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| author | H. Peter Anvin <hpa@zytor.com> | 2009-05-12 02:56:08 +0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-05-12 04:44:39 +0400 |
| commit | 37ba7ab5e33cebc25c68fffe33e9f21e7c2014e8 (patch) | |
| tree | 006ba60fcd29b8fdee844ee6d90b85104a254d0d /arch/x86/boot/compressed/head_32.S | |
| parent | 99aa45595f45603526513d5e29fc00f8afbf3913 (diff) | |
| download | linux-37ba7ab5e33cebc25c68fffe33e9f21e7c2014e8.tar.xz | |
x86, boot: make kernel_alignment adjustable; new bzImage fields
Make the kernel_alignment field adjustable; this allows us to set it
to a large value (intended to be 16 MB to avoid ZONE_DMA contention,
memory holes and other weirdness) while a smart bootloader can still
force a loading at a lesser alignment if absolutely necessary.
Also export pref_address (preferred loading address, corresponding to
the link-time address) and init_size, the total amount of linear
memory the kernel will require during initialization.
[ Impact: allows better kernel placement, gives bootloader more info ]
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/boot/compressed/head_32.S')
| -rw-r--r-- | arch/x86/boot/compressed/head_32.S | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S index 2b8e0dfa4b27..75e4f001e706 100644 --- a/arch/x86/boot/compressed/head_32.S +++ b/arch/x86/boot/compressed/head_32.S @@ -69,8 +69,11 @@ ENTRY(startup_32) #ifdef CONFIG_RELOCATABLE movl %ebp, %ebx - addl $(CONFIG_PHYSICAL_ALIGN - 1), %ebx - andl $(~(CONFIG_PHYSICAL_ALIGN - 1)), %ebx + movl BP_kernel_alignment(%esi), %eax + decl %eax + addl %eax, %ebx + notl %eax + andl %eax, %ebx #else movl $LOAD_PHYSICAL_ADDR, %ebx #endif |