diff options
| author | Milton Miller <miltonm@bga.com> | 2009-01-02 15:04:42 -0600 |
|---|---|---|
| committer | Simon Horman <horms@verge.net.au> | 2009-01-16 09:41:05 +1100 |
| commit | 79c650e757561b03163da73dfc367f702248ef98 (patch) | |
| tree | 0ec07bffcd15fc82242ff9bc553ebcb023999ec2 /purgatory/arch | |
| parent | e8f2de09b52c3f4e23f907a6f6bf837b1f45af50 (diff) | |
ppc64: update kdump for 2.6.28 relocatable kernel
The kernel updated its ABI to tell the relocatable kernel to run
where it was loaded.
We now need to set a flag in the kernel image. Since we only have
the kernel image avialable as const data to kexec-tools c code, set
the flag in the copy we put in purgatory, and have it set the flag
in the kernel (after purgatory has run its checksum). To simplfy
the purgatory code we can always copy the flag word back to the
kernel as the c code made a copy of the original flag value.
Signed-off-by: Milton Miller <miltonm@bga.com>
Tested-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Diffstat (limited to 'purgatory/arch')
| -rw-r--r-- | purgatory/arch/ppc64/v2wrap.S | 21 |
1 files changed, 9 insertions, 12 deletions
diff --git a/purgatory/arch/ppc64/v2wrap.S b/purgatory/arch/ppc64/v2wrap.S index f69dad2..3f78620 100644 --- a/purgatory/arch/ppc64/v2wrap.S +++ b/purgatory/arch/ppc64/v2wrap.S @@ -45,11 +45,14 @@ oris rn,rn,name##@h; \ ori rn,rn,name##@l -#define KDUMP_SIGNATURE 0xfeed1234 - .machine ppc64 .globl purgatory_start purgatory_start: b master + .org purgatory_start + 0x5c # ABI: possible run_at_load flag at 0x5c + .globl run_at_load +run_at_load: + .long 0 + .size run_at_load, . - run_at_load .org purgatory_start + 0x60 # ABI: slaves start at 60 with r3=phys slave: b $ .org purgatory_start + 0x100 # ABI: end of copied region @@ -57,7 +60,7 @@ slave: b $ # # 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 +# code from the kernel (or next stage) by kexec/arch/ppc64/kexec-elf-ppc64.c # master: @@ -65,7 +68,6 @@ master: isync mr 17,3 # save cpu id to r17 mr 15,4 # save physical address in reg15 - mr 18,6 # save kdump flag in reg18 LOADADDR(6,my_toc) ld 2,0(6) #setup toc @@ -92,18 +94,13 @@ master: 80: LOADADDR(6,kernel) ld 4,0(6) # load the kernel address + LOADADDR(6,run_at_load) # the load flag + lwz 7,0(6) # possibly patched by kexec-elf-ppc64 + stw 7,0x5c(4) # and patch it into the kernel li 5,0 # r5 will be 0 for kernel mtctr 4 # prepare branch too mr 3,16 # restore dt address - LOADADDR(6,KDUMP_SIGNATURE) - cmpd 18,6 - bne regular - li 7,1 - std 7,24(4) # mark kdump flag at kernel -regular: - 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 |