*****************************************************************************/
/*
- * Copyright (C) 2000 - 2004, R. Byron Moore
+ * Copyright (C) 2000 - 2006, R. Byron Moore
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* POSSIBILITY OF SUCH DAMAGES.
*/
-
#include <acpi/acpi.h>
#include <acpi/actables.h>
-
#define _COMPONENT ACPI_TABLES
- ACPI_MODULE_NAME ("tbxfroot")
+ACPI_MODULE_NAME("tbxfroot")
+
+/* Local prototypes */
+static acpi_status
+acpi_tb_find_rsdp(struct acpi_table_desc *table_info, u32 flags);
+
+static u8 *acpi_tb_scan_memory_for_rsdp(u8 * start_address, u32 length);
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_validate_rsdp
+ *
+ * PARAMETERS: Rsdp - Pointer to unvalidated RSDP
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Validate the RSDP (ptr)
+ *
+ ******************************************************************************/
+
+acpi_status acpi_tb_validate_rsdp(struct rsdp_descriptor *rsdp)
+{
+ ACPI_FUNCTION_ENTRY();
+ /*
+ * The signature and checksum must both be correct
+ */
+ if (ACPI_STRNCMP((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0) {
+
+ /* Nope, BAD Signature */
+
+ return (AE_BAD_SIGNATURE);
+ }
+
+ /* Check the standard checksum */
+
+ if (acpi_tb_sum_table(rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) {
+ return (AE_BAD_CHECKSUM);
+ }
+
+ /* Check extended checksum if table version >= 2 */
+
+ if ((rsdp->revision >= 2) &&
+ (acpi_tb_sum_table(rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0)) {
+ return (AE_BAD_CHECKSUM);
+ }
+
+ return (AE_OK);
+}
/*******************************************************************************
*
*
* PARAMETERS: Signature - String with ACPI table signature
* oem_id - String with the table OEM ID
- * oem_table_id - String with the OEM Table ID.
+ * oem_table_id - String with the OEM Table ID
+ * table_ptr - Where the table pointer is returned
*
* RETURN: Status
*
******************************************************************************/
acpi_status
-acpi_tb_find_table (
- char *signature,
- char *oem_id,
- char *oem_table_id,
- struct acpi_table_header **table_ptr)
+acpi_tb_find_table(char *signature,
+ char *oem_id,
+ char *oem_table_id, struct acpi_table_header ** table_ptr)
{
- acpi_status status;
- struct acpi_table_header *table;
-
-
- ACPI_FUNCTION_TRACE ("tb_find_table");
+ acpi_status status;
+ struct acpi_table_header *table;
+ ACPI_FUNCTION_TRACE(tb_find_table);
/* Validate string lengths */
- if ((ACPI_STRLEN (signature) > ACPI_NAME_SIZE) ||
- (ACPI_STRLEN (oem_id) > sizeof (table->oem_id)) ||
- (ACPI_STRLEN (oem_table_id) > sizeof (table->oem_table_id))) {
- return_ACPI_STATUS (AE_AML_STRING_LIMIT);
+ if ((ACPI_STRLEN(signature) > ACPI_NAME_SIZE) ||
+ (ACPI_STRLEN(oem_id) > sizeof(table->oem_id)) ||
+ (ACPI_STRLEN(oem_table_id) > sizeof(table->oem_table_id))) {
+ return_ACPI_STATUS(AE_AML_STRING_LIMIT);
}
- /* Find the table */
-
- status = acpi_get_firmware_table (signature, 1,
- ACPI_LOGICAL_ADDRESSING, &table);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
+ if (ACPI_COMPARE_NAME(signature, DSDT_SIG)) {
+ /*
+ * 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);
+ }
+ 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))) {
- return_ACPI_STATUS (AE_AML_NAME_NOT_FOUND);
+ 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(AE_OK);
}
-
/*******************************************************************************
*
* FUNCTION: acpi_get_firmware_table
* Instance - the non zero instance of the table, allows
* support for multiple tables of the same type
* Flags - Physical/Virtual support
- * ret_buffer - pointer to a structure containing a buffer to
- * receive the table
+ * table_pointer - Where a buffer containing the table is
+ * returned
*
* RETURN: Status
*
- * DESCRIPTION: This function is called to get an ACPI table. The caller
- * supplies an out_buffer large enough to contain the entire ACPI
- * table. Upon completion
- * the out_buffer->Length field will indicate the number of bytes
- * copied into the out_buffer->buf_ptr buffer. This table will be
- * a complete table including the header.
