1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012,2013 - ARM Ltd 4 * Author: Marc Zyngier <marc.zyngier@arm.com> 5 */ 6 7 #ifndef __ARM_KVM_INIT_H__ 8 #define __ARM_KVM_INIT_H__ 9 10 #ifndef __ASSEMBLY__ 11 #error Assembly-only header 12 #endif 13 14 #include <asm/kvm_arm.h> 15 #include <asm/ptrace.h> 16 #include <asm/sysreg.h> 17 #include <linux/irqchip/arm-gic-v3.h> 18 19 .macro __init_el2_sctlr 20 mov_q x0, INIT_SCTLR_EL2_MMU_OFF 21 msr sctlr_el2, x0 22 isb 23 .endm 24 25 /* 26 * Allow Non-secure EL1 and EL0 to access physical timer and counter. 27 * This is not necessary for VHE, since the host kernel runs in EL2, 28 * and EL0 accesses are configured in the later stage of boot process. 29 * Note that when HCR_EL2.E2H == 1, CNTHCTL_EL2 has the same bit layout 30 * as CNTKCTL_EL1, and CNTKCTL_EL1 accessing instructions are redefined 31 * to access CNTHCTL_EL2. This allows the kernel designed to run at EL1 32 * to transparently mess with the EL0 bits via CNTKCTL_EL1 access in 33 * EL2. 34 */ 35 .macro __init_el2_timers 36 mov x0, #3 // Enable EL1 physical timers 37 msr cnthctl_el2, x0 38 msr cntvoff_el2, xzr // Clear virtual offset 39 .endm 40 41 .macro __init_el2_debug 42 mrs x1, id_aa64dfr0_el1 43 sbfx x0, x1, #ID_AA64DFR0_PMUVER_SHIFT, #4 44 cmp x0, #1 45 b.lt .Lskip_pmu_\@ // Skip if no PMU present 46 mrs x0, pmcr_el0 // Disable debug access traps 47 ubfx x0, x0, #11, #5 // to EL2 and allow access to 48 .Lskip_pmu_\@: 49 csel x2, xzr, x0, lt // all PMU counters from EL1 50 51 /* Statistical profiling */ 52 ubfx x0, x1, #ID_AA64DFR0_PMSVER_SHIFT, #4 53 cbz x0, .Lskip_spe_\@ // Skip if SPE not present 54 55 mrs_s x0, SYS_PMBIDR_EL1 // If SPE available at EL2, 56 and x0, x0, #(1 << SYS_PMBIDR_EL1_P_SHIFT) 57 cbnz x0, .Lskip_spe_el2_\@ // then permit sampling of physical 58 mov x0, #(1 << SYS_PMSCR_EL2_PCT_SHIFT | \ 59 1 << SYS_PMSCR_EL2_PA_SHIFT) 60 msr_s SYS_PMSCR_EL2, x0 // addresses and physical counter 61 .Lskip_spe_el2_\@: 62 mov x0, #(MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT) 63 orr x2, x2, x0 // If we don't have VHE, then 64 // use EL1&0 translation. 65 66 .Lskip_spe_\@: 67 /* Trace buffer */ 68 ubfx x0, x1, #ID_AA64DFR0_TRBE_SHIFT, #4 69 cbz x0, .Lskip_trace_\@ // Skip if TraceBuffer is not present 70 71 mrs_s x0, SYS_TRBIDR_EL1 72 and x0, x0, TRBIDR_PROG 73 cbnz x0, .Lskip_trace_\@ // If TRBE is available at EL2 74 75 mov x0, #(MDCR_EL2_E2TB_MASK << MDCR_EL2_E2TB_SHIFT) 76 orr x2, x2, x0 // allow the EL1&0 translation 77 // to own it. 78 79 .Lskip_trace_\@: 80 msr mdcr_el2, x2 // Configure debug traps 81 .endm 82 83 /* LORegions */ 84 .macro __init_el2_lor 85 mrs x1, id_aa64mmfr1_el1 86 ubfx x0, x1, #ID_AA64MMFR1_LOR_SHIFT, 4 87 cbz x0, .Lskip_lor_\@ 88 msr_s SYS_LORC_EL1, xzr 89 .Lskip_lor_\@: 90 .endm 91 92 /* Stage-2 translation */ 93 .macro __init_el2_stage2 94 msr vttbr_el2, xzr 95 .endm 96 97 /* GICv3 system register access */ 