/*      $NetBSD: machdep.c,v 1.21 2025/11/30 01:46:00 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
 *      from: Utah Hdr: machdep.c 1.63 91/04/24
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.21 2025/11/30 01:46:00 thorpej Exp $");

#include "opt_ddb.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/buf.h>
#include <sys/mbuf.h>
#include <sys/reboot.h>
#include <sys/mount.h>
#include <sys/kcore.h>
#include <sys/boot_flag.h>
#include <sys/ksyms.h>
#include <sys/proc.h>
#include <sys/device.h>
#include <sys/cpu.h>
#include <sys/vmem.h>
#include <sys/vmem_impl.h>

#include <uvm/uvm_extern.h>

#include <dev/cons.h>

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

#include <mips/cache.h>
#include <machine/psl.h>
#include <machine/autoconf.h>
#include <emips/stand/common/prom_iface.h>
#include <machine/sysconf.h>
#include <machine/bootinfo.h>
#include <machine/locore.h>
#include <emips/emips/machdep.h>
#include <machine/emipsreg.h>

#define _EMIPS_BUS_DMA_PRIVATE
#include <machine/bus.h>

#if NKSYMS || defined(DDB) || defined(MODULAR)
#include <machine/db_machdep.h>
#include <ddb/db_extern.h>
#endif

vaddr_t iospace;
vsize_t iospace_size = 64 * 1024; /* BUGBUG make it an option? */

#include "ksyms.h"

/*
 * Vmem arena to manage I/O register space.  We allocate storage for
 * 32 regions in the map.
 */
#define IOMAP_BTAG_COUNT        VMEM_EST_BTCOUNT(1, 32)
static struct vmem iomap_arena_store;
static struct vmem_btag iomap_btag_store[IOMAP_BTAG_COUNT];
static vmem_t *iomap_arena;

/* maps for VM objects */
struct vm_map *phys_map = NULL;

int             systype;                    /* mother board type */
char   *bootinfo = NULL;        /* pointer to bootinfo structure */
int             cpuspeed = 30;          /* approx # instr per usec. */
intptr_t        physmem_boardmax;       /* {model,SIMM}-specific bound on physmem */
int             mem_cluster_cnt;
phys_ram_seg_t  mem_clusters[VM_PHYSSEG_MAX];

void    mach_init (int, char *[], int, intptr_t, u_int, char *); /* XXX */

/* Motherboard or system-specific initialization vector */
static void     unimpl_bus_reset(void);
static void     unimpl_cons_init(void);
static void     unimpl_iointr(uint32_t, vaddr_t, uint32_t);
static void     unimpl_intr_establish(device_t, void *, int,
                    int (*)(void *, void *), void *);
static int      unimpl_memsize(void *);

struct platform platform = {
        "iobus not set",
        unimpl_bus_reset,
        unimpl_cons_init,
        unimpl_iointr,
        unimpl_intr_establish,
        unimpl_memsize
};

extern char *esym;                      /* XXX */
extern struct consdev promcd;           /* XXX */
extern const struct callback *callv;
extern const struct callback callvec;

/*
 * Do all the stuff that locore normally does before calling main().
 * The first 4 arguments are passed by PROM monitor, and remaining two
 * are built on temporary stack by our boot loader.
 */
void
mach_init(int argc, char *argv[], int code, intptr_t cv, u_int bim, char *bip)
{
        char *cp;
        const char *bootinfo_msg;
        u_long first, last;
        int i, howtoboot;
#if NKSYMS || defined(DDB) || defined(MODULAR)
        void *ssym = 0;
        struct btinfo_symtab *bi_syms;
#endif
        void *kernend;
        extern char edata[], end[];     /* XXX */

        /* Set up bootinfo structure looking at stack. */
        if (bim == BOOTINFO_MAGIC) {
                struct btinfo_magic *bi_magic;

                bootinfo = bip;
                bi_magic = lookup_bootinfo(BTINFO_MAGIC);
                if (bi_magic == NULL || bi_magic->magic != BOOTINFO_MAGIC)
                        bootinfo_msg =
                            "invalid magic number in bootinfo structure.\n";
                else
                        bootinfo_msg = NULL;
        } else
                bootinfo_msg = "invalid bootinfo pointer (old bootblocks?)\n";

        /*
         * Look at arguments passed to us and compute boothowto.
         * Do it before we decide to keep symbols.
         * NB: "boothowto" is in the BSS.
         */
        howtoboot = 0;
#ifdef KADB
        howtoboot |= RB_KDB;
#endif
        for (i = 1; i < argc; i++) {
                for (cp = argv[i]; *cp; cp++) {
                        switch (*cp) {

