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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/12.0/sys/mips/malta/malta_machdep.c 335783 2018-06-28 21:27:34Z jhb $
   29  */
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/12.0/sys/mips/malta/malta_machdep.c 335783 2018-06-28 21:27:34Z jhb $");
   32 
   33 #include "opt_ddb.h"
   34 
   35 #include <sys/param.h>
   36 #include <sys/conf.h>
   37 #include <sys/kernel.h>
   38 #include <sys/systm.h>
   39 #include <sys/imgact.h>
   40 #include <sys/bio.h>
   41 #include <sys/buf.h>
   42 #include <sys/bus.h>
   43 #include <sys/cpu.h>
   44 #include <sys/cons.h>
   45 #include <sys/exec.h>
   46 #include <sys/ucontext.h>
   47 #include <sys/proc.h>
   48 #include <sys/kdb.h>
   49 #include <sys/ptrace.h>
   50 #include <sys/reboot.h>
   51 #include <sys/signalvar.h>
   52 #include <sys/sysent.h>
   53 #include <sys/sysproto.h>
   54 #include <sys/user.h>
   55 
   56 #include <vm/vm.h>
   57 #include <vm/vm_object.h>
   58 #include <vm/vm_page.h>
   59 
   60 #include <machine/clock.h>
   61 #include <machine/cpu.h>
   62 #include <machine/cpuregs.h>
   63 #include <machine/hwfunc.h>
   64 #include <machine/md_var.h>
   65 #include <machine/pmap.h>
   66 #include <machine/trap.h>
   67 
   68 #ifdef TICK_USE_YAMON_FREQ
   69 #include <mips/malta/yamon.h>
   70 #endif
   71 
   72 #ifdef TICK_USE_MALTA_RTC
   73 #include <mips/mips4k/malta/maltareg.h>
   74 #include <dev/mc146818/mc146818reg.h>
   75 #include <isa/rtc.h>
   76 #endif
   77 
   78 #include <mips/malta/maltareg.h>
   79 
   80 extern int      *edata;
   81 extern int      *end;
   82 
   83 void    lcd_init(void);
   84 void    lcd_puts(char *);
   85 void    malta_reset(void);
   86 
   87 /*
   88  * Temporary boot environment used at startup.
   89  */
   90 static char boot1_env[4096];
   91 
   92 /*
   93  * Offsets to MALTA LCD characters.
   94  */
   95 static int malta_lcd_offs[] = {
   96         MALTA_ASCIIPOS0,
   97         MALTA_ASCIIPOS1,
   98         MALTA_ASCIIPOS2,
   99         MALTA_ASCIIPOS3,
  100         MALTA_ASCIIPOS4,
  101         MALTA_ASCIIPOS5,
  102         MALTA_ASCIIPOS6,
  103         MALTA_ASCIIPOS7
  104 };
  105 
  106 void
  107 platform_cpu_init()
  108 {
  109         /* Nothing special */
  110 }
  111 
  112 /*
  113  * Put character to Malta LCD at given position.
  114  */
  115 static void
  116 malta_lcd_putc(int pos, char c)
  117 {
  118         void *addr;
  119         char *ch;
  120 
  121         if (pos < 0 || pos > 7)
  122                 return;
  123         addr = (void *)(MALTA_ASCII_BASE + malta_lcd_offs[pos]);
  124         ch = (char *)MIPS_PHYS_TO_KSEG0(addr);
  125         *ch = c;
  126 }
  127 
  128 /*
  129  * Print given string on LCD.
  130  */
  131 static void
  132 malta_lcd_print(char *str)
  133 {
  134         int i;
  135         
  136         if (str == NULL)
  137                 return;
  138 
  139         for (i = 0; *str != '\0'; i++, str++)
  140                 malta_lcd_putc(i, *str);
  141 }
  142 
  143 void
  144 lcd_init(void)
  145 {
  146         malta_lcd_print("FreeBSD_");
  147 }
  148 
  149 void
  150 lcd_puts(char *s)
  151 {
  152         malta_lcd_print(s);
  153 }
  154 
  155 #ifdef TICK_USE_MALTA_RTC
  156 static __inline uint8_t
  157 rtcin(uint8_t addr)
  158 {
  159 
  160         *((volatile uint8_t *)
  161             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
  162         return (*((volatile uint8_t *)
  163             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))));
  164 }
  165 
  166 static __inline void
  167 writertc(uint8_t addr, uint8_t val)
  168 {
  169 
  170         *((volatile uint8_t *)
  171             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
  172         *((volatile uint8_t *)
  173             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))) = val;
  174 }
  175 #endif
  176 
  177 static void
  178 mips_init(unsigned long memsize, uint64_t ememsize)
  179 {
  180         int i;
  181 
  182         for (i = 0; i < PHYS_AVAIL_ENTRIES; i++) {
  183                 phys_avail[i] = 0;
  184         }
  185 
  186         /*
  187          * memsize is the amount of RAM available below 256MB.
  188          * ememsize is the total amount of RAM available.
  189          *
  190          * The second bank starts at 0x90000000.
