ref: a7b1ab8236b7ccd41e96e9e4008cbc3213294724
dir: sitara/reloc.s
#include "mem.h" #include "io.h" #define WDT_BASE 0x44E35000 #define WDT_WWPS (WDT_BASE+0x34) #define WDT_WSPR (WDT_BASE+0x48) #define LOAD_ADDR (KTZERO-0x20) TEXT _setup(SB), $-4 // disable wdt MOVW $WDT_WSPR, R0 MOVW $0xAAAA, R1 MOVW R1, (R0) MOVW $WDT_WWPS, R0 _wdtpoll1: MOVW (R0), R1 AND $0x10, R1 CMP $0, R1 BNE _wdtpoll1 MOVW $WDT_WSPR, R0 MOVW $0x5555, R1 MOVW R1, (R0) MOVW $WDT_WWPS, R0 _wdtpoll2: MOVW (R0), R1 AND $0x10, R1 CMP $0, R1 BNE _wdtpoll2 // turn off mmu and caches MRC 15, 0, R0, C(1), C(0), 0 AND $0x8fffeff8, R0 //ORR $0x20000000, R0 BIC $(1<<12), R0 // disable icache BIC $(1<<2), R0 // disable dcache MCR 15, 0, R0, C(1), C(0), 0 BL l1dclear(SB) // relocate initialised data segment // R1: s1, R2: s2, R3: e1, R4: e2 MOVW $(LOAD_ADDR+1*4), R0 MOVBU.P 1(R0), R6 MOVW R6<<24, R1 MOVBU.P 1(R0), R6 ORR R6<<16, R1 MOVBU.P 1(R0), R6 ORR R6<<8, R1 MOVBU.P 1(R0), R6 ORR R6, R1 ADD $(KTZERO), R1 ADD $0xfff, R1, R2 AND $~0xfff, R2 MOVW $(LOAD_ADDR+2*4), R0 MOVBU.P 1(R0), R6 MOVW R6<<24, R3 MOVBU.P 1(R0), R6 ORR R6<<16, R3 MOVBU.P 1(R0), R6 ORR R6<<8, R3 MOVBU.P 1(R0), R6 ORR R6, R3 ADD R2, R3, R4 MOVW R4, R5 ADD R1, R3 _movedata: MOVW.P -4(R3), R0 MOVW.P R0, -4(R4) CMP.S R1, R3 BNE _movedata // clear bss MOVW $(LOAD_ADDR+3*4), R0 MOVBU.P 1(R0), R6 MOVW R6<<24, R1 MOVBU.P 1(R0), R6 ORR R6<<16, R1 MOVBU.P 1(R0), R6 ORR R6<<8, R1 MOVBU.P 1(R0), R6 ORR R6, R1 ADD R1, R5, R2 ADD $0x1000, R2 MOVW $0, R0 _clrbss: MOVW.P R0, 4(R5) CMP.S R5, R2 BGE _clrbss // jump to start of kernel MOVW $(LOAD_ADDR+5*4), R0 MOVBU.P 1(R0), R6 MOVW R6<<24, R1 MOVBU.P 1(R0), R6 ORR R6<<16, R1 MOVBU.P 1(R0), R6 ORR R6<<8, R1 MOVBU.P 1(R0), R6 ORR R6, R1 B (R1)