LXR linux/arch/powerpc/kernel/epapr

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * Copyright (C) 2012 Freescale Semiconductor, Inc.
   4 */
   5
   6#include <linux/threads.h>
   7#include <asm/epapr_hcalls.h>
   8#include <asm/reg.h>
   9#include <asm/page.h>
  10#include <asm/cputable.h>
  11#include <asm/thread_info.h>
  12#include <asm/ppc_asm.h>
  13#include <asm/asm-compat.h>
  14#include <asm/asm-offsets.h>
  15#include <asm/export.h>
  16
  17#ifndef CONFIG_PPC64
  18/* epapr_ev_idle() was derived from e500_idle() */
  19_GLOBAL(epapr_ev_idle)
  20        PPC_LL  r4, TI_LOCAL_FLAGS(r2)  /* set napping bit */
  21        ori     r4, r4,_TLF_NAPPING     /* so when we take an exception */
  22        PPC_STL r4, TI_LOCAL_FLAGS(r2)  /* it will return to our caller */
  23
  24        wrteei  1
  25
  26idle_loop:
  27        LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE))
  28
  29.global epapr_ev_idle_start
  30epapr_ev_idle_start:
  31        li      r3, -1
  32        nop
  33        nop
  34        nop
  35
  36        /*
  37         * Guard against spurious wakeups from a hypervisor --
  38         * only interrupt will cause us to return to LR due to
  39         * _TLF_NAPPING.
  40         */
  41        b       idle_loop
  42#endif
  43
  44/* Hypercall entry point. Will be patched with device tree instructions. */
  45.global epapr_hypercall_start
  46epapr_hypercall_start:
  47        li      r3, -1
  48        nop
  49        nop
  50        nop
  51        blr
  52EXPORT_SYMBOL(epapr_hypercall_start)
  53