[ipxe-devel] 486 with a Realtek 8139, patch

[Geert Stappers]

On Sun, May 09, 2021 at 03:37:18AM +0300, Nikolai Zhubr wrote:
> 08.05.2021 9:45, Geert Stappers:
> >   ...
> > Any chance in dumping somewhere
> > a rough / rude version of the made changes?
> 
> No worries, it is basically a 5-liner, and I don't hide my bugfixes. Please
> see a diff file attached,

> --- src/arch/i386/core/realmode_asm.S	2010-09-05 23:47:29.000000000 +0300
> +++ src/arch/i386/core/realmode_asm.S	2021-05-09 01:25:42.042733352 +0300
> @@ -301,9 +301,11 @@
>  	movl	%eax, %ebx
>  	shrl	$4, %ebx
>  	pushw	%bx
> -	leal	3f(%ebp), %ebx
> +	movw	%bx, (p2r_ljmp_rm+3)(%ebp)
> +	leal	(p2r_ljmp_rm+5)(%ebp), %ebx
>  	subl	%eax, %ebx
>  	pushw	%bx
> +	movw	%bx, (p2r_ljmp_rm+1)(%ebp)
>  	/* Continuation address */
>  	pushl	$(p2r_rmcs - p2r_gdt)
>  	leal	2f(%ebp), %ebx
> @@ -348,12 +350,21 @@
>  	/* Make intersegment jmp to flush the processor pipeline
>  	 * and reload %cs:%eip (to clear upper 16 bits of %eip).
>  	 */
> -	lret
> -3:
>  
> +p2r_ljmp_rm:
> +	ljmp	$0, $9f /* EA oo oo ss ss */
> +9:
>  	/* Load real-mode segment value to %ss.  %sp already OK */
>  	shrl	$4, %eax
>  	movw	%ax, %ss
> +	movzwl	%sp, %esp
> +	movw	%ax, %ds
> +	movw	%ax, %es
> +	movw	%ax, %fs
> +	movw	%ax, %gs
> +
> +	popw	%bx
> +	popw	%bx
>  
>  	/* Restore registers */
>  	popl	%eax
> 


I wasn't able to apply that patch.

Screenshot:
|        ... output of `patch < /path/to/saved/email` ...
||--- src/arch/i386/core/realmode_asm.S  2010-09-05 23:47:29.000000000 +0300
||+++ src/arch/i386/core/realmode_asm.S  2021-05-09 01:25:42.042733352 +0300
|--------------------------
|File to patch: src/arch/i386/core/realmode_asm.S
|src/arch/i386/core/realmode_asm.S: No such file or directory
|Skip this patch? [y]
|Skipping patch.
|2 out of 2 hunks ignored
|$ ls src/arch/i386/core/
|gdbidt.S  nulltrap.c  setjmp.S
|$


Where originates the 2010  realmode_asm.S  from?



Groeten
Geert Stappers
-- 
Silence is hard to parse