/* $NetBSD: machdep.c,v 1.59 2025/12/20 10:51:05 skrll Exp $ */

/*
 * Copyright 2000, 2001
 * Broadcom Corporation. All rights reserved.
 *
 * This software is furnished under license and may be used and copied only
 * in accordance with the following terms and conditions.  Subject to these
 * conditions, you may download, copy, install, use, modify and distribute
 * modified or unmodified copies of this software in source and/or binary
 * form. No title or ownership is transferred hereby.
 *
 * 1) Any source code used, modified or distributed must reproduce and
 *    retain this copyright notice and list of conditions as they appear in
 *    the source file.
 *
 * 2) No right is granted to use any trade name, trademark, or logo of
 *    Broadcom Corporation.  The "Broadcom Corporation" name may not be
 *    used to endorse or promote products derived from this software
 *    without the prior written permission of Broadcom Corporation.
 *
 * 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR IMPLIED
 *    WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF
 *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
 *    NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM BE LIABLE
 *    FOR ANY DAMAGES WHATSOEVER, AND IN PARTICULAR, BROADCOM SHALL NOT BE
 *    LIABLE FOR 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), EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Copyright (c) 2000 Soren S. Jorvang.  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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.59 2025/12/20 10:51:05 skrll Exp $");

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

#include <sys/param.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/cpu.h>
#include <sys/device.h>
#include <sys/exec.h>
#include <sys/file.h>
#include <sys/intr.h>
#include <sys/kcore.h>
#include <sys/kernel.h>
#include <sys/ksyms.h>
#include <sys/mbuf.h>
#include <sys/mount.h>
#include <sys/msgbuf.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/syscallargs.h>
#include <sys/systm.h>

#include <uvm/uvm_extern.h>

#include <mips/locore.h>
#include <mips/psl.h>
#include <mips/pte.h>
#include <mips/reg.h>

#include <mips/cfe/cfe_api.h>

#include <sbmips/autoconf.h>
#include <sbmips/swarm.h>

#if 0 /* XXXCGD */
#include <sbmips/nvram.h>
#endif /* XXXCGD */
#include <sbmips/leds.h>

#include <mips/sibyte/dev/sbbuswatchvar.h>

#include "ksyms.h"

#if NKSYMS || defined(DDB) || defined(MODULAR)
#include <mips/db_machdep.h>
#include <ddb/db_access.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>
#include <sys/exec_elf.h>
#endif

#include <dev/cons.h>

#if NKSYMS || defined(DDB) || defined(MODULAR)
/* start and end of kernel symbol table */
void    *ksym_start, *ksym_end;
#endif

/* Maps for VM objects. */
struct vm_map *phys_map = NULL;

char    bootstring[512];        /* Boot command */
int     netboot;                /* Are we netbooting? */
int     cfe_present;

struct bootinfo_v1 bootinfo;

phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];
int mem_cluster_cnt;

void    configure(void);
void    mach_init(long, long, long, long);

extern void *esym;

/*
 * Do all the stuff that locore normally does before calling main().
 */
void
mach_init(long fwhandle, long magic, long bootdata, long reserved)
{
        void *kernend;
        extern char edata[], end[];
        uint32_t config;

        /* XXX this code must run on the target CPU */
        config = mips3_cp0_config_read();
        config &= ~MIPS3_CONFIG_K0_MASK;
        config |= 0x05;                         /* XXX.  cacheable coherent */
        mips3_cp0_config_write(config);

        /* Zero BSS.  XXXCGD: uh, is this really necessary still?  */
        memset(edata, 0, end - edata);

        /*
         * Copy the bootinfo structure from the boot loader.
         * this has to be done before mips_vector_init is
         * called because we may need CFE's TLB handler
         */

        if (magic == BOOTINFO_MAGIC)
                memcpy(&bootinfo, (struct bootinfo_v1 *)bootdata,
                    sizeof bootinfo);
        else if (reserved == CFE_EPTSEAL) {
                magic = BOOTINFO_MAGIC;
                memset(&bootinfo, 0, sizeof bootinfo);
                bootinfo.version = BOOTINFO_VERSION;
                bootinfo.fwhandle = fwhandle;
                bootinfo.fwentry = bootdata;
                bootinfo.ssym = (vaddr_t)end;
                bootinfo.esym = (vaddr_t)end;
        }

        kernend = (void *)mips_round_page(end);
#if NKSYMS || defined(DDB) || defined(MODULAR)
        if (magic == BOOTINFO_MAGIC) {
                ksym_start = (void *)(intptr_t)bootinfo.ssym;
                ksym_end   = (void *)(intptr_t)bootinfo.esym;
                kernend = (void *)mips_round_page((vaddr_t)ksym_end);
        }
#endif

        consinit();

        uvm_md_init();

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

        mips_locoresw.lsw_bus_error = sibyte_bus_watch_check;

        sb1250_ipl_map_init();

