diff options
| author | Subrata Banik <subratabanik@google.com> | 2024-05-18 15:59:45 +0530 |
|---|---|---|
| committer | Subrata Banik <subratabanik@google.com> | 2024-05-24 08:10:51 +0000 |
| commit | 814ae3b05507726938b0f9a9ba0c3a2a37e7b295 (patch) | |
| tree | 1ebe33444b5a2d308fbfa5d1f007658d334fddcf /payloads/libpayload/arch/x86/multiboot_header.inc | |
| parent | 4050ef091a18507617786648f901dd1eb477a8d5 (diff) | |
libpayload: x86: Move Multiboot header to include file
This moves the multiboot header into its own include file, simplifying
head.S and making it easier to include/exclude the multiboot header
based on config options.
BUG=b:242829490
TEST=Able to build and boot google/rex.
Change-Id: I59a22dfe36044b4dd64a5b028a134be7a7d02a48
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82533
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'payloads/libpayload/arch/x86/multiboot_header.inc')
| -rw-r--r-- | payloads/libpayload/arch/x86/multiboot_header.inc | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/payloads/libpayload/arch/x86/multiboot_header.inc b/payloads/libpayload/arch/x86/multiboot_header.inc new file mode 100644 index 0000000000..e321dc42b2 --- /dev/null +++ b/payloads/libpayload/arch/x86/multiboot_header.inc @@ -0,0 +1,54 @@ +/* + * + * Copyright (C) 2008 Advanced Micro Devices, Inc. + * Copyright (C) 2017 Patrick Rudolph <siro@das-labor.org> + * Copyright (C) 2024 Google Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#define MB_MAGIC 0x1BADB002 +#define MB_FLAGS 0x00010003 + + jmp _init + +/* + * Note: The Multiboot standard requires Multiboot header to be placed + * below 0x2000 in the resulting image. See: + * http://www.gnu.org/software/grub/manual/multiboot/html_node/OS-image-format.html + */ +mb_header: + .long MB_MAGIC + .long MB_FLAGS + .long -(MB_MAGIC + MB_FLAGS) + .long mb_header + .long _start + .long _edata + .long _end + .long _init + +_init: + /* Store EAX and EBX */ + movl %eax, loader_eax + movl %ebx, loader_ebx |