Messages in this thread | | | Date | Wed, 22 Jan 2003 11:56:41 -0800 | From | Andrew Morton <> | Subject | Re: Simple patches for Linux as a guest OS in a plex86 VM (please consider) |
| |
Kevin Lawton <kevinlawton2001@yahoo.com> wrote: > > Hello all, > > I'm working on running Linux as a guest OS inside a > lightweight cut-down plex86 environment. My goal is to > run a stock Linux kernel, which can be slimmed down to > the essentials via kernel configuration, since a guest > OS doesn't need to drive much hardware. > > For this, there's a few critical but simple diffs to > macro'ize the use of the PUSHF and POPF instructions, > due to broken semantics of running stuff using > PVI (protected mode virtual interrupts). The rest of > the stuff I believe can be monitored effectively by > the VM monitor. > > Would you please consider integrating these diffs before 2.6? > There's only one new header file, and macro substitution for > a few cases where these instructions are used. For a normal > compile, there are zero logic changes. Just 1:1 macros.
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"); }
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |