ACPI: tables: complete searching upon RSDP w/ bad checksum.

ACPI tables follow a tree structure in memory.
The root of the tree is the RSDP (Root System Description Pointer).

To find the RSDP, the OS searches for the signature "RSD PTR "
in well known physical memory locations.  Then the OS computes
a table checksum to verify that the signature is really part
of a valid table header.

Some systems have a proper signature but an invalid checksum;
followed elsewhere by a proper signature with valid checksum.

http://bugzilla.kernel.org/show_bug.cgi?id=9444

The Linux RSDP scanning code bailed out on those systems
and as a result they booted with ACPI disabled.

Fix this by deleting the Linux RSDP scanning code and
plugging in the ACPICA RSDP scanning code.

Signed-off-by: Len Brown <len.brown@intel.com>

7 files changed, 23 insertions, 60 deletions

diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 897e2083a3b1..63d6dcdc2e2a 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -69,6 +69,20 @@ unsigned int acpi_cpei_phys_cpuid;
 
 unsigned long acpi_wakeup_address = 0;
 
+#ifdef CONFIG_IA64_GENERIC
+static unsigned long __init acpi_find_rsdp(void)
+{
+        unsigned long rsdp_phys = 0;
+
+        if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
+                rsdp_phys = efi.acpi20;
+        else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
+                printk(KERN_WARNING PREFIX
+                       "v1.0/r0.71 tables no longer supported\n");
+        return rsdp_phys;
+}
+#endif
+
 const char __init *
 acpi_get_sysname(void)
 {
@@ -631,18 +645,6 @@ static int __init acpi_parse_fadt(struct acpi_table_header *table)
         return 0;
 }
 
-unsigned long __init acpi_find_rsdp(void)
-{
-        unsigned long rsdp_phys = 0;
-
-        if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
-                rsdp_phys = efi.acpi20;
-        else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
-                printk(KERN_WARNING PREFIX
-                       "v1.0/r0.71 tables no longer supported\n");
-        return rsdp_phys;
-}
-
 int __init acpi_boot_init(void)
 {
 
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 0ca27c7b0e8d..719c74b0141a 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -581,25 +581,6 @@ int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 
 EXPORT_SYMBOL(acpi_unregister_ioapic);
 
-static unsigned long __init
-acpi_scan_rsdp(unsigned long start, unsigned long length)
-{
-        unsigned long offset = 0;
-        unsigned long sig_len = sizeof("RSD PTR ") - 1;
-
-        /*
-         * Scan all 16-byte boundaries of the physical memory region for the
-         * RSDP signature.
-         */
-        for (offset = 0; offset < length; offset += 16) {
-                if (strncmp((char *)(phys_to_virt(start) + offset), "RSD PTR ", sig_len))
-                        continue;
-                return (start + offset);
-        }
-
-        return 0;
-}
-
 static int __init acpi_parse_sbf(struct acpi_table_header *table)
 {
         struct acpi_table_boot *sb;
@@ -742,27 +723,6 @@ static int __init acpi_parse_fadt(struct acpi_table_header *table)
         return 0;
 }
 
-unsigned long __init acpi_find_rsdp(void)
-{
-        unsigned long rsdp_phys = 0;
-
-        if (efi_enabled) {
-                if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
-                        return efi.acpi20;
-                else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
-                        return efi.acpi;
-        }
-        /*
-         * Scan memory looking for the RSDP signature. First search EBDA (low
-         * memory) paragraphs and then search upper memory (E0000-FFFFF).
-         */
-        rsdp_phys = acpi_scan_rsdp(0, 0x400);
-        if (!rsdp_phys)
-                rsdp_phys = acpi_scan_rsdp(0xE0000, 0x20000);
-
-        return rsdp_phys;
-}
-
 #ifdef  CONFIG_X86_LOCAL_APIC
 /*
  * Parse LAPIC entries in MADT
diff --git a/arch/x86/kernel/srat_32.c b/arch/x86/kernel/srat_32.c
index 2a8713ec0f9a..b3b2c95f19d3 100644
--- a/arch/x86/kernel/srat_32.c
+++ b/arch/x86/kernel/srat_32.c
@@ -276,7 +276,7 @@ int __init get_memcfg_from_srat(void)
         int tables = 0;
         int i = 0;
 
-        rsdp_address = acpi_find_rsdp();
+        rsdp_address = acpi_os_get_root_pointer();
         if (!rsdp_address) {
                 printk("%s: System description tables not found\n",
                        __FUNCTION__);
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index aabc6ca4a81c..101691ef66cb 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -207,8 +207,12 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
                                "System description tables not found\n");
                         return 0;
                 }
-        } else
-                return acpi_find_rsdp();
+        } else {
+                acpi_physical_address pa = 0;
+
+                acpi_find_root_pointer(&pa);
+                return pa;
+        }
 }
 
 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
diff --git a/drivers/acpi/tables/Makefile b/drivers/acpi/tables/Makefile
index 0a7d7afac255..7385efa61622 100644
--- a/drivers/acpi/tables/Makefile
+++ b/drivers/acpi/tables/Makefile
@@ -2,6 +2,6 @@
 # Makefile for all Linux ACPI interpreter subdirectories
 #
 
-obj-y := tbxface.o tbinstal.o  tbutils.o tbfind.o tbfadt.o
+obj-y := tbxface.o tbinstal.o tbutils.o tbfind.o tbfadt.o tbxfroot.o
 
 EXTRA_CFLAGS += $(ACPI_CFLAGS)
diff --git a/drivers/acpi/tables/tbxfroot.c b/drivers/acpi/tables/tbxfroot.c
index cf8fa514189f..9ecb4b6c1e7d 100644
--- a/drivers/acpi/tables/tbxfroot.c
+++ b/drivers/acpi/tables/tbxfroot.c
@@ -100,7 +100,7 @@ static acpi_status acpi_tb_validate_rsdp(struct acpi_table_rsdp *rsdp)
 
 /*******************************************************************************
  *
- * FUNCTION:    acpi_tb_find_rsdp
+ * FUNCTION:    acpi_find_root_pointer
  *
  * PARAMETERS:  table_address           - Where the table pointer is returned
  *
@@ -219,8 +219,6 @@ acpi_status acpi_find_root_pointer(acpi_native_uint * table_address)
         return_ACPI_STATUS(AE_NOT_FOUND);
 }
 
-ACPI_EXPORT_SYMBOL(acpi_find_root_pointer)
-
 /*******************************************************************************
  *
  * FUNCTION:    acpi_tb_scan_memory_for_rsdp
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 8ccedf7a0a5a..8deb61171558 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -79,7 +79,6 @@ typedef int (*acpi_table_handler) (struct acpi_table_header *table);
 typedef int (*acpi_table_entry_handler) (struct acpi_subtable_header *header, const unsigned long end);
 
 char * __acpi_map_table (unsigned long phys_addr, unsigned long size);
-unsigned long acpi_find_rsdp (void);
 int acpi_boot_init (void);
 int acpi_boot_table_init (void);
 int acpi_numa_init (void);