imx8: implement /dev/reboot support
This commit is contained in:
cinap_lenrek
parent
414cefcb0b
commit
32183b1abf
5 changed files with 130 additions and 6 deletions
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@ -10,6 +10,8 @@
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#include "sysreg.h"
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#include "ureg.h"
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#include "rebootcode.i"
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Conf conf;
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/*
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@ -124,7 +126,7 @@ mpinit(void)
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MACHP(i)->machno = i;
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cachedwbinvse(MACHP(i), MACHSIZE);
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u.r0 = 0x84000003;
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u.r0 = 0x84000003; /* CPU_ON */
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u.r1 = (sysrd(MPIDR_EL1) & ~0xFF) | i;
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u.r2 = PADDR(_start);
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u.r3 = i;
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@ -188,12 +190,13 @@ main(void)
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void
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exit(int)
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{
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Ureg u = { .r0 = 0x84000009 };
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Ureg u = { .r0 = 0x84000002 }; /* CPU_OFF */
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cpushutdown();
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splfhi();
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/* system reset */
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if(m->machno == 0)
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u.r0 = 0x84000009; /* SYSTEM RESET */
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smccall(&u);
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}
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@ -214,9 +217,54 @@ writeconf(void)
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{
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}
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void
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reboot(void *, void *, ulong)
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static void
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rebootjump(void *entry, void *code, ulong size)
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{
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void (*f)(void*, void*, ulong);
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intrcpushutdown();
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/* redo identity map */
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mmuidmap((uintptr*)L1);
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/* setup reboot trampoline function */
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f = (void*)REBOOTADDR;
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memmove(f, rebootcode, sizeof(rebootcode));
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cachedwbinvse(f, sizeof(rebootcode));
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cacheiinvse(f, sizeof(rebootcode));
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(*f)(entry, code, size);
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for(;;);
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}
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void
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reboot(void*, void *code, ulong size)
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{
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writeconf();
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while(m->machno != 0){
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procwired(up, 0);
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sched();
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}
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cpushutdown();
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delay(2000);
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splfhi();
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/* turn off buffered serial console */
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serialoq = nil;
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/* shutdown devices */
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chandevshutdown();
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/* stop the clock */
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clockshutdown();
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intrsoff();
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/* off we go - never to return */
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rebootjump((void*)(KTZERO-KZERO), code, size);
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}
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void
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@ -44,7 +44,7 @@
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#define UCRAMSIZE (8*MiB)
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#define VDRAM (0xFFFFFFFFC0000000ULL) /* 0x40000000 - 0x80000000 */
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#define KTZERO (VDRAM + 0x100000) /* kernel text start */
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#define KTZERO (VDRAM + 0x100000) /* 0x40100000 - kernel text start */
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#define ARMLOCAL (0xFFFFFFFFB1000000ULL) /* 0x31000000 */
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#define VIRTIO (0xFFFFFFFFB0000000ULL) /* 0x30000000 */
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@ -64,6 +64,9 @@
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#define MACHADDR(n) (KTZERO-((n)+1)*MACHSIZE)
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#define CONFADDR (VDRAM + 0x10000) /* 0x40010000 */
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#define REBOOTADDR (0x40020000) /* 0x40020000 */
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#define UZERO 0ULL /* user segment */
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#define UTZERO (UZERO+0x10000) /* user text start */
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#define USTKTOP ((EVAMASK>>1)-0xFFFF) /* user segment end +1 */
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@ -87,8 +87,15 @@ install:V: /$objtype/$p$CONF
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<../port/portmkfile
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<|../port/mkbootrules $CONF
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main.$O: rebootcode.i
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pciimx.$O: ../port/pci.h
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initcode.out: init9.$O initcode.$O /$objtype/lib/libc.a
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$LD -l -R1 -s -o $target $prereq
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rebootcode.out: rebootcode.$O cache.v8.$O
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$LD -l -H6 -R1 -T0x40020000 -s -o $target $prereq
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$CONF.clean:
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rm -rf $p$CONF $p$CONF.u errstr.h $CONF.c boot$CONF.c
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@ -60,6 +60,24 @@ mmu0clear(uintptr *l1)
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l1[PTL1X(pa, 3)] = 0;
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}
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void
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mmuidmap(uintptr *l1)
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{
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uintptr va, pa, pe;
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pe = -VDRAM;
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for(pa = VDRAM - KZERO, va = VDRAM; pa < pe; pa += PGLSZ(1), va += PGLSZ(1))
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l1[PTL1X(pa, 1)] = l1[PTL1X(va, 1)];
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if(PTLEVELS > 2)
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for(pa = VDRAM - KZERO, va = VDRAM; pa < pe; pa += PGLSZ(2), va += PGLSZ(2))
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l1[PTL1X(pa, 2)] = l1[PTL1X(va, 2)];
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if(PTLEVELS > 3)
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for(pa = VDRAM - KZERO, va = VDRAM; pa < pe; pa += PGLSZ(3), va += PGLSZ(3))
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l1[PTL1X(pa, 3)] = l1[PTL1X(va, 3)];
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setttbr(PADDR(&l1[L1TABLEX(0, PTLEVELS-1)]));
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flushtlb();
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}
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void
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mmu1init(void)
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{
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48
sys/src/9/imx8/rebootcode.s
Normal file
48
sys/src/9/imx8/rebootcode.s
Normal file
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@ -0,0 +1,48 @@
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#include "mem.h"
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#include "sysreg.h"
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#undef SYSREG
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#define SYSREG(op0,op1,Cn,Cm,op2) SPR(((op0)<<19|(op1)<<16|(Cn)<<12|(Cm)<<8|(op2)<<5))
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TEXT _start(SB), 1, $-4
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MOV $setSB(SB), R28
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MOV R0, R27
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MOV code+8(FP), R1
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MOVWU size+16(FP), R2
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BIC $3, R2
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ADD R1, R2, R3
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_copy:
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MOVW (R1)4!, R4
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MOVW R4, (R0)4!
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CMP R1, R3
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BNE _copy
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BL cachedwbinv(SB)
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BL l2cacheuwbinv(SB)
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ISB $SY
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MRS SCTLR_EL1, R0
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BIC $(1<<0 | 1<<2 | 1<<12), R0
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ISB $SY
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MSR R0, SCTLR_EL1
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ISB $SY
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DSB $NSHST
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TLBI R0, 0,8,7,0 /* VMALLE1 */
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DSB $NSH
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ISB $SY
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BL cachedwbinv(SB)
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BL cacheiinv(SB)
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MOVWU $0, R0
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MOVWU $0, R1
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MOVWU $0, R2
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MOVWU $0, R3
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MOV R27, LR
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RETURN
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