/* $OpenBSD: machdep.c,v 1.206 2025/06/29 15:55:21 miod Exp $ */
/* $NetBSD: machdep.c,v 1.210 2000/06/01 17:12:38 thorpej Exp $ */

/*-
 * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center and by Chris G. Demetriou.
 *
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*
 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Chris G. Demetriou
 * 
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signalvar.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/sched.h>
#include <sys/buf.h>
#include <sys/reboot.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/timeout.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/msgbuf.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/user.h>
#include <sys/exec.h>
#include <sys/sysctl.h>
#include <sys/core.h>
#include <sys/kcore.h>

#include <net/if.h>
#include <uvm/uvm.h>

#include <machine/kcore.h>
#ifndef NO_IEEE
#include <machine/fpu.h>
#endif
#include <sys/timetc.h>

#include <sys/mount.h>
#include <sys/syscallargs.h>

#include <dev/cons.h>

#include <machine/autoconf.h>
#include <machine/cpu.h>
#include <machine/reg.h>
#include <machine/rpb.h>
#include <machine/prom.h>
#include <machine/cpuconf.h>
#ifndef NO_IEEE
#include <machine/ieeefp.h>
#endif

#include <dev/pci/pcivar.h>

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

#include "ioasic.h"

#if NIOASIC > 0
#include <machine/tc_machdep.h>
#include <dev/tc/tcreg.h>
#include <dev/tc/ioasicvar.h>
#endif

int     cpu_dump(void);
int     cpu_dumpsize(void);
u_long  cpu_dump_mempagecnt(void);
void    dumpsys(void);
void    identifycpu(void);
void    regdump(struct trapframe *framep);
void    printregs(struct reg *);

struct uvm_constraint_range  isa_constraint = { 0x0, 0x00ffffffUL };
struct uvm_constraint_range  dma_constraint = { 0x0, (paddr_t)-1 };
struct uvm_constraint_range *uvm_md_constraints[] = {
        &isa_constraint,
        NULL
};

struct vm_map *exec_map = NULL;
struct vm_map *phys_map = NULL;

/*
 * safepri is a safe priority for sleep to set for a spin-wait
 * during autoconfiguration or after a panic.
 */
int   safepri = 0;

#ifdef APERTURE
int allowaperture = 0;
#endif

int     totalphysmem;           /* total amount of physical memory in system */
int     physmem;                /* physical mem used by OpenBSD + some rsvd */
int     resvmem;                /* amount of memory reserved for PROM */
int     unusedmem;              /* amount of memory for OS that we don't use */
int     unknownmem;             /* amount of memory with an unknown use */

int     cputype;                /* system type, from the RPB */

int     bootdev_debug = 0;      /* patchable, or from DDB */

/* the following is used externally (sysctl_hw) */
char    machine[] = MACHINE;            /* from <machine/param.h> */
char    cpu_model[128];

struct  user *proc0paddr;

/* Number of machine cycles per microsecond */
u_int64_t       cycles_per_usec;

struct bootinfo_kernel bootinfo;

struct consdev *cn_tab;

/* For built-in TCDS */
#if defined(DEC_3000_300) || defined(DEC_3000_500)
u_int8_t        dec_3000_scsiid[2], dec_3000_scsifast[2];
#endif

struct platform platform;

/* for cpu_sysctl() */
#ifndef NO_IEEE
int     alpha_fp_sync_complete = 0;     /* fp fixup if sync even without /s */
#endif
#if NIOASIC > 0
int     alpha_led_blink = 1;
#endif

/*
 * XXX This should be dynamically sized, but we have the chicken-egg problem!
 * XXX it should also be larger than it is, because not all of the mddt
 * XXX clusters end up being used for VM.
 */
phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];    /* low size bits overloaded */
int     mem_cluster_cnt;

/*
 * Arguments are PFN of current level 1 page table, and bootinfo magic, pointer
 * and version.
 */
void
alpha_init(u_long unused, u_long ptb, u_long bim, u_long bip, u_long biv)
{
        extern char kernel_text[], _end[];
        struct mddt *mddtp;
        struct mddt_cluster *memc;
        int i, mddtweird;
        struct vm_physseg *vps;
        vaddr_t kernstart, kernend;
        paddr_t kernstartpfn, kernendpfn, pfn0, pfn1;
        char *p;
        const char *bootinfo_msg;
        const struct cpuinit *c;
        extern caddr_t esym;
        struct cpu_info *ci;
        cpuid_t cpu_id;

        /* NO OUTPUT ALLOWED UNTIL FURTHER NOTICE */

        /*
         * Turn off interrupts (not mchecks) and floating point.
         * Make sure the instruction and data streams are consistent.
         */
        (void)alpha_pal_swpipl(ALPHA_PSL_IPL_HIGH);
        alpha_pal_wrfen(0);
        ALPHA_TBIA();
        alpha_pal_imb();

        /* Initialize the SCB. */
        scb_init();

        cpu_id = cpu_number();

#if defined(MULTIPROCESSOR)
        /*
         * Set our SysValue to the address of our cpu_info structure.
         * Secondary processors do this in their spinup trampoline.
         */
        alpha_pal_wrval((u_long)&cpu_info_primary);
        cpu_info[cpu_id] = &cpu_info_primary;
#endif

        ci = curcpu();
        ci->ci_cpuid = cpu_id;

