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Re: [qemu-s390x] [kvm-unit-tests PATCH 1/5] s390x: Make tests bootable f
Re: [qemu-s390x] [kvm-unit-tests PATCH 1/5] s390x: Make tests bootable from disk
Wed, 5 Dec 2018 11:17:42 +0100
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On 04.12.18 15:06, David Hildenbrand wrote:
> On 04.12.18 14:58, Janosch Frank wrote:
>> On 04.12.18 14:52, David Hildenbrand wrote:
>>> On 04.12.18 14:48, Janosch Frank wrote:
>>>> Currently tests are run with the --kernel option of Qemu, which will
>>>> load the ELF file and jump to the start address. When booting from
>>>> disk, we need to specify a start address. This is done by setting the
>>>> initial short PSW at 0x0.
>>>> For later compatibility with other hypervisors the short psw has 31
>>>> bit addressing specified.
>>>> Signed-off-by: Janosch Frank <address@hidden>
>>>> s390x/cstart64.S | 9 +++++++--
>>>> s390x/flat.lds | 8 +++++++-
>>>> 2 files changed, 14 insertions(+), 3 deletions(-)
>>>> diff --git a/s390x/cstart64.S b/s390x/cstart64.S
>>>> index dc7ddd6..abd6b58 100644
>>>> --- a/s390x/cstart64.S
>>>> +++ b/s390x/cstart64.S
>>>> @@ -14,12 +14,17 @@
>>>> .section .init
>>>> -/* entry point - for KVM + TCG we directly start in 64 bit mode */
>>>> + * Short init between 0x10000 and 0x10480 and then jump to 0x11000.
>>>> + * 0x10480 - 0x11000 are written to by bootloader.
>>>> + */
>>>> .globl start
>>>> + sam64 # Set addressing mode to 64 bit
>>> I guess this was supposed to go into patch #2?
>> No, the short PSW has only BA set because we want to boot on lpar and
>> zvm later on and they start with esam, not esame.
>> So when booting from disk we need to sam64, as we'll run with 31 at this
>> point in time.
> Please add that to the description (and remove it from the description
> of patch #2). Thanks!
Sure, I'll also try to add some more comments to the assembly.
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[qemu-s390x] [kvm-unit-tests PATCH 2/5] s390x: Switch to z/Arch if needed, Janosch Frank, 2018/12/04
[qemu-s390x] [kvm-unit-tests PATCH 3/5] s390x: Add BSS clearing for non ELF boot, Janosch Frank, 2018/12/04
[qemu-s390x] [kvm-unit-tests PATCH 4/5] s390x: Use interrupts in SCLP and add line mode, Janosch Frank, 2018/12/04
[qemu-s390x] [kvm-unit-tests PATCH 5/5] s390x: Fix sclp-ascii.c indents, Janosch Frank, 2018/12/04