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[crt0] cleanup multicore launch code

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stnolting 2025-01-07 21:36:48 +01:00
parent 259b68ed6b
commit f75710888b
1 changed files with 8 additions and 12 deletions
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20
sw/common/crt0.S
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@ -92,23 +92,19 @@ __crt0_multicore_wakeup:
add x14, x14, x15
sw zero, 0(x14) // CLINT.MSWI[hart_id]
csrr x14, mcause
li x15, 0x80000003 // is machine software interrupt?
bne x14, x15, __crt0_multicore_exit // go back to sleep if not
// get launch configuration from core 0
// check launch configuration from core 0
csrw 0xbc2, zero // ICC.SR: link select = 0
csrr x13, 0xbc0 // ICC.RX: signature
li x14, 0xffab4321 // expected signature
bne x14, x13, __crt0_multicore_exit // abort if incorrect signature
beq x14, x13, __crt0_multicore_launch
mret // go back to sleep if incorrect signature
// get launch configuration from core 0
__crt0_multicore_launch:
csrw 0xbc1, x14 // ICC.TX: acknowledge start
csrr x2, 0xbc0 // ICC.RX: stack_top -> sp
csrr x12, 0xbc0 // ICC.RX: entry_point
j __crt0_main_entry // start main function
__crt0_multicore_exit:
mret // go back to sleep
csrr x2, 0xbc0 // ICC.RX: stack top -> sp
csrr x12, 0xbc0 // ICC.RX: entry point
j __crt0_main_entry // start at entry point
__crt0_multicore_primary:
#endif