        /*
         * Get critical system information (if possible, from the
         * information provided by the boot program).
         */
        bootinfo_msg = NULL;
        if (bim == BOOTINFO_MAGIC) {
                if (biv == 0) {         /* backward compat */
                        biv = *(u_long *)bip;
                        bip += 8;
                }
                switch (biv) {
                case 1: {
                        struct bootinfo_v1 *v1p = (struct bootinfo_v1 *)bip;

                        bootinfo.ssym = v1p->ssym;
                        bootinfo.esym = v1p->esym;
                        /* hwrpb may not be provided by boot block in v1 */
                        if (v1p->hwrpb != NULL) {
                                bootinfo.hwrpb_phys =
                                    ((struct rpb *)v1p->hwrpb)->rpb_phys;
                                bootinfo.hwrpb_size = v1p->hwrpbsize;
                        } else {
                                bootinfo.hwrpb_phys =
                                    ((struct rpb *)HWRPB_ADDR)->rpb_phys;
                                bootinfo.hwrpb_size =
                                    ((struct rpb *)HWRPB_ADDR)->rpb_size;
                        }
                        bcopy(v1p->boot_flags, bootinfo.boot_flags,
                            min(sizeof v1p->boot_flags,
                              sizeof bootinfo.boot_flags));
                        bcopy(v1p->booted_kernel, bootinfo.booted_kernel,
                            min(sizeof v1p->booted_kernel,
                              sizeof bootinfo.booted_kernel));
                        boothowto = v1p->howto;
                        /* booted dev not provided in bootinfo */
                        init_prom_interface((struct rpb *)
                            ALPHA_PHYS_TO_K0SEG(bootinfo.hwrpb_phys));
                        prom_getenv(PROM_E_BOOTED_DEV, bootinfo.booted_dev,
                            sizeof bootinfo.booted_dev);
                        break;
                }
                default:
                        bootinfo_msg = "unknown bootinfo version";
                        goto nobootinfo;
                }
        } else {
                bootinfo_msg = "boot program did not pass bootinfo";
nobootinfo:
                bootinfo.ssym = (u_long)_end;
                bootinfo.esym = (u_long)_end;
                bootinfo.hwrpb_phys = ((struct rpb *)HWRPB_ADDR)->rpb_phys;
                bootinfo.hwrpb_size = ((struct rpb *)HWRPB_ADDR)->rpb_size;
                init_prom_interface((struct rpb *)HWRPB_ADDR);
                prom_getenv(PROM_E_BOOTED_OSFLAGS, bootinfo.boot_flags,
                    sizeof bootinfo.boot_flags);
                prom_getenv(PROM_E_BOOTED_FILE, bootinfo.booted_kernel,
                    sizeof bootinfo.booted_kernel);
                prom_getenv(PROM_E_BOOTED_DEV, bootinfo.booted_dev,
                    sizeof bootinfo.booted_dev);
        }

        esym = (caddr_t)bootinfo.esym;
        /*
         * Initialize the kernel's mapping of the RPB.  It's needed for
         * lots of things.
         */
        hwrpb = (struct rpb *)ALPHA_PHYS_TO_K0SEG(bootinfo.hwrpb_phys);

#if defined(DEC_3000_300) || defined(DEC_3000_500)
        if (hwrpb->rpb_type == ST_DEC_3000_300 ||
            hwrpb->rpb_type == ST_DEC_3000_500) {
                prom_getenv(PROM_E_SCSIID, dec_3000_scsiid,
                    sizeof(dec_3000_scsiid));
                prom_getenv(PROM_E_SCSIFAST, dec_3000_scsifast,
                    sizeof(dec_3000_scsifast));
        }
#endif

        /*
         * Remember how many cycles there are per microsecond,
         * so that we can use delay().  Round up, for safety.
         */
        cycles_per_usec = (hwrpb->rpb_cc_freq + 999999) / 1000000;

        /*
         * Initialize the (temporary) bootstrap console interface, so
         * we can use printf until the VM system starts being setup.
         * The real console is initialized before then.
         */
        init_bootstrap_console();

        /* OUTPUT NOW ALLOWED */

        /* delayed from above */
        if (bootinfo_msg)
                printf("WARNING: %s (0x%lx, 0x%lx, 0x%lx)\n",
                    bootinfo_msg, bim, bip, biv);

        /* Initialize the trap vectors on the primary processor. */
        trap_init();

        /*
         * Find out what hardware we're on, and do basic initialization.
         */
        cputype = hwrpb->rpb_type;
        if (cputype < 0) {
                /*
                 * At least some white-box systems have SRM which
                 * reports a systype that's the negative of their
                 * blue-box counterpart.
                 */
                cputype = -cputype;
        }
        c = platform_lookup(cputype);
        if (c == NULL) {
                platform_not_supported();
                /* NOTREACHED */
        }
        (*c->init)();
        strlcpy(cpu_model, platform.model, sizeof cpu_model);

        /*
         * Initialize the real console, so that the bootstrap console is
         * no longer necessary.
         */
        (*platform.cons_init)();

