mirror of https://gitee.com/openkylin/linux.git
320 lines
9.4 KiB
C
320 lines
9.4 KiB
C
/*
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* Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
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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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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/ioport.h>
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#include <linux/pci.h>
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#include <linux/screen_info.h>
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#include <linux/notifier.h>
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#include <linux/etherdevice.h>
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#include <linux/if_ether.h>
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#include <linux/ctype.h>
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#include <linux/cpu.h>
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#include <linux/time.h>
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#include <asm/bootinfo.h>
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#include <asm/irq.h>
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#include <asm/mips-boards/generic.h>
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#include <asm/dma.h>
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#include <asm/asm.h>
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#include <asm/traps.h>
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#include <asm/asm-offsets.h>
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#include "reset.h"
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#define VAL(n) STR(n)
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/*
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* Macros for loading addresses and storing registers:
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* LONG_L_ Stringified version of LONG_L for use in asm() statement
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* LONG_S_ Stringified version of LONG_S for use in asm() statement
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* PTR_LA_ Stringified version of PTR_LA for use in asm() statement
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* REG_SIZE Number of 8-bit bytes in a full width register
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*/
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#define LONG_L_ VAL(LONG_L) " "
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#define LONG_S_ VAL(LONG_S) " "
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#define PTR_LA_ VAL(PTR_LA) " "
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#ifdef CONFIG_64BIT
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#warning TODO: 64-bit code needs to be verified
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#define REG_SIZE "8" /* In bytes */
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#endif
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#ifdef CONFIG_32BIT
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#define REG_SIZE "4" /* In bytes */
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#endif
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static void register_panic_notifier(void);
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static int panic_handler(struct notifier_block *notifier_block,
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unsigned long event, void *cause_string);
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const char *get_system_type(void)
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{
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return "PowerTV";
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}
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void __init plat_mem_setup(void)
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{
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panic_on_oops = 1;
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register_panic_notifier();
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#if 0
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mips_pcibios_init();
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#endif
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mips_reboot_setup();
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}
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/*
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* Install a panic notifier for platform-specific diagnostics
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*/
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static void register_panic_notifier()
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{
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static struct notifier_block panic_notifier = {
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.notifier_call = panic_handler,
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.next = NULL,
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.priority = INT_MAX
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};
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atomic_notifier_chain_register(&panic_notifier_list, &panic_notifier);
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}
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static int panic_handler(struct notifier_block *notifier_block,
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unsigned long event, void *cause_string)
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{
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struct pt_regs my_regs;
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/* Save all of the registers */
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{
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unsigned long at, v0, v1; /* Must be on the stack */
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/* Start by saving $at and v0 on the stack. We use $at
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* ourselves, but it looks like the compiler may use v0 or v1
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* to load the address of the pt_regs structure. We'll come
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* back later to store the registers in the pt_regs
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* structure. */
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__asm__ __volatile__ (
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".set noat\n"
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LONG_S_ "$at, %[at]\n"
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LONG_S_ "$2, %[v0]\n"
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LONG_S_ "$3, %[v1]\n"
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:
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[at] "=m" (at),
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[v0] "=m" (v0),
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[v1] "=m" (v1)
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:
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: "at"
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);
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__asm__ __volatile__ (
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".set noat\n"
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"move $at, %[pt_regs]\n"
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/* Argument registers */
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LONG_S_ "$4, " VAL(PT_R4) "($at)\n"
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LONG_S_ "$5, " VAL(PT_R5) "($at)\n"
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LONG_S_ "$6, " VAL(PT_R6) "($at)\n"
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LONG_S_ "$7, " VAL(PT_R7) "($at)\n"
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/* Temporary regs */
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LONG_S_ "$8, " VAL(PT_R8) "($at)\n"
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LONG_S_ "$9, " VAL(PT_R9) "($at)\n"
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LONG_S_ "$10, " VAL(PT_R10) "($at)\n"
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LONG_S_ "$11, " VAL(PT_R11) "($at)\n"
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LONG_S_ "$12, " VAL(PT_R12) "($at)\n"
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LONG_S_ "$13, " VAL(PT_R13) "($at)\n"
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LONG_S_ "$14, " VAL(PT_R14) "($at)\n"
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LONG_S_ "$15, " VAL(PT_R15) "($at)\n"
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/* "Saved" registers */
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LONG_S_ "$16, " VAL(PT_R16) "($at)\n"
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LONG_S_ "$17, " VAL(PT_R17) "($at)\n"
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LONG_S_ "$18, " VAL(PT_R18) "($at)\n"
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LONG_S_ "$19, " VAL(PT_R19) "($at)\n"
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LONG_S_ "$20, " VAL(PT_R20) "($at)\n"
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LONG_S_ "$21, " VAL(PT_R21) "($at)\n"
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LONG_S_ "$22, " VAL(PT_R22) "($at)\n"
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LONG_S_ "$23, " VAL(PT_R23) "($at)\n"
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/* Add'l temp regs */
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LONG_S_ "$24, " VAL(PT_R24) "($at)\n"
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LONG_S_ "$25, " VAL(PT_R25) "($at)\n"
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/* Kernel temp regs */
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LONG_S_ "$26, " VAL(PT_R26) "($at)\n"
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LONG_S_ "$27, " VAL(PT_R27) "($at)\n"
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/* Global pointer, stack pointer, frame pointer and
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* return address */
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LONG_S_ "$gp, " VAL(PT_R28) "($at)\n"
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LONG_S_ "$sp, " VAL(PT_R29) "($at)\n"
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LONG_S_ "$fp, " VAL(PT_R30) "($at)\n"
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LONG_S_ "$ra, " VAL(PT_R31) "($at)\n"
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/* Now we can get the $at and v0 registers back and
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* store them */
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LONG_L_ "$8, %[at]\n"
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LONG_S_ "$8, " VAL(PT_R1) "($at)\n"
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LONG_L_ "$8, %[v0]\n"
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LONG_S_ "$8, " VAL(PT_R2) "($at)\n"
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LONG_L_ "$8, %[v1]\n"
