129 lines
3.3 KiB
C
129 lines
3.3 KiB
C
/*
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* Copyright (C) 1999, 2000, 2004, 2005 MIPS Technologies, Inc.
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* All rights reserved.
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* Authors: Carsten Langgaard <carstenl@mips.com>
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* Maciej W. Rozycki <macro@mips.com>
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* Portions copyright (C) 2009 Cisco Systems, Inc.
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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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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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* PROM library initialisation code.
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*/
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <asm/bootinfo.h>
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#include <linux/io.h>
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#include <asm/system.h>
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#include <asm/cacheflush.h>
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#include <asm/traps.h>
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#include <asm/mips-boards/prom.h>
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#include <asm/mips-boards/generic.h>
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#include <asm/mach-powertv/asic.h>
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#include "init.h"
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int prom_argc;
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int *_prom_argv, *_prom_envp;
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unsigned long _prom_memsize;
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/*
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* YAMON (32-bit PROM) pass arguments and environment as 32-bit pointer.
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* This macro take care of sign extension, if running in 64-bit mode.
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*/
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#define prom_envp(index) ((char *)(long)_prom_envp[(index)])
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char *prom_getenv(char *envname)
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{
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char *result = NULL;
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if (_prom_envp != NULL) {
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/*
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* Return a pointer to the given environment variable.
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* In 64-bit mode: we're using 64-bit pointers, but all pointers
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* in the PROM structures are only 32-bit, so we need some
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* workarounds, if we are running in 64-bit mode.
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*/
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int i, index = 0;
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i = strlen(envname);
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while (prom_envp(index)) {
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if (strncmp(envname, prom_envp(index), i) == 0) {
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result = prom_envp(index + 1);
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break;
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}
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index += 2;
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}
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}
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return result;
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}
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/* TODO: Verify on linux-mips mailing list that the following two */
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/* functions are correct */
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/* TODO: Copy NMI and EJTAG exception vectors to memory from the */
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/* BootROM exception vectors. Flush their cache entries. test it. */
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static void __init mips_nmi_setup(void)
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{
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void *base;
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#if defined(CONFIG_CPU_MIPS32_R1)
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base = cpu_has_veic ?
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(void *)(CAC_BASE + 0xa80) :
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(void *)(CAC_BASE + 0x380);
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#elif defined(CONFIG_CPU_MIPS32_R2)
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base = (void *)0xbfc00000;
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#else
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#error NMI exception handler address not defined
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#endif
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}
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static void __init mips_ejtag_setup(void)
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{
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void *base;
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#if defined(CONFIG_CPU_MIPS32_R1)
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base = cpu_has_veic ?
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(void *)(CAC_BASE + 0xa00) :
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(void *)(CAC_BASE + 0x300);
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#elif defined(CONFIG_CPU_MIPS32_R2)
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base = (void *)0xbfc00480;
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#else
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#error EJTAG exception handler address not defined
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#endif
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}
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void __init prom_init(void)
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{
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prom_argc = fw_arg0;
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_prom_argv = (int *) fw_arg1;
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_prom_envp = (int *) fw_arg2;
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_prom_memsize = (unsigned long) fw_arg3;
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board_nmi_handler_setup = mips_nmi_setup;
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board_ejtag_handler_setup = mips_ejtag_setup;
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pr_info("\nLINUX started...\n");
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prom_init_cmdline();
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configure_platform();
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prom_meminit();
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#ifndef CONFIG_BOOTLOADER_DRIVER
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pr_info("\nBootloader driver isn't loaded...\n");
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#endif
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}
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