Re: Simple patches for Linux as a guest OS in a plex86 VM (please consider)

[Kevin Lawton]

Humm, that's a good idea.  I already made the mods
to files to add an #include <asm/if.h>.  That would
be a logical place to stick such macros.  I will
check this out and re-submit the patches if it's
workable.

Maybe this was what Andi meant too.  Originally thought
he meant a script file wrapper for gcc.

Will write back soon,
-Kevin

--- Andrew Morton <[e-mail]> wrote:

> I'm wondering if this can this be done a lot more simply with assembler
> macros.
> 
> The below example generates the right code.  It's then just a matter of
> getting the redefined pushfl and popfl macros into kernel-wide scope. 
> Possibly an explicit `-include' in the makefile system.
> 
> 
> asm("
> 	.macro	popfl
> 	testl	$(1<<9), 0(%esp)
> 	jz	69003f
> 	.byte	0x9d		# popfl
> 	sti
> 	jmp	69004f
> 69003:
> 	.byte	0x9d		# popfl
> 	cli
> 69004:                
> 	.endm
> ");
> 
> foo()
> {
> 	asm("popfl\n");
> }
> 

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