diff options
author | Bob Moore <robert.moore@intel.com> | 2012-02-14 18:31:56 +0800 |
---|---|---|
committer | Len Brown <len.brown@intel.com> | 2012-03-22 01:44:59 -0400 |
commit | f7b004a17c9183f023796dea0d70284684ec000d (patch) | |
tree | 885f0b9b00d2592b3bb0ee90c7b1f74aaff5e9b3 /drivers/acpi/acpica | |
parent | ea143604c5c8426923bbed7cd389fdaed7d58a2e (diff) | |
download | linux-f7b004a17c9183f023796dea0d70284684ec000d.tar.gz linux-f7b004a17c9183f023796dea0d70284684ec000d.tar.bz2 linux-f7b004a17c9183f023796dea0d70284684ec000d.zip |
ACPICA: Add acpi_os_physical_table_override interface
This interface allows the host to override a table via a
physical address, instead of the logical address required by
acpi_os_table_override. This simplifies the host implementation.
Initial implementation by Thomas Renninger. ACPICA implementation
creates a single function for table overrides that attempts both
a logical and a physical override.
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/acpica')
-rw-r--r-- | drivers/acpi/acpica/actables.h | 5 | ||||
-rw-r--r-- | drivers/acpi/acpica/tbinstal.c | 117 | ||||
-rw-r--r-- | drivers/acpi/acpica/tbutils.c | 93 |
3 files changed, 152 insertions, 63 deletions
diff --git a/drivers/acpi/acpica/actables.h b/drivers/acpi/acpica/actables.h index d5bec304c823..6712965ba8ae 100644 --- a/drivers/acpi/acpica/actables.h +++ b/drivers/acpi/acpica/actables.h @@ -67,6 +67,11 @@ acpi_status acpi_tb_resize_root_table_list(void); acpi_status acpi_tb_verify_table(struct acpi_table_desc *table_desc); +struct acpi_table_header *acpi_tb_table_override(struct acpi_table_header + *table_header, + struct acpi_table_desc + *table_desc); + acpi_status acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index); diff --git a/drivers/acpi/acpica/tbinstal.c b/drivers/acpi/acpica/tbinstal.c index 1aecf7baa4e0..c03500b4cc7a 100644 --- a/drivers/acpi/acpica/tbinstal.c +++ b/drivers/acpi/acpica/tbinstal.c @@ -114,7 +114,6 @@ acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index) { u32 i; acpi_status status = AE_OK; - struct acpi_table_header *override_table = NULL; ACPI_FUNCTION_TRACE(tb_add_table); @@ -224,25 +223,10 @@ acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index) /* * ACPI Table Override: * Allow the host to override dynamically loaded tables. + * NOTE: the table is fully mapped at this point, and the mapping will + * be deleted by tb_table_override if the table is actually overridden. */ - status = acpi_os_table_override(table_desc->pointer, &override_table); - if (ACPI_SUCCESS(status) && override_table) { - ACPI_INFO((AE_INFO, - "%4.4s @ 0x%p Table override, replaced with:", - table_desc->pointer->signature, - ACPI_CAST_PTR(void, table_desc->address))); - - /* We can delete the table that was passed as a parameter */ - - acpi_tb_delete_table(table_desc); - - /* Setup descriptor for the new table */ - - table_desc->address = ACPI_PTR_TO_PHYSADDR(override_table); - table_desc->pointer = override_table; - table_desc->length = override_table->length; - table_desc->flags = ACPI_TABLE_ORIGIN_OVERRIDE; - } + (void)acpi_tb_table_override(table_desc->pointer, table_desc); /* Add the table to the global root table list */ @@ -263,6 +247,95 @@ acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index) /******************************************************************************* * + * FUNCTION: acpi_tb_table_override + * + * PARAMETERS: table_header - Header for the original table + * table_desc - Table descriptor initialized for the + * original table. May or may not be mapped. + * + * RETURN: Pointer to the entire new table. NULL if table not overridden. + * If overridden, installs the new table within the input table + * descriptor. + * + * DESCRIPTION: Attempt table override by calling