#if 0
        /* Paranoid sanity checking */

        assert(hwrpb->rpb_primary_cpu_id == alpha_pal_whami());

        /*
         * On single-CPU systypes, the primary should always be CPU 0,
         * except on Alpha 8200 systems where the CPU id is related
         * to the VID, which is related to the Turbo Laser node id.
         */
        if (cputype != ST_DEC_21000)
                assert(hwrpb->rpb_primary_cpu_id == 0);
#endif

        /* NO MORE FIRMWARE ACCESS ALLOWED */

#ifndef SMALL_KERNEL
        /*
         * If we run on a BWX-capable processor, override cpu_switch
         * with a faster version.
         * We do this now because the kernel text might be mapped
         * read-only eventually (although this is not the case at the moment).
         */
        if (alpha_implver() >= ALPHA_IMPLVER_EV5) {
                if ((~alpha_amask(ALPHA_AMASK_BWX) & ALPHA_AMASK_BWX) != 0) {
                        extern vaddr_t __bwx_switch0, __bwx_switch1,
                            __bwx_switch2, __bwx_switch3;
                        u_int32_t *dst, *src, *end;

                        src = (u_int32_t *)&__bwx_switch2;
                        end = (u_int32_t *)&__bwx_switch3;
                        dst = (u_int32_t *)&__bwx_switch0;
                        while (src != end)
                                *dst++ = *src++;
                        src = (u_int32_t *)&__bwx_switch1;
                        end = (u_int32_t *)&__bwx_switch2;
                        while (src != end)
                                *dst++ = *src++;
                }
        }
#endif

        /*
         * find out this system's page size
         */
        if ((uvmexp.pagesize = hwrpb->rpb_page_size) != 8192)
                panic("page size %d != 8192?!", uvmexp.pagesize);

        uvm_setpagesize();

        /*
         * Find the beginning and end of the kernel (and leave a
         * bit of space before the beginning for the bootstrap
         * stack).
         */
        kernstart = trunc_page((vaddr_t)kernel_text) - 2 * PAGE_SIZE;
        kernend = (vaddr_t)round_page((vaddr_t)bootinfo.esym);

        kernstartpfn = atop(ALPHA_K0SEG_TO_PHYS(kernstart));
        kernendpfn = atop(ALPHA_K0SEG_TO_PHYS(kernend));

        /*
         * Find out how much memory is available, by looking at
         * the memory cluster descriptors.  This also tries to do
         * its best to detect things that have never been seen
         * before...
         */
        mddtp = (struct mddt *)(((caddr_t)hwrpb) + hwrpb->rpb_memdat_off);

        /* MDDT SANITY CHECKING */
        mddtweird = 0;
        if (mddtp->mddt_cluster_cnt < 2) {
                mddtweird = 1;
                printf("WARNING: weird number of mem clusters: %lu\n",
                    (unsigned long)mddtp->mddt_cluster_cnt);
        }

#if 0
        printf("Memory cluster count: %d\n", mddtp->mddt_cluster_cnt);
#endif

        for (i = 0; i < mddtp->mddt_cluster_cnt; i++) {
                memc = &mddtp->mddt_clusters[i];
#if 0
                printf("MEMC %d: pfn 0x%lx cnt 0x%lx usage 0x%lx\n", i,
                    memc->mddt_pfn, memc->mddt_pg_cnt, memc->mddt_usage);
#endif
                totalphysmem += memc->mddt_pg_cnt;
                if (mem_cluster_cnt < VM_PHYSSEG_MAX) { /* XXX */
                        mem_clusters[mem_cluster_cnt].start =
                            ptoa(memc->mddt_pfn);
                        mem_clusters[mem_cluster_cnt].size =
                            ptoa(memc->mddt_pg_cnt);
                        if (memc->mddt_usage & MDDT_mbz ||
                            memc->mddt_usage & MDDT_NONVOLATILE || /* XXX */
                            memc->mddt_usage & MDDT_PALCODE)
                                mem_clusters[mem_cluster_cnt].size |=
                                    PROT_READ;
                        else
                                mem_clusters[mem_cluster_cnt].size |=
                                    PROT_READ | PROT_WRITE | PROT_EXEC;
                        mem_cluster_cnt++;
                } /* XXX else print something! */

                if (memc->mddt_usage & MDDT_mbz) {
                        mddtweird = 1;
                        printf("WARNING: mem cluster %d has weird "
                            "usage 0x%lx\n", i, (long)memc->mddt_usage);
                        unknownmem += memc->mddt_pg_cnt;
                        continue;
                }
                if (memc->mddt_usage & MDDT_NONVOLATILE) {
                        /* XXX should handle these... */
                        printf("WARNING: skipping non-volatile mem "
                            "cluster %d\n", i);
                        unusedmem += memc->mddt_pg_cnt;
                        continue;
                }
                if (memc->mddt_usage & MDDT_PALCODE) {
                        resvmem += memc->mddt_pg_cnt;
                        continue;
                }

