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Commit ae00d812 authored by Len Brown's avatar Len Brown
Browse files

ACPI: extend "acpi_osi=" boot option 



The boot option "acpi_osi=" has always disabled Linux _OSI support,
thus disabling all OS Interface strings which are advertised
by Linux to the BIOS.

Now...
acpi_osi="string" adds the interface string, and
acpi_osi="!string" invalidates the pre-defined interface string

eg. acpi_osi="!Windows 2006"
would disable Linux's claim of Vista compatibility.

Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent c420bc9f

Documentation/kernel-parameters.txt

+4 −1
Original line number Diff line number Diff line
@@ -170,7 +170,10 @@ and is between 256 and 4096 characters. It is defined in the file 
	acpi_os_name=	[HW,ACPI] Tell ACPI BIOS the name of the OS

			Format: To spoof as Windows 98: ="Microsoft Windows"



	acpi_osi=	[HW,ACPI] empty param disables _OSI

	acpi_osi=	[HW,ACPI] Modify list of supported OS interface strings

			acpi_osi="string1"	# add string1 -- only one string

			acpi_osi="!string2"	# remove built-in string2

			acpi_osi=		# disable all strings



	acpi_serialize	[HW,ACPI] force serialization of AML methods

drivers/acpi/osl.c

+16 −9
Original line number Diff line number Diff line
@@ -73,6 +73,9 @@ static void *acpi_irq_context; 
static struct workqueue_struct *kacpid_wq;

static struct workqueue_struct *kacpi_notify_wq;



#define	OSI_STRING_LENGTH_MAX 64	/* arbitrary */

static char osi_additional_string[OSI_STRING_LENGTH_MAX];



static void __init acpi_request_region (struct acpi_generic_address *addr,

	unsigned int length, char *desc)

{
@@ -961,19 +964,23 @@ static int __init acpi_os_name_setup(char *str) 
__setup("acpi_os_name=", acpi_os_name_setup);



/*

 * _OSI control

 * Modify the list of "OS Interfaces" reported to BIOS via _OSI

 *

 * empty string disables _OSI

 * TBD additional string adds to _OSI

 * string starting with '!' disables that string

 * otherwise string is added to list, augmenting built-in strings

 */

static int __init acpi_osi_setup(char *str)

{

	if (str == NULL || *str == '\0') {

		printk(KERN_INFO PREFIX "_OSI method disabled\n");

		acpi_gbl_create_osi_method = FALSE;

	} else {

		/* TBD */

		printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",

		       str);

	} else if (*str == '!') {

		if (acpi_osi_invalidate(++str) == AE_OK)

			printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);

	} else if (*osi_additional_string == '\0') {

		strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);

		printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);

	}



	return 1;
@@ -1143,11 +1150,11 @@ acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 
acpi_status

acpi_os_validate_interface (char *interface)

{



	if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))

		return AE_OK;

	return AE_SUPPORT;

}





/******************************************************************************

 *

 * FUNCTION:    acpi_os_validate_address

drivers/acpi/utilities/uteval.c

+26 −1
Original line number Diff line number Diff line
@@ -59,7 +59,7 @@ acpi_ut_translate_one_cid(union acpi_operand_object *obj_desc, 
/*

 * Strings supported by the _OSI predefined (internal) method.

 */

static const char *acpi_interfaces_supported[] = {

static char *acpi_interfaces_supported[] = {

	/* Operating System Vendor Strings */



	"Linux",
@@ -156,6 +156,31 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state) 
	return_ACPI_STATUS(AE_CTRL_TERMINATE);

}



/*******************************************************************************

 *

 * FUNCTION:    acpi_osi_invalidate

 *

 * PARAMETERS:  interface_string

 *

 * RETURN:      Status

 *

 * DESCRIPTION: invalidate string in pre-defiend _OSI string list

 *

 ******************************************************************************/



acpi_status acpi_osi_invalidate(char *interface)

{

	int i;



	for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {

		if (!ACPI_STRCMP(interface, acpi_interfaces_supported[i])) {

			*acpi_interfaces_supported[i] = '\0';

			return AE_OK;

		}

	}

	return AE_NOT_FOUND;

}



/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_evaluate_object

include/acpi/acpiosxf.h

+1 −0
Original line number Diff line number Diff line
@@ -236,6 +236,7 @@ acpi_os_derive_pci_id(acpi_handle rhandle, 
 * Miscellaneous

 */

acpi_status acpi_os_validate_interface(char *interface);

acpi_status acpi_osi_invalidate(char* interface);



acpi_status

acpi_os_validate_address(u8 space_id,