diff options
| author | H. Peter Anvin | 2009-05-12 00:56:08 +0200 |
|---|---|---|
| committer | H. Peter Anvin | 2009-05-12 02:44:39 +0200 |
| commit | 37ba7ab5e33cebc25c68fffe33e9f21e7c2014e8 (patch) | |
| tree | 006ba60fcd29b8fdee844ee6d90b85104a254d0d /arch/x86/boot/compressed/head_64.S | |
| parent | x86, boot: remove dead code from boot/compressed/head_*.S (diff) | |
| download | kernel-qcow2-linux-37ba7ab5e33cebc25c68fffe33e9f21e7c2014e8.tar.gz kernel-qcow2-linux-37ba7ab5e33cebc25c68fffe33e9f21e7c2014e8.tar.xz kernel-qcow2-linux-37ba7ab5e33cebc25c68fffe33e9f21e7c2014e8.zip | |
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_64.S')
| -rw-r--r-- | arch/x86/boot/compressed/head_64.S | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index 2bb500af1bd7..f62c284db9eb 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -84,8 +84,11 @@ ENTRY(startup_32) #ifdef CONFIG_RELOCATABLE movl %ebp, %ebx - addl $(PMD_PAGE_SIZE -1), %ebx - andl $PMD_PAGE_MASK, %ebx + movl BP_kernel_alignment(%esi), %eax + decl %eax + addl %eax, %ebx + notl %eax + andl %eax, %ebx #else movl $LOAD_PHYSICAL_ADDR, %ebx #endif @@ -224,8 +227,11 @@ ENTRY(startup_64) /* Start with the delta to where the kernel will run at. */ #ifdef CONFIG_RELOCATABLE leaq startup_32(%rip) /* - $startup_32 */, %rbp - addq $(PMD_PAGE_SIZE - 1), %rbp - andq $PMD_PAGE_MASK, %rbp + movl BP_kernel_alignment(%rsi), %eax + decl %eax + addq %rax, %rbp + notq %rax + andq %rax, %rbp #else movq $LOAD_PHYSICAL_ADDR, %rbp #endif |