arch/powerpc/include/asm/kvm_booke_hv_asm.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright 2010-2011 Freescale Semiconductor, Inc.
   4  */
   5
   6 #ifndef ASM_KVM_BOOKE_HV_ASM_H
   7 #define ASM_KVM_BOOKE_HV_ASM_H
   8
   9 #include <asm/feature-fixups.h>
  10
  11 #ifdef __ASSEMBLY__
  12
  13 /*
  14  * All exceptions from guest state must go through KVM
  15  * (except for those which are delivered directly to the guest) --
  16  * there are no exceptions for which we fall through directly to
  17  * the normal host handler.
  18  *
  19  * 32-bit host
  20  * Expected inputs (normal exceptions):
  21  *   SCRATCH0 = saved r10
  22  *   r10 = thread struct
  23  *   r11 = appropriate SRR1 variant (currently used as scratch)
  24  *   r13 = saved CR
  25  *   *(r10 + THREAD_NORMSAVE(0)) = saved r11
  26  *   *(r10 + THREAD_NORMSAVE(2)) = saved r13
  27  *
  28  * Expected inputs (crit/mcheck/debug exceptions):
  29  *   appropriate SCRATCH = saved r8
  30  *   r8 = exception level stack frame
  31  *   r9 = *(r8 + _CCR) = saved CR
  32  *   r11 = appropriate SRR1 variant (currently used as scratch)
  33  *   *(r8 + GPR9) = saved r9
  34  *   *(r8 + GPR10) = saved r10 (r10 not yet clobbered)
  35  *   *(r8 + GPR11) = saved r11
  36  *
  37  * 64-bit host
  38  * Expected inputs (GEN/GDBELL/DBG/CRIT/MC exception types):
  39  *  r10 = saved CR
  40  *  r13 = PACA_POINTER
  41  *  *(r13 + PACA_EX##type + EX_R10) = saved r10
  42  *  *(r13 + PACA_EX##type + EX_R11) = saved r11
  43  *  SPRN_SPRG_##type##_SCRATCH = saved r13
  44  *
  45  * Expected inputs (TLB exception type):
  46  *  r10 = saved CR
  47  *  r12 = extlb pointer
  48  *  r13 = PACA_POINTER
  49  *  *(r12 + EX_TLB_R10) = saved r10
  50  *  *(r12 + EX_TLB_R11) = saved r11
  51  *  *(r12 + EX_TLB_R13) = saved r13
  52  *  SPRN_SPRG_GEN_SCRATCH = saved r12
  53  *
  54  * Only the bolted version of TLB miss exception handlers is supported now.
  55  */
  56 .macro DO_KVM intno srr1
  57 #ifdef CONFIG_KVM_BOOKE_HV
  58 BEGIN_FTR_SECTION
  59         mtocrf  0x80, r11       /* check MSR[GS] without clobbering reg */
  60         bf      3, 1975f
  61         b       kvmppc_handler_\intno\()_\srr1
  62 1975:
  63 END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
  64 #endif
  65 .endm
  66
  67 #endif /*__ASSEMBLY__ */
  68 #endif /* ASM_KVM_BOOKE_HV_ASM_H */