Messages in this thread | | | Date | Sun, 19 Jul 2009 21:02:47 -0400 | Subject | Re: [PATCH] x86: Reducing footprint of BIOS32 service mappings | From | Siarhei Liakh <> |
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For now I have only tested it on my home system and qemu. Actuallym in both cases, I had to compile kernel with only CONFIG_PCI_GOBIOS=y, since Kernel prefers other ways to access PCI when possible (with CONFIG_PCI_GOANY=y).
On Sun, Jul 19, 2009 at 8:53 PM, H. Peter Anvin<hpa@zytor.com> wrote: > Siarhei Liakh wrote: >> According to BIOS32 specification >> (http://members.datafast.net.au/dft0802/specs/bios32.pdf), at most two >> pages per BIOS32 service should be set executable and no pages need to >> be writeable. This patch modifies bios32_service() to set proper page >> access permissions at time of service discovery, as described in the >> specification. >> Further, hardcoded protection of memory area between 640k to 1Mb have >> been removed from static_protections(), since only pages mentioned >> above need to be executable, not whole BIOS region. >> >> The patch have been developed for Linux 2.6.30 x86 by Siarhei Liakh >> <sliakh.lkml@gmail.com> and Xuxian Jiang <jiang@cs.ncsu.edu>. >> > > Specifications mean little in the BIOS space, unfortunately. Do we have > any notion about how many machines this has been tested on? > > -hpa > > -- > H. Peter Anvin, Intel Open Source Technology Center > I work for Intel. I don't speak on their behalf. > > -- 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/
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