1 files changed, 72 insertions, 34 deletions

diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index 22ce48985720..ef7d2c2d8f0b 100644
--- a/drivers/acpi/acpica/tbutils.c
+++ b/drivers/acpi/acpica/tbutils.c
@@ -177,19 +177,23 @@ acpi_tb_print_table_header(acpi_physical_address address,
                            struct acpi_table_header *header)
 {
 
+        /*
+         * The reason that the Address is cast to a void pointer is so that we
+         * can use %p which will work properly on both 32-bit and 64-bit hosts.
+         */
         if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) {
 
-                /* FACS only has signature and length fields of common table header */
+                /* FACS only has signature and length fields */
 
-                ACPI_INFO((AE_INFO, "%4.4s %08lX, %04X",
-                           header->signature, (unsigned long)address,
+                ACPI_INFO((AE_INFO, "%4.4s %p %05X",
+                           header->signature, ACPI_CAST_PTR(void, address),
                            header->length));
         } else if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_RSDP)) {
 
                 /* RSDP has no common fields */
 
-                ACPI_INFO((AE_INFO, "RSDP %08lX, %04X (r%d %6.6s)",
-                           (unsigned long)address,
+                ACPI_INFO((AE_INFO, "RSDP %p %05X (v%.2d %6.6s)",
+                           ACPI_CAST_PTR (void, address),
                            (ACPI_CAST_PTR(struct acpi_table_rsdp, header)->
                             revision >
                             0) ? ACPI_CAST_PTR(struct acpi_table_rsdp,
@@ -202,8 +206,8 @@ acpi_tb_print_table_header(acpi_physical_address address,
                 /* Standard ACPI table with full common header */
 
                 ACPI_INFO((AE_INFO,
-                           "%4.4s %08lX, %04X (r%d %6.6s %8.8s %8X %4.4s %8X)",
-                           header->signature, (unsigned long)address,
+                           "%4.4s %p %05X (v%.2d %6.6s %8.8s %08X %4.4s %08X)",
+                           header->signature, ACPI_CAST_PTR (void, address),
                            header->length, header->revision, header->oem_id,
                            header->oem_table_id, header->oem_revision,
                            header->asl_compiler_id,
@@ -280,22 +284,28 @@ u8 acpi_tb_checksum(u8 *buffer, u32 length)
  * FUNCTION:    acpi_tb_install_table
  *
  * PARAMETERS:  Address                 - Physical address of DSDT or FACS
- *              Flags                   - Flags
  *              Signature               - Table signature, NULL if no need to
  *                                        match
  *              table_index             - Index into root table array
  *
  * RETURN:      None
  *
- * DESCRIPTION: Install an ACPI table into the global data structure.
+ * DESCRIPTION: Install an ACPI table into the global data structure. The
+ *              table override mechanism is implemented here to allow the host
+ *              OS to replace any table before it is installed in the root
+ *              table array.
  *
  ******************************************************************************/
 
 void
 acpi_tb_install_table(acpi_physical_address address,
-                      u8 flags, char *signature, u32 table_index)
+                      char *signature, u32 table_index)
 {
-        struct acpi_table_header *table;
+        u8 flags;
+        acpi_status status;
+        struct acpi_table_header *table_to_install;
+        struct acpi_table_header *mapped_table;
+        struct acpi_table_header *override_table = NULL;
 
         if (!address) {
                 ACPI_ERROR((AE_INFO,
@@ -306,41 +316,69 @@ acpi_tb_install_table(acpi_physical_address address,
 
         /* Map just the table header */
 
-        table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
-        if (!table) {
+        mapped_table =
+            acpi_os_map_memory(address, sizeof(struct acpi_table_header));
+        if (!mapped_table) {
                 return;
         }
 
-        /* If a particular signature is expected, signature must match */
+        /* If a particular signature is expected (DSDT/FACS), it must match */
 
-        if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) {
+        if (signature && !ACPI_COMPARE_NAME(mapped_table->signature, signature)) {
                 ACPI_ERROR((AE_INFO,
-                            "Invalid signature 0x%X for ACPI table [%s]",
-                            *ACPI_CAST_PTR(u32, table->signature), signature));
+                            "Invalid signature 0x%X for ACPI table, expected [%s]",
+                            *ACPI_CAST_PTR(u32, mapped_table->signature),
+                            signature));
                 goto unmap_and_exit;
         }
 
