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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2019-11-06 13:55:54 +1100 |
|---|---|---|
| committer | Alexey Kardashevskiy <aik@ozlabs.ru> | 2019-11-11 15:40:15 +1100 |
| commit | f9661a257028e49f8fcae77b7cc59d41f4983195 (patch) | |
| tree | 45c3184c087acebd14e8224d6c4bf9d03570068b /slof | |
| parent | 73dea09dae61ea78364b6761f891023c990957fa (diff) | |
| download | SLOF-f9661a257028e49f8fcae77b7cc59d41f4983195.zip SLOF-f9661a257028e49f8fcae77b7cc59d41f4983195.tar.gz SLOF-f9661a257028e49f8fcae77b7cc59d41f4983195.tar.bz2 | |
client: Load initramdisk location
For ages both vmlinux and zImage accepted the initramdisk location
in r3/r4 [1] [2]. If r3==r4==0, vmlinux looks at the device tree for
/chosen/linux,initrd-{start|end} but zImage does not so the QEMU user
can only pass vmlinux via -kernel if -initrd is passed as well.
This initializes r3/r4 to point to the initramdisk location when present.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/powerpc/kernel/prom_init.c?h=v5.3#n3230
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/powerpc/boot/of.c?h=v5.3#n89
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
Changes:
v2:
* improved readability
Diffstat (limited to 'slof')
| -rw-r--r-- | slof/fs/client.fs | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/slof/fs/client.fs b/slof/fs/client.fs index 8a7f6ac..db7a192 100644 --- a/slof/fs/client.fs +++ b/slof/fs/client.fs @@ -45,6 +45,14 @@ VARIABLE client-callback \ Address of client's callback function >r ciregs >r7 ! ciregs >r6 ! client-entry-point @ ciregs >r5 ! \ Initialise client-stack-pointer cistack ciregs >r1 ! + + s" linux,initrd-end" get-chosen IF decode-int nip nip ELSE 0 THEN + s" linux,initrd-start" get-chosen IF decode-int nip nip ELSE 0 THEN + ( end start ) + tuck - ( start len ) + ciregs >r4 ! + ciregs >r3 ! + \ jump-client maps to call_client in slof/entry.S \ When jump-client returns, R3 holds the address of a NUL-terminated string \ that holds the client interface word the client wants to call, R4 holds |