                /*
                 * We have a memory cluster available for system
                 * software use.  We must determine if this cluster
                 * holds the kernel.
                 */
                physmem += memc->mddt_pg_cnt;
                pfn0 = memc->mddt_pfn;
                pfn1 = memc->mddt_pfn + memc->mddt_pg_cnt;
                if (pfn0 <= kernstartpfn && kernendpfn <= pfn1) {
                        /*
                         * Must compute the location of the kernel
                         * within the segment.
                         */
#if 0
                        printf("Cluster %d contains kernel\n", i);
#endif
                        if (pfn0 < kernstartpfn) {
                                /*
                                 * There is a chunk before the kernel.
                                 */
#if 0
                                printf("Loading chunk before kernel: "
                                    "0x%lx / 0x%lx\n", pfn0, kernstartpfn);
#endif
                                uvm_page_physload(pfn0, kernstartpfn,
                                    pfn0, kernstartpfn, 0);
                        }
                        if (kernendpfn < pfn1) {
                                /*
                                 * There is a chunk after the kernel.
                                 */
#if 0
                                printf("Loading chunk after kernel: "
                                    "0x%lx / 0x%lx\n", kernendpfn, pfn1);
#endif
                                uvm_page_physload(kernendpfn, pfn1,
                                    kernendpfn, pfn1, 0);
                        }
                } else {
                        /*
                         * Just load this cluster as one chunk.
                         */
#if 0
                        printf("Loading cluster %d: 0x%lx / 0x%lx\n", i,
                            pfn0, pfn1);
#endif
                        uvm_page_physload(pfn0, pfn1, pfn0, pfn1, 0);
                }
        }

#ifdef DEBUG
        /*
         * Dump out the MDDT if it looks odd...
         */
        if (mddtweird) {
                printf("\n");
                printf("complete memory cluster information:\n");
                for (i = 0; i < mddtp->mddt_cluster_cnt; i++) {
                        printf("mddt %d:\n", i);
                        printf("\tpfn %lx\n",
                            mddtp->mddt_clusters[i].mddt_pfn);
                        printf("\tcnt %lx\n",
                            mddtp->mddt_clusters[i].mddt_pg_cnt);
                        printf("\ttest %lx\n",
                            mddtp->mddt_clusters[i].mddt_pg_test);
                        printf("\tbva %lx\n",
                            mddtp->mddt_clusters[i].mddt_v_bitaddr);
                        printf("\tbpa %lx\n",
                            mddtp->mddt_clusters[i].mddt_p_bitaddr);
                        printf("\tbcksum %lx\n",
                            mddtp->mddt_clusters[i].mddt_bit_cksum);
                        printf("\tusage %lx\n",
                            mddtp->mddt_clusters[i].mddt_usage);
                }
                printf("\n");
        }
#endif

        if (totalphysmem == 0)
                panic("can't happen: system seems to have no memory!");
#if 0
        printf("totalphysmem = %u\n", totalphysmem);
        printf("physmem = %u\n", physmem);
        printf("resvmem = %d\n", resvmem);
        printf("unusedmem = %d\n", unusedmem);
        printf("unknownmem = %d\n", unknownmem);
#endif

        /*
         * Initialize error message buffer (at end of core).
         */
        {
                vsize_t sz = (vsize_t)round_page(MSGBUFSIZE);
                vsize_t reqsz = sz;

                vps = &vm_physmem[vm_nphysseg - 1];

                /* shrink so that it'll fit in the last segment */
                if ((vps->avail_end - vps->avail_start) < atop(sz))
                        sz = ptoa(vps->avail_end - vps->avail_start);

                vps->end -= atop(sz);
                vps->avail_end -= atop(sz);
                initmsgbuf((caddr_t) ALPHA_PHYS_TO_K0SEG(ptoa(vps->end)), sz);

                /* Remove the last segment if it now has no pages. */
                if (vps->start == vps->end)
                        vm_nphysseg--;

                /* warn if the message buffer had to be shrunk */
                if (sz != reqsz)
                        printf("WARNING: %ld bytes not available for msgbuf "
                            "in last cluster (%ld used)\n", reqsz, sz);

        }

        /*
         * Init mapping for u page(s) for proc 0
         */
        proc0.p_addr = proc0paddr =
            (struct user *)pmap_steal_memory(UPAGES * PAGE_SIZE, NULL, NULL);

        /*
         * Initialize the virtual memory system, and set the
         * page table base register in proc 0's PCB.
         */
        pmap_bootstrap(ALPHA_PHYS_TO_K0SEG(ptb << PGSHIFT),
            hwrpb->rpb_max_asn, hwrpb->rpb_pcs_cnt);

        /*
         * Initialize the rest of proc 0's PCB, and cache its physical
         * address.
         */
        proc0.p_md.md_pcbpaddr =
            (struct pcb *)ALPHA_K0SEG_TO_PHYS((vaddr_t)&proc0paddr->u_pcb);

        /*
         * Set the kernel sp, reserving space for an (empty) trapframe,
         * and make proc0's trapframe pointer point to it for sanity.
         */
        proc0paddr->u_pcb.pcb_hw.apcb_ksp =
            (u_int64_t)proc0paddr + USPACE - sizeof(struct trapframe);
        proc0.p_md.md_tf =
            (struct trapframe *)proc0paddr->u_pcb.pcb_hw.apcb_ksp;

