ref: b548687a8ed1d0a159c9d3f3f921d93bbb56908e
dir: /os/manga/l.s/
#include "mem.h" #define CPWAIT /* * Entered here from the boot loader with * supervisor mode, interrupts disabled; * MMU and caches disabled */ #define LED \ MOVW $(PHYSGPIO+8), R6;\ MOVW (R6), R7;\ EOR $(1<<12), R7;\ MOVW R7, (R6) TEXT _startup(SB), $-4 MOVW $setR12(SB), R12 /* static base (SB) */ MOVW $(PsrDirq|PsrDfiq|PsrMsvc), R1 /* ensure SVC mode with interrupts disabled */ MOVW R1, CPSR /* build a temporary translation table at 4MB */ MOVW $0x400000, R0 MCR CpMMU, 0, R0, C(CpTTB), C(0), 0 /* set TTB */ MOVW $4096, R1 MOVW $0, R3 ORR $(1<<4), R3 /* must be one */ ORR $(3<<10), R3 /* supervisor rw */ ORR $(2<<0), R3 /* section */ startup0: BIC $0xFC000000, R3 /* wraps round, at least for 0xC00... */ MOVW R3, (R0) ADD $4, R0 ADD $(1<<20), R3 SUB $1, R1 CMP $0, R1 BNE startup0 MRC CpMMU, 0, R0, C(CpControl), C(0), 0 ORR $CpCmmu, R0 MOVW $3, R1 MCR CpMMU, 0, R1, C(CpDAC), C(0) /* set domain 0 to manager */ BL mmuenable(SB) MOVW $(MACHADDR+BY2PG-4), R13 /* stack; 4 bytes for link */ BL _relocate(SB) BL main(SB) dead: B dead BL _div(SB) /* hack to get _div etc loaded */ TEXT _relocate(SB), $-4 ORR $KZERO, R14 RET TEXT getcpuid(SB), $-4 MRC CpMMU, 0, R0, C(CpCPUID), C(0) RET TEXT getcacheid(SB), $-4 MRC CpMMU, 0, R0, C(CpCacheID), C(1) RET TEXT mmugetctl(SB), $-4 MRC CpMMU, 0, R0, C(CpControl), C(0) RET TEXT mmugetdac(SB), $-4 MRC CpMMU, 0, R0, C(CpDAC), C(0) RET TEXT mmugetfar(SB), $-4 MRC CpMMU, 0, R0, C(CpFAR), C(0) RET TEXT mmugetfsr(SB), $-4 MRC CpMMU, 0, R0, C(CpFSR), C(0) RET TEXT mmuputdac(SB), $-4 MCR CpMMU, 0, R0, C(CpDAC), C(0) CPWAIT RET TEXT mmuputfsr(SB), $-4 MCR CpMMU, 0, R0, C(CpFSR), C(0) CPWAIT RET TEXT mmuputttb(SB), $-4 MCR CpMMU, 0, R0, C(CpTTB), C(0) CPWAIT RET TEXT mmuputctl(SB), $-4 MCR CpMMU, 0, R0, C(CpControl), C(0) /* drain prefetch */ MOVW R0,R0 MOVW R0,R0 RET TEXT tlbinvalidateall(SB), $-4 MCR CpMMU, 0, R0, C(CpTLBops), C(7) CPWAIT RET TEXT itlbinvalidate(SB), $-4 MCR CpMMU, 0, R0, C(CpTLBops), C(5), 1 CPWAIT RET TEXT dtlbinvalidate(SB), $-4 MCR CpMMU, 0, R0, C(CpTLBops), C(6), 1 CPWAIT RET TEXT mmuenable(SB), $-4 /* disable and invalidate all caches and TLB's before enabling MMU */ MCR CpMMU, 0, R1, C(CpControl), C(0) BIC $(CpCDcache | CpCIcache), R1 MRC CpMMU, 0, R1, C(CpControl), C(0) CPWAIT MOVW $0, R1 /* disable everything */ MCR CpMMU, 0, R1, C(CpCacheCtl), C(7), 0 /* invalidate I&D Caches and BTB */ MCR CpMMU, 0, R1, C(CpCacheCtl), C(10), 4 /* drain write buffer */ MCR CpMMU, 0, R1, C(CpTLBops), C(7), 0 /* invalidate I&D TLB */ /* enable desired mmu mode (R0) */ MCR CpMMU, 0, R0, C(CpControl), C(0) /* drain prefetch */ MOVW R0,R0 MOVW R0,R0 RET /* start running in remapped area */ 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 vectors(SB), $-4 MOVW 0x18(R15), R15 /* reset */ MOVW 0x18(R15), R15 /* undefined */ MOVW 0x18(R15), R15 /* SWI */ MOVW 0x18(R15), R15 /* prefetch abort */ MOVW 0x18(R15), R15 /* data abort */ MOVW 0x18(R15), R15 /* reserved */ MOVW 0x18(R15), R15 /* IRQ */ MOVW 