Commit f1da834c authored by Yinghai Lu's avatar Yinghai Lu Committed by H. Peter Anvin
Browse files

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: default avatarYinghai 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: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent a8a51a88

arch/x86/boot/compressed/cmdline.c

+8 −2
Original line number Diff line number Diff line
@@ -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

arch/x86/kernel/head64.c

+11 −2
Original line number Diff line number Diff line
@@ -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);

	}

}

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