ACPI_STATUS
AcpiGetTableHeader (
ACPI_TABLE_TYPE TableType,
UINT32 Instance,
ACPI_TABLE_HEADER *OutTableHeader)
{
ACPI_TABLE_HEADER *TblPtr;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE ("AcpiGetTableHeader");
if ((Instance == 0) ||
(TableType == ACPI_TABLE_RSDP) ||
(!OutTableHeader))
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Check the table type and instance */
if ((TableType > ACPI_TABLE_MAX) ||
(ACPI_IS_SINGLE_TABLE (AcpiGbl_AcpiTableData[TableType].Flags) &&
Instance > 1))
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Get a pointer to the entire table */
Status = AcpiTbGetTablePtr (TableType, Instance, &TblPtr);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/*
* The function will return a NULL pointer if the table is not loaded
*/
if (TblPtr == NULL)
{
return_ACPI_STATUS (AE_NOT_EXIST);
}
/*
* Copy the header to the caller's buffer
*/
ACPI_MEMCPY ((void *) OutTableHeader, (void *) TblPtr,
sizeof (ACPI_TABLE_HEADER));
return_ACPI_STATUS (Status);
}
acpi_status
acpi_get_table_header (
acpi_table_type table_type,
u32 instance,
struct acpi_table_header *out_table_header)
{
struct acpi_table_header *tbl_ptr;
acpi_status status;
ACPI_FUNCTION_TRACE ("acpi_get_table_header");
if ((instance == 0) ||
(table_type == ACPI_TABLE_RSDP) ||
(!out_table_header)) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Check the table type and instance */
if ((table_type > ACPI_TABLE_MAX) ||
(ACPI_IS_SINGLE_TABLE (acpi_gbl_table_data[table_type].flags) &&
instance > 1)) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Get a pointer to the entire table */
status = acpi_tb_get_table_ptr (table_type, instance, &tbl_ptr);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/*
* The function will return a NULL pointer if the table is not loaded
*/
if (tbl_ptr == NULL) {
return_ACPI_STATUS (AE_NOT_EXIST);
}
/*
* Copy the header to the caller's buffer
*/
ACPI_MEMCPY ((void *) out_table_header, (void *) tbl_ptr,
sizeof (struct acpi_table_header));
return_ACPI_STATUS (status);
}
acpi_status
acpi_get_table (
acpi_table_type table_type,
u32 instance,
struct acpi_buffer *ret_buffer)
{
struct acpi_table_header *tbl_ptr;
acpi_status status;
acpi_size table_length;
ACPI_FUNCTION_TRACE ("acpi_get_table");
/* Parameter validation */
if (instance == 0) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
status = acpi_ut_validate_buffer (ret_buffer);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/* Check the table type and instance */
if ((table_type > ACPI_TABLE_MAX) ||
(ACPI_IS_SINGLE_TABLE (acpi_gbl_table_data[table_type].flags) &&
instance > 1)) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Get a pointer to the entire table */
status = acpi_tb_get_table_ptr (table_type, instance, &tbl_ptr);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/*
* acpi_tb_get_table_ptr will return a NULL pointer if the
* table is not loaded.
*/
if (tbl_ptr == NULL) {
return_ACPI_STATUS (AE_NOT_EXIST);
}
/* Get the table length */
if (table_type == ACPI_TABLE_RSDP) {
/*
* RSD PTR is the only "table" without a header
*/
table_length = sizeof (struct rsdp_descriptor);
}
else {
table_length = (acpi_size) tbl_ptr->length;
}
/* Validate/Allocate/Clear caller buffer */
status = acpi_ut_initialize_buffer (ret_buffer, table_length);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/* Copy the table to the buffer */
ACPI_MEMCPY ((void *) ret_buffer->pointer, (void *) tbl_ptr, table_length);
return_ACPI_STATUS (AE_OK);
}
/**ltl
* 功能:将ACPI表的描述符信息插入到全局列表中
* 参数:
* 返回值:
* 说明:表类型table_type分别为:0(RSDP)、6 (XSDT)、2 (FADT)、5 (SSDT)、5 (SSDT)、3 (FACS)、1 (DSDT)
*/
acpi_status
acpi_tb_init_table_descriptor(acpi_table_type table_type,
struct acpi_table_desc *table_info)
{
struct acpi_table_list *list_head;
struct acpi_table_desc *table_desc;
acpi_status status;
ACPI_FUNCTION_TRACE_U32(tb_init_table_descriptor, table_type);
/* Allocate a descriptor for this table */
/* 分配ACPI表描述符信息 */
table_desc = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_table_desc));
if (!table_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Get a new owner ID for the table */
/* 为ACPI表描述符分配ID */
status = acpi_ut_allocate_owner_id(&table_desc->owner_id);
if (ACPI_FAILURE(status)) {
goto error_exit1;
}
/* Install the table into the global data structure */
/* 全局列表 */
list_head = &acpi_gbl_table_lists[table_type];
/*
* Two major types of tables: 1) Only one instance is allowed. This
* includes most ACPI tables such as the DSDT. 2) Multiple instances of
* the table are allowed. This includes SSDT and PSDTs.