        /*
         * Initialize the primary CPU's idle PCB to proc0's.  In a
         * MULTIPROCESSOR configuration, each CPU will later get
         * its own idle PCB when autoconfiguration runs.
         */
        ci->ci_idle_pcb = &proc0paddr->u_pcb;
        ci->ci_idle_pcb_paddr = (u_long)proc0.p_md.md_pcbpaddr;

        /*
         * Look at arguments passed to us and compute boothowto.
         */

        for (p = bootinfo.boot_flags; p && *p != '\0'; p++) {
                /*
                 * Note that we'd really like to differentiate case here,
                 * but the Alpha AXP Architecture Reference Manual
                 * says that we shouldn't.
                 */
                switch (*p) {
                case 'a': /* Ignore */
                case 'A':
                        break;

                case 'b': /* Enter DDB as soon as the console is initialised */
                case 'B':
                        boothowto |= RB_KDB;
                        break;

                case 'c': /* enter user kernel configuration */
                case 'C':
                        boothowto |= RB_CONFIG;
                        break;

#ifdef DEBUG
                case 'd': /* crash dump immediately after autoconfig */
                case 'D':
                        boothowto |= RB_DUMP;
                        break;
#endif

                case 'h': /* always halt, never reboot */
                case 'H':
                        boothowto |= RB_HALT;
                        break;


                case 'n': /* askname */
                case 'N':
                        boothowto |= RB_ASKNAME;
                        break;

                case 's': /* single-user */
                case 'S':
                        boothowto |= RB_SINGLE;
                        break;

                case '-':
                        /*
                         * Just ignore this.  It's not required, but it's
                         * common for it to be passed regardless.
                         */
                        break;

                default:
                        printf("Unrecognized boot flag '%c'.\n", *p);
                        break;
                }
        }


        /*
         * Figure out the number of cpus in the box, from RPB fields.
         * Really.  We mean it.
         */
        for (ncpusfound = 0, i = 0; i < hwrpb->rpb_pcs_cnt; i++) {
                struct pcs *pcsp;

                pcsp = LOCATE_PCS(hwrpb, i);
                if ((pcsp->pcs_flags & PCS_PP) != 0)
                        ncpusfound++;
        }

        /*
         * Initialize debuggers, and break into them if appropriate.
         */
#ifdef DDB
        db_machine_init();
        ddb_init();

        if (boothowto & RB_KDB)
                db_enter();
#endif
        /*
         * Figure out our clock frequency, from RPB fields.
         */
        hz = hwrpb->rpb_intr_freq >> 12;
        if (!(60 <= hz && hz <= 10240)) {
#ifdef DIAGNOSTIC
                printf("WARNING: unbelievable rpb_intr_freq: %lu (%d hz)\n",
                        (unsigned long)hwrpb->rpb_intr_freq, hz);
#endif
                hz = 1024;
        }
        tick = 1000000 / hz;
        tick_nsec = 1000000000 / hz;
}

void
consinit(void)
{
        /*
         * Everything related to console initialization is done
         * in alpha_init().
         */
}

void
cpu_startup(void)
{
        vaddr_t minaddr, maxaddr;
#if defined(DEBUG)
        extern int pmapdebug;
        int opmapdebug = pmapdebug;

        pmapdebug = 0;
#endif

        /*
         * Good {morning,afternoon,evening,night}.
         */
        printf("%s", version);
        identifycpu();
        printf("real mem = %lu (%luMB)\n", ptoa((psize_t)totalphysmem),
            ptoa((psize_t)totalphysmem) / 1024 / 1024);
        printf("rsvd mem = %lu (%luMB)\n", ptoa((psize_t)resvmem),
            ptoa((psize_t)resvmem) / 1024 / 1024);
        if (unusedmem) {
                printf("WARNING: unused memory = %lu (%luMB)\n",
                    ptoa((psize_t)unusedmem),
                    ptoa((psize_t)unusedmem) / 1024 / 1024);
        }
        if (unknownmem) {
                printf("WARNING: %lu (%luMB) of memory with unknown purpose\n",
                    ptoa((psize_t)unknownmem),
                    ptoa((psize_t)unknownmem) / 1024 / 1024);
        }

        /*
         * Allocate a submap for exec arguments.  This map effectively
         * limits the number of processes exec'ing at any time.
         */
        minaddr = vm_map_min(kernel_map);
        exec_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
            16 * NCARGS, VM_MAP_PAGEABLE, FALSE, NULL);

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

#if defined(DEBUG)
        pmapdebug = opmapdebug;
#endif
        printf("avail mem = %lu (%luMB)\n", ptoa((psize_t)uvmexp.free),
            ptoa((psize_t)uvmexp.free) / 1024 / 1024);
#if 0
        {
                extern u_long pmap_pages_stolen;

                printf("stolen memory for VM structures = %d\n", pmap_pages_stolen * PAGE_SIZE);
        }
#endif

        /*
         * Set up buffers, so they can be used to read disk labels.
         */
        bufinit();

        /*
         * Configure the system.
         */
        if (boothowto & RB_CONFIG) {
#ifdef BOOT_CONFIG
                user_config();
#else
                printf("kernel does not support -c; continuing..\n");
#endif
        }

