FreeBSD/Linux Kernel Cross Reference
sys/mips/malta/malta_machdep.c

     /*-
      * Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/10.2/sys/mips/malta/malta_machdep.c 255088 2013-08-31 01:24:05Z gonzo $
     */
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/10.2/sys/mips/malta/malta_machdep.c 255088 2013-08-31 01:24:05Z gonzo $");
    
    #include "opt_ddb.h"
    
    #include <sys/param.h>
    #include <sys/conf.h>
    #include <sys/kernel.h>
    #include <sys/systm.h>
    #include <sys/imgact.h>
    #include <sys/bio.h>
    #include <sys/buf.h>
    #include <sys/bus.h>
    #include <sys/cpu.h>
    #include <sys/cons.h>
    #include <sys/exec.h>
    #include <sys/ucontext.h>
    #include <sys/proc.h>
    #include <sys/kdb.h>
    #include <sys/ptrace.h>
    #include <sys/reboot.h>
    #include <sys/signalvar.h>
    #include <sys/sysent.h>
    #include <sys/sysproto.h>
    #include <sys/user.h>
    
    #include <vm/vm.h>
    #include <vm/vm_object.h>
    #include <vm/vm_page.h>
    
    #include <machine/clock.h>
    #include <machine/cpu.h>
    #include <machine/cpuregs.h>
    #include <machine/hwfunc.h>
    #include <machine/md_var.h>
    #include <machine/pmap.h>
    #include <machine/trap.h>
    
    #ifdef TICK_USE_YAMON_FREQ
    #include <mips/malta/yamon.h>
    #endif
    
    #ifdef TICK_USE_MALTA_RTC
    #include <mips/mips4k/malta/maltareg.h>
    #include <dev/mc146818/mc146818reg.h>
    #include <isa/rtc.h>
    #endif
    
    #include <mips/malta/maltareg.h>
    
    extern int      *edata;
    extern int      *end;
    
    void    lcd_init(void);
    void    lcd_puts(char *);
    void    malta_reset(void);
    
    /*
     * Temporary boot environment used at startup.
     */
    static char boot1_env[4096];
    
    /*
     * Offsets to MALTA LCD characters.
     */
    static int malta_lcd_offs[] = {
            MALTA_ASCIIPOS0,
            MALTA_ASCIIPOS1,
            MALTA_ASCIIPOS2,
            MALTA_ASCIIPOS3,
            MALTA_ASCIIPOS4,
            MALTA_ASCIIPOS5,
           MALTA_ASCIIPOS6,
           MALTA_ASCIIPOS7
   };
   
   void
   platform_cpu_init()
   {
           /* Nothing special */
   }
   
   /*
    * Put character to Malta LCD at given position.
    */
   static void
   malta_lcd_putc(int pos, char c)
   {
           void *addr;
           char *ch;
   
           if (pos < 0 || pos > 7)
                   return;
           addr = (void *)(MALTA_ASCII_BASE + malta_lcd_offs[pos]);
           ch = (char *)MIPS_PHYS_TO_KSEG0(addr);
           *ch = c;
   }
   
   /*
    * Print given string on LCD.
    */
   static void
   malta_lcd_print(char *str)
   {
           int i;
           
           if (str == NULL)
                   return;
   
           for (i = 0; *str != '\0'; i++, str++)
                   malta_lcd_putc(i, *str);
   }
   
   void
   lcd_init(void)
   {
           malta_lcd_print("FreeBSD_");
   }
   
   void
   lcd_puts(char *s)
   {
           malta_lcd_print(s);
   }
   
   #ifdef TICK_USE_MALTA_RTC
   static __inline uint8_t
   rtcin(uint8_t addr)
   {
   
           *((volatile uint8_t *)
               MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
           return (*((volatile uint8_t *)
               MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))));
   }
   
   static __inline void
   writertc(uint8_t addr, uint8_t val)
   {
   
           *((volatile uint8_t *)
               MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
           *((volatile uint8_t *)
               MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))) = val;
   }
   #endif
   