*/
/* 如果此ACPI表在系统中只能是唯一一个 */
if (ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags)) {
/*
* Only one table allowed, and a table has alread been installed
* at this location, so return an error.
*/
if (list_head->next) { /* 表示此表已经存在，退出 */
status = AE_ALREADY_EXISTS;
goto error_exit2;
}
/* 将ACPI表描述符对象插入到全局列表中 */
table_desc->next = list_head->next;
list_head->next = table_desc;
if (table_desc->next) {
table_desc->next->prev = table_desc;
}
list_head->count++;
} else {
/*
* Link the new table in to the list of tables of this type.
* Insert at the end of the list, order IS IMPORTANT.
*
* table_desc->Prev & Next are already NULL from calloc()
*/
/* 在系统中引出现多张相同的ACPI表，把它们以链表的形式链接 */
list_head->count++;
if (!list_head->next) {
list_head->next = table_desc;
} else {
table_desc->next = list_head->next;
while (table_desc->next->next) {
table_desc->next = table_desc->next->next;
}
table_desc->next->next = table_desc;
table_desc->prev = table_desc->next;
table_desc->next = NULL;
}
}
/* Finish initialization of the table descriptor */
table_desc->loaded_into_namespace = FALSE;
table_desc->type = (u8) table_type;
table_desc->pointer = table_info->pointer;
table_desc->length = table_info->length;
table_desc->allocation = table_info->allocation;
table_desc->aml_start = (u8 *) (table_desc->pointer + 1),
table_desc->aml_length = (u32)
(table_desc->length - (u32) sizeof(struct acpi_table_header));
/*
* Set the appropriate global pointer (if there is one) to point to the
* newly installed table
*/
/* 将ACPI表的起始地址保存到global_ptr中。在这语句是对全局变量:acpi_gbl_FADT、acpi_gbl_FACS、acpi_gbl_DSDT
* 进行赋值
*/
if (acpi_gbl_table_data[table_type].global_ptr) {
*(acpi_gbl_table_data[table_type].global_ptr) =
table_info->pointer;
}
/* Return Data */
table_info->owner_id = table_desc->owner_id;
table_info->installed_desc = table_desc;
return_ACPI_STATUS(AE_OK);
/* Error exit with cleanup */
error_exit2:
acpi_ut_release_owner_id(&table_desc->owner_id);
error_exit1:
ACPI_FREE(table_desc);
return_ACPI_STATUS(status);
}
ACPI_STATUS
AcpiGetTable (
ACPI_TABLE_TYPE TableType,
UINT32 Instance,
ACPI_BUFFER *RetBuffer)
{
ACPI_TABLE_HEADER *TblPtr;
ACPI_STATUS Status;
ACPI_SIZE TableLength;
ACPI_FUNCTION_TRACE ("AcpiGetTable");
/* Parameter validation */
if (Instance == 0)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
Status = AcpiUtValidateBuffer (RetBuffer);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Check the table type and instance */
if ((TableType > ACPI_TABLE_MAX) ||
(ACPI_IS_SINGLE_TABLE (AcpiGbl_AcpiTableData[TableType].Flags) &&
Instance > 1))
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Get a pointer to the entire table */
Status = AcpiTbGetTablePtr (TableType, Instance, &TblPtr);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/*
* AcpiTbGetTablePtr will return a NULL pointer if the
* table is not loaded.
*/
if (TblPtr == NULL)
{
return_ACPI_STATUS (AE_NOT_EXIST);
}
/* Get the table length */
if (TableType == ACPI_TABLE_RSDP)
{
/*
* RSD PTR is the only "table" without a header
*/
TableLength = sizeof (RSDP_DESCRIPTOR);
}
else
{
TableLength = (ACPI_SIZE) TblPtr->Length;
}
/* Validate/Allocate/Clear caller buffer */
Status = AcpiUtInitializeBuffer (RetBuffer, TableLength);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Copy the table to the buffer */
ACPI_MEMCPY ((void *) RetBuffer->Pointer, (void *) TblPtr, TableLength);
return_ACPI_STATUS (AE_OK);
}
acpi_status
acpi_tb_init_table_descriptor (
acpi_table_type table_type,
struct acpi_table_desc *table_info)
{
struct acpi_table_list *list_head;
struct acpi_table_desc *table_desc;
ACPI_FUNCTION_TRACE_U32 ("tb_init_table_descriptor", table_type);
/* Allocate a descriptor for this table */
table_desc = ACPI_MEM_CALLOCATE (sizeof (struct acpi_table_desc));
if (!table_desc) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
/*
* Install the table into the global data structure
*/
list_head = &acpi_gbl_table_lists[table_type];
/*
* Two major types of tables: 1) Only one instance is allowed. This
* includes most ACPI tables such as the DSDT. 2) Multiple instances of
* the table are allowed. This includes SSDT and PSDTs.
*/
if (ACPI_IS_SINGLE_TABLE (acpi_gbl_table_data[table_type].flags)) {
/*
* Only one table allowed, and a table has alread been installed
* at this location, so return an error.
