diff options
Diffstat (limited to 'drivers/acpi/tables/tbget.c')
| -rw-r--r-- | drivers/acpi/tables/tbget.c | 303 |
1 files changed, 292 insertions, 11 deletions
diff --git a/drivers/acpi/tables/tbget.c b/drivers/acpi/tables/tbget.c index 19a8f0a2a..2cf8eede7 100644 --- a/drivers/acpi/tables/tbget.c +++ b/drivers/acpi/tables/tbget.c @@ -1,7 +1,7 @@ /****************************************************************************** * * Module Name: tbget - ACPI Table get* routines - * $Revision: 22 $ + * $Revision: 40 $ * *****************************************************************************/ @@ -32,6 +32,7 @@ #define _COMPONENT TABLE_MANAGER MODULE_NAME ("tbget") +#define RSDP_CHECKSUM_LENGTH 20 /******************************************************************************* * @@ -127,7 +128,7 @@ acpi_tb_get_table_ptr ( ACPI_STATUS acpi_tb_get_table ( - void *physical_address, + ACPI_PHYSICAL_ADDRESS physical_address, ACPI_TABLE_HEADER *buffer_ptr, ACPI_TABLE_DESC *table_info) { @@ -239,9 +240,10 @@ acpi_tb_get_all_tables ( MEMSET (&table_info, 0, sizeof (ACPI_TABLE_DESC)); - /* Get the table via the RSDT */ + /* Get the table via the XSDT */ - status = acpi_tb_get_table ((void *) acpi_gbl_RSDT->table_offset_entry[index], + status = acpi_tb_get_table ((ACPI_PHYSICAL_ADDRESS) + acpi_gbl_XSDT->table_offset_entry[index], table_ptr, &table_info); /* Ignore a table that failed verification */ @@ -266,15 +268,25 @@ acpi_tb_get_all_tables ( * determine if there are enough tables to continue. */ - acpi_tb_delete_single_table (&table_info); + acpi_tb_uninstall_table (&table_info); } } /* + * Convert the FADT to a common format. This allows earlier revisions of the + * table to coexist with newer versions, using common access code. + */ + status = acpi_tb_convert_table_fadt (); + if (ACPI_FAILURE (status)) { + return (status); + } + + + /* * Get the minimum set of ACPI tables, namely: * - * 1) FACP (via RSDT in loop above) + * 1) FADT (via RSDT in loop above) * 2) FACS * 3) DSDT * @@ -282,8 +294,8 @@ acpi_tb_get_all_tables ( /* - * Get the FACS (must have the FACP first, from loop above) - * Acpi_tb_get_table_facs will fail if FACP pointer is not valid + * Get the FACS (must have the FADT first, from loop above) + * Acpi_tb_get_table_facs will fail if FADT pointer is not valid */ status = acpi_tb_get_table_facs (table_ptr, &table_info); @@ -291,6 +303,7 @@ acpi_tb_get_all_tables ( return (status); } + /* Install the FACS */ status = acpi_tb_install_table (table_ptr, &table_info); @@ -298,10 +311,22 @@ acpi_tb_get_all_tables ( return (status); } + /* + * Create the common FACS pointer table + * (Contains pointers to the original table) + */ - /* Get the DSDT (We know that the FACP if valid now) */ + status = acpi_tb_build_common_facs (&table_info); + if (ACPI_FAILURE (status)) { + return (status); + } + + + /* + * Get the DSDT (We know that the FADT is valid now) + */ - status = acpi_tb_get_table ((void *) acpi_gbl_FACP->dsdt, table_ptr, &table_info); + status = acpi_tb_get_table (acpi_gbl_FADT->Xdsdt, table_ptr, &table_info); if (ACPI_FAILURE (status)) { return (status); } @@ -321,9 +346,265 @@ acpi_tb_get_all_tables ( * Initialize the capabilities flags. * Assumes that platform supports ACPI_MODE since we have tables! */ - acpi_gbl_system_flags |= acpi_hw_get_mode_capabilities (); + + /* Always delete the RSDP mapping, we are done with it */ + + acpi_tb_delete_acpi_table (ACPI_TABLE_RSDP); + + return (status); +} + + +/******************************************************************************* + * + * FUNCTION: Acpi_tb_verify_rsdp + * + * PARAMETERS: Number_of_tables - Where the table count is placed + * + * RETURN: Status + * + * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table) + * + ******************************************************************************/ + +ACPI_STATUS +acpi_tb_verify_rsdp ( + ACPI_PHYSICAL_ADDRESS rsdp_physical_address) +{ + ACPI_TABLE_DESC table_info; + ACPI_STATUS status; + u8 *table_ptr; + + + /* + * Obtain access to the RSDP structure + */ + status = acpi_os_map_memory (rsdp_physical_address, + sizeof (RSDP_DESCRIPTOR), + (void **) &table_ptr); + if (ACPI_FAILURE (status)) { + return (status); + } + + /* + * The signature and checksum must both be correct + */ + if (STRNCMP ((NATIVE_CHAR *) table_ptr, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) { + /* Nope, BAD Signature */ + + status = AE_BAD_SIGNATURE; + goto cleanup; + } + + if (acpi_tb_checksum (table_ptr, RSDP_CHECKSUM_LENGTH) != 0) { + /* Nope, BAD Checksum */ + + status = AE_BAD_CHECKSUM; + goto cleanup; + } + + /* TBD: Check extended checksum if table version >= 2 */ + + /* The