the OSL override functions. + * Note: If the table is overridden, then the entire new table + * is mapped and returned by this function. + * + ******************************************************************************/ + +struct acpi_table_header *acpi_tb_table_override(struct acpi_table_header + *table_header, + struct acpi_table_desc + *table_desc) +{ + acpi_status status; + struct acpi_table_header *new_table = NULL; + acpi_physical_address new_address = 0; + u32 new_table_length = 0; + u8 new_flags; + char *override_type; + + /* (1) Attempt logical override (returns a logical address) */ + + status = acpi_os_table_override(table_header, &new_table); + if (ACPI_SUCCESS(status) && new_table) { + new_address = ACPI_PTR_TO_PHYSADDR(new_table); + new_table_length = new_table->length; + new_flags = ACPI_TABLE_ORIGIN_OVERRIDE; + override_type = "Logical"; + goto finish_override; + } + + /* (2) Attempt physical override (returns a physical address) */ + + status = acpi_os_physical_table_override(table_header, + &new_address, + &new_table_length); + if (ACPI_SUCCESS(status) && new_address && new_table_length) { + + /* Map the entire new table */ + + new_table = acpi_os_map_memory(new_address, new_table_length); + if (!new_table) { + ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY, + "%4.4s %p Attempted physical table override failed", + table_header->signature, + ACPI_CAST_PTR(void, + table_desc->address))); + return (NULL); + } + + override_type = "Physical"; + new_flags = ACPI_TABLE_ORIGIN_MAPPED; + goto finish_override; + } + + return (NULL); /* There was no override */ + + finish_override: + + ACPI_INFO((AE_INFO, + "%4.4s %p %s table override, new table: %p", + table_header->signature, + ACPI_CAST_PTR(void, table_desc->address), + override_type, new_table)); + + /* We can now unmap/delete the original table (if fully mapped) */ + + acpi_tb_delete_table(table_desc); + + /* Setup descriptor for the new table */ + + table_desc->address = new_address; + table_desc->pointer = new_table; + table_desc->length = new_table_length; + table_desc->flags = new_flags; + + return (new_table); +} + +/******************************************************************************* + * * FUNCTION: acpi_tb_resize_root_table_list * * PARAMETERS: None @@ -396,7 +469,11 @@ void acpi_tb_delete_table(struct acpi_table_desc *table_desc) case ACPI_TABLE_ORIGIN_ALLOCATED: ACPI_FREE(table_desc->pointer); break; - default:; + + /* Not mapped or allocated, there is nothing we can do */ + + default: + return; } table_desc->pointer = NULL; diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c index 1347c084fc2b..0a706cac37de 100644 --- a/drivers/acpi/acpica/tbutils.c +++ b/drivers/acpi/acpica/tbutils.c @@ -446,7 +446,7 @@ struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index) * RETURN: None * * DESCRIPTION: Install an ACPI table into the global data structure. The - * table override mechanism is implemented here to allow the host + * table override mechanism is called to allow the host * OS to replace any table before it is installed in the root * table array. * @@ -456,11 +456,9 @@ void acpi_tb_install_table(acpi_physical_address address, char *signature, u32 table_index) { - u8 flags; - acpi_status status; - struct acpi_table_header *table_to_install; - struct acpi_table_header *mapped_table; - struct acpi_table_header *override_table = NULL; + struct acpi_table_header *table; + struct acpi_table_header *final_table; + struct acpi_table_desc *table_desc; if (!address) { ACPI_ERROR((AE_INFO, @@ -471,69 +469,78 @@ acpi_tb_install_table(acpi_physical_address address, /* Map just the table header */ - mapped_table = - acpi_os_map_memory(address, sizeof(struct acpi_table_header)); - if (!mapped_table) { + table = acpi_os_map_memory(address, sizeof(struct