diff mbox series

[v5,01/22] MIPS: compressed: Use correct instruction for 64 bit code

Message ID 20231212163459.1923041-2-gregory.clement@bootlin.com (mailing list archive)
State Superseded
Commit f99c37d562250cbceed262723f91944c981eeb7b
Headers show
Series Add support for the Mobileye EyeQ5 SoC | expand

Commit Message

Gregory CLEMENT Dec. 12, 2023, 4:34 p.m. UTC 
The code clearing BSS already use macro or use correct instruction
depending if the CPU is 32 bits or 64 bits. However, a few
instructions remained 32 bits only.

By using the accurate MACRO, it is now possible to deal with memory
address beyond 32 bits. As a side effect, when using 64bits processor,
it also divides the loop number needed to clear the BSS by 2.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
---
 arch/mips/boot/compressed/head.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Thomas Bogendoerfer Dec. 21, 2023, 2:38 p.m. UTC | #1 
On Tue, Dec 12, 2023 at 05:34:33PM +0100, Gregory CLEMENT wrote:
> The code clearing BSS already use macro or use correct instruction
> depending if the CPU is 32 bits or 64 bits. However, a few
> instructions remained 32 bits only.
> 
> By using the accurate MACRO, it is now possible to deal with memory
> address beyond 32 bits. As a side effect, when using 64bits processor,
> it also divides the loop number needed to clear the BSS by 2.
> 
> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
> Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
> ---
>  arch/mips/boot/compressed/head.S | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/mips/boot/compressed/head.S b/arch/mips/boot/compressed/head.S
> index 5795d0af1e1b2..d237a834b85ee 100644
> --- a/arch/mips/boot/compressed/head.S
> +++ b/arch/mips/boot/compressed/head.S
> @@ -25,8 +25,8 @@
>  	/* Clear BSS */
>  	PTR_LA	a0, _edata
>  	PTR_LA	a2, _end
> -1:	sw	zero, 0(a0)
> -	addiu	a0, a0, 4
> +1:	PTR_S	zero, 0(a0)
> +	PTR_ADDIU a0, a0, PTRSIZE
>  	bne	a2, a0, 1b
>  
>  	PTR_LA	a0, (.heap)	     /* heap address */
> -- 
> 2.42.0

applied to mips-next.

Thomas.
diff mbox series

Patch

diff --git a/arch/mips/boot/compressed/head.S b/arch/mips/boot/compressed/head.S
index 5795d0af1e1b2..d237a834b85ee 100644
--- a/arch/mips/boot/compressed/head.S
+++ b/arch/mips/boot/compressed/head.S
@@ -25,8 +25,8 @@ 
 	/* Clear BSS */
 	PTR_LA	a0, _edata
 	PTR_LA	a2, _end
-1:	sw	zero, 0(a0)
-	addiu	a0, a0, 4
+1:	PTR_S	zero, 0(a0)
+	PTR_ADDIU a0, a0, PTRSIZE
 	bne	a2, a0, 1b
 
 	PTR_LA	a0, (.heap)	     /* heap address */