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Re: [PATCH v2 2/3] xen/riscv: initialize .bss section
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 2 Mar 2023 15:22:21 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Gianluca Guida <gianluca@xxxxxxxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 02 Mar 2023 14:22:28 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.03.2023 14:23, Oleksii Kurochko wrote:
> --- a/xen/arch/riscv/riscv64/head.S
> +++ b/xen/arch/riscv/riscv64/head.S
> @@ -13,6 +13,15 @@ ENTRY(start)
> lla a6, _dtb_base
> REG_S a1, (a6)
>
> + la a3, __bss_start
> + la a4, __bss_end
> + ble a4, a3, clear_bss_done
While it may be that .bss is indeed empty right now, even short term
it won't be, and never will. I'd drop this conditional (and in
particular the label), inserting a transient item into .bss for the
time being. As soon as your patch introducing page tables has landed,
there will be multiple pages worth of .bss.
Also are this and ...
> +clear_bss:
> + REG_S zero, (a3)
> + add a3, a3, RISCV_SZPTR
> + blt a3, a4, clear_bss
... this branch actually the correct ones? I'd expect the unsigned
flavors to be used when comparing addresses. It may not matter here
and/or right now, but it'll set a bad precedent unless you expect
to only ever work on addresses which have the sign bit clear.
Jan
> +clear_bss_done:
> +
> la sp, cpu0_boot_stack
> li t0, STACK_SIZE
> add sp, sp, t0
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