*****************************************************************************/
/*
- * Copyright (C) 2000 - 2004, R. Byron Moore
+ * Copyright (C) 2000 - 2005, R. Byron Moore
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* POSSIBILITY OF SUCH DAMAGES.
*/
+#include <linux/module.h>
#include <acpi/acpi.h>
#include <acpi/actables.h>
return_ACPI_STATUS (AE_AML_STRING_LIMIT);
}
- /* Find the table */
+ if (!ACPI_STRNCMP (signature, DSDT_SIG, ACPI_NAME_SIZE)) {
+ /*
+ * The DSDT pointer is contained in the FADT, not the RSDT.
+ * This code should suffice, because the only code that would perform
+ * a "find" on the DSDT is the data_table_region() AML opcode -- in
+ * which case, the DSDT is guaranteed to be already loaded.
+ * If this becomes insufficient, the FADT will have to be found first.
+ */
+ if (!acpi_gbl_DSDT) {
+ return_ACPI_STATUS (AE_NO_ACPI_TABLES);
+ }
- status = acpi_get_firmware_table (signature, 1,
- ACPI_LOGICAL_ADDRESSING, &table);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
+ table = acpi_gbl_DSDT;
+ }
+ else {
+ /* Find the table */
+
+ status = acpi_get_firmware_table (signature, 1,
+ ACPI_LOGICAL_ADDRESSING, &table);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
}
/* Check oem_id and oem_table_id */
- if ((oem_id[0] && ACPI_STRCMP (oem_id, table->oem_id)) ||
- (oem_table_id[0] && ACPI_STRCMP (oem_table_id, table->oem_table_id))) {
+ if ((oem_id[0] && ACPI_STRNCMP (
+ oem_id, table->oem_id, sizeof (table->oem_id))) ||
+ (oem_table_id[0] && ACPI_STRNCMP (
+ oem_table_id, table->oem_table_id, sizeof (table->oem_table_id)))) {
return_ACPI_STATUS (AE_AML_NAME_NOT_FOUND);
}
+ ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Found table [%4.4s]\n", table->signature));
*table_ptr = table;
return_ACPI_STATUS (AE_OK);
}
}
return_ACPI_STATUS (status);
}
+EXPORT_SYMBOL(acpi_get_firmware_table);
/* TBD: Move to a new file */
status = acpi_tb_find_rsdp (&table_info, flags);
if (ACPI_FAILURE (status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "RSDP structure not found, %s Flags=%X\n",
+ ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+ "RSDP structure not found, %s Flags=%X\n",
acpi_format_exception (status), flags));
return_ACPI_STATUS (AE_NO_ACPI_TABLES);
}
u8 *start_address,
u32 length)
{
- u32 offset;
u8 *mem_rover;
+ u8 *end_address;
+ u8 checksum;
ACPI_FUNCTION_TRACE ("tb_scan_memory_for_rsdp");
- /* Search from given start addr for the requested length */
+ end_address = start_address + length;
- for (offset = 0, mem_rover = start_address;
- offset < length;
- offset += ACPI_RSDP_SCAN_STEP, mem_rover += ACPI_RSDP_SCAN_STEP) {
+ /* Search from given start address for the requested length */
+ for (mem_rover = start_address; mem_rover < end_address;
+ mem_rover += ACPI_RSDP_SCAN_STEP) {
/* The signature and checksum must both be correct */
- if (ACPI_STRNCMP ((char *) mem_rover,
- RSDP_SIG, sizeof (RSDP_SIG)-1) == 0 &&
- acpi_tb_checksum (mem_rover, ACPI_RSDP_CHECKSUM_LENGTH) == 0) {
- /* If so, we have found the RSDP */
+ if (ACPI_STRNCMP ((char *) mem_rover, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) {
+ /* No signature match, keep looking */
+
+ continue;
+ }
+
+ /* Signature matches, check the appropriate checksum */
+
+ if ((ACPI_CAST_PTR (struct rsdp_descriptor, mem_rover))->revision < 2) {
+ /* ACPI version 1.0 */
+
+ checksum = acpi_tb_checksum (mem_rover, ACPI_RSDP_CHECKSUM_LENGTH);
+ }
+ else {
+ /* Post ACPI 1.0, use extended_checksum */
+
+ checksum = acpi_tb_checksum (mem_rover, ACPI_RSDP_XCHECKSUM_LENGTH);
+ }
+
+ if (checksum == 0) {
+ /* Checksum valid, we have found a valid RSDP */
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
- "RSDP located at physical address %p\n",mem_rover));
+ "RSDP located at physical address %p\n", mem_rover));
return_PTR (mem_rover);
}
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
+ "Found an RSDP at physical address %p, but it has a bad checksum\n",
+ mem_rover));
}
/* Searched entire block, no RSDP was found */
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO,"Searched entire block, no RSDP was found.\n"));
+ ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
+ "Searched entire block, no valid RSDP was found.\n"));
return_PTR (NULL);
}
ACPI_EBDA_PTR_LENGTH,
(void *) &table_ptr);
if (ACPI_FAILURE (status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not map memory at %8.8X for length %X\n",
+ ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+ "Could not map memory at %8.8X for length %X\n",
ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH));
return_ACPI_STATUS (status);
}
ACPI_EBDA_WINDOW_SIZE,
(void *) &table_ptr);
if (ACPI_FAILURE (status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not map memory at %8.8X for length %X\n",
+ ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+ "Could not map memory at %8.8X for length %X\n",
physical_address, ACPI_EBDA_WINDOW_SIZE));
return_ACPI_STATUS (status);
}
ACPI_HI_RSDP_WINDOW_SIZE,
(void *) &table_ptr);
if (ACPI_FAILURE (status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not map memory at %8.8X for length %X\n",
+ ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+ "Could not map memory at %8.8X for length %X\n",
ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE));
return_ACPI_STATUS (status);
}
git://git.onelab.eu / linux-2.6.git / blobdiff