+ * DESCRIPTION: This function is called to get an ACPI table. A buffer is
+ * allocated for the table and returned in table_pointer.
+ * This table will be a complete table including the header.
*
******************************************************************************/
acpi_status
-acpi_get_firmware_table (
- acpi_string signature,
- u32 instance,
- u32 flags,
- struct acpi_table_header **table_pointer)
+acpi_get_firmware_table(acpi_string signature,
+ u32 instance,
+ u32 flags, struct acpi_table_header **table_pointer)
{
- struct acpi_pointer rsdp_address;
- struct acpi_pointer address;
- acpi_status status;
- struct acpi_table_header header;
- struct acpi_table_desc table_info;
- struct acpi_table_desc rsdt_info;
- u32 table_count;
- u32 i;
- u32 j;
-
-
- ACPI_FUNCTION_TRACE ("acpi_get_firmware_table");
+ acpi_status status;
+ struct acpi_pointer address;
+ struct acpi_table_header *header = NULL;
+ struct acpi_table_desc *table_info = NULL;
+ struct acpi_table_desc *rsdt_info;
+ u32 table_count;
+ u32 i;
+ u32 j;
+ ACPI_FUNCTION_TRACE(acpi_get_firmware_table);
/*
* Ensure that at least the table manager is initialized. We don't
- * require that the entire ACPI subsystem is up for this interface
- */
-
- /*
- * If we have a buffer, we must have a length too
+ * require that the entire ACPI subsystem is up for this interface.
+ * If we have a buffer, we must have a length too
*/
- if ((instance == 0) ||
- (!signature) ||
- (!table_pointer)) {
- return_ACPI_STATUS (AE_BAD_PARAMETER);
+ if ((instance == 0) || (!signature) || (!table_pointer)) {
+ return_ACPI_STATUS(AE_BAD_PARAMETER);
}
- rsdt_info.pointer = NULL;
+ /* Ensure that we have a RSDP */
if (!acpi_gbl_RSDP) {
+
/* Get the RSDP */
- status = acpi_os_get_root_pointer (flags, &rsdp_address);
- if (ACPI_FAILURE (status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "RSDP not found\n"));
- return_ACPI_STATUS (AE_NO_ACPI_TABLES);
+ status = acpi_os_get_root_pointer(flags, &address);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "RSDP not found\n"));
+ return_ACPI_STATUS(AE_NO_ACPI_TABLES);
}
/* Map and validate the RSDP */
if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) {
- status = acpi_os_map_memory (rsdp_address.pointer.physical, sizeof (struct rsdp_descriptor),
- (void *) &acpi_gbl_RSDP);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
+ status = acpi_os_map_memory(address.pointer.physical,
+ sizeof(struct
+ rsdp_descriptor),
+ (void *)&acpi_gbl_RSDP);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
}
- }
- else {
- acpi_gbl_RSDP = rsdp_address.pointer.logical;
- }
-
- /*
- * The signature and checksum must both be correct
- */
- if (ACPI_STRNCMP ((char *) acpi_gbl_RSDP, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) {
- /* Nope, BAD Signature */
-
- return_ACPI_STATUS (AE_BAD_SIGNATURE);
+ } else {
+ acpi_gbl_RSDP = address.pointer.logical;
}
- if (acpi_tb_checksum (acpi_gbl_RSDP, ACPI_RSDP_CHECKSUM_LENGTH) != 0) {
- /* Nope, BAD Checksum */
+ /* The RDSP signature and checksum must both be correct */
- return_ACPI_STATUS (AE_BAD_CHECKSUM);
+ status = acpi_tb_validate_rsdp(acpi_gbl_RSDP);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
}
}
- /* Get the RSDT and validate it */
+ /* Get the RSDT address via the RSDP */
- acpi_tb_get_rsdt_address (&address);
-
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
- "RSDP located at %p, RSDT physical=%8.8X%8.8X \n",
- acpi_gbl_RSDP,
- ACPI_FORMAT_UINT64 (address.pointer.value)));
+ acpi_tb_get_rsdt_address(&address);
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "RSDP located at %p, RSDT physical=%8.8X%8.8X\n",
+ acpi_gbl_RSDP,
+ ACPI_FORMAT_UINT64(address.pointer.value)));
/* Insert processor_mode flags */
address.pointer_type |= flags;
- status = acpi_tb_get_table (&address, &rsdt_info);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
