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145 lines
3.7 KiB
145 lines
3.7 KiB
/* |
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* |
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* BRIEF MODULE DESCRIPTION |
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* PROM library initialisation code, supports YAMON and U-Boot. |
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* |
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* Copyright 2000-2001, 2006, 2008 MontaVista Software Inc. |
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* Author: MontaVista Software, Inc. <[email protected]> |
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* |
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* This file was derived from Carsten Langgaard's |
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* arch/mips/mips-boards/xx files. |
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* |
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* Carsten Langgaard, [email protected] |
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* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved. |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the |
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* Free Software Foundation; either version 2 of the License, or (at your |
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* option) any later version. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN |
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/memblock.h> |
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#include <linux/sizes.h> |
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#include <linux/string.h> |
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#include <asm/bootinfo.h> |
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int prom_argc; |
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char **prom_argv; |
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char **prom_envp; |
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void __init prom_init_cmdline(void) |
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{ |
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int i; |
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for (i = 1; i < prom_argc; i++) { |
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strlcat(arcs_cmdline, prom_argv[i], COMMAND_LINE_SIZE); |
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if (i < (prom_argc - 1)) |
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strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE); |
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} |
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} |
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char *prom_getenv(char *envname) |
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{ |
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/* |
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* Return a pointer to the given environment variable. |
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* YAMON uses "name", "value" pairs, while U-Boot uses "name=value". |
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*/ |
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char **env = prom_envp; |
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int i = strlen(envname); |
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int yamon = (*env && strchr(*env, '=') == NULL); |
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while (*env) { |
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if (yamon) { |
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if (strcmp(envname, *env++) == 0) |
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return *env; |
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} else if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=') |
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return *env + i + 1; |
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env++; |
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} |
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return NULL; |
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} |
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void __init prom_init(void) |
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{ |
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unsigned char *memsize_str; |
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unsigned long memsize; |
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prom_argc = (int)fw_arg0; |
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prom_argv = (char **)fw_arg1; |
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prom_envp = (char **)fw_arg2; |
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prom_init_cmdline(); |
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memsize_str = prom_getenv("memsize"); |
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if (!memsize_str || kstrtoul(memsize_str, 0, &memsize)) |
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memsize = SZ_64M; /* minimum memsize is 64MB RAM */ |
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memblock_add(0, memsize); |
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} |
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static inline unsigned char str2hexnum(unsigned char c) |
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{ |
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if (c >= '0' && c <= '9') |
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return c - '0'; |
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if (c >= 'a' && c <= 'f') |
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return c - 'a' + 10; |
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if (c >= 'A' && c <= 'F') |
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return c - 'A' + 10; |
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return 0; /* foo */ |
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} |
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static inline void str2eaddr(unsigned char *ea, unsigned char *str) |
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{ |
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int i; |
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for (i = 0; i < 6; i++) { |
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unsigned char num; |
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if ((*str == '.') || (*str == ':')) |
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str++; |
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num = str2hexnum(*str++) << 4; |
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num |= str2hexnum(*str++); |
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ea[i] = num; |
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} |
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} |
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int __init prom_get_ethernet_addr(char *ethernet_addr) |
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{ |
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char *ethaddr_str; |
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/* Check the environment variables first */ |
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ethaddr_str = prom_getenv("ethaddr"); |
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if (!ethaddr_str) { |
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/* Check command line */ |
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ethaddr_str = strstr(arcs_cmdline, "ethaddr="); |
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if (!ethaddr_str) |
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return -1; |
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ethaddr_str += strlen("ethaddr="); |
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} |
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str2eaddr(ethernet_addr, ethaddr_str); |
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return 0; |
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}
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