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ACPI: extend "acpi_osi=" boot option

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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: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown
2007-05-29 18:43:33 -04:00
parent c420bc9f09
commit ae00d81243
4 changed files with 47 additions and 11 deletions
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25
drivers/acpi/osl.c
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@@ -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)
{
return AE_SUPPORT;
if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
return AE_OK;
return AE_SUPPORT;
}
/******************************************************************************
*
* FUNCTION: acpi_os_validate_address