ref: d1cebf608b05e45b148108ac6c16ae94f6862097
dir: /sys/src/9/imx8/l.s/
#include "mem.h" #include "sysreg.h" #undef SYSREG #define SYSREG(op0,op1,Cn,Cm,op2) SPR(((op0)<<19|(op1)<<16|(Cn)<<12|(Cm)<<8|(op2)<<5)) TEXT _start(SB), 1, $-4 MOV R0, R26 /* save */ MOV $setSB-KZERO(SB), R28 BL svcmode<>(SB) /* use dedicated stack pointer per exception level */ MOVWU $1, R1 MSR R1, SPSel BL mmudisable<>(SB) /* invalidate local caches */ BL cachedwbinv(SB) BL l2cacheuwbinv(SB) BL cacheiinv(SB) MOV $(MACHADDR(0)-KZERO), R27 MRS MPIDR_EL1, R1 ANDW $(MAXMACH-1), R1 MOVWU $MACHSIZE, R2 MULW R1, R2, R2 SUB R2, R27 ADD $(MACHSIZE-16), R27, R2 MOV R2, SP CBNZ R1, _startup /* clear page table and machs */ MOV $(L1-KZERO), R1 MOV $(MACHADDR(-1)-KZERO), R2 _zerol1: MOV ZR, (R1)8! CMP R1, R2 BNE _zerol1 /* clear BSS */ MOV $edata-KZERO(SB), R1 MOV $end-KZERO(SB), R2 _zerobss: MOV ZR, (R1)8! CMP R1, R2 BNE _zerobss /* setup page tables */ MOV $(L1-KZERO), R0 BL mmu0init(SB) SEVL _startup: WFE BL mmuenable<>(SB) MOV R26, R0 MOV $0, R26 ORR $KZERO, R27 MSR R27, TPIDR_EL1 MOV $setSB(SB), R28 BL main(SB) TEXT stop<>(SB), 1, $-4 _stop: WFE B _stop TEXT aaa<>(SB), 1, $-4 xxx: MOV $(0x860040+VIRTIO), R1 MOVW $'A', R2 MOVW R2, (R1) B xxx TEXT sev(SB), 1, $-4 SEV WFE RETURN TEXT svcmode<>(SB), 1, $-4 MSR $0xF, DAIFSet MRS CurrentEL, R0 ANDW $(3<<2), R0 CMPW $(1<<2), R0 BEQ el1 CMPW $(2<<2), R0 BEQ el2 B stop<>(SB) el2: MOV $0, R0 MSR R0, MDCR_EL2 ISB $SY /* set virtual timer offset to zero */ MOV $0, R0 MSR R0, CNTVOFF_EL2 /* HCR = RW, HCD, SWIO, BSU, FB */ MOVWU $(1<<31 | 1<<29 | 1<<2 | 0<<10 | 0<<9), R0 MSR R0, HCR_EL2 ISB $SY /* SCTLR = RES1 */ MOVWU $(3<<4 | 1<<11 | 1<<16 | 1<<18 | 3<<22 | 3<<28), R0 ISB $SY MSR R0, SCTLR_EL2 ISB $SY /* set VMID to zero */ MOV $0, R0 MSR R0, VTTBR_EL2 ISB $SY MOVWU $(0xF<<6 | 4), R0 MSR R0, SPSR_EL2 MSR LR, ELR_EL2 ERET el1: RETURN TEXT mmudisable<>(SB), 1, $-4 #define SCTLRCLR \ /* RES0 */ ( 3<<30 \ /* RES0 */ | 1<<27 \ /* UCI */ | 1<<26 \ /* EE */ | 1<<25 \ /* RES0 */ | 1<<21 \ /* E0E */ | 1<<24 \ /* WXN */ | 1<<19 \ /* nTWE */ | 1<<18 \ /* RES0 */ | 1<<17 \ /* nTWI */ | 1<<16 \ /* UCT */ | 1<<15 \ /* DZE */ | 1<<14 \ /* RES0 */ | 1<<13 \ /* RES0 */ | 1<<10 \ /* UMA */ | 1<<9 \ /* SA0 */ | 1<<4 \ /* SA */ | 1<<3 \ /* A */ | 1<<1 ) #define SCTLRSET \ /* RES1 */ ( 3<<28 \ /* RES1 */ | 3<<22 \ /* RES1 */ | 1<<20 \ /* RES1 */ | 1<<11 ) #define SCTLRMMU \ /* I */ ( 1<<12 \ /* C */ | 1<<2 \ /* M */ | 1<<0 ) /* initialise SCTLR, MMU and caches off */ ISB $SY MRS SCTLR_EL1, R0 BIC $(SCTLRCLR | SCTLRMMU), R0 ORR $SCTLRSET, R0 ISB $SY MSR R0, SCTLR_EL1 ISB $SY B flushlocaltlb(SB) TEXT mmuenable<>(SB), 1, $-4 /* return to virtual */ ORR $KZERO, LR MOV LR, -16(RSP)! BL flushlocaltlb(SB) /* memory attributes */ #define MAIRINIT \ ( 0xFF << MA_MEM_WB*8 \ | 0x33 << MA_MEM_WT*8 \ | 0x44 << MA_MEM_UC*8 \ | 0x00 << MA_DEV_nGnRnE*8 \ | 0x04 << MA_DEV_nGnRE*8 \ | 0x08 << MA_DEV_nGRE*8 \ | 0x0C << MA_DEV_GRE*8 ) MOV $MAIRINIT, R1 MSR R1, MAIR_EL1 ISB $SY /* translation control */ #define TCRINIT \ /* TBI1 */ ( 0<<38 \ /* TBI0 */ | 0<<37 \ /* AS */ | 0<<36 \ /* TG1 */ | (((3<<16|1<<14|2<<12)>>PGSHIFT)&3)<<30 \ /* SH1 */ | SHARE_INNER<<28 \ /* ORGN1 */ | CACHE_WB<<26 \ /* IRGN1 */ | CACHE_WB<<24 \ /* EPD1 */ | 0<<23 \ /* A1 */ | 0<<22 \ /* T1SZ */ | (64-EVASHIFT)<<16 \ /* TG0 */ | (((1<<16|2<<14|0<<12)>>PGSHIFT)&3)<<14 \ /* SH0 */ | SHARE_INNER<<12 \ /* ORGN0 */ | CACHE_WB<<10 \ /* IRGN0 */ | CACHE_WB<<8 \ /* EPD0 */ | 0<<7 \ /* T0SZ */ | (64-EVASHIFT)<<0 ) MOV $TCRINIT, R1 MRS ID_AA64MMFR0_EL1, R2 ANDW $0x7, R2 // PARange ADD R2<<32, R1 // IPS MSR R1, TCR_EL1 ISB $SY /* load the page tables */ MOV $(L1TOP-KZERO), R0 ISB $SY MSR R0, TTBR0_EL1 MSR R0, TTBR1_EL1 ISB $SY /* enable MMU and caches */ MRS SCTLR_EL1, R1 ORR $SCTLRMMU, R1 ISB $SY MSR R1, SCTLR_EL1 ISB $SY MOV RSP, R1 ORR $KZERO, R1 MOV R1, RSP MOV (RSP)16!, LR B cacheiinv(SB) TEXT touser(SB), 1, $-4 MSR $0x3, DAIFSet // interrupts off MOVWU $0x10028, R1 // entry MOVWU $0, R2 // psr MSR R0, SP_EL0 // sp MSR R1, ELR_EL1 MSR R2, SPSR_EL1 ERET TEXT cas(SB), 1, $-4 TEXT cmpswap(SB), 1, $-4 MOVWU ov+8(FP), R1 MOVWU nv+16(FP), R2 _cas1: LDXRW (R0), R3 CMP R3, R1 BNE _cas0 STXRW R2, (R0), R4 CBNZ R4, _cas1 MOVW $1, R0 DMB $ISH RETURN _cas0: CLREX MOVW $0, R0 RETURN TEXT tas(SB), 1, $-4 TEXT _tas(SB), 1, $-4 MOVW $0xdeaddead, R2 _tas1: LDXRW (R0), R1 STXRW R2, (R0), R3 CBNZ R3, _tas1 MOVW R1, R0 TEXT coherence(SB), 1, $-4 DMB $ISH RETURN TEXT islo(SB), 1, $-4 MRS DAIF, R0 AND $(0x2<<6), R0 EOR $(0x2<<6), R0 RETURN TEXT splhi(SB), 1, $-4 MRS DAIF, R0 MSR $0x2, DAIFSet RETURN TEXT splfhi(SB), 1, $-4 MRS DAIF, R0 MSR $0x3, DAIFSet RETURN TEXT spllo(SB), 1, $-4 MSR $0x3, DAIFClr RETURN TEXT splflo(SB), 1, $-4 MSR $0x1, DAIFClr RETURN TEXT splx(SB), 1, $-4 MSR R0, DAIF RETURN TEXT idlehands(SB), 1, $-4 DMB $ISH MOV $nrdy(SB), R1 LDXRW (R1), R0 CBZ R0, _goodnight CLREX SEVL _goodnight: WFE RETURN TEXT vcycles(SB), 1, $-4 MRS CNTVCT_EL0, R0 RETURN TEXT lcycles(SB), 1, $-4 MRS PMCCNTR_EL0, R0 RETURN TEXT setlabel(SB), 1, $-4 MOV LR, 8(R0) MOV SP, R1 MOV R1, 0(R0) MOVW $0, R0 RETURN TEXT gotolabel(SB), 1, $-4 MOV 8(R0), LR /* link */ MOV 0(R0), R1 /* sp */ MOV R1, SP MOVW $1, R0 RETURN TEXT returnto(SB), 1, $-4 MOV R0, 0(SP) RETURN TEXT getfar(SB), 1, $-4 MRS FAR_EL1, R0 RETURN TEXT setttbr(SB), 1, $-4 DSB $ISHST MSR R0, TTBR0_EL1 DSB $ISH ISB $SY RETURN /* * TLB maintenance operations. * these broadcast to all cpu's in the cluser * (inner sharable domain). */ TEXT flushasidva(SB), 1, $-4 TEXT tlbivae1is(SB), 1, $-4 DSB $ISHST TLBI R0, 0,8,3,1 /* VAE1IS */ DSB $ISH ISB $SY RETURN TEXT flushasidvall(SB), 1, $-4 TEXT tlbivale1is(SB), 1, $-4 DSB $ISHST TLBI R0, 0,8,3,5 /* VALE1IS */ DSB $ISH ISB $SY RETURN TEXT flushasid(SB), 1, $-4 TEXT tlbiaside1is(SB), 1, $-4 DSB $ISHST TLBI R0, 0,8,3,2 /* ASIDE1IS */ DSB $ISH ISB $SY RETURN TEXT flushtlb(SB), 1, $-4 TEXT tlbivmalle1is(SB), 1, $-4 DSB $ISHST TLBI R0, 0,8,3,0 /* VMALLE1IS */ DSB $ISH ISB $SY RETURN /* * flush the tlb of this cpu. no broadcast. */ TEXT flushlocaltlb(SB), 1, $-4 TEXT tlbivmalle1(SB), 1, $-4 DSB $NSHST TLBI R0, 0,8,7,0 /* VMALLE1 */ DSB $NSH ISB $SY RETURN /* * floating-point support. */ TEXT fpon(SB), 1, $-4 MOVW $(3<<20), R0 MSR R0, CPACR_EL1 RETURN TEXT fpoff(SB), 1, $-4 MOVW $(0<<20), R0 MSR R0, CPACR_EL1 RETURN TEXT fpsaveregs(SB), 1, $-4 WORD $(1<<30 | 3 << 26 | 2<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 0) /* MOV { V0, V1, V2, V3 }, (R0)64! */ WORD $(1<<30 | 3 << 26 | 2<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 4) /* MOV { V4, V5, V6, V7 }, (R0)64! */ WORD $(1<<30 | 3 << 26 | 2<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 8) /* MOV { V8, V9, V10,V11 }, (R0)64! */ WORD $(1<<30 | 3 << 26 | 2<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 12) /* MOV { V12,V13,V14,V15 }, (R0)64! */ WORD $(1<<30 | 3 << 26 | 2<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 16) /* MOV { V16,V17,V18,V19 }, (R0)64! */ WORD $(1<<30 | 3 << 26 | 2<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 20) /* MOV { V20,V21,V22,V23 }, (R0)64! */ WORD $(1<<30 | 3 << 26 | 2<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 24) /* MOV { V24,V25,V26,V27 }, (R0)64! */ WORD $(1<<30 | 3 << 26 | 2<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 28) /* MOV { V28,V29,V30,V31 }, (R0)64! */ RETURN TEXT fploadregs(SB), 1, $-4 WORD $(1<<30 | 3 << 26 | 3<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 0) /* MOV (R0)64!, { V0, V1, V2, V3 } */ WORD $(1<<30 | 3 << 26 | 3<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 4) /* MOV (R0)64!, { V4, V5, V6, V7 } */ WORD $(1<<30 | 3 << 26 | 3<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 8) /* MOV (R0)64!, { V8, V9, V10,V11 } */ WORD $(1<<30 | 3 << 26 | 3<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 12) /* MOV (R0)64!, { V12,V13,V14,V15 } */ WORD $(1<<30 | 3 << 26 | 3<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 16) /* MOV (R0)64!, { V16,V17,V18,V19 } */ WORD $(1<<30 | 3 << 26 | 