   static void
   mips_init(void)
   {
           int i;
   
           for (i = 0; i < 10; i++) {
                   phys_avail[i] = 0;
           }
   
           /* phys_avail regions are in bytes */
           phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
           phys_avail[1] = ctob(realmem);
   
           dump_avail[0] = phys_avail[0];
           dump_avail[1] = phys_avail[1];
   
           physmem = realmem;
   
           init_param1();
           init_param2(physmem);
           mips_cpu_init();
           pmap_bootstrap();
           mips_proc0_init();
           mutex_init();
           kdb_init();
   #ifdef KDB
           if (boothowto & RB_KDB)
                   kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
   #endif
   }
   
   /*
    * Perform a board-level soft-reset.
    * Note that this is not emulated by gxemul.
    */
   void
   platform_reset(void)
   {
           char *c;
   
           c = (char *)MIPS_PHYS_TO_KSEG0(MALTA_SOFTRES);
           *c = MALTA_GORESET;
   }
   
   static uint64_t
   malta_cpu_freq(void)
   {
           uint64_t platform_counter_freq = 0;
   
   #if defined(TICK_USE_YAMON_FREQ)
           /*
            * If we are running on a board which uses YAMON firmware,
            * then query CPU pipeline clock from the syscon object.
            * If unsuccessful, use hard-coded default.
            */
           platform_counter_freq = yamon_getcpufreq();
   
   #elif defined(TICK_USE_MALTA_RTC)
           /*
            * If we are running on a board with the MC146818 RTC,
            * use it to determine CPU pipeline clock frequency.
            */
           u_int64_t counterval[2];
   
           /* Set RTC to binary mode. */
           writertc(RTC_STATUSB, (rtcin(RTC_STATUSB) | RTCSB_BCD));
   
           /* Busy-wait for falling edge of RTC update. */
           while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
                   ;
           while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
                   ;
           counterval[0] = mips_rd_count();
   
           /* Busy-wait for falling edge of RTC update. */
           while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
                   ;
           while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
                   ;
           counterval[1] = mips_rd_count();
   
           platform_counter_freq = counterval[1] - counterval[0];
   #endif
   
           if (platform_counter_freq == 0)
                   platform_counter_freq = MIPS_DEFAULT_HZ;
   
           return (platform_counter_freq);
   }
   
   void
   platform_start(__register_t a0, __register_t a1,  __register_t a2, 
       __register_t a3)
   {
           vm_offset_t kernend;
           uint64_t platform_counter_freq;
           int argc = a0;
           int32_t *argv = (int32_t*)a1;
           int32_t *envp = (int32_t*)a2;
           unsigned int memsize = a3;
           int i;
   
           /* clear the BSS and SBSS segments */
           kernend = (vm_offset_t)&end;
           memset(&edata, 0, kernend - (vm_offset_t)(&edata));
   
           mips_postboot_fixup();
   
           mips_pcpu0_init();
           platform_counter_freq = malta_cpu_freq();
           mips_timer_early_init(platform_counter_freq);
           init_static_kenv(boot1_env, sizeof(boot1_env));
   
           cninit();
           printf("entry: platform_start()\n");
   
           bootverbose = 1;
           /* 
            * YAMON uses 32bit pointers to strings so
            * convert them to proper type manually
            */
           if (bootverbose) {
                   printf("cmd line: ");
                   for (i = 0; i < argc; i++)
                           printf("%s ", (char*)(intptr_t)argv[i]);
                   printf("\n");
   
                   printf("envp:\n");
                   for (i = 0; envp[i]; i += 2)
                           printf("\t%s = %s\n", (char*)(intptr_t)envp[i],
                               (char*)(intptr_t)envp[i+1]);
   
                   printf("memsize = %08x\n", memsize);
           }
   
           realmem = btoc(memsize);
           mips_init();
   
           mips_timer_init_params(platform_counter_freq, 0);
   }

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