ref: 4d69aacea023546a7150d92e147e531c38de822f
dir: /sys/src/9/bcm/rebootcode.s/
/* * armv6/armv7 reboot code */ #include "arm.s" #define WFI WORD $0xe320f003 /* wait for interrupt */ #define WFE WORD $0xe320f002 /* wait for event */ TEXT main(SB), 1, $-4 MOVW $setR12(SB), R12 MOVW R0, entry+0(FP) CMP $0, R0 BEQ shutdown MOVW entry+0(FP), R8 MOVW code+4(FP), R9 MOVW size+8(FP), R6 /* round to words */ BIC $3, R8 BIC $3, R9 ADD $3, R6 BIC $3, R6 memloop: MOVM.IA.W (R9), [R1] MOVM.IA.W [R1], (R8) SUB.S $4, R6 BNE memloop shutdown: /* clean dcache using appropriate code for armv6 or armv7 */ MRC CpSC, 0, R1, C(CpID), C(CpIDfeat), 7 /* Memory Model Feature Register 3 */ TST $0xF, R1 /* hierarchical cache maintenance? */ BNE l2wb DSB MOVW $0, R0 MCR CpSC, 0, R0, C(CpCACHE), C(CpCACHEwb), CpCACHEall B l2wbx l2wb: BL cachedwb(SB) BL l2cacheuwb(SB) l2wbx: /* load entry before turning off mmu */ MOVW entry+0(FP), R8 /* disable caches */ MRC CpSC, 0, R1, C(CpCONTROL), C(0), CpMainctl BIC $(CpCdcache|CpCicache|CpCpredict), R1 MCR CpSC, 0, R1, C(CpCONTROL), C(0), CpMainctl BARRIERS /* invalidate icache */ MOVW $0, R0 MCR CpSC, 0, R0, C(CpCACHE), C(CpCACHEinvi), CpCACHEall BARRIERS /* turn off mmu */ MRC CpSC, 0, R1, C(CpCONTROL), C(0), CpMainctl BIC $CpCmmu, R1 MCR CpSC, 0, R1, C(CpCONTROL), C(0), CpMainctl BARRIERS /* turn SMP off */ MRC CpSC, 0, R1, C(CpCONTROL), C(0), CpAuxctl BIC $CpACsmp, R1 MCR CpSC, 0, R1, C(CpCONTROL), C(0), CpAuxctl ISB DSB /* have entry? */ CMP $0, R8 BNE bootcpu /* other cpus wait for inter processor interrupt */ CPUID(R2) dowfi: WFE /* wait for event signal */ MOVW $0x400000CC, R1 /* inter-core .startcpu mailboxes */ ADD R2<<4, R1 /* mailbox for this core */ MOVW 0(R1), R8 /* content of mailbox */ CMP $0, R8 BEQ dowfi /* if zero, wait again */ bootcpu: MOVW $0, R2 /* no ATAGS/DTB pointer */ BIC $KSEGM, R8 /* entry to physical */ ORR $PHYSDRAM, R8 BL (R8) B dowfi #define ICACHELINESZ 32 #include "cache.v7.s"