3<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 20) /* MOV (R0)64!, { V20,V21,V22,V23 } */ WORD $(1<<30 | 3 << 26 | 3<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 24) /* MOV (R0)64!, { V24,V25,V26,V27 } */ WORD $(1<<30 | 3 << 26 | 3<<22 | 0x1F<<16 | 3<<10 | 0<<5 | 28) /* MOV (R0)64!, { V28,V29,V30,V31 } */ RETURN // syscall or trap from EL0 TEXT vsys0(SB), 1, $-4 LSRW $26, R0, R17 // ec CMPW $0x15, R17 // SVC trap? BNE _itsatrap // nope. MOVP R26, R27, 224(RSP) MOVP R28, R29, 240(RSP) MRS SP_EL0, R1 MRS ELR_EL1, R2 MRS SPSR_EL1, R3 MOV R0, 288(RSP) // type MOV R1, 264(RSP) // sp MOV R2, 272(RSP) // pc MOV R3, 280(RSP) // psr MOV $setSB(SB), R28 MRS TPIDR_EL1, R27 MOV 16(R27), R26 ADD $16, RSP, R0 // ureg BL syscall(SB) TEXT forkret(SB), 1, $-4 MSR $0x3, DAIFSet // interrupts off ADD $16, RSP, R0 // ureg MOV 16(RSP), R0 // ret MOV 264(RSP), R1 // sp MOV 272(RSP), R2 // pc MOV 280(RSP), R3 // psr MSR R1, SP_EL0 MSR R2, ELR_EL1 MSR R3, SPSR_EL1 MOVP 224(RSP), R26, R27 MOVP 240(RSP), R28, R29 MOV 256(RSP), R30 // link ADD $TRAPFRAMESIZE, RSP ERET TEXT itsatrap<>(SB), 1, $-4 _itsatrap: MOVP R1, R2, 24(RSP) MOVP R3, R4, 40(RSP) MOVP R5, R6, 56(RSP) MOVP R7, R8, 72(RSP) MOVP R9, R10, 88(RSP) MOVP R11, R12, 104(RSP) MOVP R13, R14, 120(RSP) MOVP R15, R16, 136(RSP) MOVP R18, R19, 160(RSP) MOVP R20, R21, 176(RSP) MOVP R22, R23, 192(RSP) MOVP R24, R25, 208(RSP) // trap/irq/fiq/serr from EL0 TEXT vtrap0(SB), 1, $-4 MOVP R26, R27, 224(RSP) MOVP R28, R29, 240(RSP) MRS SP_EL0, R1 MRS ELR_EL1, R2 MRS SPSR_EL1, R3 MOV R0, 288(RSP) // type MOV R1, 264(RSP) // sp MOV R2, 272(RSP) // pc MOV R3, 280(RSP) // psr MOV $setSB(SB), R28 MRS TPIDR_EL1, R27 MOV 16(R27), R26 ADD $16, RSP, R0 // ureg BL trap(SB) TEXT noteret(SB), 1, $-4 MSR $0x3, DAIFSet // interrupts off ADD $16, RSP, R0 // ureg MOV 264(RSP), R1 // sp MOV 272(RSP), R2 // pc MOV 280(RSP), R3 // psr MSR R1, SP_EL0 MSR R2, ELR_EL1 MSR R3, SPSR_EL1 MOVP 224(RSP), R26, R27 MOVP 240(RSP), R28, R29 _intrreturn: MOVP 16(RSP), R0, R1 MOVP 32(RSP), R2, R3 MOVP 48(RSP), R4, R5 MOVP 64(RSP), R6, R7 MOVP 80(RSP), R8, R9 MOVP 96(RSP), R10, R11 MOVP 112(RSP), R12, R13 MOVP 128(RSP), R14, R15 MOVP 144(RSP), R16, R17 MOVP 160(RSP), R18, R19 MOVP 176(RSP), R20, R21 MOVP 192(RSP), R22, R23 MOVP 208(RSP), R24, R25 MOV 256(RSP), R30 // link ADD $TRAPFRAMESIZE, RSP ERET // irq/fiq/trap/serr from EL1 TEXT vtrap1(SB), 1, $-4 MOV R29, 248(RSP) // special ADD $TRAPFRAMESIZE, RSP, R1 MRS ELR_EL1, R2 MRS SPSR_EL1, R3 MOV R0, 288(RSP) // type MOV R1, 264(RSP) // sp MOV R2, 272(RSP) // pc MOV R3, 280(RSP) // psr ADD $16, RSP, R0 // ureg BL trap(SB) MSR $0x3, DAIFSet // interrupts off MOV 272(RSP), R2 // pc MOV 280(RSP), R3 // psr MSR R2, ELR_EL1 MSR R3, SPSR_EL1 MOV 248(RSP), R29 // special B _intrreturn // vector tables TEXT vsys(SB), 1, $-4 SUB $TRAPFRAMESIZE, RSP MOV R0, 16(RSP) MOV R30, 256(RSP) // link MOV R17, 152(RSP) // temp MRS ESR_EL1, R0 // type _vsyspatch: B _vsyspatch // branch to vsys0() patched in TEXT vtrap(SB), 1, $-4 SUB $TRAPFRAMESIZE, RSP MOVP R0, R1, 16(RSP) MOVP R2, R3, 32(RSP) MOVP R4, R5, 48(RSP) MOVP R6, R7, 64(RSP) MOVP R8, R9, 80(RSP) MOVP R10, R11, 96(RSP) MOVP R12, R13, 112(RSP) MOVP R14, R15, 128(RSP) MOVP R16, R17, 144(RSP) MOVP R18, R19, 160(RSP) MOVP R20, R21, 176(RSP) MOVP R22, R23, 192(RSP) MOVP R24, R25, 208(RSP) MOV R30, 256(RSP) // link MRS ESR_EL1, R0 // type _vtrappatch: B _vtrappatch // branch to vtrapX() patched in TEXT virq(SB), 1, $-4 SUB $TRAPFRAMESIZE, RSP MOVP R0, R1, 16(RSP) MOVP R2, R3, 32(RSP) MOVP R4, R5, 48(RSP) MOVP R6, R7, 64(RSP) MOVP R8, R9, 80(RSP) MOVP R10, R11, 96(RSP) MOVP R12, R13, 112(RSP) MOVP R14, R15, 128(RSP) MOVP R16, R17, 144(RSP) MOVP R18, R19, 160(RSP) MOVP R20, R21, 176(RSP) MOVP R22, R23, 192(RSP) MOVP R24, R25, 208(RSP) MOV R30, 256(RSP) // link MOV $(1<<32), R0 // type irq _virqpatch: B _virqpatch // branch to vtrapX() patched in TEXT vfiq(SB), 1, $-4 SUB $TRAPFRAMESIZE, RSP MOVP R0, R1, 16(RSP) MOVP R2, R3, 32(RSP) MOVP R4, R5, 48(RSP) MOVP R6, R7, 64(RSP) MOVP R8, R9, 80(RSP) MOVP R10, R11, 96(RSP) MOVP R12, R13, 112(RSP) MOVP R14, R15, 128(RSP) MOVP R16, R17, 144(RSP) MOVP R18, R19, 160(RSP) MOVP R20, R21, 176(RSP) MOVP R22, R23, 192(RSP) MOVP R24, R25, 208(RSP) MOV R30, 256(RSP) // link MOV $(2<<32), R0 // type fiq _vfiqpatch: B _vfiqpatch // branch to vtrapX() patched in TEXT vserr(SB), 1, $-4 SUB $TRAPFRAMESIZE, RSP MOVP R0, R1, 16(RSP) MOVP R2, R3, 32(RSP) MOVP R4, R5, 48(RSP) MOVP R6, R7, 64(RSP) MOVP R8, R9, 80(RSP) MOVP R10, R11, 96(RSP) MOVP R12, R13, 112(RSP) MOVP R14, R15, 128(RSP) MOVP R16, R17, 144(RSP) MOVP R18, R19, 160(RSP) MOVP R20, R21, 176(RSP) MOVP R22, R23, 192(RSP) MOVP R24, R25, 208(RSP) MOV R30, 256(RSP) // link MRS ESR_EL1, R0 ORR $(3<<32), R0 // type _vserrpatch: B _vserrpatch // branch to vtrapX() patched in /* fault-proof memcpy */ TEXT peek(SB), 1, $-4 MOV R0, R1 MOV dst+8(FP), R2 MOVWU len+16(FP), R0 TEXT _peekinst(SB), 1, $-4 _peekloop: MOVBU (R1)1!, R3 MOVBU R3, (R2)1! SUBS $1, R0 BNE _peekloop RETURN TEXT smccall(SB), 1, $32 /* save extern registers */ MOVP R26, R27, (RSP) /* R0 = Ureg */ MOV R0, R8 /* save ureg pointer */ MOV R8, 16(RSP) MOVP 0(R8), R0, R1 MOVP 16(R8), R2, R3 MOVP 32(R8), R4, R5 MOVP 48(R8), R6, R7 SMC /* restore ureg pointer */ MOV 16(RSP), R8 MOVP R0, R1, 0(R8) MOVP R2, R3, 16(R8) /* restore extern registers */ MOVP (RSP), R26, R27 RETURN