v4.19.13 snapshot.
diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
new file mode 100644
index 0000000..b526096
--- /dev/null
+++ b/drivers/acpi/acpica/tbutils.c
@@ -0,0 +1,446 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: tbutils - ACPI Table utilities
+ *
+ * Copyright (C) 2000 - 2018, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "actables.h"
+
+#define _COMPONENT ACPI_TABLES
+ACPI_MODULE_NAME("tbutils")
+
+/* Local prototypes */
+static acpi_physical_address
+acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);
+
+#if (!ACPI_REDUCED_HARDWARE)
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_initialize_facs
+ *
+ * PARAMETERS: None
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
+ * for accessing the Global Lock and Firmware Waking Vector
+ *
+ ******************************************************************************/
+
+acpi_status acpi_tb_initialize_facs(void)
+{
+ struct acpi_table_facs *facs;
+
+ /* If Hardware Reduced flag is set, there is no FACS */
+
+ if (acpi_gbl_reduced_hardware) {
+ acpi_gbl_FACS = NULL;
+ return (AE_OK);
+ } else if (acpi_gbl_FADT.Xfacs &&
+ (!acpi_gbl_FADT.facs
+ || !acpi_gbl_use32_bit_facs_addresses)) {
+ (void)acpi_get_table_by_index(acpi_gbl_xfacs_index,
+ ACPI_CAST_INDIRECT_PTR(struct
+ acpi_table_header,
+ &facs));
+ acpi_gbl_FACS = facs;
+ } else if (acpi_gbl_FADT.facs) {
+ (void)acpi_get_table_by_index(acpi_gbl_facs_index,
+ ACPI_CAST_INDIRECT_PTR(struct
+ acpi_table_header,
+ &facs));
+ acpi_gbl_FACS = facs;
+ }
+
+ /* If there is no FACS, just continue. There was already an error msg */
+
+ return (AE_OK);
+}
+#endif /* !ACPI_REDUCED_HARDWARE */
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_check_dsdt_header
+ *
+ * PARAMETERS: None
+ *
+ * RETURN: None
+ *
+ * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
+ * if the DSDT has been replaced from outside the OS and/or if
+ * the DSDT header has been corrupted.
+ *
+ ******************************************************************************/
+
+void acpi_tb_check_dsdt_header(void)
+{
+
+ /* Compare original length and checksum to current values */
+
+ if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length ||
+ acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) {
+ ACPI_BIOS_ERROR((AE_INFO,
+ "The DSDT has been corrupted or replaced - "
+ "old, new headers below"));
+
+ acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header);
+ acpi_tb_print_table_header(0, acpi_gbl_DSDT);
+
+ ACPI_ERROR((AE_INFO,
+ "Please send DMI info to linux-acpi@vger.kernel.org\n"
+ "If system does not work as expected, please boot with acpi=copy_dsdt"));
+
+ /* Disable further error messages */
+
+ acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length;
+ acpi_gbl_original_dsdt_header.checksum =
+ acpi_gbl_DSDT->checksum;
+ }
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_copy_dsdt
+ *
+ * PARAMETERS: table_index - Index of installed table to copy
+ *
+ * RETURN: The copied DSDT
+ *
+ * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
+ * Some very bad BIOSs are known to either corrupt the DSDT or
+ * install a new, bad DSDT. This copy works around the problem.
+ *
+ ******************************************************************************/
+
+struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index)
+{
+ struct acpi_table_header *new_table;
+ struct acpi_table_desc *table_desc;
+
+ table_desc = &acpi_gbl_root_table_list.tables[table_index];
+
+ new_table = ACPI_ALLOCATE(table_desc->length);
+ if (!new_table) {
+ ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X",
+ table_desc->length));
+ return (NULL);
+ }
+
+ memcpy(new_table, table_desc->pointer, table_desc->length);
+ acpi_tb_uninstall_table(table_desc);
+
+ acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.
