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x86, boot: Add get_cmd_line_ptr()

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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>
This commit is contained in:
Yinghai Lu 2013-01-24 12:19:57 -08:00 committed by H. Peter Anvin
parent a8a51a88d5
commit f1da834cd9
2 changed files with 19 additions and 4 deletions
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10
arch/x86/boot/compressed/cmdline.c
View File

@ -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

13
arch/x86/kernel/head64.c
View File

@ -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);
}
}