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authorLen Brown <len.brown@intel.com>2007-11-23 20:08:02 -0500
committerLen Brown <len.brown@intel.com>2007-12-14 02:36:24 -0500
commit239665a3bb0a2234980f918913add31bc536cfd1 (patch)
tree260262706ce5223bf3d1cec0e8083ea42260f2fb /arch/x86/kernel/acpi
parent2ffbb8377c7a0713baf6644e285adc27a5654582 (diff)
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>
Diffstat (limited to 'arch/x86/kernel/acpi')
-rw-r--r--arch/x86/kernel/acpi/boot.c40
1 files changed, 0 insertions, 40 deletions
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 0ca27c7b0e8..719c74b0141 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