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/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 (CRIT exception type): 47 * r10 = saved CR 48 * r13 = PACA_POINTER 49 * *(r13 + PACA_EX##type + EX_R10) = saved r10 50 * *(r13 + PACA_EX##type + EX_R11) = saved r11 51 * *(r13 + PACA_EX##type + EX_R13) = saved r13 52 * 53 * Expected inputs (TLB exception type): 54 * r10 = saved CR 55 * r13 = PACA_POINTER 56 * *(r13 + PACA_EX##type + EX_TLB_R10) = saved r10 57 * *(r13 + PACA_EX##type + EX_TLB_R11) = saved r11 58 * SPRN_SPRG_GEN_SCRATCH = saved r13 59 * 60 * Only the bolted version of TLB miss exception handlers is supported now. 61 */ 62 .macro DO_KVM intno srr1 63 #ifdef CONFIG_KVM_BOOKE_HV 64 BEGIN_FTR_SECTION 65 mtocrf 0x80, r11 /* check MSR[GS] without clobbering reg */ 66 bf 3, 1975f 67 b kvmppc_handler_\intno\()_\srr1 68 1975: 69 END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) 70 #endif 71 .endm 72 73 #endif /*__ASSEMBLY__ */ 74 #endif /* ASM_KVM_BOOKE_HV_ASM_H */ 75