1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2012,2013 - ARM Ltd
4 * Author: Marc Zyngier <marc.zyngier@arm.com>
7 #ifndef __ARM_KVM_INIT_H__
8 #define __ARM_KVM_INIT_H__
11 #error Assembly-only header
14 #include <asm/kvm_arm.h>
15 #include <asm/ptrace.h>
16 #include <asm/sysreg.h>
17 #include <linux/irqchip/arm-gic-v3.h>
19 .macro __init_el2_sctlr
20 mov_q x0, INIT_SCTLR_EL2_MMU_OFF
25 .macro __init_el2_hcrx
26 mrs x0, id_aa64mmfr1_el1
27 ubfx x0, x0, #ID_AA64MMFR1_EL1_HCX_SHIFT, #4
28 cbz x0, .Lskip_hcrx_\@
29 mov_q x0, HCRX_HOST_FLAGS
30 msr_s SYS_HCRX_EL2, x0
35 * Allow Non-secure EL1 and EL0 to access physical timer and counter.
36 * This is not necessary for VHE, since the host kernel runs in EL2,
37 * and EL0 accesses are configured in the later stage of boot process.
38 * Note that when HCR_EL2.E2H == 1, CNTHCTL_EL2 has the same bit layout
39 * as CNTKCTL_EL1, and CNTKCTL_EL1 accessing instructions are redefined
40 * to access CNTHCTL_EL2. This allows the kernel designed to run at EL1
41 * to transparently mess with the EL0 bits via CNTKCTL_EL1 access in
44 .macro __init_el2_timers
45 mov x0, #3 // Enable EL1 physical timers
52 msr cntvoff_el2, xzr // Clear virtual offset
55 .macro __init_el2_debug
56 mrs x1, id_aa64dfr0_el1
57 sbfx x0, x1, #ID_AA64DFR0_EL1_PMUVer_SHIFT, #4
59 b.lt .Lskip_pmu_\@ // Skip if no PMU present
60 mrs x0, pmcr_el0 // Disable debug access traps
61 ubfx x0, x0, #11, #5 // to EL2 and allow access to
63 csel x2, xzr, x0, lt // all PMU counters from EL1
65 /* Statistical profiling */
66 ubfx x0, x1, #ID_AA64DFR0_EL1_PMSVer_SHIFT, #4
67 cbz x0, .Lskip_spe_\@ // Skip if SPE not present
69 mrs_s x0, SYS_PMBIDR_EL1 // If SPE available at EL2,
70 and x0, x0, #(1 << PMBIDR_EL1_P_SHIFT)
71 cbnz x0, .Lskip_spe_el2_\@ // then permit sampling of physical
72 mov x0, #(1 << PMSCR_EL2_PCT_SHIFT | \
73 1 << PMSCR_EL2_PA_SHIFT)
74 msr_s SYS_PMSCR_EL2, x0 // addresses and physical counter
76 mov x0, #(MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT)
77 orr x2, x2, x0 // If we don't have VHE, then
78 // use EL1&0 translation.
