static acpi_status
acpi_tb_table_override (
struct acpi_table_header *header,
struct acpi_table_desc *table_info)
{
struct acpi_table_header *new_table;
acpi_status status;
struct acpi_pointer address;
ACPI_FUNCTION_TRACE ("tb_table_override");
/*
* The OSL will examine the header and decide whether to override this
* table. If it decides to override, a table will be returned in new_table,
* which we will then copy.
*/
status = acpi_os_table_override (header, &new_table);
if (ACPI_FAILURE (status)) {
/* Some severe error from the OSL, but we basically ignore it */
ACPI_REPORT_ERROR (("Could not override ACPI table, %s\n",
acpi_format_exception (status)));
return_ACPI_STATUS (status);
}
if (!new_table) {
/* No table override */
return_ACPI_STATUS (AE_NO_ACPI_TABLES);
}
/*
* We have a new table to override the old one. Get a copy of
* the new one. We know that the new table has a logical pointer.
*/
address.pointer_type = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
address.pointer.logical = new_table;
status = acpi_tb_get_this_table (&address, new_table, table_info);
if (ACPI_FAILURE (status)) {
ACPI_REPORT_ERROR (("Could not copy override ACPI table, %s\n",
acpi_format_exception (status)));
return_ACPI_STATUS (status);
}
/* Copy the table info */
ACPI_REPORT_INFO (("Table [%4.4s] replaced by host OS\n",
table_info->pointer->signature));
return_ACPI_STATUS (AE_OK);
}
acpi_status
acpi_ev_gpe_initialize (void)
{
u32 register_count0 = 0;
u32 register_count1 = 0;
u32 gpe_number_max = 0;
acpi_handle gpe_device;
acpi_status status;
ACPI_FUNCTION_TRACE ("ev_gpe_initialize");
/* Get a handle to the predefined _GPE object */
status = acpi_get_handle (NULL, "\\_GPE", &gpe_device);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/*
* Initialize the GPE Blocks defined in the FADT
*
* Why the GPE register block lengths are divided by 2: From the ACPI Spec,
* section "General-Purpose Event Registers", we have:
*
* "Each register block contains two registers of equal length
* GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
* GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
* The length of the GPE1_STS and GPE1_EN registers is equal to
* half the GPE1_LEN. If a generic register block is not supported
* then its respective block pointer and block length values in the
* FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
* to be the same size."
*/
/*
* Determine the maximum GPE number for this machine.
*
* Note: both GPE0 and GPE1 are optional, and either can exist without
* the other.
*
* If EITHER the register length OR the block address are zero, then that
* particular block is not supported.
*/
if (acpi_gbl_FADT->gpe0_blk_len &&
acpi_gbl_FADT->xgpe0_blk.address) {
/* GPE block 0 exists (has both length and address > 0) */
register_count0 = (u16) (acpi_gbl_FADT->gpe0_blk_len / 2);
gpe_number_max = (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
/* Install GPE Block 0 */
status = acpi_ev_create_gpe_block (gpe_device, &acpi_gbl_FADT->xgpe0_blk,
register_count0, 0, acpi_gbl_FADT->sci_int, &acpi_gbl_gpe_fadt_blocks[0]);
if (ACPI_FAILURE (status)) {
ACPI_REPORT_ERROR ((
"Could not create GPE Block 0, %s\n",
acpi_format_exception (status)));
}
}
if (acpi_gbl_FADT->gpe1_blk_len &&
acpi_gbl_FADT->xgpe1_blk.address) {
/* GPE block 1 exists (has both length and address > 0) */
register_count1 = (u16) (acpi_gbl_FADT->gpe1_blk_len / 2);
/* Check for GPE0/GPE1 overlap (if both banks exist) */
if ((register_count0) &&
(gpe_number_max >= acpi_gbl_FADT->gpe1_base)) {
ACPI_REPORT_ERROR ((
"GPE0 block (GPE 0 to %d) overlaps the GPE1 block (GPE %d to %d) - Ignoring GPE1\n",
gpe_number_max, acpi_gbl_FADT->gpe1_base,
acpi_gbl_FADT->gpe1_base +
((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1)));
/* Ignore GPE1 block by setting the register count to zero */
register_count1 = 0;
}
else {
/* Install GPE Block 1 */
status = acpi_ev_create_gpe_block (gpe_device, &acpi_gbl_FADT->xgpe1_blk,
register_count1, acpi_gbl_FADT->gpe1_base,
acpi_gbl_FADT->sci_int, &acpi_gbl_gpe_fadt_blocks[1]);
if (ACPI_FAILURE (status)) {
ACPI_REPORT_ERROR ((
"Could not create GPE Block 1, %s\n",
acpi_format_exception (status)));
}
/*
* GPE0 and GPE1 do not have to be contiguous in the GPE number
* space. However, GPE0 always starts at GPE number zero.
*/
gpe_number_max = acpi_gbl_FADT->gpe1_base +
((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
}
}
/* Exit if there are no GPE registers */
if ((register_count0 + register_count1) == 0) {
/* GPEs are not required by ACPI, this is OK */
ACPI_REPORT_INFO (("There are no GPE blocks defined in the FADT\n"));
return_ACPI_STATUS (AE_OK);
}
/* Check for Max GPE number out-of-range */
if (gpe_number_max > ACPI_GPE_MAX) {
ACPI_REPORT_ERROR (("Maximum GPE number from FADT is too large: 0x%X\n",
gpe_number_max));
return_ACPI_STATUS (AE_BAD_VALUE);
}
return_ACPI_STATUS (AE_OK);
}