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  * $FreeBSD$
   29  */
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   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_param.h>
   58 #include <vm/vm_object.h>
   59 #include <vm/vm_page.h>
   60 #include <vm/vm_phys.h>
   61 #include <vm/vm_dumpset.h>
   62 
   63 #include <machine/clock.h>
   64 #include <machine/cpu.h>
   65 #include <machine/cpuregs.h>
   66 #include <machine/hwfunc.h>
   67 #include <machine/md_var.h>
   68 #include <machine/pmap.h>
   69 #include <machine/trap.h>
   70 
   71 #ifdef TICK_USE_YAMON_FREQ
   72 #include <mips/malta/yamon.h>
   73 #endif
   74 
   75 #ifdef TICK_USE_MALTA_RTC
   76 #include <mips/malta/maltareg.h>
   77 #include <isa/rtc.h>
   78 #endif
   79 
   80 #include <mips/malta/maltareg.h>
   81 
   82 extern int      *edata;
   83 extern int      *end;
   84 
   85 void    lcd_init(void);
   86 void    lcd_puts(char *);
   87 void    malta_reset(void);
   88 
   89 /*
   90  * Temporary boot environment used at startup.
   91  */
   92 static char boot1_env[4096];
   93 
   94 /*
   95  * Offsets to MALTA LCD characters.
   96  */
   97 static int malta_lcd_offs[] = {
   98         MALTA_ASCIIPOS0,
   99         MALTA_ASCIIPOS1,
  100         MALTA_ASCIIPOS2,
  101         MALTA_ASCIIPOS3,
  102         MALTA_ASCIIPOS4,
  103         MALTA_ASCIIPOS5,
  104         MALTA_ASCIIPOS6,
  105         MALTA_ASCIIPOS7
  106 };
  107 
  108 void
  109 platform_cpu_init()
  110 {
  111         /* Nothing special */
  112 }
  113 
  114 /*
  115  * Put character to Malta LCD at given position.
  116  */
  117 static void
  118 malta_lcd_putc(int pos, char c)
  119 {
  120         void *addr;
  121         char *ch;
  122 
  123         if (pos < 0 || pos > 7)
  124                 return;
  125         addr = (void *)(MALTA_ASCII_BASE + malta_lcd_offs[pos]);
  126         ch = (char *)MIPS_PHYS_TO_KSEG0(addr);
  127         *ch = c;
  128 }
  129 
  130 /*
  131  * Print given string on LCD.
  132  */
  133 static void
  134 malta_lcd_print(char *str)
  135 {
  136         int i;
  137 
  138         if (str == NULL)
  139                 return;
  140 
  141         for (i = 0; *str != '\0'; i++, str++)
  142                 malta_lcd_putc(i, *str);
  143 }
  144 
  145 void
  146 lcd_init(void)
  147 {
  148         malta_lcd_print("FreeBSD_");
  149 }
  150 
  151 void
  152 lcd_puts(char *s)
  153 {
  154         malta_lcd_print(s);
  155 }
  156 
  157 #ifdef TICK_USE_MALTA_RTC
  158 static __inline uint8_t
  159 malta_rtcin(uint8_t addr)
  160 {
  161 
  162         *((volatile uint8_t *)
  163             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
  164         return (*((volatile uint8_t *)
  165             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))));
  166 }
  167 
  168 static __inline void
  169 malta_writertc(uint8_t addr, uint8_t val)
  170 {
  171 
  172         *((volatile uint8_t *)
  173             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
  174         *((volatile uint8_t *)
  175             MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))) = val;
  176 }
  177 #endif
  178 
  179 static void
  180 mips_init(unsigned long memsize, uint64_t ememsize)
  181 {
  182         int i;
  183 
  184         for (i = 0; i < PHYS_AVAIL_ENTRIES; i++) {
  185                 phys_avail[i] = 0;
  186         }
  187 
  188         /*
  189          * memsize is the amount of RAM available below 256MB.
  190          * ememsize is the total amount of RAM available.
  191          *
  192          * The second bank starts at 0x90000000.
  193          */
  194 
  195         /* phys_avail regions are in bytes */
  196         phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
  197         phys_avail[1] = memsize;
  198         dump_avail[0] = 0;
  199         dump_avail[1] = phys_avail[1];
  200 
  201         /* Only specify the extended region if it's set */
  202         if (ememsize > memsize) {
  203                 phys_avail[2] = 0x90000000;
  204                 phys_avail[3] = 0x90000000 + (ememsize - memsize);
  205                 dump_avail[2] = phys_avail[2];
  206                 dump_avail[3] = phys_avail[3];
  207         }
  208 
  209         /* XXX realmem assigned in the caller of mips_init() */
  210         physmem = realmem;
  211 
  212         init_param1();
  213         init_param2(physmem);
  214         mips_cpu_init();
  215         pmap_bootstrap();
  216         mips_proc0_init();
  217         mutex_init();
  218         kdb_init();
  219 #ifdef KDB
  220         if (boothowto & RB_KDB)
  221                 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
  222 #endif
  223 }
  224 
  225 /*
  226  * Perform a board-level soft-reset.
  227  * Note that this is not emulated by gxemul.