82 ubfx x0, x1, #ID_AA64DFR0_EL1_TraceBuffer_SHIFT, #4
83 cbz x0, .Lskip_trace_\@ // Skip if TraceBuffer is not present
85 mrs_s x0, SYS_TRBIDR_EL1
86 and x0, x0, TRBIDR_EL1_P
87 cbnz x0, .Lskip_trace_\@ // If TRBE is available at EL2
89 mov x0, #(MDCR_EL2_E2TB_MASK << MDCR_EL2_E2TB_SHIFT)
90 orr x2, x2, x0 // allow the EL1&0 translation
94 msr mdcr_el2, x2 // Configure debug traps
99 mrs x1, id_aa64mmfr1_el1
100 ubfx x0, x1, #ID_AA64MMFR1_EL1_LO_SHIFT, 4
101 cbz x0, .Lskip_lor_\@
102 msr_s SYS_LORC_EL1, xzr
106 /* Stage-2 translation */
107 .macro __init_el2_stage2
111 /* GICv3 system register access */
112 .macro __init_el2_gicv3
113 mrs x0, id_aa64pfr0_el1
114 ubfx x0, x0, #ID_AA64PFR0_EL1_GIC_SHIFT, #4
115 cbz x0, .Lskip_gicv3_\@
117 mrs_s x0, SYS_ICC_SRE_EL2
118 orr x0, x0, #ICC_SRE_EL2_SRE // Set ICC_SRE_EL2.SRE==1
119 orr x0, x0, #ICC_SRE_EL2_ENABLE // Set ICC_SRE_EL2.Enable==1
120 msr_s SYS_ICC_SRE_EL2, x0
121 isb // Make sure SRE is now set
122 mrs_s x0, SYS_ICC_SRE_EL2 // Read SRE back,
123 tbz x0, #0, .Lskip_gicv3_\@ // and check that it sticks
124 msr_s SYS_ICH_HCR_EL2, xzr // Reset ICH_HCR_EL2 to defaults
128 .macro __init_el2_hstr
129 msr hstr_el2, xzr // Disable CP15 traps to EL2
132 /* Virtual CPU ID registers */
133 .macro __init_el2_nvhe_idregs
140 /* Coprocessor traps */
141 .macro __init_el2_cptr
145 mov x0, #(CPACR_EL1_FPEN_EL1EN | CPACR_EL1_FPEN_EL0EN)
150 msr cptr_el2, x0 // Disable copro. traps to EL2
153 /* Disable any fine grained traps */
154 .macro __init_el2_fgt
155 mrs x1, id_aa64mmfr0_el1
156 ubfx x1, x1, #ID_AA64MMFR0_EL1_FGT_SHIFT, #4
157 cbz x1, .Lskip_fgt_\@
160 mrs x1, id_aa64dfr0_el1
161 ubfx x1, x1, #ID_AA64DFR0_EL1_PMSVer_SHIFT, #4
163 b.lt .Lset_debug_fgt_\@
164 /* Disable PMSNEVFR_EL1 read and write traps */
165 orr x0, x0, #(1 << 62)
168 msr_s SYS_HDFGRTR_EL2, x0
169 msr_s SYS_HDFGWTR_EL2, x0
172 mrs x1, id_aa64pfr1_el1
173 ubfx x1, x1, #ID_AA64PFR1_EL1_SME_SHIFT, #4
174 cbz x1, .Lset_pie_fgt_\@
176 /* Disable nVHE traps of TPIDR2 and SMPRI */
177 orr x0, x0, #HFGxTR_EL2_nSMPRI_EL1_MASK
178 orr x0, x0, #HFGxTR_EL2_nTPIDR2_EL0_MASK
181 mrs_s x1, SYS_ID_AA64MMFR3_EL1
182 ubfx x1, x1, #ID_AA64MMFR3_EL1_S1PIE_SHIFT, #4
185 /* Disable trapping of PIR_EL1 / PIRE0_EL1 */
186 orr x0, x0, #HFGxTR_EL2_nPIR_EL1
187 orr x0, x0, #HFGxTR_EL2_nPIRE0_EL1
190 msr_s SYS_HFGRTR_EL2, x0
191 msr_s SYS_HFGWTR_EL2, x0
192 msr_s SYS_HFGITR_EL2, xzr
194 mrs x1, id_aa64pfr0_el1 // AMU traps UNDEF without AMU
195 ubfx x1, x1, #ID_AA64PFR0_EL1_AMU_SHIFT, #4
196 cbz x1, .Lskip_fgt_\@
198 msr_s SYS_HAFGRTR_EL2, xzr
202 .macro __init_el2_nvhe_prepare_eret
203 mov x0, #INIT_PSTATE_EL1
208 * Initialize EL2 registers to sane values. This should be called early on all
209 * cores that were booted in EL2. Note that everything gets initialised as
210 * if VHE was not available. The kernel context will be upgraded to VHE
211 * if possible later on in the boot process
213 * Regs: x0, x1 and x2 are clobbered.
