[SPARC64]: Add initial code to twiddle %gl on trap entry/exit.

Instead of setting/clearing PSTATE_AG we have to change
the %gl register value on sun4v.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/setup.c b/arch/sparc64/kernel/setup.c
index 2918ed3eb1ba..aaab319ad885 100644
--- a/arch/sparc64/kernel/setup.c
+++ b/arch/sparc64/kernel/setup.c
@@ -545,6 +545,24 @@ static void __init per_cpu_patch(void)
 #endif
 }
 
+static void __init gl_patch(void)
+{
+        struct gl_1insn_patch_entry *p;
+
+        if (tlb_type != hypervisor)
+                return;
+
+        p = &__gl_1insn_patch;
+        while (p < &__gl_1insn_patch_end) {
+                unsigned long addr = p->addr;
+
+                *(unsigned int *) (addr +  0) = p->insn;
+                __asm__ __volatile__("flush     %0" : : "r" (addr +  0));
+
+                p++;
+        }
+}
+
 void __init setup_arch(char **cmdline_p)
 {
         /* Initialize PROM console and command line. */
@@ -567,6 +585,8 @@ void __init setup_arch(char **cmdline_p)
          */
         per_cpu_patch();
 
+        gl_patch();
+
         boot_flags_init(*cmdline_p);
 
         idprom_init();