+ tables[acpi_gbl_dsdt_index],
+ ACPI_PTR_TO_PHYSADDR(new_table),
+ ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
+ new_table);
+
+ ACPI_INFO(("Forced DSDT copy: length 0x%05X copied locally, original unmapped", new_table->length));
+
+ return (new_table);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_get_root_table_entry
+ *
+ * PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry
+ * table_entry_size - sizeof 32 or 64 (RSDT or XSDT)
+ *
+ * RETURN: Physical address extracted from the root table
+ *
+ * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
+ * both 32-bit and 64-bit platforms
+ *
+ * NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
+ * 64-bit platforms.
+ *
+ ******************************************************************************/
+
+static acpi_physical_address
+acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
+{
+ u64 address64;
+
+ /*
+ * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
+ * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
+ */
+ if (table_entry_size == ACPI_RSDT_ENTRY_SIZE) {
+ /*
+ * 32-bit platform, RSDT: Return 32-bit table entry
+ * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
+ */
+ return ((acpi_physical_address)
+ (*ACPI_CAST_PTR(u32, table_entry)));
+ } else {
+ /*
+ * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
+ * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
+ * return 64-bit
+ */
+ ACPI_MOVE_64_TO_64(&address64, table_entry);
+
+#if ACPI_MACHINE_WIDTH == 32
+ if (address64 > ACPI_UINT32_MAX) {
+
+ /* Will truncate 64-bit address to 32 bits, issue warning */
+
+ ACPI_BIOS_WARNING((AE_INFO,
+ "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
+ " truncating",
+ ACPI_FORMAT_UINT64(address64)));
+ }
+#endif
+ return ((acpi_physical_address)(address64));
+ }
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_parse_root_table
+ *
+ * PARAMETERS: rsdp_address - Pointer to the RSDP
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: This function is called to parse the Root System Description
+ * Table (RSDT or XSDT)
+ *
+ * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
+ * be mapped and cannot be copied because it contains the actual
+ * memory location of the ACPI Global Lock.
+ *
+ ******************************************************************************/
+
+acpi_status ACPI_INIT_FUNCTION
+acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
+{
+ struct acpi_table_rsdp *rsdp;
+ u32 table_entry_size;
+ u32 i;
+ u32 table_count;
+ struct acpi_table_header *table;
+ acpi_physical_address address;
+ u32 length;
+ u8 *table_entry;
+ acpi_status status;
+ u32 table_index;
+
+ ACPI_FUNCTION_TRACE(tb_parse_root_table);
+
+ /* Map the entire RSDP and extract the address of the RSDT or XSDT */
+
+ rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
+ if (!rsdp) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ acpi_tb_print_table_header(rsdp_address,
+ ACPI_CAST_PTR(struct acpi_table_header,
+ rsdp));
+
+ /* Use XSDT if present and not overridden. Otherwise, use RSDT */
+
+ if ((rsdp->revision > 1) &&
+ rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) {
+ /*
+ * RSDP contains an XSDT (64-bit physical addresses). We must use
+ * the XSDT if the revision is > 1 and the XSDT pointer is present,
+ * as per the ACPI specification.
+ */
+ address = (acpi_physical_address)rsdp->xsdt_physical_address;
+ table_entry_size = ACPI_XSDT_ENTRY_SIZE;
+ } else {
+ /* Root table is an RSDT (32-bit physical addresses) */
+
+ address = (acpi_physical_address)rsdp->rsdt_physical_address;
+ table_entry_size = ACPI_RSDT_ENTRY_SIZE;
+ }
+
+ /*
+ * It is not possible to map more than one entry in some environments,
+ * so unmap the RSDP here before mapping other tables
+ */
+ acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
+
+ /* Map the RSDT/XSDT table header to get the full table length */
+
+ table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
+ if (!table) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ acpi_tb_print_table_header(address, table);
+
+ /*
+ * Validate length of the table, and map entire table.
+ * Minimum length table must contain at least one entry.