acpi_table_header)); + if (!table) { + ACPI_ERROR((AE_INFO, + "Could not map memory for table [%s] at %p", + signature, ACPI_CAST_PTR(void, address))); return; } /* If a particular signature is expected (DSDT/FACS), it must match */ - if (signature && !ACPI_COMPARE_NAME(mapped_table->signature, signature)) { + if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) { ACPI_ERROR((AE_INFO, "Invalid signature 0x%X for ACPI table, expected [%s]", - *ACPI_CAST_PTR(u32, mapped_table->signature), - signature)); + *ACPI_CAST_PTR(u32, table->signature), signature)); goto unmap_and_exit; } /* + * Initialize the table entry. Set the pointer to NULL, since the + * table is not fully mapped at this time. + */ + table_desc = &acpi_gbl_root_table_list.tables[table_index]; + + table_desc->address = address; + table_desc->pointer = NULL; + table_desc->length = table->length; + table_desc->flags = ACPI_TABLE_ORIGIN_MAPPED; + ACPI_MOVE_32_TO_32(table_desc->signature.ascii, table->signature); + + /* * ACPI Table Override: * * Before we install the table, let the host OS override it with a new * one if desired. Any table within the RSDT/XSDT can be replaced, * including the DSDT which is pointed to by the FADT. + * + * NOTE: If the table is overridden, then final_table will contain a + * mapped pointer to the full new table. If the table is not overridden, + * or if there has been a physical override, then the table will be + * fully mapped later (in verify table). In any case, we must + * unmap the header that was mapped above. */ - status = acpi_os_table_override(mapped_table, &override_table); - if (ACPI_SUCCESS(status) && override_table) { - ACPI_INFO((AE_INFO, - "%4.4s @ 0x%p Table override, replaced with:", - mapped_table->signature, ACPI_CAST_PTR(void, - address))); - - acpi_gbl_root_table_list.tables[table_index].pointer = - override_table; - address = ACPI_PTR_TO_PHYSADDR(override_table); - - table_to_install = override_table; - flags = ACPI_TABLE_ORIGIN_OVERRIDE; - } else { - table_to_install = mapped_table; - flags = ACPI_TABLE_ORIGIN_MAPPED; + final_table = acpi_tb_table_override(table, table_desc); + if (!final_table) { + final_table = table; /* There was no override */ } - /* Initialize the table entry */ + acpi_tb_print_table_header(table_desc->address, final_table); - acpi_gbl_root_table_list.tables[table_index].address = address; - acpi_gbl_root_table_list.tables[table_index].length = - table_to_install->length; - acpi_gbl_root_table_list.tables[table_index].flags = flags; - - ACPI_MOVE_32_TO_32(& - (acpi_gbl_root_table_list.tables[table_index]. - signature), table_to_install->signature); - - acpi_tb_print_table_header(address, table_to_install); + /* Set the global integer width (based upon revision of the DSDT) */ if (table_index == ACPI_TABLE_INDEX_DSDT) { + acpi_ut_set_integer_width(final_table->revision); + } - /* Global integer width is based upon revision of the DSDT */ - - acpi_ut_set_integer_width(table_to_install->revision); + /* + * If we have a physical override during this early loading of the ACPI + * tables, unmap the table for now. It will be mapped again later when + * it is actually used. This supports very early loading of ACPI tables, + * before virtual memory is fully initialized and running within the + * host OS. Note: A logical override has the ACPI_TABLE_ORIGIN_OVERRIDE + * flag set and will not be deleted below. + */ + if (final_table != table) { + acpi_tb_delete_table(table_desc); } unmap_and_exit: - acpi_os_unmap_memory(mapped_table, sizeof(struct acpi_table_header)); + + /* Always unmap the table header that we mapped above */ + + acpi_os_unmap_memory(table, sizeof(struct acpi_table_header)); } /******************************************************************************* |