*/
if (list_head->next) {
ACPI_MEM_FREE (table_desc);
return_ACPI_STATUS (AE_ALREADY_EXISTS);
}
table_desc->next = list_head->next;
list_head->next = table_desc;
if (table_desc->next) {
table_desc->next->prev = table_desc;
}
list_head->count++;
}
else {
/*
* Link the new table in to the list of tables of this type.
* Insert at the end of the list, order IS IMPORTANT.
*
* table_desc->Prev & Next are already NULL from calloc()
*/
list_head->count++;
if (!list_head->next) {
list_head->next = table_desc;
}
else {
table_desc->next = list_head->next;
while (table_desc->next->next) {
table_desc->next = table_desc->next->next;
}
table_desc->next->next = table_desc;
table_desc->prev = table_desc->next;
table_desc->next = NULL;
}
}
/* Finish initialization of the table descriptor */
table_desc->type = (u8) table_type;
table_desc->pointer = table_info->pointer;
table_desc->length = table_info->length;
table_desc->allocation = table_info->allocation;
table_desc->aml_start = (u8 *) (table_desc->pointer + 1),
table_desc->aml_length = (u32) (table_desc->length -
(u32) sizeof (struct acpi_table_header));
table_desc->table_id = acpi_ut_allocate_owner_id (ACPI_OWNER_TYPE_TABLE);
table_desc->loaded_into_namespace = FALSE;
/*
* Set the appropriate global pointer (if there is one) to point to the
* newly installed table
*/
if (acpi_gbl_table_data[table_type].global_ptr) {
*(acpi_gbl_table_data[table_type].global_ptr) = table_info->pointer;
}
/* Return Data */
table_info->table_id = table_desc->table_id;
table_info->installed_desc = table_desc;
return_ACPI_STATUS (AE_OK);
}
ACPI_STATUS
AcpiTbInitTableDescriptor (
ACPI_TABLE_TYPE TableType,
ACPI_TABLE_DESC *TableInfo)
{
ACPI_TABLE_LIST *ListHead;
ACPI_TABLE_DESC *TableDesc;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE_U32 (TbInitTableDescriptor, TableType);
/* Allocate a descriptor for this table */
TableDesc = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_TABLE_DESC));
if (!TableDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Get a new owner ID for the table */
Status = AcpiUtAllocateOwnerId (&TableDesc->OwnerId);
if (ACPI_FAILURE (Status))
{
goto ErrorExit1;
}
/* Install the table into the global data structure */
ListHead = &AcpiGbl_TableLists[TableType];
/*
* Two major types of tables: 1) Only one instance is allowed. This
* includes most ACPI tables such as the DSDT. 2) Multiple instances of
* the table are allowed. This includes SSDT and PSDTs.
*/
if (ACPI_IS_SINGLE_TABLE (AcpiGbl_TableData[TableType].Flags))
{
/*
* Only one table allowed, and a table has alread been installed
* at this location, so return an error.
*/
if (ListHead->Next)
{
Status = AE_ALREADY_EXISTS;
goto ErrorExit2;
}
TableDesc->Next = ListHead->Next;
ListHead->Next = TableDesc;
if (TableDesc->Next)
{
TableDesc->Next->Prev = TableDesc;
}
ListHead->Count++;
}
else
{
/*
* Link the new table in to the list of tables of this type.
* Insert at the end of the list, order IS IMPORTANT.
*
* TableDesc->Prev & Next are already NULL from calloc()
*/
ListHead->Count++;
if (!ListHead->Next)
{
ListHead->Next = TableDesc;
}
else
{
TableDesc->Next = ListHead->Next;
while (TableDesc->Next->Next)
{
TableDesc->Next = TableDesc->Next->Next;
}
TableDesc->Next->Next = TableDesc;
TableDesc->Prev = TableDesc->Next;
TableDesc->Next = NULL;
}
}
/* Finish initialization of the table descriptor */
TableDesc->LoadedIntoNamespace = FALSE;
TableDesc->Type = (UINT8) TableType;
TableDesc->Pointer = TableInfo->Pointer;
TableDesc->Length = TableInfo->Length;
TableDesc->Allocation = TableInfo->Allocation;
TableDesc->AmlStart = (UINT8 *) (TableDesc->Pointer + 1),
TableDesc->AmlLength = (UINT32)
(TableDesc->Length - (UINT32) sizeof (ACPI_TABLE_HEADER));
/*
* Set the appropriate global pointer (if there is one) to point to the
* newly installed table
*/
if (AcpiGbl_TableData[TableType].GlobalPtr)
{
*(AcpiGbl_TableData[TableType].GlobalPtr) = TableInfo->Pointer;
}
/* Return Data */
TableInfo->OwnerId = TableDesc->OwnerId;
TableInfo->InstalledDesc = TableDesc;
return_ACPI_STATUS (AE_OK);
/* Error exit with cleanup */
ErrorExit2:
AcpiUtReleaseOwnerId (&TableDesc->OwnerId);
ErrorExit1:
ACPI_FREE (TableDesc);
return_ACPI_STATUS (Status);
}