/*      $NetBSD: machdep.c,v 1.82 2024/03/05 14:15:33 thorpej Exp $     */

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department, The Mach Operating System project at
 * Carnegie-Mellon University and Ralph Campbell.
 *
 * 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *      @(#)machdep.c   8.3 (Berkeley) 1/12/94
 */

#include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */

__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.82 2024/03/05 14:15:33 thorpej Exp $");

/* from: Utah Hdr: machdep.c 1.63 91/04/24 */

#include "opt_ddb.h"
#include "opt_kgdb.h"
#include "opt_modular.h"
#include "opt_execfmt.h"

#include "zsc.h"                        /* XXX */
#include "com.h"                        /* XXX */
#include "ksyms.h"

#include <sys/param.h>
#include <sys/boot_flag.h>
#include <sys/conf.h>
#include <sys/cpu.h>
#include <sys/device.h>
#include <sys/intr.h>
#include <sys/kcore.h>
#include <sys/ksyms.h>
#include <sys/kernel.h>
#include <sys/reboot.h>
#include <sys/systm.h>

#include <uvm/uvm_extern.h>

#include <ufs/mfs/mfs_extern.h>         /* mfs_initminiroot() */

#include <dev/clock_subr.h>
#include <dev/cons.h>

#ifdef DDB
#include <machine/db_machdep.h>
#include <ddb/db_extern.h>
#endif

#include <machine/mainboard.h>
#include <machine/sysconf.h>
#include <machine/autoconf.h>
#include <machine/bootinfo.h>
#include <machine/prom.h>

/* maps for VM objects */

struct vm_map *phys_map = NULL;

char    *bootinfo = NULL;       /* pointer to bootinfo structure */

phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];
int mem_cluster_cnt;

void to_monitor(int) __dead;
void prom_halt(int) __dead;

#ifdef  KGDB
void zs_kgdb_init(void);
void kgdb_connect(int);
#endif

/*
 *  Local functions.
 */
int initcpu(void);
void configure(void);

void mach_init(int, char *[], char*[], u_int, char *);
int  memsize_scan(void *);

#ifdef DEBUG
/* stacktrace code violates prototypes to get callee's registers */
extern void stacktrace(void); /*XXX*/
#endif

/* locore callback-vector setup */
extern void prom_init(void);
extern void pizazz_init(void);

/* platform-specific initialization vector */
static void     unimpl_cons_init(void);
static void     unimpl_iointr(uint32_t, vaddr_t, uint32_t);
static int      unimpl_memsize(void *);
static void     unimpl_intr_establish(int, int (*)(void *), void *);

struct platform platform = {
        .iobus = "iobus not set",
        .cons_init = unimpl_cons_init,
        .iointr = unimpl_iointr,
        .memsize = unimpl_memsize,
        .intr_establish = unimpl_intr_establish,
        .clkinit = NULL,
};

extern struct consdev consdev_prom;
extern struct consdev consdev_zs;

static void null_cnprobe(struct consdev *);
static void prom_cninit(struct consdev *);
static int  prom_cngetc(dev_t);
static void prom_cnputc(dev_t, int);
static void null_cnpollc(dev_t, int);

struct consdev consdev_prom = {
        null_cnprobe,
        prom_cninit,
        prom_cngetc,
        prom_cnputc,
        null_cnpollc,
};


/*
 * Do all the stuff that locore normally does before calling main().
 * Process arguments passed to us by the prom monitor.
 * Return the first page address following the system.
 */
void
mach_init(int argc, char *argv[], char *envp[], u_int bim, char *bip)
{
        u_long first, last;
        char *kernend;
        char *cp;
        int i, howto;
        extern char edata[], end[];
        const char *bi_msg;
#if NKSYMS || defined(DDB) || defined(MODULAR)
        char *ssym = 0;
        char *esym = 0;
        struct btinfo_symtab *bi_syms;
#endif

        /* Check for valid bootinfo passed from bootstrap */
        if (bim == BOOTINFO_MAGIC) {
                struct btinfo_magic *bi_magic;

                bootinfo = (char *)BOOTINFO_ADDR; /* XXX */
                bi_magic = lookup_bootinfo(BTINFO_MAGIC);
                if (bi_magic == NULL || bi_magic->magic != BOOTINFO_MAGIC)
                        bi_msg = "invalid bootinfo structure.\n";
                else
                        bi_msg = NULL;
        } else
                bi_msg = "invalid bootinfo (standalone boot?)\n";

