diff options
| author | Yinghai Lu <yinghai@kernel.org> | 2013-01-24 12:19:57 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2013-01-29 15:25:45 -0800 |
| commit | f1da834cd902f5e5df0b11a3948fc43c6071b590 (patch) | |
| tree | b5af62bf482c592d589aab96f6910e5dd4d10220 /arch/x86/kernel/head64.c | |
| parent | a8a51a88d5152aa40e5e07dcdd939c7fafc42224 (diff) | |
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>
Diffstat (limited to 'arch/x86/kernel/head64.c')
| -rw-r--r-- | arch/x86/kernel/head64.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index b88a1fab215..62c8ce44cac 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); } } |