diff options
Diffstat (limited to 'purgatory/arch')
| -rw-r--r-- | purgatory/arch/ppc64/v2wrap.S | 61 |
1 files changed, 17 insertions, 44 deletions
diff --git a/purgatory/arch/ppc64/v2wrap.S b/purgatory/arch/ppc64/v2wrap.S index 7514d68..b3563de 100644 --- a/purgatory/arch/ppc64/v2wrap.S +++ b/purgatory/arch/ppc64/v2wrap.S @@ -45,13 +45,22 @@ oris rn,rn,name##@h; \ ori rn,rn,name##@l -# look a bit like a Linux kernel here ... + .machine ppc64 .globl purgatory_start purgatory_start: b master - tweq 0,0 + .org purgatory_start + 0x60 # ABI: slaves start at 60 with r3=phys +slave: b $ + .org purgatory_start + 0x100 # ABI: end of copied region + .size purgatory_start, . - purgatory_start + +# +# The above 0x100 bytes at purgatory_start are replaced with the +# code from the kernel (or next stage) by kexec/arch/ppc64/kexec-ppc64.c +# + master: - or 1,1,1 # low priority to let other thread catchup + or 1,1,1 # low priority to let other threads catchup isync mr 17,3 # save cpu id to r17 mr 15,4 # save physical address in reg15 @@ -66,25 +75,7 @@ master: bl .purgatory nop - b 81f - .org purgatory_start + 0x60 # ABI: slaves start at 60 with r3=phys -slave: - # load slave spin code address and branch into that - LOADADDR(6,slave_spin) - ld 4,0(6) - mtctr 4 - bctr - -spin: .long 1 -slave_spin_code: - lis 5,spin@ha - lwz 5,spin@l(5) - cmpwi 0,5,0 - bne slave_spin_code - ba 0x60 - -81: # master continues here - or 3,3,3 # ok back to high, lets boot + or 3,3,3 # ok now to high priority, lets boot lis 6,0x1 mtctr 6 # delay a bit for slaves to catch up 83: bdnz 83b # before we overwrite 0-100 again @@ -99,30 +90,12 @@ slave_spin_code: 80: LOADADDR(6,kernel) ld 4,0(6) # load the kernel address - - addi 5,4,-8 # prepare copy with update form instructions - li 6,0x100/8 - mtctr 6 - li 6,-8 -85: ldu 7,8(5) - stdu 7,8(6) - bdnz 85b - li 5,0 # r5 will be 0 for kernel - dcbst 0,5 # store dcache, flush icache - dcbst 0,6 # 0 and 0xf8 covers us with 128 byte lines mtctr 4 # prepare branch too - sync - icbi 0,5 - icbi 0,6 - sync - isync - lis 6,spin@ha - li 0,0 - stw 0,spin@l(6) mr 3,16 # restore dt address - bctr # start kernel - -slave_spin: .llong slave_spin_code + lwz 7,0(4) # get the first instruction that we stole + stw 7,0(0) # and put it in the slave loop at 0 + # skip cache flush, do we care? + bctr # start kernel |