The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: stable/10/sys/mips/malta/malta_machdep.c 255088 2013-08-31 01:24:05Z gonzo $
   27  */
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: stable/10/sys/mips/malta/malta_machdep.c 255088 2013-08-31 01:24:05Z gonzo $");
   30 
   31 #include "opt_ddb.h"
   32 
   33 #include <sys/param.h>
   34 #include <sys/conf.h>
   35 #include <sys/kernel.h>
   36 #include <sys/systm.h>
   37 #include <sys/imgact.h>
   38 #include <sys/bio.h>
   39 #include <sys/buf.h>
   40 #include <sys/bus.h>
   41 #include <sys/cpu.h>
   42 #include <sys/cons.h>
   43 #include <sys/exec.h>
   44 #include <sys/ucontext.h>
   45 #include <sys/proc.h>
   46 #include <sys/kdb.h>
   47 #include <sys/ptrace.h>
   48 #include <sys/reboot.h>
   49 #include <sys/signalvar.h>
   50 #include <sys/sysent.h>
   51 #include <sys/sysproto.h>
   52 #include <sys/user.h>
   53 
   54 #include <vm/vm.h>
   55 #include <vm/vm_object.h>
   56 #include <vm/vm_page.h>
   57 
   58 #include <machine/clock.h>
   59 #include <machine/cpu.h>
   60 #include <machine/cpuregs.h>
   61 #include <machine/hwfunc.h>
   62 #include <machine/md_var.h>
   63 #include <machine/pmap.h>
   64 #include <machine/trap.h>
   65 
   66 #ifdef TICK_USE_YAMON_FREQ
   67 #include <mips/malta/yamon.h>
   68 #endif
   69 
   70 #ifdef TICK_USE_MALTA_RTC
   71 #include <mips/mips4k/malta/maltareg.h>
   72 #include <dev/mc146818/mc146818reg.h>
   73 #include <isa/rtc.h>
   74 #endif
   75 
   76 #include <mips/malta/maltareg.h>
   77 
   78 extern int      *edata;
   79 extern int      *end;
   80 
   81 void    lcd_init(void);
   82 void    lcd_puts(char *);
   83 void    malta_reset(void);
   84 
   85 /*
   86  * Temporary boot environment used at startup.
   87  */
   88 static char boot1_env[4096];
   89 
   90 /*
   91  * Offsets to MALTA LCD characters.
   92  */
   93 static int malta_lcd_offs[] = {
   94         MALTA_ASCIIPOS0,
   95         MALTA_ASCIIPOS1,
   96         MALTA_ASCIIPOS2,
   97         MALTA_ASCIIPOS3,
   98         MALTA_ASCIIPOS4,
   99         MALTA_ASCIIPOS5,
  100         MALTA_ASCIIPOS6,
  101         MALTA_ASCIIPOS7
  102 };
  103 
  104 void
  105 platform_cpu_init()
  106 {
  107         /* Nothing special */
  108 }
  109 
  110 /*
  111  * Put character to Malta LCD at given position.
  112  */
  113 static void
  114 malta_lcd_putc(int pos, char c)
  115 {
  116         void *addr;
  117         char *ch;
  118 
  119         if (pos < 0 || pos > 7)
  120                 return;
  121         addr = (void *)(MALTA_ASCII_BASE + malta_lcd_offs[pos]);
  122         ch = (char *)MIPS_PHYS_TO_KSEG0(addr);
  123         *ch = c;
  124 }
  125 
  126 /*
  127  * Print given string on LCD.
  128  */
  129 static void
  130 malta_lcd_print(char *str)
  131 {
  132         int i;
  133         
  134         if (str == NULL)
  135                 return;
  136 
  137         for (i = 0; *str != '\0'; i++, str++)
  138                 malta_lcd_putc(i, *str);
  139 }
  140 
  141 void
  142 lcd_init(void)
  143 {
  144         malta_lcd_print("FreeBSD_");
  145 }
  146 
  147 void
  148 lcd_puts(char *s)
  149 {
  150         malta_lcd_print(s);
  151 }
  152 
  153 #ifdef TICK_USE_MALTA_RTC
  154 static __inline uint8_t
  155 rtcin(uint8_t addr)
  156 {
  157 
  158         *((volatile uint8_t *)
  159             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
  160         return (*((volatile uint8_t *)
  161             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))));
  162 }
  163 
  164 static __inline void
  165 writertc(uint8_t addr, uint8_t val)
  166 {
  167 
  168         *((volatile uint8_t *)
  169             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
  170         *((volatile uint8_t *)
  171             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))) = val;
  172 }
  173 #endif
  174 
  175 static void
  176 mips_init(void)
  177 {
  178         int i;
  179 
  180         for (i = 0; i < 10; i++) {
  181                 phys_avail[i] = 0;
  182         }
  183 
  184         /* phys_avail regions are in bytes */
  185         phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
  186         phys_avail[1] = ctob(realmem);
  187 
  188         dump_avail[0] = phys_avail[0];
  189         dump_avail[1] = phys_avail[1];
  190 
  191         physmem = realmem;
  192 
  193         init_param1();
  194         init_param2(physmem);
  195         mips_cpu_init();
  196         pmap_bootstrap();
  197         mips_proc0_init();
  198         mutex_init();
  199         kdb_init();
  200 #ifdef KDB
  201         if (boothowto & RB_KDB)
  202                 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
  203 #endif
  204 }
  205 
  206 /*
  207  * Perform a board-level soft-reset.
