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epapr_hcalls.S

epapr_hcalls.S 1.3 KB
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  1. /*
    2. 

  2.  * Copyright (C) 2012 Freescale Semiconductor, Inc.
    3. 

  3.  *
    4. 

  4.  * This program is free software; you can redistribute it and/or
    5. 

  5.  * modify it under the terms of the GNU General Public License
    6. 

  6.  * as published by the Free Software Foundation; either version
    7. 

  7.  * 2 of the License, or (at your option) any later version.
    8. 

  8.  */
    9. 

  9. 

  10. #include <linux/threads.h>
    11. 

  11. #include <asm/epapr_hcalls.h>
    12. 

  12. #include <asm/reg.h>
    13. 

  13. #include <asm/page.h>
    14. 

  14. #include <asm/cputable.h>
    15. 

  15. #include <asm/thread_info.h>
    16. 

  16. #include <asm/ppc_asm.h>
    17. 

  17. #include <asm/asm-compat.h>
    18. 

  18. #include <asm/asm-offsets.h>
    19. 

  19. 

  20. /* epapr_ev_idle() was derived from e500_idle() */
    21. 

  21. _GLOBAL(epapr_ev_idle)
    22. 

  22. 	CURRENT_THREAD_INFO(r3, r1)
    23. 

  23. 	PPC_LL	r4, TI_LOCAL_FLAGS(r3)	/* set napping bit */
    24. 

  24. 	ori	r4, r4,_TLF_NAPPING	/* so when we take an exception */
    25. 

  25. 	PPC_STL	r4, TI_LOCAL_FLAGS(r3)	/* it will return to our caller */
    26. 

  26. 

  27. 	wrteei	1
    28. 

  28. 

  29. idle_loop:
    30. 

  30. 	LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE))
    31. 

  31. 

  32. .global epapr_ev_idle_start
    33. 

  33. epapr_ev_idle_start:
    34. 

  34. 	li	r3, -1
    35. 

  35. 	nop
    36. 

  36. 	nop
    37. 

  37. 	nop
    38. 

  38. 

  39. 	/*
    40. 

  40. 	 * Guard against spurious wakeups from a hypervisor --
    41. 

  41. 	 * only interrupt will cause us to return to LR due to
    42. 

  42. 	 * _TLF_NAPPING.
    43. 

  43. 	 */
    44. 

  44. 	b	idle_loop
    45. 

  45. 

  46. /* Hypercall entry point. Will be patched with device tree instructions. */
    47. 

  47. .global epapr_hypercall_start
    48. 

  48. epapr_hypercall_start:
    49. 

  49. 	li	r3, -1
    50. 

  50. 	nop
    51. 

  51. 	nop
    52. 

  52. 	nop
    53. 

  53. 	blr
    54.