diff options
| author | Len Brown <len.brown@intel.com> | 2007-05-29 18:43:33 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-05-29 18:43:33 -0400 |
| commit | ae00d812436dc968f4a5dea7757b6a94910b6dc4 (patch) | |
| tree | 6acd68850bead001cc74597369307a82bc711f6e /drivers/acpi/osl.c | |
| parent | c420bc9f09a0926b708c3edb27eacba434a4f4ba (diff) | |
| download | linux-ae00d812436dc968f4a5dea7757b6a94910b6dc4.tar.gz | |
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: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/osl.c')
| -rw-r--r-- | drivers/acpi/osl.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index b998340e23d4..f4760cfa61e1 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -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 |