#define RB_NOSYMBOLS 0x10000000
                        case 'e': /* empty the symtable */
                                howtoboot |= RB_NOSYMBOLS;
                                break;

                        case 'n': /* ask for names */
                                howtoboot |= RB_ASKNAME;
                                break;

                        case 'N': /* don't ask for names */
                                howtoboot &= ~RB_ASKNAME;
                                break;

                        default:
                                BOOT_FLAG(*cp, howtoboot); /* see sys/boot_flag.h */
                                break;
                        }
                }
        }

        /* clear the BSS segment */
#if NKSYMS || defined(DDB) || defined(MODULAR)
        bi_syms = lookup_bootinfo(BTINFO_SYMTAB);

        /* Was it a valid bootinfo symtab info? */
        if ((bi_syms != NULL) && (!(howtoboot & RB_NOSYMBOLS))) {
                ssym = (void *)(intptr_t)bi_syms->ssym;
                esym = (void *)(intptr_t)bi_syms->esym;
                kernend = (void *)mips_round_page(esym);
                memset(edata, 0, end - edata);
        } else
#endif
        {
                kernend = (char *)mips_round_page(end);
                /* should be done by bootloader? */
                memset(edata, 0, (char *)kernend - (char *)edata);
        }

        /* Initialize callv so we can do PROM output... */
        callv = (code == PROM_MAGIC) ? (void *)cv : &callvec;

        /* Use PROM console output until we initialize a console driver. */
        cn_tab = &promcd;

#if 1
        if (bootinfo_msg != NULL)
                printf(bootinfo_msg);
#endif
        uvm_md_init();

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

        /*
         * We know the CPU type now.  Initialize our DMA tags (might
         * need this early, for certain types of console devices!!).
         */
        emips_bus_dma_init();

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

        boothowto = howtoboot & ~RB_NOSYMBOLS;

        /*
         * 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 = (char *)kernend
                    + round_page(mfs_initminiroot(kernend));

#if NKSYMS || defined(DDB) || defined(MODULAR)
        /* init symbols if present */
        if (esym) {
                ksyms_addsyms_elf((char *)esym - (char *)ssym, ssym, esym);
        }
#endif
#ifdef DDB
        if (boothowto & RB_KDB)
                Debugger();
#endif

        /*
         * Initialize physmem_boardmax; assume no SIMM-bank limits.
         * Adjust later in model-specific code if necessary.
         */
        physmem_boardmax = MIPS_MAX_MEM_ADDR;

        /*
         * Determine what model of computer we are running on.
         */
        systype = ((prom_systype() >> 16) & 0xff);
        if (systype >= nsysinit) {
                platform_not_supported();
                /* NOTREACHED */
        }

        /* Machine specific initialization. */
        (*sysinit[systype].init)();

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

        /*
         * Load the rest of the available pages into the VM system.
         * NB: The kernel can span multiple segments.
         */
        for (i = 0, physmem = 0; i < mem_cluster_cnt; ++i) {
                first = mem_clusters[i].start;
                if (first < round_page(MIPS_KSEG0_TO_PHYS(kernend)))
                        first = round_page(MIPS_KSEG0_TO_PHYS(kernend));
                last = mem_clusters[i].start + mem_clusters[i].size;
                physmem += atop(mem_clusters[i].size);

                /* if the kernel spans multiple segments (does on ML40x) */
                if (last <= first)
                        continue;

                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.
         */
        iospace = pmap_limits.virtual_start;
        pmap_limits.virtual_start += iospace_size;
        pmap_bootstrap();

        mips_init_lwp0_uarea();
}

void
mips_machdep_cache_config(void)
{
}

void
consinit(void)
{
        /*
         * Init I/O memory vmem arena. Must be done before cninit()
         * is called; we may want to use iospace in the console routines.
         */
        KASSERT(iospace != 0);
        iomap_arena = vmem_init(&iomap_arena_store,
                                "iomap",                /* name */
                                0,                      /* addr */
                                0,                      /* size */
                                PAGE_SIZE,              /* quantum */
                                NULL,                   /* importfn */
                                NULL,                   /* releasefn */
                                NULL,                   /* source */
                                0,                      /* qcache_max */
                                VM_NOSLEEP | VM_PRIVTAGS,
                                IPL_NONE);
        KASSERT(iomap_arena != NULL);

        vmem_add_bts(iomap_arena, iomap_btag_store, IOMAP_BTAG_COUNT);
        int error = vmem_add(iomap_arena, iospace, iospace_size,
            VM_NOSLEEP);
        KASSERT(error == 0);