0x18(R15), R15 /* FIQ */ TEXT vtable(SB), $-4 WORD $_vsvc(SB) /* reset, in svc mode already */ WORD $_vund(SB) /* undefined, switch to svc mode */ WORD $_vsvc(SB) /* swi, in svc mode already */ WORD $_vpab(SB) /* prefetch abort, switch to svc mode */ WORD $_vdab(SB) /* data abort, switch to svc mode */ WORD $_vsvc(SB) /* reserved */ WORD $_virq(SB) /* IRQ, switch to svc mode */ WORD $_vfiq(SB) /* FIQ, switch to svc mode */ TEXT _vund(SB), $-4 MOVM.DB [R0-R3], (R13) MOVW $PsrMund, R0 B _vswitch TEXT _vsvc(SB), $-4 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 _vpab(SB), $-4 MOVM.DB [R0-R3], (R13) MOVW $PsrMabt, R0 B _vswitch TEXT _vdab(SB), $-4 MOVM.DB [R0-R3], (R13) MOVW $(PsrMabt+1), R0 B _vswitch TEXT _vfiq(SB), $-4 /* FIQ */ MOVM.DB [R0-R3], (R13) MOVW $PsrMfiq, R0 B _vswitch TEXT _virq(SB), $-4 /* IRQ */ 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 MOVW $(MACHADDR), R6 MOVW R14, (R6) /* m->splpc */ RET TEXT spllo(SB), $-4 MOVW CPSR, R0 BIC $(PsrDirq|PsrDfiq), R0, R1 MOVW R1, CPSR RET TEXT splx(SB), $-4 MOVW $(MACHADDR), R6 MOVW R14, (R6) /* m->splpc */ TEXT splxpc(SB), $-4 MOVW R0, R1 MOVW CPSR, R0 MOVW R1, CPSR RET TEXT spldone(SB), $-4 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 getcpsr(SB), $-4 MOVW CPSR, R0 RET TEXT getspsr(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 RET /* * flush (invalidate) the whole icache */ TEXT icflushall(SB), $-4 _icflushall: MCR CpMMU, 0, R0, C(CpCacheCtl), C(5), 0 /* invalidate i-cache */ CPWAIT RET /* * invalidate part of i-cache */ TEXT icflush(SB), $-4 MOVW 4(FP), R1 CMP $(CACHESIZE/2), R1 BGE _icflushall /* might as well do the lot */ ADD R0, R1 BIC $(CACHELINESZ-1), R0 icflush1: MCR CpMMU, 0, R0, C(CpCacheCtl), C(5), 1 /* invalidate entry by address */ ADD $CACHELINESZ, R0 CMP R1, R0 BLO icflush1 RET /* * write back whole data cache, invalidate, and drain write buffer */ TEXT dcflushall(SB), $-4 _dcflushall: MOVW $(63<<26), R1 /* index, segment 0 */ dcflushall0: MCR CpMMU, 0, R1, C(CpCacheCtl), C(14), 2 /* clean and invalidate, using index */ ADD $(1<<5), R1 /* segment 1 */ MCR CpMMU, 0, R1, C(CpCacheCtl), C(14), 2 ADD $(1<<5), R1 /* segment 2 */ MCR CpMMU, 0, R1, C(CpCacheCtl), C(14), 2 ADD $(1<<5), R1 /* segment 3 */ MCR CpMMU, 0, R1, C(CpCacheCtl), C(14), 2 EOR $(3<<5), R1 /* back to 0 */ SUB.S $(1<<26), R1 BCS dcflushall0 MCR CpMMU, 0, R0, C(CpCacheCtl), C(10), 4 /* drain write buffer */ CPWAIT RET /* * write back a given region, inavlidate it, and drain write buffer */ TEXT dcflush(SB), $-4 MOVW 4(FP), R1 CMP $(CACHESIZE/2), R1 BGE _dcflushall ADD R0, R1 BIC $(CACHELINESZ-1), R0 dcflush1: MCR CpMMU, 0, R0, C(CpCacheCtl), C(14), 1 /* clean and invalidate entry by address */ ADD $CACHELINESZ, R0 CMP R1, R0 BLO dcflush1 MCR CpMMU, 0, R0, C(CpCacheCtl), C(10), 4 /* drain write buffer */ CPWAIT RET /* * invalidate data cache */ TEXT dcinval(SB), $-4 MCR CpMMU, 0, R0, C(CpCacheCtl), C(6), 0 CPWAIT RET /* for devboot */ TEXT gotopc(SB), $-4 MOVW R0, R1 MOVW $0, R0 MOVW R1, PC RET TEXT idle(SB), $-4 MCR CpMMU, 0, R0, C(7), C(0), 4 RET