+ /* Get and validate the RSDT */
+
+ rsdt_info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_table_desc));
+ if (!rsdt_info) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
}
- status = acpi_tb_validate_rsdt (rsdt_info.pointer);
- if (ACPI_FAILURE (status)) {
+ status = acpi_tb_get_table(&address, rsdt_info);
+ if (ACPI_FAILURE(status)) {
goto cleanup;
}
- /* Get the number of table pointers within the RSDT */
+ status = acpi_tb_validate_rsdt(rsdt_info->pointer);
+ if (ACPI_FAILURE(status)) {
+ goto cleanup;
+ }
+
+ /* Allocate a scratch table header and table descriptor */
- table_count = acpi_tb_get_table_count (acpi_gbl_RSDP, rsdt_info.pointer);
+ header = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
+ if (!header) {
+ status = AE_NO_MEMORY;
+ goto cleanup;
+ }
+
+ table_info = ACPI_ALLOCATE(sizeof(struct acpi_table_desc));
+ if (!table_info) {
+ status = AE_NO_MEMORY;
+ goto cleanup;
+ }
+ /* Get the number of table pointers within the RSDT */
+
+ table_count =
+ acpi_tb_get_table_count(acpi_gbl_RSDP, rsdt_info->pointer);
address.pointer_type = acpi_gbl_table_flags | flags;
/*
* requested table
*/
for (i = 0, j = 0; i < table_count; i++) {
- /* Get the next table pointer, handle RSDT vs. XSDT */
-
- if (acpi_gbl_RSDP->revision < 2) {
- address.pointer.value = (ACPI_CAST_PTR (RSDT_DESCRIPTOR, rsdt_info.pointer))->table_offset_entry[i];
- }
- else {
+ /*
+ * Get the next table pointer, handle RSDT vs. XSDT
+ * RSDT pointers are 32 bits, XSDT pointers are 64 bits
+ */
+ if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) {
address.pointer.value =
- (ACPI_CAST_PTR (XSDT_DESCRIPTOR, rsdt_info.pointer))->table_offset_entry[i];
+ (ACPI_CAST_PTR
+ (struct rsdt_descriptor,
+ rsdt_info->pointer))->table_offset_entry[i];
+ } else {
+ address.pointer.value =
+ (ACPI_CAST_PTR
+ (struct xsdt_descriptor,
+ rsdt_info->pointer))->table_offset_entry[i];
}
/* Get the table header */
- status = acpi_tb_get_table_header (&address, &header);
- if (ACPI_FAILURE (status)) {
+ status = acpi_tb_get_table_header(&address, header);
+ if (ACPI_FAILURE(status)) {
goto cleanup;
}
/* Compare table signatures and table instance */
- if (!ACPI_STRNCMP (header.signature, signature, ACPI_NAME_SIZE)) {
+ if (ACPI_COMPARE_NAME(header->signature, signature)) {
+
/* An instance of the table was found */
j++;
if (j >= instance) {
+
/* Found the correct instance, get the entire table */
- status = acpi_tb_get_table_body (&address, &header, &table_info);
- if (ACPI_FAILURE (status)) {
+ status =
+ acpi_tb_get_table_body(&address, header,
+ table_info);
+ if (ACPI_FAILURE(status)) {
goto cleanup;
}
- *table_pointer = table_info.pointer;
+ *table_pointer = table_info->pointer;
goto cleanup;
}
}
status = AE_NOT_EXIST;
+ cleanup:
+ if (rsdt_info->pointer) {
+ acpi_os_unmap_memory(rsdt_info->pointer,
+ (acpi_size) rsdt_info->pointer->length);
+ }
+ ACPI_FREE(rsdt_info);
-cleanup:
- acpi_os_unmap_memory (rsdt_info.pointer, (acpi_size) rsdt_info.pointer->length);
- return_ACPI_STATUS (status);
+ if (header) {
+ ACPI_FREE(header);
+ }
+ if (table_info) {
+ ACPI_FREE(table_info);
+ }
+ return_ACPI_STATUS(status);
}
+ACPI_EXPORT_SYMBOL(acpi_get_firmware_table)
/* TBD: Move to a new file */
-
#if ACPI_MACHINE_WIDTH != 16
-
/*******************************************************************************
*
* FUNCTION: acpi_find_root_pointer
*
- * PARAMETERS: **rsdp_address - Where to place the RSDP address
- * Flags - Logical/Physical addressing
+ * PARAMETERS: Flags - Logical/Physical addressing
+ * rsdp_address - Where to place the RSDP address
*
* RETURN: Status, Physical address of the RSDP
*
* DESCRIPTION: Find the RSDP
*
******************************************************************************/
-
-acpi_status
-acpi_find_root_pointer (
- u32 flags,
- struct acpi_pointer *rsdp_address)