98 .macro __init_el2_gicv3 99 mrs x0, id_aa64pfr0_el1 100 ubfx x0, x0, #ID_AA64PFR0_GIC_SHIFT, #4 101 cbz x0, .Lskip_gicv3_\@ 102 103 mrs_s x0, SYS_ICC_SRE_EL2 104 orr x0, x0, #ICC_SRE_EL2_SRE // Set ICC_SRE_EL2.SRE==1 105 orr x0, x0, #ICC_SRE_EL2_ENABLE // Set ICC_SRE_EL2.Enable==1 106 msr_s SYS_ICC_SRE_EL2, x0 107 isb // Make sure SRE is now set 108 mrs_s x0, SYS_ICC_SRE_EL2 // Read SRE back, 109 tbz x0, #0, 1f // and check that it sticks 110 msr_s SYS_ICH_HCR_EL2, xzr // Reset ICC_HCR_EL2 to defaults 111 .Lskip_gicv3_\@: 112 .endm 113 114 .macro __init_el2_hstr 115 msr hstr_el2, xzr // Disable CP15 traps to EL2 116 .endm 117 118 /* Virtual CPU ID registers */ 119 .macro __init_el2_nvhe_idregs 120 mrs x0, midr_el1 121 mrs x1, mpidr_el1 122 msr vpidr_el2, x0 123 msr vmpidr_el2, x1 124 .endm 125 126 /* Coprocessor traps */ 127 .macro __init_el2_nvhe_cptr 128 mov x0, #0x33ff 129 msr cptr_el2, x0 // Disable copro. traps to EL2 130 .endm 131 132 /* SVE register access */ 133 .macro __init_el2_nvhe_sve 134 mrs x1, id_aa64pfr0_el1 135 ubfx x1, x1, #ID_AA64PFR0_SVE_SHIFT, #4 136 cbz x1, .Lskip_sve_\@ 137 138 bic x0, x0, #CPTR_EL2_TZ // Also disable SVE traps 139 msr cptr_el2, x0 // Disable copro. traps to EL2 140 isb 141 mov x1, #ZCR_ELx_LEN_MASK // SVE: Enable full vector 142 msr_s SYS_ZCR_EL2, x1 // length for EL1. 143 .Lskip_sve_\@: 144 .endm 145 146 /* Disable any fine grained traps */ 147 .macro __init_el2_fgt 148 mrs x1, id_aa64mmfr0_el1 149 ubfx x1, x1, #ID_AA64MMFR0_FGT_SHIFT, #4 150 cbz x1, .Lskip_fgt_\@ 151 152 mov x0, xzr 153 mrs x1, id_aa64dfr0_el1 154 ubfx x1, x1, #ID_AA64DFR0_PMSVER_SHIFT, #4 155 cmp x1, #3 156 b.lt .Lset_fgt_\@ 157 /* Disable PMSNEVFR_EL1 read and write traps */ 158 orr x0, x0, #(1 << 62) 159 160 .Lset_fgt_\@: 161 msr_s SYS_HDFGRTR_EL2, x0 162 msr_s SYS_HDFGWTR_EL2, x0 163 msr_s SYS_HFGRTR_EL2, xzr 164 msr_s SYS_HFGWTR_EL2, xzr 165 msr_s SYS_HFGITR_EL2, xzr 166 167 mrs x1, id_aa64pfr0_el1 // AMU traps UNDEF without AMU 168 ubfx x1, x1, #ID_AA64PFR0_AMU_SHIFT, #4 169 cbz x1, .Lskip_fgt_\@ 170 171 msr_s SYS_HAFGRTR_EL2, xzr 172 .Lskip_fgt_\@: 173 .endm 174 175 .macro __init_el2_nvhe_prepare_eret 176 mov x0, #INIT_PSTATE_EL1 177 msr spsr_el2, x0 178 .endm 179 180 /** 181 * Initialize EL2 registers to sane values. This should be called early on all 182 * cores that were booted in EL2. Note that everything gets initialised as 183 * if VHE was not evailable. The kernel context will be upgraded to VHE 184 * if possible later on in the boot process 185 * 186 * Regs: x0, x1 and x2 are clobbered. 187 */ 188 .macro init_el2_state 189 __init_el2_sctlr 190 __init_el2_timers 191 __init_el2_debug 192 __init_el2_lor 193 __init_el2_stage2 194 __init_el2_gicv3 195 __init_el2_hstr 196 __init_el2_nvhe_idregs 197 __init_el2_nvhe_cptr 198 __init_el2_nvhe_sve 199 __init_el2_fgt 200 __init_el2_nvhe_prepare_eret 201 .endm 202 203 #endif /* __ARM_KVM_INIT_H__ */ 204