        /*
         * Set up the HWPCB so that it's safe to configure secondary
         * CPUs.
         */
        hwrpb_primary_init();
}

/*
 * Retrieve the platform name from the DSR.
 */
const char *
alpha_dsr_sysname(void)
{
        struct dsrdb *dsr;
        const char *sysname;

        /*
         * DSR does not exist on early HWRPB versions.
         */
        if (hwrpb->rpb_version < HWRPB_DSRDB_MINVERS)
                return (NULL);

        dsr = (struct dsrdb *)(((caddr_t)hwrpb) + hwrpb->rpb_dsrdb_off);
        sysname = (const char *)((caddr_t)dsr + (dsr->dsr_sysname_off +
            sizeof(u_int64_t)));
        return (sysname);
}

/*
 * Lookup the system specified system variation in the provided table,
 * returning the model string on match.
 */
const char *
alpha_variation_name(u_int64_t variation,
    const struct alpha_variation_table *avtp)
{
        int i;

        for (i = 0; avtp[i].avt_model != NULL; i++)
                if (avtp[i].avt_variation == variation)
                        return (avtp[i].avt_model);
        return (NULL);
}

/*
 * Generate a default platform name based for unknown system variations.
 */
const char *
alpha_unknown_sysname(void)
{
        static char s[128];             /* safe size */

        snprintf(s, sizeof s, "%s family, unknown model variation 0x%lx",
            platform.family, (unsigned long)hwrpb->rpb_variation & SV_ST_MASK);
        return ((const char *)s);
}

void
identifycpu(void)
{
        char *s;
        int slen;

        /*
         * print out CPU identification information.
         */
        printf("%s", cpu_model);
        for(s = cpu_model; *s; ++s)
                if(strncasecmp(s, "MHz", 3) == 0)
                        goto skipMHz;
        printf(", %luMHz", (unsigned long)hwrpb->rpb_cc_freq / 1000000);
skipMHz:
        /* fill in hw_serial if a serial number is known */
        slen = strlen(hwrpb->rpb_ssn) + 1;
        if (slen > 1) {
                hw_serial = malloc(slen, M_SYSCTL, M_NOWAIT);
                if (hw_serial)
                        strlcpy(hw_serial, (char *)hwrpb->rpb_ssn, slen);
        }

        printf("\n");
        printf("%lu byte page size, %d processor%s.\n",
            (unsigned long)hwrpb->rpb_page_size, ncpusfound,
            ncpusfound == 1 ? "" : "s");
#if 0
        /* this is not particularly useful! */
        printf("variation: 0x%lx, revision 0x%lx\n",
            hwrpb->rpb_variation, *(long *)hwrpb->rpb_revision);
#endif
}

int     waittime = -1;
struct pcb dumppcb;

__dead void
boot(int howto)
{
#if defined(MULTIPROCESSOR)
        u_long wait_mask;
        int i;
#endif

        if ((howto & RB_RESET) != 0)
                goto doreset;

        if (cold) {
                if ((howto & RB_USERREQ) == 0)
                        howto |= RB_HALT;
                goto haltsys;
        }

        if ((boothowto & RB_HALT) != 0)
                howto |= RB_HALT;

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

                if ((howto & RB_TIMEBAD) == 0) {
                        resettodr();
                } else {
                        printf("WARNING: not updating battery clock\n");
                }
        }
        if_downall();

        uvm_shutdown();
        splhigh();
        cold = 1;

#if defined(MULTIPROCESSOR)
        /*
         * Halt all other CPUs.
         */
        wait_mask = (1UL << hwrpb->rpb_primary_cpu_id);
        alpha_broadcast_ipi(ALPHA_IPI_HALT);

        /* Ensure any CPUs paused by DDB resume execution so they can halt */
        cpus_paused = 0;

        for (i = 0; i < 10000; i++) {
                alpha_mb();
                if (cpus_running == wait_mask)
                        break;
                delay(1000);
        }
        alpha_mb();
        if (cpus_running != wait_mask)
                printf("WARNING: Unable to halt secondary CPUs (0x%lx)\n",
                    cpus_running);
#endif

        if ((howto & RB_DUMP) != 0)
                dumpsys();

haltsys:
        config_suspend_all(DVACT_POWERDOWN);

#ifdef BOOTKEY
        printf("hit any key to %s...\n",
            (howto & RB_HALT) != 0 ? "halt" : "reboot");
        cnpollc(1);     /* for proper keyboard command handling */
        cngetc();
        cnpollc(0);
        printf("\n");
#endif

        /* Finally, powerdown/halt/reboot the system. */
        if ((howto & RB_POWERDOWN) != 0 &&
            platform.powerdown != NULL) {
                (*platform.powerdown)();
                printf("WARNING: powerdown failed!\n");
        }
doreset:
        printf("%s\n\n",
            (howto & RB_HALT) != 0 ? "halted." : "rebooting...");
        prom_halt((howto & RB_HALT) != 0);
        for (;;)
                continue;
        /* NOTREACHED */
}

/*
 * These variables are needed by /sbin/savecore
 */
u_long  dumpmag = 0x8fca0101;   /* magic number */
int     dumpsize = 0;           /* pages */
long    dumplo = 0;             /* blocks */