+acpi_status acpi_find_root_pointer(u32 flags, struct acpi_pointer *rsdp_address)
{
- struct acpi_table_desc table_info;
- acpi_status status;
-
-
- ACPI_FUNCTION_TRACE ("acpi_find_root_pointer");
+ struct acpi_table_desc table_info;
+ acpi_status status;
+ ACPI_FUNCTION_TRACE(acpi_find_root_pointer);
/* Get the RSDP */
- 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_format_exception (status), flags));
- return_ACPI_STATUS (AE_NO_ACPI_TABLES);
+ status = acpi_tb_find_rsdp(&table_info, flags);
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status,
+ "RSDP structure not found - Flags=%X", flags));
+
+ return_ACPI_STATUS(AE_NO_ACPI_TABLES);
}
rsdp_address->pointer_type = ACPI_PHYSICAL_POINTER;
rsdp_address->pointer.physical = table_info.physical_address;
- return_ACPI_STATUS (AE_OK);
+ return_ACPI_STATUS(AE_OK);
}
+ACPI_EXPORT_SYMBOL(acpi_find_root_pointer)
/*******************************************************************************
*
* DESCRIPTION: Search a block of memory for the RSDP signature
*
******************************************************************************/
-
-u8 *
-acpi_tb_scan_memory_for_rsdp (
- u8 *start_address,
- u32 length)
+static u8 *acpi_tb_scan_memory_for_rsdp(u8 * start_address, u32 length)
{
- u32 offset;
- u8 *mem_rover;
+ acpi_status status;
+ u8 *mem_rover;
+ u8 *end_address;
+ ACPI_FUNCTION_TRACE(tb_scan_memory_for_rsdp);
- ACPI_FUNCTION_TRACE ("tb_scan_memory_for_rsdp");
+ end_address = start_address + length;
+ /* Search from given start address for the requested length */
- /* Search from given start addr for the requested length */
+ for (mem_rover = start_address; mem_rover < end_address;
+ mem_rover += ACPI_RSDP_SCAN_STEP) {
- for (offset = 0, mem_rover = start_address;
- offset < length;
- offset += ACPI_RSDP_SCAN_STEP, mem_rover += ACPI_RSDP_SCAN_STEP) {
+ /* The RSDP signature and checksum must both be correct */
- /* The signature and checksum must both be correct */
+ status =
+ acpi_tb_validate_rsdp(ACPI_CAST_PTR
+ (struct rsdp_descriptor, mem_rover));
+ if (ACPI_SUCCESS(status)) {
- 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 */
+ /* Sig and checksum valid, we have found a real RSDP */
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
- "RSDP located at physical address %p\n",mem_rover));
- return_PTR (mem_rover);
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "RSDP located at physical address %p\n",
+ mem_rover));
+ return_PTR(mem_rover);
}
+
+ /* No sig match or bad checksum, keep searching */
}
/* Searched entire block, no RSDP was found */
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO,"Searched entire block, no RSDP was found.\n"));
- return_PTR (NULL);
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Searched entire block from %p, valid RSDP was not found\n",
+ start_address));
+ return_PTR(NULL);
}
-
/*******************************************************************************
*
* FUNCTION: acpi_tb_find_rsdp
*
- * PARAMETERS: *table_info - Where the table info is returned
+ * PARAMETERS: table_info - Where the table info is returned
* Flags - Current memory mode (logical vs.
* physical addressing)
*
- * RETURN: Status
+ * RETURN: Status, RSDP physical address
*
- * DESCRIPTION: search lower 1_mbyte of memory for the root system descriptor
+ * DESCRIPTION: Search lower 1_mbyte of memory for the root system descriptor
* pointer structure. If it is found, set *RSDP to point to it.
*
- * NOTE: The RSDp must be either in the first 1_k of the Extended
- * BIOS Data Area or between E0000 and FFFFF (ACPI 1.0 section
- * 5.2.2; assertion #421).
+ * NOTE1: The RSDP must be either in the first 1_k of the Extended
+ * BIOS Data Area or between E0000 and FFFFF (From ACPI Spec.)
+ * Only a 32-bit physical address is necessary.
+ *
+ * NOTE2: This function is always available, regardless of the
+ * initialization state of the rest of ACPI.
