ref: aa0b6bedf4151dffec81e38b3c166aaac51c04c1
dir: /sys/src/boot/efi/aa64.s/
#define SYSREG(op0,op1,Cn,Cm,op2) SPR(((op0)<<19|(op1)<<16|(Cn)<<12|(Cm)<<8|(op2)<<5)) #define SCTLR_EL1 SYSREG(3,0,1,0,0) #define NSH (1<<2 | 3) #define NSHST (1<<2 | 2) #define SY (3<<2 | 3) TEXT start(SB), 1, $-4 _base: MOV R0, R3 MOV R1, R4 MOV $setSB(SB), R0 BL rebase(SB) MOV R0, R28 MOV $argsbuf<>(SB), R0 MOV R0, confaddr(SB) MOV R3, R0 MOV R4, 0x08(FP) B efimain(SB) TEXT rebase(SB), 1, $-4 ADR _base, R1 SUB $0x8200, R0 ADD R1, R0 RETURN TEXT eficall(SB), 1, $-4 MOV R0, R8 MOV 0x08(FP), R0 MOV 0x10(FP), R1 MOV 0x18(FP), R2 MOV 0x20(FP), R3 MOV 0x28(FP), R4 MOV 0x30(FP), R5 MOV 0x38(FP), R6 MOV 0x40(FP), R7 B (R8) 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 DSB $NSHST TLBI R0, 0,8,7,0 /* VMALLE1 */ DSB $NSH ISB $SY RETURN TEXT jump(SB), 1, $-4 MOV R0, R3 MOV R1, R4 BL mmudisable<>(SB) MOV R4, R0 B (R3) GLOBL confaddr(SB), $8 GLOBL argsbuf<>(SB), $0x1000