Messages in this thread | | | Date | Thu, 27 Mar 2008 04:02:16 -0500 | From | Paul Jackson <> | Subject | Re: [PATCH -mm 0/4] x86_64 boot: Add linked listof struct setup_data to boot protocol |
| |
Ingo asked: > what happens with the SGI machine
Unless I misunderstand your post, Ingo, you don't need an SGI machine for this one, ... just a compiler ;).
In the file arch/x86/boot/main.c, see the line:
BUILD_BUG_ON(sizeof boot_params != 4096);
This BUILD_BUG is serving as a reminder that the PC's "zero page", such as is encoded in the struct boot_params (include/asm-x86/bootparam.h) has to be exactly 4096 bytes by traditional PC architecture. One of the entries in that struct is:
struct e820entry e820_map[E820MAX]; /* 0x2d0 */
H. Peter Anvin, Andi Kleen and Huang had further discussion in an earlier email thread as to how to best extend this limit. I trust that Huang's patch represents their concensus of that discussion.
By the way, Peter, do you have any idea what that E820NR define is doing in include/asm-x86/e820.h ... it looks like useless redundancy to me?
-- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson <pj@sgi.com> 1.940.382.4214
| |