  228  */
  229 void
  230 platform_reset(void)
  231 {
  232         char *c;
  233 
  234         c = (char *)MIPS_PHYS_TO_KSEG0(MALTA_SOFTRES);
  235         *c = MALTA_GORESET;
  236 }
  237 
  238 static uint64_t
  239 malta_cpu_freq(void)
  240 {
  241         uint64_t platform_counter_freq = 0;
  242 
  243 #if defined(TICK_USE_YAMON_FREQ)
  244         /*
  245          * If we are running on a board which uses YAMON firmware,
  246          * then query CPU pipeline clock from the syscon object.
  247          * If unsuccessful, use hard-coded default.
  248          */
  249         platform_counter_freq = yamon_getcpufreq();
  250 
  251 #elif defined(TICK_USE_MALTA_RTC)
  252         /*
  253          * If we are running on a board with the MC146818 RTC,
  254          * use it to determine CPU pipeline clock frequency.
  255          */
  256         u_int64_t counterval[2];
  257 
  258         /* Set RTC to binary mode. */
  259         malta_writertc(RTC_STATUSB, (malta_rtcin(RTC_STATUSB) | RTCSB_BCD));
  260 
  261         /* Busy-wait for falling edge of RTC update. */
  262         while (((malta_rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
  263                 ;
  264         while (((malta_rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
  265                 ;
  266         counterval[0] = mips_rd_count();
  267 
  268         /* Busy-wait for falling edge of RTC update. */
  269         while (((malta_rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
  270                 ;
  271         while (((malta_rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
  272                 ;
  273         counterval[1] = mips_rd_count();
  274 
  275         platform_counter_freq = counterval[1] - counterval[0];
  276 #endif
  277 
  278         if (platform_counter_freq == 0)
  279                 platform_counter_freq = MIPS_DEFAULT_HZ;
  280 
  281         return (platform_counter_freq);
  282 }
  283 
  284 void
  285 platform_start(__register_t a0, __register_t a1,  __register_t a2, 
  286     __register_t a3)
  287 {
  288         vm_offset_t kernend;
  289         uint64_t platform_counter_freq;
  290         int argc = a0;
  291         int32_t *argv = (int32_t*)a1;
  292         int32_t *envp = (int32_t*)a2;
  293         unsigned int memsize = a3;
  294         uint64_t ememsize = 0;
  295         int i;
  296 
  297         /* clear the BSS and SBSS segments */
  298         kernend = (vm_offset_t)&end;
  299         memset(&edata, 0, kernend - (vm_offset_t)(&edata));
  300 
  301         mips_postboot_fixup();
  302 
  303         mips_pcpu0_init();
  304         platform_counter_freq = malta_cpu_freq();
  305         mips_timer_early_init(platform_counter_freq);
  306         init_static_kenv(boot1_env, sizeof(boot1_env));
  307 
  308         cninit();
  309         printf("entry: platform_start()\n");
  310 
  311         bootverbose = 1;
  312 
  313         /* 
  314          * YAMON uses 32bit pointers to strings so
  315          * convert them to proper type manually
  316          */
  317 
  318         if (bootverbose) {
  319                 printf("cmd line: ");
  320                 for (i = 0; i < argc; i++)
  321                         printf("%s ", (char*)(intptr_t)argv[i]);
  322                 printf("\n");
  323         }
  324 
  325         if (bootverbose)
  326                 printf("envp:\n");
  327 
  328         /*
  329          * Parse the environment for things like ememsize.
  330          */
  331         for (i = 0; envp[i]; i += 2) {
  332                 const char *a, *v;
  333 
  334                 a = (char *)(intptr_t)envp[i];
  335                 v = (char *)(intptr_t)envp[i+1];
  336 
  337                 if (bootverbose)
  338                         printf("\t%s = %s\n", a, v);
  339 
  340                 if (strcmp(a, "ememsize") == 0) {
  341                         ememsize = strtoul(v, NULL, 0);
  342                 }
  343         }
  344 
  345         if (bootverbose) {
  346                 printf("memsize = %llu (0x%08x)\n",
  347                     (unsigned long long) memsize, memsize);
  348                 printf("ememsize = %llu\n", (unsigned long long) ememsize);
  349 
  350 #ifdef __mips_o32
  351                 /*
  352                  * For O32 phys_avail[] can't address memory beyond 2^32,
  353                  * so cap extended memory to 2GB minus one page.
  354                  */
  355                 if (ememsize >= 2ULL * 1024 * 1024 * 1024)
  356                         ememsize = 2ULL * 1024 * 1024 * 1024 - PAGE_SIZE;
  357 #endif
  358         }
  359 
  360         /*
  361          * For <= 256MB RAM amounts, ememsize should equal memsize.
  362          * For > 256MB RAM amounts it's the total RAM available;
  363          * split between two banks.
  364          *
  365          * XXX TODO: just push realmem assignment into mips_init() ?
  366          */
  367         realmem = btoc(ememsize);
  368         mips_init(memsize, ememsize);
  369 
  370         mips_timer_init_params(platform_counter_freq, 0);
  371 }
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FreeBSD/Linux Kernel Cross Reference sys/mips/malta/malta_machdep.c

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sys/mips/malta/malta_machdep.c
