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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Denis Orlov <denorl2009@gmail.com>, barebox@lists.infradead.org
Subject: Re: [PATCH 12/17] MIPS: enable 64-bit kernel segment addressing on CONFIG_64BIT
Date: Tue, 6 Jun 2023 11:06:18 +0200	[thread overview]
Message-ID: <100685f9-a2f4-afbd-b47d-f661cca704dd@pengutronix.de> (raw)
In-Reply-To: <20230605202634.42175-13-denorl2009@gmail.com>

On 05.06.23 22:10, Denis Orlov wrote:
> This allows using addresses from XKPHYS segment. This is needed as we
> access hardware registers through this segment in 64BIT configuration,
> but this also lets us peek/poke bigger memory address space using
> commands that work with memory on 64BIT.
> 
> With this commit, malta with 64-bit CPU finally boots into 64BIT barebox
> in QEMU.
> 
> Signed-off-by: Denis Orlov <denorl2009@gmail.com>

Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

> ---
>  arch/mips/boot/start.S             |  2 ++
>  arch/mips/include/asm/pbl_macros.h | 11 +++++++++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/arch/mips/boot/start.S b/arch/mips/boot/start.S
> index 5f134f9ae9..30828ad9ef 100644
> --- a/arch/mips/boot/start.S
> +++ b/arch/mips/boot/start.S
> @@ -26,6 +26,8 @@ EXPORT(_start)
>  
>  	mips_disable_interrupts
>  
> +	mips64_enable_64bit_addressing
> +
>  	copy_to_link_location _start
>  
>  	stack_setup
> diff --git a/arch/mips/include/asm/pbl_macros.h b/arch/mips/include/asm/pbl_macros.h
> index 1fba690c8c..ce169a1554 100644
> --- a/arch/mips/include/asm/pbl_macros.h
> +++ b/arch/mips/include/asm/pbl_macros.h
> @@ -152,6 +152,17 @@
>  	.set	pop
>  	.endm
>  
> +	.macro	mips64_enable_64bit_addressing
> +#ifdef CONFIG_64BIT
> +	.set	push
> +	.set	noreorder
> +	mfc0	k0, CP0_STATUS
> +	or	k0, ST0_KX
> +	mtc0	k0, CP0_STATUS
> +	.set	pop
> +#endif
> +	.endm
> +
>  	.macro	mips_barebox_10h
>  	.set	push
>  	.set	noreorder

-- 
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  reply	other threads:[~2023-06-06  9:07 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-06-05 20:10 [PATCH 00/17] MIPS: fix and improve 64BIT support Denis Orlov
2023-06-05 20:10 ` [PATCH 01/17] MIPS: malta: allow to choose MIPS64 target CPU in config Denis Orlov
2023-06-06  8:06   ` Ahmad Fatoum
2023-06-05 20:10 ` [PATCH 02/17] MIPS: malta: use CKSEG instead of KSEG macros Denis Orlov
2023-06-06  8:03   ` Ahmad Fatoum
2023-06-06  9:14     ` Denis Orlov
2023-06-05 20:10 ` [PATCH 03/17] MIPS: reloc: fix relocation with CONFIG_64BIT enabled Denis Orlov
2023-06-06  8:08   ` Ahmad Fatoum
2023-06-05 20:10 ` [PATCH 04/17] MIPS: o32: provide ta0..ta3 register definitions Denis Orlov
2023-06-06  8:13   ` Ahmad Fatoum
2023-06-06  9:38     ` Denis Orlov
2023-06-05 20:10 ` [PATCH 05/17] MIPS: pbl: use o32/n64 compatible " Denis Orlov
2023-06-06  8:20   ` Ahmad Fatoum
2023-06-05 20:10 ` [PATCH 06/17] MIPS: pbl: fix linking errors with CONFIG_64BIT Denis Orlov
2023-06-05 20:10 ` [PATCH 07/17] MIPS: use MIPS32/MIPS64 generic instruction macros Denis Orlov
2023-06-06  8:23   ` Ahmad Fatoum
2023-06-05 20:10 ` [PATCH 08/17] MIPS: malta: fix GT64120 base virtual address on 64BIT Denis Orlov
2023-06-06  8:35   ` Ahmad Fatoum
2023-06-05 20:10 ` [PATCH 09/17] MIPS: fix addresses of exception vectors in 64-bit mode Denis Orlov
2023-06-06  8:36   ` Ahmad Fatoum
2023-06-05 20:10 ` [PATCH 10/17] MIPS: fix *ADDR macro usage warnings on CONFIG_64BIT Denis Orlov
2023-06-05 20:10 ` [PATCH 11/17] MIPS: Makefile: sign-extend TEXT_BASE value " Denis Orlov
2023-06-06  9:04   ` Ahmad Fatoum
2023-06-06  9:23     ` Denis Orlov
2023-06-09  6:40       ` Ahmad Fatoum
2023-06-05 20:10 ` [PATCH 12/17] MIPS: enable 64-bit kernel segment addressing " Denis Orlov
2023-06-06  9:06   ` Ahmad Fatoum [this message]
2023-06-05 20:10 ` [PATCH 13/17] MIPS: traps: fix passing wrong sp when returning from exception Denis Orlov
2023-06-05 20:10 ` [PATCH 14/17] MIPS: pbl_macros: use generic load/store macros in copy_to_link_location Denis Orlov
2023-06-06  9:07   ` Ahmad Fatoum
2023-06-05 20:10 ` [PATCH 15/17] MIPS: add 64-bit support for optimized string functions Denis Orlov
2023-06-05 20:10 ` [PATCH 16/17] MIPS: make setjmp/longjmp/initjmp available in 64BIT builds Denis Orlov
2023-06-05 20:10 ` [PATCH 17/17] MIPS: main_entry-pbl: fix conversion warnings on CONFIG_64BIT Denis Orlov
2023-06-06  8:02 ` [PATCH 00/17] MIPS: fix and improve 64BIT support Ahmad Fatoum
2023-06-06  8:43   ` Denis Orlov
2023-06-09  6:43 ` Sascha Hauer

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