alpha: Primitive support for CPU power down.

Use WTINT to wait for the next interrupt.  Squash the WTINT call
if the PALcode doesn't support it (e.g. MILO).  No attempt is yet
made to skip clock ticks during normal scheduling in order to stay
in power down mode longer.

Signed-off-by: Richard Henderson <rth@twiddle.net>

1 files changed, 15 insertions, 0 deletions

diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c
index bd0665cdc840..9c4c189eb22f 100644
--- a/arch/alpha/kernel/traps.c
+++ b/arch/alpha/kernel/traps.c
@@ -241,6 +241,21 @@ do_entIF(unsigned long type, struct pt_regs *regs)
                                (const char *)(data[1] | (long)data[2] << 32), 
                                data[0]);
                 }
+#ifdef CONFIG_ALPHA_WTINT
+                if (type == 4) {
+                        /* If CALL_PAL WTINT is totally unsupported by the
+                           PALcode, e.g. MILO, "emulate" it by overwriting
+                           the insn.  */
+                        unsigned int *pinsn
+                          = (unsigned int *) regs->pc - 1;
+                        if (*pinsn == PAL_wtint) {
+                                *pinsn = 0x47e01400; /* mov 0,$0 */
+                                imb();
+                                regs->r0 = 0;
+                                return;
+                        }
+                }
+#endif /* ALPHA_WTINT */
                 die_if_kernel((type == 1 ? "Kernel Bug" : "Instruction fault"),
                               regs, type, NULL);
         }