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: Add get_cmd_line_ptr()
Commit-ID:  f1da834cd902f5e5df0b11a3948fc43c6071b590
Gitweb: http://git.kernel.org/tip/f1da834cd902f5e5df0b11a3948fc43c6071b590
Author: Yinghai Lu <yinghai@kernel.org>
AuthorDate: Thu, 24 Jan 2013 12:19:57 -0800
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Tue, 29 Jan 2013 15:25:45 -0800

x86, boot: Add get_cmd_line_ptr()

Add an accessor function for the command line address.
Later we will add support for holding a 64-bit address via ext_cmd_line_ptr.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-17-git-send-email-yinghai@kernel.org
Cc: Gokul Caushik <caushik1@gmail.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Joe Millenbach <jmillenbach@gmail.com>
Cc: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
arch/x86/boot/compressed/cmdline.c | 10 ++++++++--
arch/x86/kernel/head64.c | 13 +++++++++++--
2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/arch/x86/boot/compressed/cmdline.c b/arch/x86/boot/compressed/cmdline.c
index 10f6b11..b4c913c 100644
--- a/arch/x86/boot/compressed/cmdline.c
+++ b/arch/x86/boot/compressed/cmdline.c
@@ -13,13 +13,19 @@ static inline char rdfs8(addr_t addr)
return *((char *)(fs + addr));
}
#include "../cmdline.c"
+static unsigned long get_cmd_line_ptr(void)
+{
+ unsigned long cmd_line_ptr = real_mode->hdr.cmd_line_ptr;
+
+ return cmd_line_ptr;
+}
int cmdline_find_option(const char *option, char *buffer, int bufsize)
{
- return __cmdline_find_option(real_mode->hdr.cmd_line_ptr, option, buffer, bufsize);
+ return __cmdline_find_option(get_cmd_line_ptr(), option, buffer, bufsize);
}
int cmdline_find_option_bool(const char *option)
{
- return __cmdline_find_option_bool(real_mode->hdr.cmd_line_ptr, option);
+ return __cmdline_find_option_bool(get_cmd_line_ptr(), option);
}

#endif
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index b88a1fa..62c8ce4 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -112,14 +112,23 @@ static void __init clear_bss(void)
(unsigned long) __bss_stop - (unsigned long) __bss_start);
}

+static unsigned long get_cmd_line_ptr(void)
+{
+ unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
+
+ return cmd_line_ptr;
+}
+
static void __init copy_bootdata(char *real_mode_data)
{
char * command_line;
+ unsigned long cmd_line_ptr;

memcpy(&boot_params, real_mode_data, sizeof boot_params);
sanitize_boot_params(&boot_params);
- if (boot_params.hdr.cmd_line_ptr) {
- command_line = __va(boot_params.hdr.cmd_line_ptr);
+ cmd_line_ptr = get_cmd_line_ptr();
+ if (cmd_line_ptr) {
+ command_line = __va(cmd_line_ptr);
memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
}
}

\
 
 \ /
  Last update: 2013-01-30 03:01    [W:0.293 / U:0.360 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site