note: Sometimes there exists more than one RSDP in memory; the valid
111 * RSDP has a valid checksum, all others have an invalid checksum.
112 */
114 {
115 /* Nope, BAD Signature */
116
117 return (AE_BAD_SIGNATURE);
118 }
119
120 /* Check the standard checksum */
121
123 {
124 return (AE_BAD_CHECKSUM);
125 }
126
127 /* Check extended checksum if table version >= 2 */
128
129 if ((Rsdp->Revision >= 2) &&
131 {
132 return (AE_BAD_CHECKSUM);
133 }
134
135 return (AE_OK);
136}
#define AE_BAD_CHECKSUM
Definition: acexcep.h:169
#define AE_BAD_SIGNATURE
Definition: acexcep.h:167
UINT8 AcpiUtChecksum(UINT8 *Buffer, UINT32 Length)
Definition: utcksum.c:213
#define ACPI_RSDP_XCHECKSUM_LENGTH
Definition: acconfig.h:211

Referenced by AcpiTbScanMemoryForRsdp().