        /*
         * Up until now we have kept the TLB disabled,
         * and that allowed the "PROM" to work.
         * Specifically, romputc() and the debugger's getc() functions worked.
         * Now is the last chance we get to turn it on.
         * That means no more console I/O until autoconf() [sigh!], or..
         * The platform-specific code will have to map [1:1 probably]
         * the I/O registers.
         */
        register_t s = mips_cp0_status_read();
        s &= ~MIPS_SR_TS;
        mips_cp0_status_write(s);

        (*platform.cons_init)();

        /*
         * Do NOT call cninit(); It will clobber cn_tab using constab[]
         * which we do not use
         */
}

/*
 * Allocates a virtual range suitable for mapping in physical memory.
 * Uses a vmem arena when allocating space, which is allocated from 
 * the IOMAP submap. SIZE is a linear range (NOT vax-pages like the VAX).
 * If the page requested is bigger than a logical page, space is
 * allocated from the kernel map instead.
 */
vaddr_t
mips_map_physmem(paddr_t phys, vsize_t size)
{
        vmem_addr_t addr;
        int error;
        static int warned = 0;

        size += phys & PAGE_MASK;
        if (size > PAGE_SIZE) {
                addr = uvm_km_alloc(kernel_map, size, 0, UVM_KMF_VAONLY);
                if (addr == 0)
                        panic("mips_map_physmem: kernel map full");
        } else {
                error = vmem_alloc(iomap_arena, mips_round_page(size),
                    VM_BESTFIT | VM_NOSLEEP, &addr);
                if (error) {
                        if (warned++ == 0) /* Warn only once */
                                printf("mips_map_physmem: iomap too small");
                        return 0;
                }
        }
        ioaccess(addr, phys, size);
#ifdef PHYSMEMDEBUG
        printf("mips_map_physmem: alloc'ed %x bytes for paddr %x, at %x\n",
            size, phys, addr);
#endif
        return addr | (phys & PAGE_MASK);
}

/*
 * Unmaps the previous mapped (addr, size) pair.
 */
void
mips_unmap_physmem(vaddr_t addr, vsize_t size)
{
#ifdef PHYSMEMDEBUG
        printf("mips_unmap_physmem: unmapping %x bytes at addr %x\n", 
            size, addr);
#endif
        size += addr & PAGE_MASK;
        addr &= ~PAGE_MASK;

        iounaccess(addr, size);
        if (size > PAGE_SIZE)
                uvm_km_free(kernel_map, addr, size, UVM_KMF_VAONLY);
        else
                vmem_free(iomap_arena, addr, mips_round_page(size));
}

/*
 * Machine-dependent startup code: allocate memory for variable-sized
 * tables.
 */
void
cpu_startup(void)
{
        vaddr_t minaddr, maxaddr;
        char pbuf[9];
#ifdef DEBUG
        extern int pmapdebug;           /* XXX */
        int opmapdebug = pmapdebug;

        pmapdebug = 0;
#endif

        /*
         * Good {morning,afternoon,evening,night}.
         */
        printf("%s%s", copyright, version);
        printf("%s\n", cpu_getmodel());
        format_bytes(pbuf, sizeof(pbuf), ctob(physmem));
        printf("total memory = %s\n", pbuf);

        minaddr = 0;

        /*
         * Allocate a submap for physio
         */
        phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
                                   VM_PHYS_SIZE, 0, false, NULL);

        /*
         * No need to allocate an mbuf cluster submap.  Mbuf clusters
         * are allocated via the pool allocator, and we use KSEG to
         * map those pages.
         */

#ifdef DEBUG
        pmapdebug = opmapdebug;
#endif
        format_bytes(pbuf, sizeof(pbuf), ptoa(uvm_availmem(false)));
        printf("avail memory = %s\n", pbuf);
}

/*
 * 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);
}

void
cpu_reboot(volatile int howto,  /* XXX volatile to keep gcc happy */
           char *bootstr)
{

        /* take a snap shot before clobbering any registers */
        if (curlwp)
                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) {
                /*
                 * Synchronize the disks....
                 */
                vfs_shutdown();
        }

        /* Disable interrupts. */
        splhigh();

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

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

        pmf_system_shutdown(boothowto);