  208  * Note that this is not emulated by gxemul.
  209  */
  210 void
  211 platform_reset(void)
  212 {
  213         char *c;
  214 
  215         c = (char *)MIPS_PHYS_TO_KSEG0(MALTA_SOFTRES);
  216         *c = MALTA_GORESET;
  217 }
  218 
  219 static uint64_t
  220 malta_cpu_freq(void)
  221 {
  222         uint64_t platform_counter_freq = 0;
  223 
  224 #if defined(TICK_USE_YAMON_FREQ)
  225         /*
  226          * If we are running on a board which uses YAMON firmware,
  227          * then query CPU pipeline clock from the syscon object.
  228          * If unsuccessful, use hard-coded default.
  229          */
  230         platform_counter_freq = yamon_getcpufreq();
  231 
  232 #elif defined(TICK_USE_MALTA_RTC)
  233         /*
  234          * If we are running on a board with the MC146818 RTC,
  235          * use it to determine CPU pipeline clock frequency.
  236          */
  237         u_int64_t counterval[2];
  238 
  239         /* Set RTC to binary mode. */
  240         writertc(RTC_STATUSB, (rtcin(RTC_STATUSB) | RTCSB_BCD));
  241 
  242         /* Busy-wait for falling edge of RTC update. */
  243         while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
  244                 ;
  245         while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
  246                 ;
  247         counterval[0] = mips_rd_count();
  248 
  249         /* Busy-wait for falling edge of RTC update. */
  250         while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
  251                 ;
  252         while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
  253                 ;
  254         counterval[1] = mips_rd_count();
  255 
  256         platform_counter_freq = counterval[1] - counterval[0];
  257 #endif
  258 
  259         if (platform_counter_freq == 0)
  260                 platform_counter_freq = MIPS_DEFAULT_HZ;
  261 
  262         return (platform_counter_freq);
  263 }
  264 
  265 void
  266 platform_start(__register_t a0, __register_t a1,  __register_t a2, 
  267     __register_t a3)
  268 {
  269         vm_offset_t kernend;
  270         uint64_t platform_counter_freq;
  271         int argc = a0;
  272         int32_t *argv = (int32_t*)a1;
  273         int32_t *envp = (int32_t*)a2;
  274         unsigned int memsize = a3;
  275         int i;
  276 
  277         /* clear the BSS and SBSS segments */
  278         kernend = (vm_offset_t)&end;
  279         memset(&edata, 0, kernend - (vm_offset_t)(&edata));
  280 
  281         mips_postboot_fixup();
  282 
  283         mips_pcpu0_init();
  284         platform_counter_freq = malta_cpu_freq();
  285         mips_timer_early_init(platform_counter_freq);
  286         init_static_kenv(boot1_env, sizeof(boot1_env));
  287 
  288         cninit();
  289         printf("entry: platform_start()\n");
  290 
  291         bootverbose = 1;
  292         /* 
  293          * YAMON uses 32bit pointers to strings so
  294          * convert them to proper type manually
  295          */
  296         if (bootverbose) {
  297                 printf("cmd line: ");
  298                 for (i = 0; i < argc; i++)
  299                         printf("%s ", (char*)(intptr_t)argv[i]);
  300                 printf("\n");
  301 
  302                 printf("envp:\n");
  303                 for (i = 0; envp[i]; i += 2)
  304                         printf("\t%s = %s\n", (char*)(intptr_t)envp[i],
  305                             (char*)(intptr_t)envp[i+1]);
  306 
  307                 printf("memsize = %08x\n", memsize);
  308         }
  309 
  310         realmem = btoc(memsize);
  311         mips_init();
  312 
  313         mips_timer_init_params(platform_counter_freq, 0);
  314 }

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