RSDP supplied is OK */ + + table_info.pointer = (ACPI_TABLE_HEADER *) table_ptr; + table_info.length = sizeof (RSDP_DESCRIPTOR); + table_info.allocation = ACPI_MEM_MAPPED; + table_info.base_pointer = table_ptr; + + /* Save the table pointers and allocation info */ + + status = acpi_tb_init_table_descriptor (ACPI_TABLE_RSDP, &table_info); + if (ACPI_FAILURE (status)) { + goto cleanup; + } + + + /* Save the RSDP in a global for easy access */ + + acpi_gbl_RSDP = (RSDP_DESCRIPTOR *) table_info.pointer; + return (status); + + + /* Error exit */ +cleanup: + + acpi_os_unmap_memory (table_ptr, sizeof (RSDP_DESCRIPTOR)); + return (status); +} + + +/******************************************************************************* + * + * FUNCTION: Acpi_tb_get_table_rsdt + * + * PARAMETERS: Number_of_tables - Where the table count is placed + * + * RETURN: Status + * + * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table) + * + ******************************************************************************/ + +ACPI_STATUS +acpi_tb_get_table_rsdt ( + u32 *number_of_tables) +{ + ACPI_TABLE_DESC table_info; + ACPI_STATUS status = AE_OK; + ACPI_PHYSICAL_ADDRESS physical_address; + u32 signature_length; + char *table_signature; + + + /* + * Get the RSDT from the RSDP + */ + + /* + * For RSDP revision 0 or 1, we use the RSDT. + * For RSDP revision 2 (and above), we use the XSDT + */ + if (acpi_gbl_RSDP->revision < 2) { +#ifdef _IA64 + /* 0.71 RSDP has 64bit Rsdt address field */ + physical_address = ((RSDP_DESCRIPTOR_REV071 *)acpi_gbl_RSDP)->rsdt_physical_address; +#else + physical_address = acpi_gbl_RSDP->rsdt_physical_address; +#endif + table_signature = RSDT_SIG; + signature_length = sizeof (RSDT_SIG) -1; + } + else { + physical_address = (ACPI_PHYSICAL_ADDRESS) acpi_gbl_RSDP->xsdt_physical_address; + table_signature = XSDT_SIG; + signature_length = sizeof (XSDT_SIG) -1; + } + + + /* Get the RSDT/XSDT */ + + status = acpi_tb_get_table (physical_address, NULL, &table_info); + if (ACPI_FAILURE (status)) { + return (status); + } + + + /* Check the RSDT or XSDT signature */ + + if (STRNCMP ((char *) table_info.pointer, table_signature, + signature_length)) + { + /* Invalid RSDT or XSDT signature */ + + REPORT_ERROR (("Invalid signature where RSDP indicates %s should be located\n", + table_signature)); + + return (status); + } + + + /* Valid RSDT signature, verify the checksum */ + + status = acpi_tb_verify_table_checksum (table_info.pointer); + + + /* Convert and/or copy to an XSDT structure */ + + status = acpi_tb_convert_to_xsdt (&table_info, number_of_tables); + if (ACPI_FAILURE (status)) { + return (status); + } + + /* Save the table pointers and allocation info */ + + status = acpi_tb_init_table_descriptor (ACPI_TABLE_XSDT, &table_info); + if (ACPI_FAILURE (status)) { + return (status); + } + + acpi_gbl_XSDT = (XSDT_DESCRIPTOR *) table_info.pointer; + + return (status); +} + + +/****************************************************************************** + * + * FUNCTION: Acpi_tb_get_table_facs + * + * PARAMETERS: *Buffer_ptr - If Buffer_ptr is valid, read data from + * buffer rather than searching memory + * *Table_info - Where the table info is returned + * + * RETURN: Status + * + * DESCRIPTION: Returns a pointer to the FACS as defined in FADT. This + * function assumes the global variable FADT has been + * correctly initialized. The value of FADT->Firmware_ctrl + * into a far pointer which is returned. + * + *****************************************************************************/ + +ACPI_STATUS +acpi_tb_get_table_facs ( + ACPI_TABLE_HEADER *buffer_ptr, + ACPI_TABLE_DESC *table_info) +{ + void *table_ptr = NULL; + u32 size; + u8 allocation; + ACPI_STATUS status = AE_OK; + + + /* Must have a valid FADT pointer */ + + if (!acpi_gbl_FADT) { + return (AE_NO_ACPI_TABLES); + } + + size = sizeof (FACS_DESCRIPTOR); + if (buffer_ptr) { + /* + * Getting table from a file -- allocate a buffer and + * read the table. + */ + table_ptr = acpi_cm_allocate (size); + if(!table_ptr) { + return (AE_NO_MEMORY); + } + + MEMCPY (table_ptr, buffer_ptr, size); + + /* Save allocation type */ + + allocation = ACPI_MEM_ALLOCATED; + } + + else { + /* Just map the physical memory to our address space */ + + status = acpi_tb_map_acpi_table (acpi_gbl_FADT->Xfirmware_ctrl, + &size, &table_ptr); + if (ACPI_FAILURE(status)) { + return (status); + } + + /* Save allocation type */ + + allocation = ACPI_MEM_MAPPED; + } + + + /* Return values */ + + table_info->pointer = table_ptr; + table_info->length = size; + table_info->allocation = allocation; + table_info->base_pointer = table_ptr; + return (status); } |