MIPS: FW: Add environment variable processing. (14aecdd4) · Commits · e / devices / android_kernel_teracube_2e

arch/mips/fw/lib/Makefile

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		@@ -2,4 +2,6 @@
		# Makefile for generic prom monitor library routines under Linux.
		#

		lib-y += cmdline.o

		lib-$(CONFIG_64BIT) += call_o32.o

arch/mips/fw/lib/cmdline.c

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		/*
		* This file is subject to the terms and conditions of the GNU General Public
		* License. See the file "COPYING" in the main directory of this archive
		* for more details.
		*
		* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
		*/
		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/string.h>

		#include <asm/addrspace.h>
		#include <asm/fw/fw.h>

		int fw_argc;
		int *_fw_argv;
		int *_fw_envp;

		void __init fw_init_cmdline(void)
		{
		int i;

		/* Validate command line parameters. */
		if ((fw_arg0 >= CKSEG0) \|\| (fw_arg1 < CKSEG0)) {
		fw_argc = 0;
		_fw_argv = NULL;
		} else {
		fw_argc = (fw_arg0 & 0x0000ffff);
		_fw_argv = (int *)fw_arg1;
		}

		/* Validate environment pointer. */
		if (fw_arg2 < CKSEG0)
		_fw_envp = NULL;
		else
		_fw_envp = (int *)fw_arg2;

		for (i = 1; i < fw_argc; i++) {
		strlcat(arcs_cmdline, fw_argv(i), COMMAND_LINE_SIZE);
		if (i < (fw_argc - 1))
		strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
		}
		}

		char * __init fw_getcmdline(void)
		{
		return &(arcs_cmdline[0]);
		}

		char fw_getenv(char envname)
		{
		char *result = NULL;

		if (_fw_envp != NULL) {
		/*
		* Return a pointer to the given environment variable.
		* YAMON uses "name", "value" pairs, while U-Boot uses
		* "name=value".
		*/
		int i, yamon, index = 0;

		yamon = (strchr(fw_envp(index), '=') == NULL);
		i = strlen(envname);

		while (fw_envp(index)) {
		if (strncmp(envname, fw_envp(index), i) == 0) {
		if (yamon) {
		result = fw_envp(index + 1);
		break;
		} else if (fw_envp(index)[i] == '=') {
		result = (fw_envp(index + 1) + i);
		break;
		}
		}

		/* Increment array index. */
		if (yamon)
		index += 2;
		else
		index += 1;
		}
		}

		return result;
		}

		unsigned long fw_getenvl(char *envname)
		{
		unsigned long envl = 0UL;
		char *str;
		long val;
		int tmp;

		str = fw_getenv(envname);
		if (str) {
		tmp = kstrtol(str, 0, &val);
		envl = (unsigned long)val;
		}

		return envl;
		}

arch/mips/include/asm/fw/fw.h

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		/*
		* This file is subject to the terms and conditions of the GNU General Public
		* License. See the file "COPYING" in the main directory of this archive
		* for more details.
		*
		* Copyright (C) 2012 MIPS Technologies, Inc.
		*/
		#ifndef __ASM_FW_H_
		#define __ASM_FW_H_

		#include <asm/bootinfo.h> /* For cleaner code... */

		enum fw_memtypes {
		fw_dontuse,
		fw_code,
		fw_free,
		};

		typedef struct {
		unsigned long base; /* Within KSEG0 */
		unsigned int size; /* bytes */
		enum fw_memtypes type; /* fw_memtypes */
		} fw_memblock_t;

		/* Maximum number of memory block descriptors. */
		#define FW_MAX_MEMBLOCKS 32

		extern int fw_argc;
		extern int *_fw_argv;
		extern int *_fw_envp;

		/*
		* Most firmware like YAMON, PMON, etc. pass arguments and environment
		* variables as 32-bit pointers. These take care of sign extension.
		*/
		#define fw_argv(index) ((char *)(long)_fw_argv[(index)])
		#define fw_envp(index) ((char *)(long)_fw_envp[(index)])

		extern void fw_init_cmdline(void);
		extern char *fw_getcmdline(void);
		extern fw_memblock_t *fw_getmdesc(void);
		extern void fw_meminit(void);
		extern char fw_getenv(char name);
		extern unsigned long fw_getenvl(char *name);
		extern void fw_init_early_console(char port);

		#endif /* __ASM_FW_H_ */