diff options
| author | Len Brown <len.brown@intel.com> | 2007-11-23 20:08:02 -0500 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-12-14 02:36:24 -0500 |
| commit | 239665a3bb0a2234980f918913add31bc536cfd1 (patch) | |
| tree | 260262706ce5223bf3d1cec0e8083ea42260f2fb /arch/ia64/kernel/acpi.c | |
| parent | 2ffbb8377c7a0713baf6644e285adc27a5654582 (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/ia64/kernel/acpi.c')
| -rw-r--r-- | arch/ia64/kernel/acpi.c | 26 |
1 files changed, 14 insertions, 12 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) { |