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Re: [PATCH v7 03/19] xen/riscv: introduce extenstion support check by compiler
- To: Oleksii <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 4 Apr 2024 17:43:49 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 04 Apr 2024 15:44:00 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.04.2024 17:18, Oleksii wrote:
> On Thu, 2024-04-04 at 12:07 +0200, Jan Beulich wrote:
>> On 03.04.2024 12:19, Oleksii Kurochko wrote:
>>> --- a/xen/arch/riscv/arch.mk
>>> +++ b/xen/arch/riscv/arch.mk
>>> @@ -3,16 +3,27 @@
>>>
>>> $(call cc-options-add,CFLAGS,CC,$(EMBEDDED_EXTRA_CFLAGS))
>>>
>>> -CFLAGS-$(CONFIG_RISCV_64) += -mabi=lp64
>>> +riscv-abi-$(CONFIG_RISCV_32) := -mabi=ilp32
>>> +riscv-abi-$(CONFIG_RISCV_64) := -mabi=lp64
>>>
>>> riscv-march-$(CONFIG_RISCV_ISA_RV64G) := rv64g
>>> riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c
>>>
>>> +riscv-generic-flags := $(riscv-abi-y) -march=$(riscv-march-y)
>>> +
>>> +zbb := $(call as-insn,$(CC) $(riscv-generic-flags)_zbb,"",_zbb)
>>
>> While committing another question popped up: Why "" (i.e. no insn)
>> here, ...
>>
>>> +zihintpause := $(call as-insn,\
>>> + $(CC) $(riscv-generic-
>>> flags)_zihintpause,"pause",_zihintpause)
>>
>> ... but "pause" here?
>
> In the case of the Zbb extension, we don't check for a specific
> instruction, but with the Zihintpause, the idea was to verify if the
> pause instruction is supported or not.
And why's this verification relevant here, but not for Zbb?
Jan
> However, in both checks, there
> might be no instruction as an argument of as-insn.
>
> ~ Oleksii
|
