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- #include "mem.h"
- /*
- * Entered here from Compaq's bootldr. First relocate to
- * the location we're linked for and then copy back the
- * decompressed kernel.
- *
- * All
- */
- TEXT _start(SB), $-4
- MOVW $setR12(SB), R12 /* load the SB */
- MOVW $1, R0 /* dance to make 5l think that the magic */
- MOVW $1, R1 /* numbers in WORDs below are being used */
- CMP.S R0, R1 /* and to align them to where bootldr wants */
- BEQ _start2
- WORD $0x016f2818 /* magic number to say we are a kernel */
- WORD $0xc0008000 /* entry point address */
- WORD $0 /* size?, or end of data? */
- _start2:
- /* SVC mode, interrupts disabled */
- MOVW $(PsrDirq|PsrDfiq|PsrMsvc), R1
- MOVW R1, CPSR
- /* disable the MMU */
- MOVW $0x130, R1
- MCR CpMMU, 0, R1, C(CpControl), C(0x0)
- /* enable caches */
- MRC CpMMU, 0, R0, C(CpControl), C(0x0)
- ORR $(CpCdcache|CpCicache|CpCwb), R0
- MCR CpMMU, 0, R0, C(CpControl), C(0x0)
- /* flush caches */
- MCR CpMMU, 0, R0, C(CpCacheFlush), C(0x7), 0
- /* drain prefetch */
- MOVW R0,R0
- MOVW R0,R0
- MOVW R0,R0
- MOVW R0,R0
- /* drain write buffer */
- MCR CpMMU, 0, R0, C(CpCacheFlush), C(0xa), 4
- /* relocate to where we expect to be */
- MOVW $(512*1024),R3
- MOVW $0xC0008000,R1
- MOVW $0xC0200000,R2
- ADD R1,R3
- _relloop:
- MOVW (R1),R0
- MOVW R0,(R2)
- ADD $4,R1
- ADD $4,R2
- CMP.S R1,R3
- BNE _relloop
- MOVW $(MACHADDR+BY2PG), R13 /* stack */
- SUB $4, R13 /* link */
- /* jump to where we've been relocated */
- MOVW $_relocated(SB),R15
- TEXT _relocated(SB),$-4
- BL main(SB)
- BL exit(SB)
- /* we shouldn't get here */
- _mainloop:
- B _mainloop
- BL _div(SB) /* hack to get _div etc loaded */
- TEXT mypc(SB),$-4
- MOVW R14,R0
- RET
- TEXT draincache(SB),$-4
- /* write back any dirty data */
- MOVW $0xe0000000,R0
- ADD $(8*1024),R0,R1
- _cfloop:
- MOVW.P 32(R0),R2
- CMP.S R0,R1
- BNE _cfloop
-
- /* drain write buffer and invalidate i&d cache contents */
- MCR CpMMU, 0, R0, C(CpCacheFlush), C(0xa), 4
- MCR CpMMU, 0, R0, C(CpCacheFlush), C(0x7), 0
- /* drain prefetch */
- MOVW R0,R0
- MOVW R0,R0
- MOVW R0,R0
- MOVW R0,R0
- /* disable caches */
- MRC CpMMU, 0, R0, C(CpControl), C(0x0)
- BIC $(CpCdcache|CpCicache|CpCwb), R0
- MCR CpMMU, 0, R0, C(CpControl), C(0x0)
- RET
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