#ifdef DEBUG
        printf("fwhandle=%08X magic=%08X bootdata=%08X reserved=%08X\n",
            (u_int)fwhandle, (u_int)magic, (u_int)bootdata, (u_int)reserved);
#endif

        cpu_setmodel("sb1250");

        if (magic == BOOTINFO_MAGIC) {
                int idx;
                int added;
                uint64_t start, len, type;

                cfe_init(bootinfo.fwhandle, bootinfo.fwentry);
                cfe_present = 1;

                idx = 0;
                physmem = 0;
                mem_cluster_cnt = 0;
                while (cfe_enummem(idx, 0, &start, &len, &type) == 0) {
                        added = 0;
                        printf("Memory Block #%d start %08"PRIx64"X len %08"PRIx64"X: %s: ",
                            idx, start, len, (type == CFE_MI_AVAILABLE) ?
                            "Available" : "Reserved");
                        if ((type == CFE_MI_AVAILABLE) &&
                            (mem_cluster_cnt < VM_PHYSSEG_MAX)) {
                                /*
                                 * XXX Ignore memory above 256MB for now, it
                                 * XXX needs special handling.
                                 */
                                if (start < (256*1024*1024)) {
                                    physmem += btoc(((int) len));
                                    mem_clusters[mem_cluster_cnt].start =
                                        (long) start;
                                    mem_clusters[mem_cluster_cnt].size =
                                        (long) len;
                                    mem_cluster_cnt++;
                                    added = 1;
                                }
                        }
                        if (added)
                                printf("added to map\n");
                        else
                                printf("not added to map\n");
                        idx++;
                }

        } else {
                /*
                 * Handle the case of not being called from the firmware.
                 */
                /* XXX hardwire to 32MB; should be kernel config option */
                physmem = 32 * 1024 * 1024 / 4096;
                mem_clusters[0].start = 0;
                mem_clusters[0].size = ctob(physmem);
                mem_cluster_cnt = 1;
        }


        for (u_int i = 0; i < sizeof(bootinfo.boot_flags); i++) {
                switch (bootinfo.boot_flags[i]) {
                case '\0':
                        break;
                case ' ':
                        continue;
                case '-':
                        while (bootinfo.boot_flags[i] != ' ' &&
                            bootinfo.boot_flags[i] != '\0') {
                                switch (bootinfo.boot_flags[i]) {
                                case 'a':
                                        boothowto |= RB_ASKNAME;
                                        break;
                                case 'd':
                                        boothowto |= RB_KDB;
                                        break;
                                case 's':
                                        boothowto |= RB_SINGLE;
                                        break;
                                }
                                i++;
                        }
                }
        }

        /*
         * Load the rest of the available pages into the VM system.
         */
        mips_page_physload(MIPS_KSEG0_START, (vaddr_t) kernend,
            mem_clusters, mem_cluster_cnt, NULL, 0);

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

        pmap_bootstrap();

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

        /*
         * Initialize debuggers, and break into them, if appropriate.
         */
#if NKSYMS || defined(DDB) || defined(MODULAR)
        ksyms_addsyms_elf(((uintptr_t)ksym_end - (uintptr_t)ksym_start),
            ksym_start, ksym_end);
#endif

        if (boothowto & RB_KDB) {
#if defined(DDB)
                Debugger();
#endif
        }

#ifdef MULTIPROCESSOR
        mips_fixup_exceptions(mips_fixup_zero_relative, NULL);
#endif
}

/*
 * Allocate memory for variable-sized tables,
 */
void
cpu_startup(void)
{
        /*
         * Just do the common stuff.
         */
        cpu_startup_common();
}

int     waittime = -1;

void
cpu_reboot(int howto, char *bootstr)
{

        /* Take a snapshot before clobbering any registers. */
        savectx(curpcb);

        if (cold) {
                howto |= RB_HALT;
                goto haltsys;
        }

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

        boothowto = howto;
        if ((howto & RB_NOSYNC) == 0 && (waittime < 0)) {
                waittime = 0;
                vfs_shutdown();
        }

        splhigh();

        if (howto & RB_DUMP)
                dumpsys();

haltsys:
        doshutdownhooks();

        pmf_system_shutdown(boothowto);

        if (howto & RB_HALT) {
                printf("\n");
                printf("The operating system has halted.\n");
                printf("Please press any key to reboot.\n\n");
                cnpollc(true);  /* For proper keyboard command handling */
                cngetc();
                cnpollc(false);
        }

        printf("rebooting...\n\n");

        if (cfe_present) {
                /*
                 * XXX
                 * For some reason we can't return to CFE with
                 * and do a warm start.  Need to look into this...
                 */
                cfe_exit(0, (howto & RB_DUMP) ? 1 : 0);
                printf("cfe_exit didn't!\n");
        }

        printf("WARNING: reboot failed!\n");

        for (;;);
}

static void
cswarm_setled(u_int index, char c)
{
        volatile u_char *led_ptr =
            (void *)MIPS_PHYS_TO_KSEG1(SWARM_LEDS_PHYS);

        if (index < 4)
                led_ptr[0x20 + ((3 - index) << 3)] = c;
}

void
cswarm_setleds(const char *str)
{
        int i;

        for (i = 0; i < 4 && str[i]; i++)
                cswarm_setled(i, str[i]);
        for (; i < 4; i++)
                cswarm_setled(' ', str[i]);
}

int
sbmips_cca_for_pa(paddr_t pa)
{
        int rv;

        rv = 2;                 /* Uncached. */

        /* Check each DRAM region. */
        if ((pa >= 0x0000000000   && pa <= 0x000fffffff) ||     /* DRAM 0 */
            (pa >= 0x0080000000   && pa <= 0x008fffffff) ||     /* DRAM 1 */
            (pa >= 0x0090000000   && pa <= 0x009fffffff) ||     /* DRAM 2 */
            (pa >= 0x00c0000000   && pa <= 0x00cfffffff) ||     /* DRAM 3 */
#ifdef _MIPS_PADDR_T_64BIT
            (pa >= 0x0100000000LL && pa <= 0x07ffffffffLL) ||   /* DRAM exp */
#endif
           0) {
                rv = 5;         /* Cacheable coherent. */
        }

        return (rv);
}