        /* Finally, halt/reboot the system. */
        printf("%s\n\n", ((howto & RB_HALT) != 0) ? "halted." : "rebooting...");

        prom_halt(howto);
        for (;;) ;
        /*NOTREACHED*/
}

#if defined(MIPS_4GB_PHYSICAL_MEMORY)
#define trim_memory(n) n
#else
#if 0
#define TOO_MUCH (MIPS_PHYS_MASK+1)
#else
#define TOO_MUCH (2*64*1024*1024)
#endif
u_long trim_memory(uint32_t nbytes);/*cheat*/
u_long trim_memory(uint32_t nbytes)
{
        int i;
        u_long first, last;

        nbytes *= 4096;
        if (nbytes <= TOO_MUCH)
                return nbytes;

        /* We have more memory than we can handle */

        mem_clusters[mem_cluster_cnt].start = 0;/* sentinel record */
        mem_clusters[mem_cluster_cnt].size = 0;
        for (i = 0; i < mem_cluster_cnt;) {
                first = mem_clusters[i].start;
                last = mem_clusters[i].start + mem_clusters[i].size;

                if (first > TOO_MUCH) {
                        printf("Too much memory, ignoring memory "
                            "range %08lx..%08lx\n", first, last);
                        memcpy(mem_clusters+i,mem_clusters+i+1,
                            (sizeof(mem_clusters[0])*(mem_cluster_cnt-i)));
                        mem_cluster_cnt--;
                        continue;
                }

                if (last > TOO_MUCH) {
                        last = TOO_MUCH;
                        printf("Too much memory in cluster %d, trimming "
                           "memory to range %08lx..%08lx\n", 
                           i, first, last);
                        mem_clusters[i].size = last - mem_clusters[i].start;
                }
                i++;
        }
        return TOO_MUCH;
}
#endif

/*
 * Find out how much memory is available by testing memory.
 */
int
memsize_scan(void *first)
{
        int i, mem;
        char *cp;

        mem = btoc((paddr_t)first - MIPS_KSEG0_START);
        cp = (char *)MIPS_PHYS_TO_KSEG1(mem << PGSHIFT);
        while (cp < (char *)physmem_boardmax) {
                int j;
                if (badaddr(cp, 4))
                        break;
                i = *(int *)cp;
                j = ((int *)cp)[4];
                *(int *)cp = 0xa5a5a5a5;
                /*
                 * Data will persist on the bus if we read it right away.
                 * Have to be tricky here.
                 */
                ((int *)cp)[4] = 0x5a5a5a5a;
                wbflush();
                if (*(int *)cp != 0xa5a5a5a5)
                        break;
                *(int *)cp = i;
                ((int *)cp)[4] = j;
                cp += PAGE_SIZE;
                mem++;
        }

        /*
         * 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(mem);
        mem_cluster_cnt = 1;

        /* clear any memory error conditions possibly caused by probe */
        (*platform.bus_reset)();
        return (mem);
}

/*
 * Find out how much memory is available by testing memory, starting at first.
 * Returns the total number of pages.
 */
int
memsize_pmt(void * first)
{
        int i, mem;
        struct _Pmt *Pmt = ThePmt;
        struct _Sram *ram;
        uint32_t addr, len;

        /*
         * Build the RAM memory map from the PMT.
         */
        mem = 0;
        for (i = 0; i < VM_PHYSSEG_MAX; Pmt--) {
                uint16_t tag = Pmt->Tag;

                if (tag == PMTTAG_END_OF_TABLE)
                        break;

                if ((tag != PMTTAG_SRAM) && (tag != PMTTAG_DDRAM))
                        continue;

                /*
                 * Got a memory controller segment,
                 * scan all the controllers in it
                 */
                ram = (struct _Sram *)(Pmt->TopOfPhysicalAddress << 16);

                for (;(ram->BaseAddressAndTag & SRAMBT_TAG) == tag;) {
                        addr = ram->BaseAddressAndTag & SRAMBT_BASE;
                        len  = ram->Control & SRAMST_SIZE;

                        mem_clusters[i].start = addr;
                        mem_clusters[i].size  = len;
                        printf("memory segment %2d start %08lx size %08lx\n", i,
                            (long)mem_clusters[i].start,
                            (long)mem_clusters[i].size);
                        i++;
                        mem += len;

                        /* SRAM and DDRAM have different sizes */
                        ram = (tag == PMTTAG_SRAM) ? ram+1 : ram+2;
                }
        }
        mem_cluster_cnt = i;

        return trim_memory(btoc(mem));
}
/*
 *  Ensure all platform vectors are always initialized.
 */
static void
unimpl_bus_reset(void)
{

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

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 void
unimpl_intr_establish(device_t dev, void *cookie, int level,
                      int (*handler) (void *,void *), void *arg)
{

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

static int
unimpl_memsize(void * first)
{

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

/*
 * Wait "n" microseconds.
 */
void
delay(int n)
{

        DELAY(n);
}