        /* clear the BSS segment */
        kernend = (void *)mips_round_page(end);
        memset(edata, 0, end - edata);

        /*
         * Copy exception-dispatch code down to exception vector.
         * Initialize locore-function vector.
         * Clear out the I and D caches.
         */
        mips_vector_init(NULL, false);

#if NKSYMS || defined(DDB) || defined(LKM)
        bi_syms = lookup_bootinfo(BTINFO_SYMTAB);

        /* Load symbol table if present */
        if (bi_syms != NULL) {
                ssym = (void *)bi_syms->ssym;
                esym = (void *)bi_syms->esym;
                kernend = (void *)mips_round_page(esym);
        }
#endif

        prom_init();
        consinit();

        if (bi_msg != NULL)
                printf(bi_msg);

        uvm_md_init();

        /* Find out how much memory is available. */
        physmem = memsize_scan(kernend);

        /*
         * Now that we know how much memory we have, initialize the
         * mem cluster array.
         */
        mem_clusters[0].start = 0;              /* XXX is this correct? */
        mem_clusters[0].size  = ctob(physmem);
        mem_cluster_cnt = 1;

        /* Look at argv[0] and compute bootdev */
        makebootdev(argv[0]);

        /*
         * Look at arguments passed to us and compute boothowto.
         */
        boothowto = RB_AUTOBOOT;
        for (i = 1; i < argc; i++) {
                for (cp = argv[i]; *cp; cp++) {
                        /* Ignore superfluous '-', if there is one */
                        if (*cp == '-')
                                continue;

                        howto = 0;
                        BOOT_FLAG(*cp, howto);
                        if (! howto)
                                printf("bootflag '%c' not recognised\n", *cp);
                        else
                                boothowto |= howto;
                }
        }


#if NKSYMS || defined(DDB) || defined(MODULAR)
        /* init symbols if present */
        if (esym)
                ksyms_addsyms_elf(esym - ssym, ssym, esym);
#endif
#ifdef DDB
        if (boothowto & RB_KDB)
                Debugger();
#endif
#ifdef KGDB
        zs_kgdb_init();                 /* XXX */
        if (boothowto & RB_KDB)
                kgdb_connect(0);
#endif

        /*
         * Check to see if a mini-root was loaded into memory. It resides
         * at the start of the next page just after the end of BSS.
         */
        if (boothowto & RB_MINIROOT)
                kernend += round_page(mfs_initminiroot(kernend));

        /*
         * Load the rest of the available pages into the VM system.
         */
        first = round_page(MIPS_KSEG0_TO_PHYS(kernend));
        last = mem_clusters[0].start + mem_clusters[0].size;
        uvm_page_physload(atop(first), atop(last), atop(first), atop(last),
            VM_FREELIST_DEFAULT);

        /*
         * Initialize error message buffer (at end of core).
         */
        mips_init_msgbuf();

        /*
         * Initialize the virtual memory system.
         */
        pmap_bootstrap();

        /*
         * Allocate uarea page for lwp0 and set it.
         */
        mips_init_lwp0_uarea();

        /*
         * Set up interrupt handling and I/O addresses.
         */
        pizazz_init();
}



/*
 * cpu_startup: allocate memory for variable-sized tables,
 * initialize CPU, and do autoconfiguration.
 */
void
cpu_startup(void)
{
        cpu_startup_common();
}

/*
 * Look up information in bootinfo of boot loader.
 */
void *
lookup_bootinfo(int type)
{
        struct btinfo_common *bt;
        char *help = bootinfo;

        /* Check for a bootinfo record first. */
        if (help == NULL)
                return (NULL);

        do {
                bt = (struct btinfo_common *)help;
                if (bt->type == type)
                        return ((void *)help);
                help += bt->next;
        } while (bt->next != 0 &&
                (size_t)help < (size_t)bootinfo + BOOTINFO_SIZE);

        return (NULL);
}

int     waittime = -1;

/*
 * call PROM to halt or reboot.
 */
void
prom_halt(int howto)
{
        if (howto & RB_HALT)
                MIPS_PROM(reinit)();
        MIPS_PROM(reboot)();
        /* NOTREACHED */
}

void
cpu_reboot(volatile int howto, char *bootstr)
{
        /* take a snap shot before clobbering any registers */
        savectx(curpcb);

