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linux-vybrid_pu...
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arch
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powerpc
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kernel
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kvm_emul.S

kvm_emul.S 2.1 KB
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  1. /*
    2. 

  2.  * This program is free software; you can redistribute it and/or modify
    3. 

  3.  * it under the terms of the GNU General Public License, version 2, as
    4. 

  4.  * published by the Free Software Foundation.
    5. 

  5.  *
    6. 

  6.  * This program is distributed in the hope that it will be useful,
    7. 

  7.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    8. 

  8.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    9. 

  9.  * GNU General Public License for more details.
    10. 

  10.  *
    11. 

  11.  * You should have received a copy of the GNU General Public License
    12. 

  12.  * along with this program; if not, write to the Free Software
    13. 

  13.  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
    14. 

  14.  *
    15. 

  15.  * Copyright SUSE Linux Products GmbH 2010
    16. 

  16.  *
    17. 

  17.  * Authors: Alexander Graf <agraf@suse.de>
    18. 

  18.  */
    19. 

  19. 

  20. #include <asm/ppc_asm.h>
    21. 

  21. #include <asm/kvm_asm.h>
    22. 

  22. #include <asm/reg.h>
    23. 

  23. #include <asm/page.h>
    24. 

  24. #include <asm/asm-offsets.h>
    25. 

  25. 

  26. /* Hypercall entry point. Will be patched with device tree instructions. */
    27. 

  27. 

  28. .global kvm_hypercall_start
    29. 

  29. kvm_hypercall_start:
    30. 

  30. 	li	r3, -1
    31. 

  31. 	nop
    32. 

  32. 	nop
    33. 

  33. 	nop
    34. 

  34. 	blr
    35. 

  35. 

  36. #define KVM_MAGIC_PAGE		(-4096)
    37. 

  37. 

  38. #ifdef CONFIG_64BIT
    39. 

  39. #define LL64(reg, offs, reg2)	ld	reg, (offs)(reg2)
    40. 

  40. #define STL64(reg, offs, reg2)	std	reg, (offs)(reg2)
    41. 

  41. #else
    42. 

  42. #define LL64(reg, offs, reg2)	lwz	reg, (offs + 4)(reg2)
    43. 

  43. #define STL64(reg, offs, reg2)	stw	reg, (offs + 4)(reg2)
    44. 

  44. #endif
    45. 

  45. 

  46. #define SCRATCH_SAVE							\
    47. 

  47. 	/* Enable critical section. We are critical if			\
    48. 

  48. 	   shared->critical == r1 */					\
    49. 

  49. 	STL64(r1, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0);		\
    50. 

  50. 									\
    51. 

  51. 	/* Save state */						\
    52. 

  52. 	PPC_STL	r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH1)(0);		\
    53. 

  53. 	PPC_STL	r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH2)(0);		\
    54. 

  54. 	mfcr	r31;							\
    55. 

  55. 	stw	r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH3)(0);
    56. 

  56. 

  57. #define SCRATCH_RESTORE							\
    58. 

  58. 	/* Restore state */						\
    59. 

  59. 	PPC_LL	r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH1)(0);		\
    60. 

  60. 	lwz	r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH3)(0);		\
    61. 

  61. 	mtcr	r30;							\
    62. 

  62. 	PPC_LL	r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH2)(0);		\
    63. 

  63. 									\
    64. 

  64. 	/* Disable critical section. We are critical if			\
    65. 

  65. 	   shared->critical == r1 and r2 is always != r1 */		\
    66. 

  66. 	STL64(r2, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0);
    67.