linux 2.6.16.38 w/ vs2.0.3-rc1

[linux-2.6.git] / arch / sparc64 / prom / p1275.c

diff --git a/arch/sparc64/prom/p1275.c b/arch/sparc64/prom/p1275.c
index 2b32c48..a5a7c57 100644 (file)
--- a/arch/sparc64/prom/p1275.c
+++ b/arch/sparc64/prom/p1275.c
@@ -30,6 +30,16 @@ extern void prom_world(int);
 extern void prom_cif_interface(void);
 extern void prom_cif_callback(void);
 
+static inline unsigned long spitfire_get_primary_context(void)
+{
+       unsigned long ctx;
+
+       __asm__ __volatile__("ldxa      [%1] %2, %0"
+                            : "=r" (ctx)
+                            : "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
+       return ctx;
+}
+
 /*
  * This provides SMP safety on the p1275buf. prom_callback() drops this lock
  * to allow recursuve acquisition.
@@ -45,6 +55,7 @@ long p1275_cmd(const char *service, long fmt, ...)
        long attrs, x;
        
        p = p1275buf.prom_buffer;
+       BUG_ON((spitfire_get_primary_context() & CTX_NR_MASK) != 0);
 
        spin_lock_irqsave(&prom_entry_lock, flags);