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[PATCH] i386: Implement CONFIG_PHYSICAL_ALIGN

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o Now CONFIG_PHYSICAL_START is being replaced with CONFIG_PHYSICAL_ALIGN.
  Hardcoding the kernel physical start value creates a problem in relocatable
  kernel context due to boot loader limitations. For ex, if somebody
  compiles a relocatable kernel to be run from address 4MB, but this kernel
  will run from location 1MB as grub loads the kernel at physical address
  1MB. Kernel thinks that I am a relocatable kernel and I should run from
  the address I have been loaded at. So somebody wanting to run kernel
  from 4MB alignment location (for improved performance regions) can't do
  that.

o Hence, Eric proposed that probably CONFIG_PHYSICAL_ALIGN will make
  more sense in relocatable kernel context. At run time kernel will move
  itself to a physical addr location which meets user specified alignment
  restrictions.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Vivek Goyal
2006-12-07 02:14:04 +01:00
committed by Andi Kleen
parent 6a044b3a0a
commit e69f202d0a
5 changed files with 43 additions and 32 deletions
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7
arch/i386/boot/compressed/misc.c
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@@ -14,6 +14,7 @@
#include <linux/screen_info.h>
#include <asm/io.h>
#include <asm/page.h>
#include <asm/boot.h>
/* WARNING!!
* This code is compiled with -fPIC and it is relocated dynamically
@@ -360,12 +361,12 @@ asmlinkage void decompress_kernel(void *rmode, unsigned long end,
insize = input_len;
inptr = 0;
if (((u32)output - CONFIG_PHYSICAL_START) & 0x3fffff)
error("Destination address not 4M aligned");
if ((u32)output & (CONFIG_PHYSICAL_ALIGN -1))
error("Destination address not CONFIG_PHYSICAL_ALIGN aligned");
if (end > ((-__PAGE_OFFSET-(512 <<20)-1) & 0x7fffffff))
error("Destination address too large");
#ifndef CONFIG_RELOCATABLE
if ((u32)output != CONFIG_PHYSICAL_START)
if ((u32)output != LOAD_PHYSICAL_ADDR)
error("Wrong destination address");
#endif