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#include "mem.h"
/*
* Entered from the boot loader with
* supervisor mode, interrupts disabled;
*/
TEXT _startup(SB), $-4
MOVW $setR12(SB), R12 /* static base (SB) */
MOVW $Mach0(SB), R13
ADD $(KSTACK-4), R13 /* leave 4 bytes for link */
MOVW $(PsrDirq|PsrDfiq|PsrMsvc), R1 /* Switch to SVC mode */
MOVW R1, CPSR
BL main(SB) /* jump to kernel */
dead:
B dead
BL _div(SB) /* hack to get _div etc loaded */
GLOBL Mach0(SB), $KSTACK
TEXT setr13(SB), $-4
MOVW 4(FP), R1
MOVW CPSR, R2
BIC $PsrMask, R2, R3
ORR R0, R3
MOVW R3, CPSR
MOVW R13, R0
MOVW R1, R13
MOVW R2, CPSR
RET
TEXT _vundcall(SB), $-4
_vund:
MOVM.DB [R0-R3], (R13)
MOVW $PsrMund, R0
B _vswitch
TEXT _vsvccall(SB), $-4
_vsvc:
MOVW.W R14, -4(R13)
MOVW CPSR, R14
MOVW.W R14, -4(R13)
BIC $PsrMask, R14
ORR $(PsrDirq|PsrDfiq|PsrMsvc), R14
MOVW R14, CPSR
MOVW $PsrMsvc, R14
MOVW.W R14, -4(R13)
B _vsaveu
TEXT _vpabcall(SB), $-4
_vpab:
MOVM.DB [R0-R3], (R13)
MOVW $PsrMabt, R0
B _vswitch
TEXT _vdabcall(SB), $-4
_vdab:
MOVM.DB [R0-R3], (R13)
MOVW $(PsrMabt+1), R0
B _vswitch
TEXT _vfiqcall(SB), $-4 /* IRQ */
_vfiq: /* FIQ */
MOVM.DB [R0-R3], (R13)
MOVW $PsrMfiq, R0
B _vswitch
TEXT _virqcall(SB), $-4 /* IRQ */
_virq:
MOVM.DB [R0-R3], (R13)
MOVW $PsrMirq, R0
_vswitch: /* switch to svc mode */
MOVW SPSR, R1
MOVW R14, R2
MOVW R13, R3
MOVW CPSR, R14
BIC $PsrMask, R14
ORR $(PsrDirq|PsrDfiq|PsrMsvc), R14
MOVW R14, CPSR
MOVM.DB.W [R0-R2], (R13)
MOVM.DB (R3), [R0-R3]
_vsaveu: /* Save Registers */
MOVW.W R14, -4(R13) /* save link */
/* MCR CpMMU, 0, R0, C(0), C(0), 0 */
SUB $8, R13
MOVM.DB.W [R0-R12], (R13)
MOVW R0, R0 /* gratuitous noop */
MOVW $setR12(SB), R12 /* static base (SB) */
MOVW R13, R0 /* argument is ureg */
SUB $8, R13 /* space for arg+lnk*/
BL trap(SB)
_vrfe: /* Restore Regs */
MOVW CPSR, R0 /* splhi on return */
ORR $(PsrDirq|PsrDfiq), R0, R1
MOVW R1, CPSR
ADD $(8+4*15), R13 /* [r0-R14]+argument+link */
MOVW (R13), R14 /* restore link */
MOVW 8(R13), R0
MOVW R0, SPSR
MOVM.DB.S (R13), [R0-R14] /* restore user registers */
MOVW R0, R0 /* gratuitous nop */
ADD $12, R13 /* skip saved link+type+SPSR*/
RFE /* MOVM.IA.S.W (R13), [R15] */
TEXT splhi(SB), $-4
MOVW CPSR, R0
ORR $(PsrDirq), R0, R1
MOVW R1, CPSR
RET
TEXT spllo(SB), $-4
MOVW CPSR, R0
BIC $(PsrDirq|PsrDfiq), R0, R1
MOVW R1, CPSR
RET
TEXT splx(SB), $-4
/* BUG - save PC in m->splpc - JB */
TEXT splxpc(SB), $-4
MOVW R0, R1
MOVW CPSR, R0
MOVW R1, CPSR
RET
TEXT islo(SB), $-4
MOVW CPSR, R0
AND $(PsrDirq), R0
EOR $(PsrDirq), R0
RET
TEXT splfhi(SB), $-4
MOVW CPSR, R0
ORR $(PsrDfiq|PsrDirq), R0, R1
MOVW R1, CPSR
RET
TEXT splflo(SB), $-4
MOVW CPSR, R0
BIC $(PsrDfiq), R0, R1
MOVW R1, CPSR
RET
TEXT cpsrr(SB), $-4
MOVW CPSR, R0
RET
TEXT spsrr(SB), $-4
MOVW SPSR, R0
RET
TEXT getcallerpc(SB), $-4
MOVW 0(R13), R0
RET
TEXT _tas(SB), $-4
MOVW R0, R1
MOVW $0xDEADDEAD, R2
SWPW R2, (R1), R0
RET
TEXT setlabel(SB), $-4
MOVW R13, 0(R0) /* sp */
MOVW R14, 4(R0) /* pc */
MOVW $0, R0
RET
TEXT gotolabel(SB), $-4
MOVW 0(R0), R13 /* sp */
MOVW 4(R0), R14 /* pc */
MOVW $1, R0
BX (R14)
TEXT outs(SB), $-4
MOVW 4(FP),R1
WORD $0xe1c010b0 /* STR H R1,[R0+0] */
RET
TEXT ins(SB), $-4
WORD $0xe1d000b0 /* LDRHU R0,[R0+0] */
RET
/* for devboot */
TEXT gotopc(SB), $-4
/*
MOVW R0, R1
MOVW bootparam(SB), R0
MOVW R1, PC
*/
RET
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