x86: check for and defend against BIOS memory corruption

[linux-2.6-omap-h63xx.git] / include / linux / kernel.h

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index fdbbf72ca2ebfbe096171a7b96dbaf539f7fbcbe..8017129e6b631eb67779cb5dec0c9b2b54a5a4ae 100644 (file)
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -75,6 +75,12 @@ extern const char linux_proc_banner[];
  */
 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
 
+/**
+ * lower_32_bits - return bits 0-31 of a number
+ * @n: the number we're accessing
+ */
+#define lower_32_bits(n) ((u32)(n))
+
 #define        KERN_EMERG      "<0>"   /* system is unusable                   */
 #define        KERN_ALERT      "<1>"   /* action must be taken immediately     */
 #define        KERN_CRIT       "<2>"   /* critical conditions                  */
@@ -102,6 +108,13 @@ struct completion;
 struct pt_regs;
 struct user;
 
+#ifdef CONFIG_PREEMPT_VOLUNTARY
+extern int _cond_resched(void);
+# define might_resched() _cond_resched()
+#else
+# define might_resched() do { } while (0)
+#endif
+
 /**
  * might_sleep - annotation for functions that can sleep
  *
@@ -112,13 +125,6 @@ struct user;
  * be bitten later when the calling function happens to sleep when it is not
  * supposed to.
  */
-#ifdef CONFIG_PREEMPT_VOLUNTARY
-extern int _cond_resched(void);
-# define might_resched() _cond_resched()
-#else
-# define might_resched() do { } while (0)
-#endif
-
 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
   void __might_sleep(char *file, int line);
 # define might_sleep() \
@@ -234,6 +240,18 @@ extern const char *print_tainted(void);
 extern void add_taint(unsigned);
 extern int root_mountflags;
 
+#ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
+/*
+ * This is obviously not a great place for this, but we want to be
+ * able to scatter it around anywhere in the kernel.
+ */
+void check_for_bios_corruption(void);
+#else
+static inline void check_for_bios_corruption(void)
+{
+}
+#endif
+
 /* Values used for system_state */
 extern enum system_states {
        SYSTEM_BOOTING,