arch/powerpc/include/asm/kvm_booke_hv_asm.h

   1 /*
   2  * Copyright 2010-2011 Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License, version 2, as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #ifndef ASM_KVM_BOOKE_HV_ASM_H
  10 #define ASM_KVM_BOOKE_HV_ASM_H
  11
  12 #ifdef __ASSEMBLY__
  13
  14 /*
  15  * All exceptions from guest state must go through KVM
  16  * (except for those which are delivered directly to the guest) --
  17  * there are no exceptions for which we fall through directly to
  18  * the normal host handler.
  19  *
  20  * 32-bit host
  21  * Expected inputs (normal exceptions):
  22  *   SCRATCH0 = saved r10
  23  *   r10 = thread struct
  24  *   r11 = appropriate SRR1 variant (currently used as scratch)
  25  *   r13 = saved CR
  26  *   *(r10 + THREAD_NORMSAVE(0)) = saved r11
  27  *   *(r10 + THREAD_NORMSAVE(2)) = saved r13
  28  *
  29  * Expected inputs (crit/mcheck/debug exceptions):
  30  *   appropriate SCRATCH = saved r8
  31  *   r8 = exception level stack frame
  32  *   r9 = *(r8 + _CCR) = saved CR
  33  *   r11 = appropriate SRR1 variant (currently used as scratch)
  34  *   *(r8 + GPR9) = saved r9
  35  *   *(r8 + GPR10) = saved r10 (r10 not yet clobbered)
  36  *   *(r8 + GPR11) = saved r11
  37  *
  38  * 64-bit host
  39  * Expected inputs (GEN/GDBELL/DBG/CRIT/MC exception types):
  40  *  r10 = saved CR
  41  *  r13 = PACA_POINTER
  42  *  *(r13 + PACA_EX##type + EX_R10) = saved r10
  43  *  *(r13 + PACA_EX##type + EX_R11) = saved r11
  44  *  SPRN_SPRG_##type##_SCRATCH = saved r13
  45  *
  46  * Expected inputs (TLB exception type):
  47  *  r10 = saved CR
  48  *  r12 = extlb pointer
  49  *  r13 = PACA_POINTER
  50  *  *(r12 + EX_TLB_R10) = saved r10
  51  *  *(r12 + EX_TLB_R11) = saved r11
  52  *  *(r12 + EX_TLB_R13) = saved r13
  53  *  SPRN_SPRG_GEN_SCRATCH = saved r12
  54  *
  55  * Only the bolted version of TLB miss exception handlers is supported now.
  56  */
  57 .macro DO_KVM intno srr1
  58 #ifdef CONFIG_KVM_BOOKE_HV
  59 BEGIN_FTR_SECTION
  60         mtocrf  0x80, r11       /* check MSR[GS] without clobbering reg */
  61         bf      3, 1975f
  62         b       kvmppc_handler_\intno\()_\srr1
  63 1975:
  64 END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
  65 #endif
  66 .endm
  67
  68 #endif /*__ASSEMBLY__ */
  69 #endif /* ASM_KVM_BOOKE_HV_ASM_H */