*
******************************************************************************/
-acpi_status
-acpi_tb_find_rsdp (
- struct acpi_table_desc *table_info,
- u32 flags)
+static acpi_status
+acpi_tb_find_rsdp(struct acpi_table_desc *table_info, u32 flags)
{
- u8 *table_ptr;
- u8 *mem_rover;
- u64 phys_addr;
- acpi_status status = AE_OK;
-
-
- ACPI_FUNCTION_TRACE ("tb_find_rsdp");
+ u8 *table_ptr;
+ u8 *mem_rover;
+ u32 physical_address;
+ acpi_status status;
+ ACPI_FUNCTION_TRACE(tb_find_rsdp);
/*
- * Scan supports either 1) Logical addressing or 2) Physical addressing
+ * Scan supports either logical addressing or physical addressing
*/
if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) {
- /*
- * 1) Search EBDA (low memory) paragraphs
- */
- status = acpi_os_map_memory ((u64) ACPI_LO_RSDP_WINDOW_BASE, ACPI_LO_RSDP_WINDOW_SIZE,
- (void *) &table_ptr);
- if (ACPI_FAILURE (status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not map memory at %X for length %X\n",
- ACPI_LO_RSDP_WINDOW_BASE, ACPI_LO_RSDP_WINDOW_SIZE));
- return_ACPI_STATUS (status);
+
+ /* 1a) Get the location of the Extended BIOS Data Area (EBDA) */
+
+ status = acpi_os_map_memory((acpi_physical_address)
+ ACPI_EBDA_PTR_LOCATION,
+ ACPI_EBDA_PTR_LENGTH,
+ (void *)&table_ptr);
+ if (ACPI_FAILURE(status)) {
+ ACPI_ERROR((AE_INFO,
+ "Could not map memory at %8.8X for length %X",
+ ACPI_EBDA_PTR_LOCATION,
+ ACPI_EBDA_PTR_LENGTH));
+
+ return_ACPI_STATUS(status);
}
- mem_rover = acpi_tb_scan_memory_for_rsdp (table_ptr, ACPI_LO_RSDP_WINDOW_SIZE);
- acpi_os_unmap_memory (table_ptr, ACPI_LO_RSDP_WINDOW_SIZE);
+ ACPI_MOVE_16_TO_32(&physical_address, table_ptr);
- if (mem_rover) {
- /* Found it, return the physical address */
+ /* Convert segment part to physical address */
- phys_addr = ACPI_LO_RSDP_WINDOW_BASE;
- phys_addr += ACPI_PTR_DIFF (mem_rover,table_ptr);
+ physical_address <<= 4;
+ acpi_os_unmap_memory(table_ptr, ACPI_EBDA_PTR_LENGTH);
+
+ /* EBDA present? */
+
+ if (physical_address > 0x400) {
+ /*
+ * 1b) Search EBDA paragraphs (EBDA is required to be a
+ * minimum of 1_k length)
+ */
+ status = acpi_os_map_memory((acpi_physical_address)
+ physical_address,
+ ACPI_EBDA_WINDOW_SIZE,
+ (void *)&table_ptr);
+ if (ACPI_FAILURE(status)) {
+ ACPI_ERROR((AE_INFO,
+ "Could not map memory at %8.8X for length %X",
+ physical_address,
+ ACPI_EBDA_WINDOW_SIZE));
+
+ return_ACPI_STATUS(status);
+ }
- table_info->physical_address = phys_addr;
- return_ACPI_STATUS (AE_OK);
+ mem_rover = acpi_tb_scan_memory_for_rsdp(table_ptr,
+ ACPI_EBDA_WINDOW_SIZE);
+ acpi_os_unmap_memory(table_ptr, ACPI_EBDA_WINDOW_SIZE);
+
+ if (mem_rover) {
+
+ /* Return the physical address */
+
+ physical_address +=
+ (u32) ACPI_PTR_DIFF(mem_rover, table_ptr);
+
+ table_info->physical_address =
+ (acpi_physical_address) physical_address;
+ return_ACPI_STATUS(AE_OK);
+ }
}
/*
- * 2) Search upper memory: 16-byte boundaries in E0000h-F0000h
+ * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh
*/
- status = acpi_os_map_memory ((u64) ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE,
- (void *) &table_ptr);