#ifdef DEBUG
        if (panicstr)
                stacktrace();
#endif

        /* If system is cold, just halt. */
        if (cold) {
                howto |= RB_HALT;
                goto haltsys;
        }

        /* If "always halt" was specified as a boot flag, obey. */
        if ((boothowto & RB_HALT) != 0)
                howto |= RB_HALT;

        boothowto = howto;
        if ((howto & RB_NOSYNC) == 0 && waittime < 0) {
                /*
                 * Synchronize the disks....
                 */
                waittime = 0;
                vfs_shutdown();
        }

        /* Disable interrupts. */
        splhigh();

        /* If rebooting and a dump is requested do it. */
#if 0
        if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP)
#else
        if (howto & RB_DUMP)
#endif
                dumpsys();

haltsys:

        /* run any shutdown hooks */
        doshutdownhooks();

        pmf_system_shutdown(boothowto);

        if ((howto & RB_POWERDOWN) == RB_POWERDOWN)
                prom_halt(0x80);        /* rom monitor RB_PWOFF */

        /* Finally, halt/reboot the system. */
        printf("%s\n\n", howto & RB_HALT ? "halted." : "rebooting...");
        prom_halt(howto & RB_HALT);
        /*NOTREACHED*/
}

int
initcpu(void)
{
        spl0();         /* safe to turn interrupts on now */
        return 0;
}

static void
unimpl_cons_init(void)
{

        panic("sysconf.init didn't set cons_init");
}

static void
unimpl_iointr(uint32_t status, vaddr_t pc, uint32_t ipending)
{

        panic("sysconf.init didn't set intr");
}

static int
unimpl_memsize(void *first)
{

        panic("sysconf.init didn't set memsize");
}

void
unimpl_intr_establish(int level, int (*func)(void *), void *arg)
{
        panic("sysconf.init didn't init intr_establish");
}

void
delay(int n)
{
        DELAY(n);
}

/*
 * Find out how much memory is available by testing memory.
 * Be careful to save and restore the original contents for msgbuf.
 */
int
memsize_scan(void *first)
{
        volatile int *vp, *vp0;
        int mem, tmp, tmp0;

#define PATTERN1 0xa5a5a5a5
#define PATTERN2 ~PATTERN1

        /*
         * Non destructive scan of memory to determine the size
         * Use the first page to test for memory aliases.  This
         * also has the side effect of flushing the bus alignment
         * buffer
         */
        mem = btoc((paddr_t)first - MIPS_KSEG0_START);
        vp = (int *)MIPS_PHYS_TO_KSEG1(mem << PGSHIFT);
        vp0 = (int *)MIPS_PHYS_TO_KSEG1(0); /* Start of physical memory */
        tmp0 = *vp0;
        while (vp < (int *)MIPS_MAX_MEM_ADDR) {
                tmp = *vp;
                *vp  = PATTERN1;
                *vp0 = PATTERN2;
                wbflush();
                if (*vp != PATTERN1)
                        break;
                *vp  = PATTERN2;
                *vp0 = PATTERN1;
                wbflush();
                if (*vp != PATTERN2)
                        break;
                *vp = tmp;
                vp += PAGE_SIZE/sizeof(int);
                mem++;
        }
        *vp0 = tmp0;
        return mem;
}

/*
 * Console initialization: called early on from main,
 * before vm init or startup.  Do enough configuration
 * to choose and initialize a console.
 */

static void
null_cnprobe(struct consdev *cn)
{
}

static void
prom_cninit(struct consdev *cn)
{
        extern const struct cdevsw cons_cdevsw;

        cn->cn_dev = makedev(cdevsw_lookup_major(&cons_cdevsw), 0);
        cn->cn_pri = CN_REMOTE;
}

static int
prom_cngetc(dev_t dev)
{
        return MIPS_PROM(getchar)();
}

static void
prom_cnputc(dev_t dev, int c)
{
        MIPS_PROM(putchar)(c);
}

static void
null_cnpollc(dev_t dev, int on)
{
}

void
consinit(void)
{

        cn_tab = &consdev_zs;

        (*cn_tab->cn_init)(cn_tab);
}