diff options
Diffstat (limited to 'drivers/acpi/acpica/tbutils.c')
| -rw-r--r-- | drivers/acpi/acpica/tbutils.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c index f47a70e20063..07bc7437f82b 100644 --- a/drivers/acpi/acpica/tbutils.c +++ b/drivers/acpi/acpica/tbutils.c @@ -349,6 +349,44 @@ u8 acpi_tb_checksum(u8 *buffer, u32 length) /******************************************************************************* * + * 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->pointer->length + || acpi_gbl_original_dsdt_header.checksum != + acpi_gbl_DSDT->pointer->checksum) { + ACPI_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(acpi_gbl_DSDT->address, + acpi_gbl_DSDT->pointer); + + /* Disable further error messages */ + + acpi_gbl_original_dsdt_header.length = + acpi_gbl_DSDT->pointer->length; + acpi_gbl_original_dsdt_header.checksum = + acpi_gbl_DSDT->pointer->checksum; + } +} + +/******************************************************************************* + * * FUNCTION: acpi_tb_install_table * * PARAMETERS: Address - Physical address of DSDT or FACS |