+        /*
+         * ACPI Table Override:
+         *
+         * Before we install the table, let the host OS override it with a new
+         * one if desired. Any table within the RSDT/XSDT can be replaced,
+         * including the DSDT which is pointed to by the FADT.
+         */
+        status = acpi_os_table_override(mapped_table, &override_table);
+        if (ACPI_SUCCESS(status) && override_table) {
+                ACPI_INFO((AE_INFO,
+                           "%4.4s @ 0x%p Table override, replaced with:",
+                           mapped_table->signature, ACPI_CAST_PTR(void,
+                                                                  address)));
+
+                acpi_gbl_root_table_list.tables[table_index].pointer =
+                    override_table;
+                address = ACPI_PTR_TO_PHYSADDR(override_table);
+
+                table_to_install = override_table;
+                flags = ACPI_TABLE_ORIGIN_OVERRIDE;
+        } else {
+                table_to_install = mapped_table;
+                flags = ACPI_TABLE_ORIGIN_MAPPED;
+        }
+
         /* Initialize the table entry */
 
         acpi_gbl_root_table_list.tables[table_index].address = address;
-        acpi_gbl_root_table_list.tables[table_index].length = table->length;
+        acpi_gbl_root_table_list.tables[table_index].length =
+            table_to_install->length;
         acpi_gbl_root_table_list.tables[table_index].flags = flags;
 
         ACPI_MOVE_32_TO_32(&
                            (acpi_gbl_root_table_list.tables[table_index].
-                            signature), table->signature);
+                            signature), table_to_install->signature);
 
-        acpi_tb_print_table_header(address, table);
+        acpi_tb_print_table_header(address, table_to_install);
 
         if (table_index == ACPI_TABLE_INDEX_DSDT) {
 
                 /* Global integer width is based upon revision of the DSDT */
 
-                acpi_ut_set_integer_width(table->revision);
+                acpi_ut_set_integer_width(table_to_install->revision);
         }
 
       unmap_and_exit:
-        acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
+        acpi_os_unmap_memory(mapped_table, sizeof(struct acpi_table_header));
 }
 
 /*******************************************************************************
@@ -379,7 +417,8 @@ acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
         } 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
+                 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
+                 *  return 64-bit
                  */
                 ACPI_MOVE_64_TO_64(&address64, table_entry);
 
@@ -389,7 +428,8 @@ acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
                         /* Will truncate 64-bit address to 32 bits, issue warning */
 
                         ACPI_WARNING((AE_INFO,
-                                      "64-bit Physical Address in XSDT is too large (%8.8X%8.8X), truncating",
+                                      "64-bit Physical Address in XSDT is too large (%8.8X%8.8X),"
+                                      " truncating",
                                       ACPI_FORMAT_UINT64(address64)));
                 }
 #endif
@@ -402,7 +442,6 @@ acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
  * FUNCTION:    acpi_tb_parse_root_table
  *
  * PARAMETERS:  Rsdp                    - Pointer to the RSDP
- *              Flags                   - Flags
  *
  * RETURN:      Status
  *
@@ -416,7 +455,7 @@ acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
  ******************************************************************************/
 
 acpi_status __init
-acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags)
+acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
 {
         struct acpi_table_rsdp *rsdp;
         u32 table_entry_size;
@@ -513,13 +552,12 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags)
 
         /* Calculate the number of tables described in the root table */
 
-        table_count =
-            (u32) ((table->length -
-                    sizeof(struct acpi_table_header)) / table_entry_size);
-
+        table_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
+                            table_entry_size);
         /*
-         * First two entries in the table array are reserved for the DSDT and FACS,
-         * which are not actually present in the RSDT/XSDT - they come from the FADT
+         * First two entries in the table array are reserved for the DSDT
+         * and FACS, which are not actually present in the RSDT/XSDT - they
+         * come from the FADT
          */
         table_entry =
             ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
@@ -567,14 +605,14 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags)
          */
         for (i = 2; i < acpi_gbl_root_table_list.count; i++) {
                 acpi_tb_install_table(acpi_gbl_root_table_list.tables[i].
-                                      address, flags, NULL, i);
+                                      address, NULL, i);
 
                 /* Special case for FADT - get the DSDT and FACS */
 
                 if (ACPI_COMPARE_NAME
                     (&acpi_gbl_root_table_list.tables[i].signature,
                      ACPI_SIG_FADT)) {
-                        acpi_tb_parse_fadt(i, flags);
+                        acpi_tb_parse_fadt(i);
                 }
         }