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LONG_S_ "$8, " VAL(PT_R3) "($at)\n"
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:
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:
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[at] "m" (at),
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[v0] "m" (v0),
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[v1] "m" (v1),
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[pt_regs] "r" (&my_regs)
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: "at", "t0"
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);
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/* Set the current EPC value to be the current location in this
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* function */
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__asm__ __volatile__ (
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".set noat\n"
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"1:\n"
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PTR_LA_ "$at, 1b\n"
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LONG_S_ "$at, %[cp0_epc]\n"
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:
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[cp0_epc] "=m" (my_regs.cp0_epc)
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:
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: "at"
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);
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my_regs.cp0_cause = read_c0_cause();
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my_regs.cp0_status = read_c0_status();
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}
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pr_crit("I'm feeling a bit sleepy. hmmmmm... perhaps a nap would... "
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"zzzz... \n");
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return NOTIFY_DONE;
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}
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/* Information about the RF MAC address, if one was supplied on the
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* command line. */
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static bool have_rfmac;
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static u8 rfmac[ETH_ALEN];
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static int rfmac_param(char *p)
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{
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u8 *q;
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bool is_high_nibble;
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int c;
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/* Skip a leading "0x", if present */
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if (*p == '0' && *(p+1) == 'x')
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p += 2;
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q = rfmac;
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is_high_nibble = true;
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for (c = (unsigned char) *p++;
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isxdigit(c) && q - rfmac < ETH_ALEN;
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c = (unsigned char) *p++) {
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int nibble;
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nibble = (isdigit(c) ? (c - '0') :
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(isupper(c) ? c - 'A' + 10 : c - 'a' + 10));
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if (is_high_nibble)
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*q = nibble << 4;
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else
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*q++ |= nibble;
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is_high_nibble = !is_high_nibble;
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}
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/* If we parsed all the way to the end of the parameter value and
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* parsed all ETH_ALEN bytes, we have a usable RF MAC address */
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have_rfmac = (c == '\0' && q - rfmac == ETH_ALEN);
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return 0;
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}
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early_param("rfmac", rfmac_param);
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/*
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* Generate an Ethernet MAC address that has a good chance of being unique.
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* @addr: Pointer to six-byte array containing the Ethernet address
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* Generates an Ethernet MAC address that is highly likely to be unique for
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* this particular system on a network with other systems of the same type.
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*
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* The problem we are solving is that, when eth_random_addr() is used to
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* generate MAC addresses at startup, there isn't much entropy for the random
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* number generator to use and the addresses it produces are fairly likely to
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* be the same as those of other identical systems on the same local network.
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* This is true even for relatively small numbers of systems (for the reason
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* why, see the Wikipedia entry for "Birthday problem" at:
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* http://en.wikipedia.org/wiki/Birthday_problem
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*
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* The good news is that we already have a MAC address known to be unique, the
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* RF MAC address. The bad news is that this address is already in use on the
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* RF interface. Worse, the obvious trick, taking the RF MAC address and
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* turning on the locally managed bit, has already been used for other devices.
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* Still, this does give us something to work with.
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*
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* The approach we take is:
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* 1. If we can't get the RF MAC Address, just call eth_random_addr.
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* 2. Use the 24-bit NIC-specific bits of the RF MAC address as the last 24
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* bits of the new address. This is very likely to be unique, except for
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* the current box.
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* 3. To avoid using addresses already on the current box, we set the top
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* six bits of the address with a value different from any currently
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* registered Scientific Atlanta organizationally unique identifyer
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* (OUI). This avoids duplication with any addresses on the system that
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* were generated from valid Scientific Atlanta-registered address by
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* simply flipping the locally managed bit.
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* 4. We aren't generating a multicast address, so we leave the multicast
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* bit off. Since we aren't using a registered address, we have to set
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* the locally managed bit.
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* 5. We then randomly generate the remaining 16-bits. This does two
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* things:
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* a. It allows us to call this function for more than one device
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* in this system
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* b. It ensures that things will probably still work even if
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* some device on the device network has a locally managed
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* address that matches the top six bits from step 2.
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*/
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void platform_random_ether_addr(u8 addr[ETH_ALEN])
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{
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const int num_random_bytes = 2;
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const unsigned char non_sciatl_oui_bits = 0xc0u;
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const unsigned char mac_addr_locally_managed = (1 << 1);
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if (!have_rfmac) {
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pr_warning("rfmac not available on command line; "
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"generating random MAC address\n");
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eth_random_addr(addr);
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}
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else {
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int i;
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/* Set the first byte to something that won't match a Scientific
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* Atlanta OUI, is locally managed, and isn't a multicast
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* address */
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addr[0] = non_sciatl_oui_bits | mac_addr_locally_managed;
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/* Get some bytes of random address information */
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get_random_bytes(&addr[1], num_random_bytes);
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/* Copy over the NIC-specific bits of the RF MAC address */
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for (i = 1 + num_random_bytes; i < ETH_ALEN; i++)
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addr[i] = rfmac[i];
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}
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}
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