lkml.org 
[lkml]   [2013]   [Jan]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:x86/mm2] x86, boot: Support loading bzImage, boot_params and ramdisk above 4G
Commit-ID:  ee92d815027a76ef92f3ec7b155b0c8aa345f239
Gitweb: http://git.kernel.org/tip/ee92d815027a76ef92f3ec7b155b0c8aa345f239
Author: Yinghai Lu <yinghai@kernel.org>
AuthorDate: Mon, 28 Jan 2013 20:16:44 -0800
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Tue, 29 Jan 2013 19:32:33 -0800

x86, boot: Support loading bzImage, boot_params and ramdisk above 4G

xloadflags bit 1 indicates that we can load the kernel and all data
structures above 4G; it is set if kernel is relocatable and 64bit.

bootloader will check if xloadflags bit 1 is set to decide if
it could load ramdisk and kernel high above 4G.

bootloader will fill value to ext_ramdisk_image/size for high 32bits
when it load ramdisk above 4G.
kernel use get_ramdisk_image/size to use ext_ramdisk_image/size to get
right positon for ramdisk.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Rob Landley <rob@landley.net>
Cc: Matt Fleming <matt.fleming@intel.com>
Cc: Gokul Caushik <caushik1@gmail.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Joe Millenbach <jmillenbach@gmail.com>
Link: http://lkml.kernel.org/r/1359058816-7615-26-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
arch/x86/boot/compressed/cmdline.c | 2 ++
arch/x86/boot/header.S | 10 +++++++++-
arch/x86/kernel/head64.c | 2 ++
arch/x86/kernel/setup.c | 4 ++++
4 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/arch/x86/boot/compressed/cmdline.c b/arch/x86/boot/compressed/cmdline.c
index b4c913c..bffd73b 100644
--- a/arch/x86/boot/compressed/cmdline.c
+++ b/arch/x86/boot/compressed/cmdline.c
@@ -17,6 +17,8 @@ static unsigned long get_cmd_line_ptr(void)
{
unsigned long cmd_line_ptr = real_mode->hdr.cmd_line_ptr;

+ cmd_line_ptr |= (u64)real_mode->ext_cmd_line_ptr << 32;
+
return cmd_line_ptr;
}
int cmdline_find_option(const char *option, char *buffer, int bufsize)
diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
index 944ce59..9ec06a1 100644
--- a/arch/x86/boot/header.S
+++ b/arch/x86/boot/header.S
@@ -374,6 +374,14 @@ xloadflags:
#else
# define XLF0 0
#endif
+
+#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_X86_64)
+ /* kernel/boot_param/ramdisk could be loaded above 4g */
+# define XLF1 XLF_CAN_BE_LOADED_ABOVE_4G
+#else
+# define XLF1 0
+#endif
+
#ifdef CONFIG_EFI_STUB
# ifdef CONFIG_X86_64
# define XLF23 XLF_EFI_HANDOVER_64 /* 64-bit EFI handover ok */
@@ -383,7 +391,7 @@ xloadflags:
#else
# define XLF23 0
#endif
- .word XLF0 | XLF23
+ .word XLF0 | XLF1 | XLF23

cmdline_size: .long COMMAND_LINE_SIZE-1 #length of the command line,
#added with boot protocol
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 62c8ce4..6873b07 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -116,6 +116,8 @@ static unsigned long get_cmd_line_ptr(void)
{
unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;

+ cmd_line_ptr |= (u64)boot_params.ext_cmd_line_ptr << 32;
+
return cmd_line_ptr;
}

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 83b3861..519f2bc 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -298,12 +298,16 @@ static u64 __init get_ramdisk_image(void)
{
u64 ramdisk_image = boot_params.hdr.ramdisk_image;

+ ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
+
return ramdisk_image;
}
static u64 __init get_ramdisk_size(void)
{
u64 ramdisk_size = boot_params.hdr.ramdisk_size;

+ ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
+
return ramdisk_size;
}


\
 
 \ /
  Last update: 2013-01-30 05:01    [W:0.406 / U:0.208 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site