/*
 * cpu_dumpsize: calculate size of machine-dependent kernel core dump headers.
 */
int
cpu_dumpsize(void)
{
        int size;

        size = ALIGN(sizeof(kcore_seg_t)) + ALIGN(sizeof(cpu_kcore_hdr_t)) +
            ALIGN(mem_cluster_cnt * sizeof(phys_ram_seg_t));
        if (roundup(size, dbtob(1)) != dbtob(1))
                return -1;

        return (1);
}

/*
 * cpu_dump_mempagecnt: calculate size of RAM (in pages) to be dumped.
 */
u_long
cpu_dump_mempagecnt(void)
{
        u_long i, n;

        n = 0;
        for (i = 0; i < mem_cluster_cnt; i++)
                n += atop(mem_clusters[i].size);
        return (n);
}

/*
 * cpu_dump: dump machine-dependent kernel core dump headers.
 */
int
cpu_dump(void)
{
        int (*dump)(dev_t, daddr_t, caddr_t, size_t);
        char buf[dbtob(1)];
        kcore_seg_t *segp;
        cpu_kcore_hdr_t *cpuhdrp;
        phys_ram_seg_t *memsegp;
        int i;

        dump = bdevsw[major(dumpdev)].d_dump;

        bzero(buf, sizeof buf);
        segp = (kcore_seg_t *)buf;
        cpuhdrp = (cpu_kcore_hdr_t *)&buf[ALIGN(sizeof(*segp))];
        memsegp = (phys_ram_seg_t *)&buf[ALIGN(sizeof(*segp)) +
            ALIGN(sizeof(*cpuhdrp))];

        /*
         * Generate a segment header.
         */
        CORE_SETMAGIC(*segp, KCORE_MAGIC, MID_MACHINE, CORE_CPU);
        segp->c_size = dbtob(1) - ALIGN(sizeof(*segp));

        /*
         * Add the machine-dependent header info.
         */
        cpuhdrp->lev1map_pa = ALPHA_K0SEG_TO_PHYS((vaddr_t)kernel_lev1map);
        cpuhdrp->page_size = PAGE_SIZE;
        cpuhdrp->nmemsegs = mem_cluster_cnt;

        /*
         * Fill in the memory segment descriptors.
         */
        for (i = 0; i < mem_cluster_cnt; i++) {
                memsegp[i].start = mem_clusters[i].start;
                memsegp[i].size = mem_clusters[i].size & ~PAGE_MASK;
        }

        return (dump(dumpdev, dumplo, (caddr_t)buf, dbtob(1)));
}

/*
 * This is called by main to set dumplo and dumpsize.
 * Dumps always skip the first PAGE_SIZE of disk space
 * in case there might be a disk label stored there.
 * If there is extra space, put dump at the end to
 * reduce the chance that swapping trashes it.
 */
void
dumpconf(void)
{
        int nblks, dumpblks;    /* size of dump area */

        if (dumpdev == NODEV ||
            (nblks = (bdevsw[major(dumpdev)].d_psize)(dumpdev)) == 0)
                return;
        if (nblks <= ctod(1))
                return;

        dumpblks = cpu_dumpsize();
        if (dumpblks < 0)
                return;
        dumpblks += ctod(cpu_dump_mempagecnt());

        /* If dump won't fit (incl. room for possible label), punt. */
        if (dumpblks > (nblks - ctod(1)))
                return;

        /* Put dump at end of partition */
        dumplo = nblks - dumpblks;

        /* dumpsize is in page units, and doesn't include headers. */
        dumpsize = cpu_dump_mempagecnt();
}

/*
 * Dump the kernel's image to the swap partition.
 */
#define BYTES_PER_DUMP  PAGE_SIZE

void
dumpsys(void)
{
        u_long totalbytesleft, bytes, i, n, memcl;
        u_long maddr;
        int psize;
        daddr_t blkno;
        int (*dump)(dev_t, daddr_t, caddr_t, size_t);
        int error;
        extern int msgbufmapped;

        /* Save registers. */
        savectx(&dumppcb);

        msgbufmapped = 0;       /* don't record dump msgs in msgbuf */
        if (dumpdev == NODEV)
                return;

        /*
         * For dumps during autoconfiguration,
         * if dump device has already configured...
         */
        if (dumpsize == 0)
                dumpconf();
        if (dumplo <= 0) {
                printf("\ndump to dev %u,%u not possible\n", major(dumpdev),
                    minor(dumpdev));
                return;
        }
        printf("\ndumping to dev %u,%u offset %ld\n", major(dumpdev),
            minor(dumpdev), dumplo);

        psize = (*bdevsw[major(dumpdev)].d_psize)(dumpdev);
        printf("dump ");
        if (psize == -1) {
                printf("area unavailable\n");
                return;
        }

        /* XXX should purge all outstanding keystrokes. */

        if ((error = cpu_dump()) != 0)
                goto err;

        totalbytesleft = ptoa(cpu_dump_mempagecnt());
        blkno = dumplo + cpu_dumpsize();
        dump = bdevsw[major(dumpdev)].d_dump;
        error = 0;

        for (memcl = 0; memcl < mem_cluster_cnt; memcl++) {
                maddr = mem_clusters[memcl].start;
                bytes = mem_clusters[memcl].size & ~PAGE_MASK;

                for (i = 0; i < bytes; i += n, totalbytesleft -= n) {

                        /* Print out how many MBs we to go. */
                        if ((totalbytesleft % (1024*1024)) == 0)
                                printf("%ld ", totalbytesleft / (1024 * 1024));