+ */
+ length = table->length;
+ acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
+
+ if (length < (sizeof(struct acpi_table_header) + table_entry_size)) {
+ ACPI_BIOS_ERROR((AE_INFO,
+ "Invalid table length 0x%X in RSDT/XSDT",
+ length));
+ return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
+ }
+
+ table = acpi_os_map_memory(address, length);
+ if (!table) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ /* Validate the root table checksum */
+
+ status = acpi_tb_verify_checksum(table, length);
+ if (ACPI_FAILURE(status)) {
+ acpi_os_unmap_memory(table, length);
+ return_ACPI_STATUS(status);
+ }
+
+ /* Get the number of entries and pointer to first entry */
+
+ table_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
+ table_entry_size);
+ table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header));
+
+ /* Initialize the root table array from the RSDT/XSDT */
+
+ for (i = 0; i < table_count; i++) {
+
+ /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
+
+ address =
+ acpi_tb_get_root_table_entry(table_entry, table_entry_size);
+
+ /* Skip NULL entries in RSDT/XSDT */
+
+ if (!address) {
+ goto next_table;
+ }
+
+ status = acpi_tb_install_standard_table(address,
+ ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
+ FALSE, TRUE,
+ &table_index);
+
+ if (ACPI_SUCCESS(status) &&
+ ACPI_COMPARE_NAME(&acpi_gbl_root_table_list.
+ tables[table_index].signature,
+ ACPI_SIG_FADT)) {
+ acpi_gbl_fadt_index = table_index;
+ acpi_tb_parse_fadt();
+ }
+
+next_table:
+
+ table_entry += table_entry_size;
+ }
+
+ acpi_os_unmap_memory(table, length);
+ return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_get_table
+ *
+ * PARAMETERS: table_desc - Table descriptor
+ * out_table - Where the pointer to the table is returned
+ *
+ * RETURN: Status and pointer to the requested table
+ *
+ * DESCRIPTION: Increase a reference to a table descriptor and return the
+ * validated table pointer.
+ * If the table descriptor is an entry of the root table list,
+ * this API must be invoked with ACPI_MTX_TABLES acquired.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_get_table(struct acpi_table_desc *table_desc,
+ struct acpi_table_header **out_table)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(acpi_tb_get_table);
+
+ if (table_desc->validation_count == 0) {
+
+ /* Table need to be "VALIDATED" */
+
+ status = acpi_tb_validate_table(table_desc);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+ }
+
+ if (table_desc->validation_count < ACPI_MAX_TABLE_VALIDATIONS) {
+ table_desc->validation_count++;
+
+ /*
+ * Detect validation_count overflows to ensure that the warning
+ * message will only be printed once.
+ */
+ if (table_desc->validation_count >= ACPI_MAX_TABLE_VALIDATIONS) {
+ ACPI_WARNING((AE_INFO,
+ "Table %p, Validation count overflows\n",
+ table_desc));
+ }
+ }
+
+ *out_table = table_desc->pointer;
+ return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_put_table
+ *
+ * PARAMETERS: table_desc - Table descriptor
+ *
+ * RETURN: None
+ *
+ * DESCRIPTION: Decrease a reference to a table descriptor and release the
+ * validated table pointer if no references.
+ * If the table descriptor is an entry of the root table list,
+ * this API must be invoked with ACPI_MTX_TABLES acquired.
+ *
+ ******************************************************************************/
+
+void acpi_tb_put_table(struct acpi_table_desc *table_desc)
+{
+
+ ACPI_FUNCTION_TRACE(acpi_tb_put_table);
+
+ if (table_desc->validation_count < ACPI_MAX_TABLE_VALIDATIONS) {
+ table_desc->validation_count--;
+
+ /*
+ * Detect validation_count underflows to ensure that the warning
+ * message will only be printed once.
+ */
+ if (table_desc->validation_count >= ACPI_MAX_TABLE_VALIDATIONS) {
+ ACPI_WARNING((AE_INFO,
+ "Table %p, Validation count underflows\n",
+ table_desc));
+ return_VOID;
+ }
+ }
+
+ if (table_desc->validation_count == 0) {
+
+ /* Table need to be "INVALIDATED" */
+
+ acpi_tb_invalidate_table(table_desc);
+ }
+
+ return_VOID;
+}