  191          */
  192 
  193         /* phys_avail regions are in bytes */
  194         phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
  195         phys_avail[1] = memsize;
  196         dump_avail[0] = 0;
  197         dump_avail[1] = phys_avail[1];
  198 
  199         /* Only specify the extended region if it's set */
  200         if (ememsize > memsize) {
  201                 phys_avail[2] = 0x90000000;
  202                 phys_avail[3] = 0x90000000 + (ememsize - memsize);
  203                 dump_avail[2] = phys_avail[2];
  204                 dump_avail[3] = phys_avail[3];
  205         }
  206 
  207         /* XXX realmem assigned in the caller of mips_init() */
  208         physmem = realmem;
  209 
  210         init_param1();
  211         init_param2(physmem);
  212         mips_cpu_init();
  213         pmap_bootstrap();
  214         mips_proc0_init();
  215         mutex_init();
  216         kdb_init();
  217 #ifdef KDB
  218         if (boothowto & RB_KDB)
  219                 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
  220 #endif
  221 }
  222 
  223 /*
  224  * Perform a board-level soft-reset.
  225  * Note that this is not emulated by gxemul.
  226  */
  227 void
  228 platform_reset(void)
  229 {
  230         char *c;
  231 
  232         c = (char *)MIPS_PHYS_TO_KSEG0(MALTA_SOFTRES);
  233         *c = MALTA_GORESET;
  234 }
  235 
  236 static uint64_t
  237 malta_cpu_freq(void)
  238 {
  239         uint64_t platform_counter_freq = 0;
  240 
  241 #if defined(TICK_USE_YAMON_FREQ)
  242         /*
  243          * If we are running on a board which uses YAMON firmware,
  244          * then query CPU pipeline clock from the syscon object.
  245          * If unsuccessful, use hard-coded default.
  246          */
  247         platform_counter_freq = yamon_getcpufreq();
  248 
  249 #elif defined(TICK_USE_MALTA_RTC)
  250         /*
  251          * If we are running on a board with the MC146818 RTC,
  252          * use it to determine CPU pipeline clock frequency.
  253          */
  254         u_int64_t counterval[2];
  255 
  256         /* Set RTC to binary mode. */
  257         writertc(RTC_STATUSB, (rtcin(RTC_STATUSB) | RTCSB_BCD));
  258 
  259         /* Busy-wait for falling edge of RTC update. */
  260         while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
  261                 ;
  262         while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
  263                 ;
  264         counterval[0] = mips_rd_count();
  265 
  266         /* Busy-wait for falling edge of RTC update. */
  267         while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
  268                 ;
  269         while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
  270                 ;
  271         counterval[1] = mips_rd_count();
  272 
  273         platform_counter_freq = counterval[1] - counterval[0];
  274 #endif
  275 
  276         if (platform_counter_freq == 0)
  277                 platform_counter_freq = MIPS_DEFAULT_HZ;
  278 
  279         return (platform_counter_freq);
  280 }
  281 
  282 void
  283 platform_start(__register_t a0, __register_t a1,  __register_t a2, 
  284     __register_t a3)
  285 {
  286         vm_offset_t kernend;
  287         uint64_t platform_counter_freq;
  288         int argc = a0;
  289         int32_t *argv = (int32_t*)a1;
  290         int32_t *envp = (int32_t*)a2;
  291         unsigned int memsize = a3;
  292         uint64_t ememsize = 0;
  293         int i;
  294 
  295         /* clear the BSS and SBSS segments */
  296         kernend = (vm_offset_t)&end;
  297         memset(&edata, 0, kernend - (vm_offset_t)(&edata));
  298 
  299         mips_postboot_fixup();
  300 
  301         mips_pcpu0_init();
  302         platform_counter_freq = malta_cpu_freq();
  303         mips_timer_early_init(platform_counter_freq);
  304         init_static_kenv(boot1_env, sizeof(boot1_env));
  305 
  306         cninit();
  307         printf("entry: platform_start()\n");
  308 
  309         bootverbose = 1;
  310 
  311         /* 
  312          * YAMON uses 32bit pointers to strings so
  313          * convert them to proper type manually
  314          */
  315 
  316         if (bootverbose) {
  317                 printf("cmd line: ");
  318                 for (i = 0; i < argc; i++)
  319                         printf("%s ", (char*)(intptr_t)argv[i]);
  320                 printf("\n");
  321         }
  322 
  323         if (bootverbose)
  324                 printf("envp:\n");
  325 
  326         /*
  327          * Parse the environment for things like ememsize.
  328          */
  329         for (i = 0; envp[i]; i += 2) {
  330                 const char *a, *v;
  331 
  332                 a = (char *)(intptr_t)envp[i];
  333                 v = (char *)(intptr_t)envp[i+1];
  334 
  335                 if (bootverbose)
  336                         printf("\t%s = %s\n", a, v);
  337 
  338                 if (strcmp(a, "ememsize") == 0) {
  339                         ememsize = strtoul(v, NULL, 0);
  340                 }
  341         }
  342 
  343         if (bootverbose) {
  344                 printf("memsize = %llu (0x%08x)\n",
  345                     (unsigned long long) memsize, memsize);
  346                 printf("ememsize = %llu\n", (unsigned long long) ememsize);
  347 
  348 #ifdef __mips_o32
  349                 /*
  350                  * For O32 phys_avail[] can't address memory beyond 2^32,
  351                  * so cap extended memory to 2GB minus one page.
  352                  */
  353                 if (ememsize >= 2ULL * 1024 * 1024 * 1024)
  354                         ememsize = 2ULL * 1024 * 1024 * 1024 - PAGE_SIZE;
  355 #endif
  356         }
  357 
  358         /*
  359          * For <= 256MB RAM amounts, ememsize should equal memsize.
  360          * For > 256MB RAM amounts it's the total RAM available;
  361          * split between two banks.
  362          *
  363          * XXX TODO: just push realmem assignment into mips_init() ?
  364          */
  365         realmem = btoc(ememsize);
  366         mips_init(memsize, ememsize);
  367 
  368         mips_timer_init_params(platform_counter_freq, 0);
  369 }

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