LXR linux/arch/powerpc/kernel/epapr

   1/*
   2 * Copyright (C) 2012 Freescale Semiconductor, Inc.
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU General Public License
   6 * as published by the Free Software Foundation; either version
   7 * 2 of the License, or (at your option) any later version.
   8 */
   9
  10#include <linux/threads.h>
  11#include <asm/epapr_hcalls.h>
  12#include <asm/reg.h>
  13#include <asm/page.h>
  14#include <asm/cputable.h>
  15#include <asm/thread_info.h>
  16#include <asm/ppc_asm.h>
  17#include <asm/asm-compat.h>
  18#include <asm/asm-offsets.h>
  19
  20#ifndef CONFIG_PPC64
  21/* epapr_ev_idle() was derived from e500_idle() */
  22_GLOBAL(epapr_ev_idle)
  23        CURRENT_THREAD_INFO(r3, r1)
  24        PPC_LL  r4, TI_LOCAL_FLAGS(r3)  /* set napping bit */
  25        ori     r4, r4,_TLF_NAPPING     /* so when we take an exception */
  26        PPC_STL r4, TI_LOCAL_FLAGS(r3)  /* it will return to our caller */
  27
  28        wrteei  1
  29
  30idle_loop:
  31        LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE))
  32
  33.global epapr_ev_idle_start
  34epapr_ev_idle_start:
  35        li      r3, -1
  36        nop
  37        nop
  38        nop
  39
  40        /*
  41         * Guard against spurious wakeups from a hypervisor --
  42         * only interrupt will cause us to return to LR due to
  43         * _TLF_NAPPING.
  44         */
  45        b       idle_loop
  46#endif
  47
  48/* Hypercall entry point. Will be patched with device tree instructions. */
  49.global epapr_hypercall_start
  50epapr_hypercall_start:
  51        li      r3, -1
  52        nop
  53        nop
  54        nop
  55        blr
  56