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nohash_low.S

nohash_low.S 1.4 KB
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  1. /* SPDX-License-Identifier: GPL-2.0-or-later */
    2. 

  2. /*
    3. 

  3.  *  This file contains low-level assembler routines for managing
    4. 

  4.  *  the PowerPC 603 tlb invalidation.
    5. 

  5.  */
    6. 

  6. 

  7. #include <asm/page.h>
    8. 

  8. #include <asm/ppc_asm.h>
    9. 

  9. #include <asm/asm-offsets.h>
    10. 

  10. 

  11. /*
    12. 

  12.  * Flush an entry from the TLB
    13. 

  13.  */
    14. 

  14. #ifdef CONFIG_SMP
    15. 

  15. _GLOBAL(_tlbie)
    16. 

  16. 	lwz	r8,TASK_CPU(r2)
    17. 

  17. 	oris	r8,r8,11
    18. 

  18. 	mfmsr	r10
    19. 

  19. 	rlwinm	r0,r10,0,17,15		/* clear bit 16 (MSR_EE) */
    20. 

  20. 	rlwinm	r0,r0,0,28,26		/* clear DR */
    21. 

  21. 	mtmsr	r0
    22. 

  22. 	isync
    23. 

  23. 	lis	r9,mmu_hash_lock@h
    24. 

  24. 	ori	r9,r9,mmu_hash_lock@l
    25. 

  25. 	tophys(r9,r9)
    26. 

  26. 10:	lwarx	r7,0,r9
    27. 

  27. 	cmpwi	0,r7,0
    28. 

  28. 	bne-	10b
    29. 

  29. 	stwcx.	r8,0,r9
    30. 

  30. 	bne-	10b
    31. 

  31. 	eieio
    32. 

  32. 	tlbie	r3
    33. 

  33. 	sync
    34. 

  34. 	TLBSYNC
    35. 

  35. 	li	r0,0
    36. 

  36. 	stw	r0,0(r9)		/* clear mmu_hash_lock */
    37. 

  37. 	mtmsr	r10
    38. 

  38. 	isync
    39. 

  39. 	blr
    40. 

  40. _ASM_NOKPROBE_SYMBOL(_tlbie)
    41. 

  41. #endif /* CONFIG_SMP */
    42. 

  42. 

  43. /*
    44. 

  44.  * Flush the entire TLB. 603/603e only
    45. 

  45.  */
    46. 

  46. _GLOBAL(_tlbia)
    47. 

  47. #if defined(CONFIG_SMP)
    48. 

  48. 	lwz	r8,TASK_CPU(r2)
    49. 

  49. 	oris	r8,r8,10
    50. 

  50. 	mfmsr	r10
    51. 

  51. 	rlwinm	r0,r10,0,17,15		/* clear bit 16 (MSR_EE) */
    52. 

  52. 	rlwinm	r0,r0,0,28,26		/* clear DR */
    53. 

  53. 	mtmsr	r0
    54. 

  54. 	isync
    55. 

  55. 	lis	r9,mmu_hash_lock@h
    56. 

  56. 	ori	r9,r9,mmu_hash_lock@l
    57. 

  57. 	tophys(r9,r9)
    58. 

  58. 10:	lwarx	r7,0,r9
    59. 

  59. 	cmpwi	0,r7,0
    60. 

  60. 	bne-	10b
    61. 

  61. 	stwcx.	r8,0,r9
    62. 

  62. 	bne-	10b
    63. 

  63. #endif /* CONFIG_SMP */
    64. 

  64. 	li	r5, 32
    65. 

  65. 	lis	r4, KERNELBASE@h
    66. 

  66. 	mtctr	r5
    67. 

  67. 	sync
    68. 

  68. 0:	tlbie	r4
    69. 

  69. 	addi	r4, r4, 0x1000
    70. 

  70. 	bdnz	0b
    71. 

  71. 	sync
    72. 

  72. #ifdef CONFIG_SMP
    73. 

  73. 	TLBSYNC
    74. 

  74. 	li	r0,0
    75. 

  75. 	stw	r0,0(r9)		/* clear mmu_hash_lock */
    76. 

  76. 	mtmsr	r10
    77. 

  77. 	isync
    78. 

  78. #endif /* CONFIG_SMP */
    79. 

  79. 	blr
    80. 

  80. _ASM_NOKPROBE_SYMBOL(_tlbia)
    81.