215 .macro init_el2_state
224 __init_el2_nvhe_idregs
229 #ifndef __KVM_NVHE_HYPERVISOR__
230 // This will clobber tmp1 and tmp2, and expect tmp1 to contain
231 // the id register value as read from the HW
232 .macro __check_override idreg, fld, width, pass, fail, tmp1, tmp2
233 ubfx \tmp1, \tmp1, #\fld, #\width
236 adr_l \tmp1, \idreg\()_override
237 ldr \tmp2, [\tmp1, FTR_OVR_VAL_OFFSET]
238 ldr \tmp1, [\tmp1, FTR_OVR_MASK_OFFSET]
239 ubfx \tmp2, \tmp2, #\fld, #\width
240 ubfx \tmp1, \tmp1, #\fld, #\width
242 and \tmp2, \tmp2, \tmp1
243 csinv \tmp2, \tmp2, xzr, ne
248 // This will clobber tmp1 and tmp2
249 .macro check_override idreg, fld, pass, fail, tmp1, tmp2
250 mrs \tmp1, \idreg\()_el1
251 __check_override \idreg \fld 4 \pass \fail \tmp1 \tmp2
254 // This will clobber tmp
255 .macro __check_override idreg, fld, width, pass, fail, tmp, ignore
256 ldr_l \tmp, \idreg\()_el1_sys_val
257 ubfx \tmp, \tmp, #\fld, #\width
262 .macro check_override idreg, fld, pass, fail, tmp, ignore
263 __check_override \idreg \fld 4 \pass \fail \tmp \ignore
267 .macro finalise_el2_state
268 check_override id_aa64pfr0, ID_AA64PFR0_EL1_SVE_SHIFT, .Linit_sve_\@, .Lskip_sve_\@, x1, x2
270 .Linit_sve_\@: /* SVE register access */
271 mrs x0, cptr_el2 // Disable SVE traps
274 cbz x1, .Lcptr_nvhe_\@
277 orr x0, x0, #(CPACR_EL1_ZEN_EL1EN | CPACR_EL1_ZEN_EL0EN)
280 .Lcptr_nvhe_\@: // nVHE case
281 bic x0, x0, #CPTR_EL2_TZ
285 mov x1, #ZCR_ELx_LEN_MASK // SVE: Enable full vector
286 msr_s SYS_ZCR_EL2, x1 // length for EL1.
289 check_override id_aa64pfr1, ID_AA64PFR1_EL1_SME_SHIFT, .Linit_sme_\@, .Lskip_sme_\@, x1, x2
291 .Linit_sme_\@: /* SME register access and priority mapping */
292 mrs x0, cptr_el2 // Disable SME traps
293 bic x0, x0, #CPTR_EL2_TSM
298 orr x1, x1, #SCTLR_ELx_ENTP2 // Disable TPIDR2 traps
302 mov x0, #0 // SMCR controls
305 mrs_s x1, SYS_ID_AA64SMFR0_EL1
306 __check_override id_aa64smfr0, ID_AA64SMFR0_EL1_FA64_SHIFT, 1, .Linit_sme_fa64_\@, .Lskip_sme_fa64_\@, x1, x2
309 orr x0, x0, SMCR_ELx_FA64_MASK
313 mrs_s x1, SYS_ID_AA64SMFR0_EL1
314 __check_override id_aa64smfr0, ID_AA64SMFR0_EL1_SMEver_SHIFT, 4, .Linit_sme_zt0_\@, .Lskip_sme_zt0_\@, x1, x2
316 orr x0, x0, SMCR_ELx_EZT0_MASK
319 orr x0, x0, #SMCR_ELx_LEN_MASK // Enable full SME vector
320 msr_s SYS_SMCR_EL2, x0 // length for EL1.
322 mrs_s x1, SYS_SMIDR_EL1 // Priority mapping supported?
323 ubfx x1, x1, #SMIDR_EL1_SMPS_SHIFT, #1
324 cbz x1, .Lskip_sme_\@
326 msr_s SYS_SMPRIMAP_EL2, xzr // Make all priorities equal
330 #endif /* __ARM_KVM_INIT_H__ */