linux-kernel - Re: [PATCH v1 0/3] x86/boot: Supply boot_param in rdi instead of rsi from startup

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Message-ID: <860684c8-a985-47bc-af30-3370f203e80d@zytor.com>
Date: Mon, 23 Jun 2025 11:19:11 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Khalid Ali <khaliidcaliy@...il.com>, brgerst@...il.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        ubizjak@...il.com
Cc: x86@...nel.org, linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/3] x86/boot: Supply boot_param in rdi instead of rsi
 from startup_64()

On 2025-06-23 09:29, Khalid Ali wrote:
>> This was never intended to conform to the C ABI, why is it necessary
>> to change it?
> 
> Technically speaking, you are right, however that doesn't mean we can put something where
> ever we like. We came from C code which is bootloader and we end up to C code, so we should
> comply the ABI here too.
> 

This is also invoked by some external bootloaders that boot the ELF 
image directly, even though this is strongly discouraged.

Therefore this patchset is NAKed with extreme prejudice.

	-hpa