[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>

2 files changed, 9 insertions, 0 deletions

diff --git a/include/asm-sparc64/cpudata.h b/include/asm-sparc64/cpudata.h
index 4f28a85c1043..8666440c89af 100644
--- a/include/asm-sparc64/cpudata.h
+++ b/include/asm-sparc64/cpudata.h
@@ -73,6 +73,11 @@ struct cpuid_patch_entry {
 extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
 #endif
 
+struct gl_1insn_patch_entry {
+        unsigned int    addr;
+        unsigned int    insn;
+};
+extern struct gl_1insn_patch_entry __gl_1insn_patch, __gl_1insn_patch_end;
 #endif /* !(__ASSEMBLY__) */
 
 #define TRAP_PER_CPU_THREAD     0x00
diff --git a/include/asm-sparc64/head.h b/include/asm-sparc64/head.h
index 731c842f3d11..ff76c0981b63 100644
--- a/include/asm-sparc64/head.h
+++ b/include/asm-sparc64/head.h
@@ -4,6 +4,10 @@
 
 #include <asm/pstate.h>
 
+        /* wrpr %g0, val, %gl */
+#define SET_GL(val)     \
+        .word   0xa1902000 | val
+
 #define KERNBASE        0x400000
 
 #define PTREGS_OFF      (STACK_BIAS + STACKFRAME_SZ)