diff options
| author | H. Peter Anvin <hpa@zytor.com> | 2009-05-08 17:42:16 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-05-08 17:46:34 -0700 |
| commit | 02a884c0fe7ec8459d00d34b7d4101af21fc4a86 (patch) | |
| tree | 164783f84130482e52290af03d96ff8e887f8605 /arch/x86/boot/compressed/head_32.S | |
| parent | 36d3793c947f1ef7ba3d24eeeddc1be41adc5ab4 (diff) | |
x86, boot: determine compressed code offset at compile time
Determine the compressed code offset (from the kernel runtime address)
at compile time. This allows some minor optimizations in
arch/x86/boot/compressed/head_*.S, but more importantly it makes this
value available to the build process, which will enable a future patch
to export the necessary linear memory footprint into the bzImage
header.
[ Impact: cleanup, future patch enabling ]
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 | 24 |
1 files changed, 5 insertions, 19 deletions
diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S index 6710dc78ac59..470474bafc4d 100644 --- a/arch/x86/boot/compressed/head_32.S +++ b/arch/x86/boot/compressed/head_32.S @@ -75,18 +75,8 @@ ENTRY(startup_32) movl $LOAD_PHYSICAL_ADDR, %ebx #endif - /* Replace the compressed data size with the uncompressed size */ - subl input_len(%ebp), %ebx - movl output_len(%ebp), %eax - addl %eax, %ebx - /* Add 8 bytes for every 32K input block */ - shrl $12, %eax - addl %eax, %ebx - /* Add 32K + 18 bytes of extra slack */ - addl $(32768 + 18), %ebx - /* Align on a 4K boundary */ - addl $4095, %ebx - andl $~4095, %ebx + /* Target address to relocate to for decompression */ + addl $z_extract_offset, %ebx /* Set up the stack */ leal boot_stack_end(%ebx), %esp @@ -142,12 +132,10 @@ relocated: /* * Do the decompression, and jump to the new kernel.. */ - movl output_len(%ebx), %eax - pushl %eax + leal z_extract_offset_negative(%ebx), %ebp /* push arguments for decompress_kernel: */ pushl %ebp /* output address */ - movl input_len(%ebx), %eax - pushl %eax /* input_len */ + pushl $z_input_len /* input_len */ leal input_data(%ebx), %eax pushl %eax /* input_data */ leal boot_heap(%ebx), %eax @@ -155,14 +143,12 @@ relocated: pushl %esi /* real mode pointer */ call decompress_kernel addl $20, %esp - popl %ecx #if CONFIG_RELOCATABLE /* * Find the address of the relocations. */ - movl %ebp, %edi - addl %ecx, %edi + leal z_output_len(%ebp), %edi /* * Calculate the delta between where vmlinux was compiled to run |