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 */ 69