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Subject[tip:x86/boot] x86/boot: Clarify purpose of functions in misc.c
Commit-ID:  c04028813221c2d39a4f368586795ac4466d311c
Gitweb: http://git.kernel.org/tip/c04028813221c2d39a4f368586795ac4466d311c
Author: Kees Cook <keescook@chromium.org>
AuthorDate: Mon, 18 Apr 2016 09:42:13 -0700
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 19 Apr 2016 10:30:51 +0200

x86/boot: Clarify purpose of functions in misc.c

The function "decompress_kernel" now performs many more duties, so this
patch renames it to "extract_kernel" and updates callers and comments.
Additionally the file header comment for misc.c is improved to actually
describe what is contained.

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Borislav Petkov <bp@suse.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: H.J. Lu <hjl.tools@gmail.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1460997735-24785-5-git-send-email-keescook@chromium.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/boot/compressed/head_32.S | 8 ++++----
arch/x86/boot/compressed/head_64.S | 4 ++--
arch/x86/boot/compressed/misc.c | 10 ++++++----
3 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S
index 0256064..26dd9df 100644
--- a/arch/x86/boot/compressed/head_32.S
+++ b/arch/x86/boot/compressed/head_32.S
@@ -233,9 +233,9 @@ relocated:
2:

/*
- * Do the decompression, and jump to the new kernel..
+ * Do the extraction, and jump to the new kernel..
*/
- /* push arguments for decompress_kernel: */
+ /* push arguments for extract_kernel: */
pushl $z_run_size /* size of kernel with .bss and .brk */
pushl $z_output_len /* decompressed length, end of relocs */
leal z_extract_offset_negative(%ebx), %ebp
@@ -246,11 +246,11 @@ relocated:
leal boot_heap(%ebx), %eax
pushl %eax /* heap area */
pushl %esi /* real mode pointer */
- call decompress_kernel /* returns kernel location in %eax */
+ call extract_kernel /* returns kernel location in %eax */
addl $28, %esp

/*
- * Jump to the decompressed kernel.
+ * Jump to the extracted kernel.
*/
xorl %ebx, %ebx
jmp *%eax
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index 86558a1..d43c30e 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -408,7 +408,7 @@ relocated:
2:

/*
- * Do the decompression, and jump to the new kernel..
+ * Do the extraction, and jump to the new kernel..
*/
pushq %rsi /* Save the real mode argument */
movq $z_run_size, %r9 /* size of kernel with .bss and .brk */
@@ -419,7 +419,7 @@ relocated:
movl $z_input_len, %ecx /* input_len */
movq %rbp, %r8 /* output target address */
movq $z_output_len, %r9 /* decompressed length, end of relocs */
- call decompress_kernel /* returns kernel location in %rax */
+ call extract_kernel /* returns kernel location in %rax */
popq %r9
popq %rsi

diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 462dfbf..0d69e80 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -1,8 +1,10 @@
/*
* misc.c
*
- * This is a collection of several routines from gzip-1.0.3
- * adapted for Linux.
+ * This is a collection of several routines used to extract the kernel
+ * which includes KASLR relocation, decompression, ELF parsing, and
+ * relocation processing. Additionally included are the screen and serial
+ * output functions and related debugging support functions.
*
* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
* puts by Nick Holloway 1993, better puts by Martin Mares 1995
@@ -383,7 +385,7 @@ static void parse_elf(void *output)
free(phdrs);
}

-asmlinkage __visible void *decompress_kernel(void *rmode, memptr heap,
+asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
unsigned char *input_data,
unsigned long input_len,
unsigned char *output,
@@ -412,7 +414,7 @@ asmlinkage __visible void *decompress_kernel(void *rmode, memptr heap,
cols = boot_params->screen_info.orig_video_cols;

console_init();
- debug_putstr("early console in decompress_kernel\n");
+ debug_putstr("early console in extract_kernel\n");

free_mem_ptr = heap; /* Heap */
free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
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