62 lines
1.1 KiB
ArmAsm
62 lines
1.1 KiB
ArmAsm
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// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
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// SPDX-License-Identifier: BSD-3-Clause
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// Differential kernel for the arm64 system instructions: barriers,
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// cache maintenance, the system register accesses, supervisor calls,
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// breakpoints and prefetches. Every function is byte-compared against
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// go tool asm.
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#include "textflag.h"
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// func barriers()
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TEXT ·barriers(SB), NOSPLIT, $0-0
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DMB $15
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DMB $1
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DSB $15
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DSB $4
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ISB $15
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ISB $1
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RET
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// func cacheOps()
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TEXT ·cacheOps(SB), NOSPLIT, $0-0
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DC ZVA, R4
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DC IVAC, R1
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DC CVAC, R2
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DC CVAU, R3
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DC CIVAC, R7
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RET
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// func sysRegs()
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TEXT ·sysRegs(SB), NOSPLIT, $0-0
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MRS DCZID_EL0, R3
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MRS CNTVCT_EL0, R0
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MRS CNTPCT_EL0, R1
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MRS CNTFRQ_EL0, R2
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MRS MIDR_EL1, R0
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MRS ID_AA64PFR0_EL1, R0
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MRS ID_AA64ISAR0_EL1, R0
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MRS ID_AA64ISAR1_EL1, R0
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MRS DIT, R0
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MSR $3, SPSel
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MSR $9, DAIFSet
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MSR $6, DAIFClr
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MSR $1, DIT
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RET
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// func exceptions()
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TEXT ·exceptions(SB), NOSPLIT, $0-0
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SVC $0
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SVC $7165
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BRK
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BRK $35943
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RET
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// func prefetch()
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TEXT ·prefetch(SB), NOSPLIT, $0-0
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PRFM (R0), PLDL1KEEP
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PRFM (R3), PLDL3KEEP
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PRFM (R4), PSTL1KEEP
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PRFM (R2), $25
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RET
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