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-rw-r--r--arch/x86/include/asm/x86_init.h26
-rw-r--r--arch/x86/kernel/platform-quirks.c11
-rw-r--r--drivers/pnp/pnpbios/core.c3
-rw-r--r--include/linux/pnp.h2
4 files changed, 41 insertions, 1 deletions
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index 89d9d57e145d..4dcdf74dfed8 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -142,15 +142,41 @@ struct x86_cpuinit_ops {
struct timespec;
/**
+ * struct x86_legacy_devices - legacy x86 devices
+ *
+ * @pnpbios: this platform can have a PNPBIOS. If this is disabled the platform
+ * is known to never have a PNPBIOS.
+ *
+ * These are devices known to require LPC or ISA bus. The definition of legacy
+ * devices adheres to the ACPI 5.2.9.3 IA-PC Boot Architecture flag
+ * ACPI_FADT_LEGACY_DEVICES. These devices consist of user visible devices on
+ * the LPC or ISA bus. User visible devices are devices that have end-user
+ * accessible connectors (for example, LPT parallel port). Legacy devices on
+ * the LPC bus consist for example of serial and parallel ports, PS/2 keyboard
+ * / mouse, and the floppy disk controller. A system that lacks all known
+ * legacy devices can assume all devices can be detected exclusively via
+ * standard device enumeration mechanisms including the ACPI namespace.
+ *
+ * A system which has does not have ACPI_FADT_LEGACY_DEVICES enabled must not
+ * have any of the legacy devices enumerated below present.
+ */
+struct x86_legacy_devices {
+ int pnpbios;
+};
+
+/**
* struct x86_legacy_features - legacy x86 features
*
* @rtc: this device has a CMOS real-time clock present
* @ebda_search: it's safe to search for the EBDA signature in the hardware's
* low RAM
+ * @devices: legacy x86 devices, refer to struct x86_legacy_devices
+ * documentation for further details.
*/
struct x86_legacy_features {
int rtc;
int ebda_search;
+ struct x86_legacy_devices devices;
};
/**
diff --git a/arch/x86/kernel/platform-quirks.c b/arch/x86/kernel/platform-quirks.c
index 01b159781d96..ab643825a7aa 100644
--- a/arch/x86/kernel/platform-quirks.c
+++ b/arch/x86/kernel/platform-quirks.c
@@ -8,6 +8,7 @@ void __init x86_early_init_platform_quirks(void)
{
x86_platform.legacy.rtc = 1;
x86_platform.legacy.ebda_search = 0;
+ x86_platform.legacy.devices.pnpbios = 1;
switch (boot_params.hdr.hardware_subarch) {
case X86_SUBARCH_PC:
@@ -15,6 +16,9 @@ void __init x86_early_init_platform_quirks(void)
break;
case X86_SUBARCH_XEN:
case X86_SUBARCH_LGUEST:
+ x86_platform.legacy.devices.pnpbios = 0;
+ x86_platform.legacy.rtc = 0;
+ break;
case X86_SUBARCH_INTEL_MID:
x86_platform.legacy.rtc = 0;
break;
@@ -23,3 +27,10 @@ void __init x86_early_init_platform_quirks(void)
if (x86_platform.set_legacy_features)
x86_platform.set_legacy_features();
}
+
+#if defined(CONFIG_PNPBIOS)
+bool __init arch_pnpbios_disabled(void)
+{
+ return x86_platform.legacy.devices.pnpbios == 0;
+}
+#endif
diff --git a/drivers/pnp/pnpbios/core.c b/drivers/pnp/pnpbios/core.c
index facd43b8516c..81603d99082b 100644
--- a/drivers/pnp/pnpbios/core.c
+++ b/drivers/pnp/pnpbios/core.c
@@ -521,10 +521,11 @@ static int __init pnpbios_init(void)
int ret;
if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) ||
- paravirt_enabled()) {
+ arch_pnpbios_disabled()) {
printk(KERN_INFO "PnPBIOS: Disabled\n");
return -ENODEV;
}
+
#ifdef CONFIG_PNPACPI
if (!acpi_disabled && !pnpacpi_disabled) {
pnpbios_disabled = 1;
diff --git a/include/linux/pnp.h b/include/linux/pnp.h
index 5df733b8f704..2588ca6a9028 100644
--- a/include/linux/pnp.h
+++ b/include/linux/pnp.h
@@ -337,9 +337,11 @@ extern struct mutex pnp_res_mutex;
#ifdef CONFIG_PNPBIOS
extern struct pnp_protocol pnpbios_protocol;
+extern bool arch_pnpbios_disabled(void);
#define pnp_device_is_pnpbios(dev) ((dev)->protocol == (&pnpbios_protocol))
#else
#define pnp_device_is_pnpbios(dev) 0
+#define arch_pnpbios_disabled() false
#endif
#ifdef CONFIG_PNPACPI