- if (ACPI_FAILURE (status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not map memory at %X for length %X\n",
- ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE));
- return_ACPI_STATUS (status);
+ status = acpi_os_map_memory((acpi_physical_address)
+ ACPI_HI_RSDP_WINDOW_BASE,
+ ACPI_HI_RSDP_WINDOW_SIZE,
+ (void *)&table_ptr);
+
+ if (ACPI_FAILURE(status)) {
+ ACPI_ERROR((AE_INFO,
+ "Could not map memory at %8.8X for length %X",
+ ACPI_HI_RSDP_WINDOW_BASE,
+ ACPI_HI_RSDP_WINDOW_SIZE));
+
+ return_ACPI_STATUS(status);
}
- mem_rover = acpi_tb_scan_memory_for_rsdp (table_ptr, ACPI_HI_RSDP_WINDOW_SIZE);
- acpi_os_unmap_memory (table_ptr, ACPI_HI_RSDP_WINDOW_SIZE);
+ mem_rover =
+ acpi_tb_scan_memory_for_rsdp(table_ptr,
+ ACPI_HI_RSDP_WINDOW_SIZE);
+ acpi_os_unmap_memory(table_ptr, ACPI_HI_RSDP_WINDOW_SIZE);
if (mem_rover) {
- /* Found it, return the physical address */
- phys_addr = ACPI_HI_RSDP_WINDOW_BASE;
- phys_addr += ACPI_PTR_DIFF (mem_rover, table_ptr);
+ /* Return the physical address */
+
+ physical_address = (u32)
+ (ACPI_HI_RSDP_WINDOW_BASE +
+ ACPI_PTR_DIFF(mem_rover, table_ptr));
- table_info->physical_address = phys_addr;
- return_ACPI_STATUS (AE_OK);
+ table_info->physical_address =
+ (acpi_physical_address) physical_address;
+ return_ACPI_STATUS(AE_OK);
}
}
* Physical addressing
*/
else {
- /*
- * 1) Search EBDA (low memory) paragraphs
- */
- mem_rover = acpi_tb_scan_memory_for_rsdp (ACPI_PHYSADDR_TO_PTR (ACPI_LO_RSDP_WINDOW_BASE),
- ACPI_LO_RSDP_WINDOW_SIZE);
- if (mem_rover) {
- /* Found it, return the physical address */
+ /* 1a) Get the location of the EBDA */
+
+ ACPI_MOVE_16_TO_32(&physical_address, ACPI_EBDA_PTR_LOCATION);
+ physical_address <<= 4; /* Convert segment to physical address */
+
+ /* EBDA present? */
+
+ if (physical_address > 0x400) {
+ /*
+ * 1b) Search EBDA paragraphs (EBDA is required to be a minimum of
+ * 1_k length)
+ */
+ mem_rover =
+ acpi_tb_scan_memory_for_rsdp(ACPI_PHYSADDR_TO_PTR
+ (physical_address),
+ ACPI_EBDA_WINDOW_SIZE);
+ if (mem_rover) {
- table_info->physical_address = ACPI_TO_INTEGER (mem_rover);
- return_ACPI_STATUS (AE_OK);
+ /* Return the physical address */
+
+ table_info->physical_address =
+ ACPI_TO_INTEGER(mem_rover);
+ return_ACPI_STATUS(AE_OK);
+ }
}
- /*
- * 2) Search upper memory: 16-byte boundaries in E0000h-F0000h
- */
- mem_rover = acpi_tb_scan_memory_for_rsdp (ACPI_PHYSADDR_TO_PTR (ACPI_HI_RSDP_WINDOW_BASE),
- ACPI_HI_RSDP_WINDOW_SIZE);
+ /* 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh */
+
+ mem_rover =
+ acpi_tb_scan_memory_for_rsdp(ACPI_PHYSADDR_TO_PTR
+ (ACPI_HI_RSDP_WINDOW_BASE),
+ ACPI_HI_RSDP_WINDOW_SIZE);
if (mem_rover) {
+
/* Found it, return the physical address */
- table_info->physical_address = ACPI_TO_INTEGER (mem_rover);
- return_ACPI_STATUS (AE_OK);
+ table_info->physical_address =
+ ACPI_TO_INTEGER(mem_rover);
+ return_ACPI_STATUS(AE_OK);
}
}
- /* RSDP signature was not found */
+ /* A valid RSDP was not found */
- return_ACPI_STATUS (AE_NOT_FOUND);
+ ACPI_ERROR((AE_INFO, "No valid RSDP was found"));
+ return_ACPI_STATUS(AE_NOT_FOUND);
}
#endif
-
git://git.onelab.eu / linux-2.6.git / blobdiff