                        /* Limit size for next transfer. */
                        n = bytes - i;
                        if (n > BYTES_PER_DUMP)
                                n =  BYTES_PER_DUMP;
        
                        error = (*dump)(dumpdev, blkno,
                            (caddr_t)ALPHA_PHYS_TO_K0SEG(maddr), n);
                        if (error)
                                goto err;
                        maddr += n;
                        blkno += btodb(n);                      /* XXX? */

                        /* XXX should look for keystrokes, to cancel. */
                }
        }

err:
        switch (error) {
#ifdef DEBUG
        case ENXIO:
                printf("device bad\n");
                break;

        case EFAULT:
                printf("device not ready\n");
                break;

        case EINVAL:
                printf("area improper\n");
                break;

        case EIO:
                printf("i/o error\n");
                break;

        case EINTR:
                printf("aborted from console\n");
                break;
#endif /* DEBUG */
        case 0:
                printf("succeeded\n");
                break;

        default:
                printf("error %d\n", error);
                break;
        }
        printf("\n\n");
        delay(1000);
}

void
frametoreg(struct trapframe *framep, struct reg *regp)
{

        regp->r_regs[R_V0] = framep->tf_regs[FRAME_V0];
        regp->r_regs[R_T0] = framep->tf_regs[FRAME_T0];
        regp->r_regs[R_T1] = framep->tf_regs[FRAME_T1];
        regp->r_regs[R_T2] = framep->tf_regs[FRAME_T2];
        regp->r_regs[R_T3] = framep->tf_regs[FRAME_T3];
        regp->r_regs[R_T4] = framep->tf_regs[FRAME_T4];
        regp->r_regs[R_T5] = framep->tf_regs[FRAME_T5];
        regp->r_regs[R_T6] = framep->tf_regs[FRAME_T6];
        regp->r_regs[R_T7] = framep->tf_regs[FRAME_T7];
        regp->r_regs[R_S0] = framep->tf_regs[FRAME_S0];
        regp->r_regs[R_S1] = framep->tf_regs[FRAME_S1];
        regp->r_regs[R_S2] = framep->tf_regs[FRAME_S2];
        regp->r_regs[R_S3] = framep->tf_regs[FRAME_S3];
        regp->r_regs[R_S4] = framep->tf_regs[FRAME_S4];
        regp->r_regs[R_S5] = framep->tf_regs[FRAME_S5];
        regp->r_regs[R_S6] = framep->tf_regs[FRAME_S6];
        regp->r_regs[R_A0] = framep->tf_regs[FRAME_A0];
        regp->r_regs[R_A1] = framep->tf_regs[FRAME_A1];
        regp->r_regs[R_A2] = framep->tf_regs[FRAME_A2];
        regp->r_regs[R_A3] = framep->tf_regs[FRAME_A3];
        regp->r_regs[R_A4] = framep->tf_regs[FRAME_A4];
        regp->r_regs[R_A5] = framep->tf_regs[FRAME_A5];
        regp->r_regs[R_T8] = framep->tf_regs[FRAME_T8];
        regp->r_regs[R_T9] = framep->tf_regs[FRAME_T9];
        regp->r_regs[R_T10] = framep->tf_regs[FRAME_T10];
        regp->r_regs[R_T11] = framep->tf_regs[FRAME_T11];
        regp->r_regs[R_RA] = framep->tf_regs[FRAME_RA];
        regp->r_regs[R_T12] = framep->tf_regs[FRAME_T12];
        regp->r_regs[R_AT] = framep->tf_regs[FRAME_AT];
        regp->r_regs[R_GP] = framep->tf_regs[FRAME_GP];
        /* regp->r_regs[R_SP] = framep->tf_regs[FRAME_SP]; XXX */
        regp->r_regs[R_ZERO] = 0;
}

void
regtoframe(struct reg *regp, struct trapframe *framep)
{

        framep->tf_regs[FRAME_V0] = regp->r_regs[R_V0];
        framep->tf_regs[FRAME_T0] = regp->r_regs[R_T0];
        framep->tf_regs[FRAME_T1] = regp->r_regs[R_T1];
        framep->tf_regs[FRAME_T2] = regp->r_regs[R_T2];
        framep->tf_regs[FRAME_T3] = regp->r_regs[R_T3];
        framep->tf_regs[FRAME_T4] = regp->r_regs[R_T4];
        framep->tf_regs[FRAME_T5] = regp->r_regs[R_T5];
        framep->tf_regs[FRAME_T6] = regp->r_regs[R_T6];
        framep->tf_regs[FRAME_T7] = regp->r_regs[R_T7];
        framep->tf_regs[FRAME_S0] = regp->r_regs[R_S0];
        framep->tf_regs[FRAME_S1] = regp->r_regs[R_S1];
        framep->tf_regs[FRAME_S2] = regp->r_regs[R_S2];
        framep->tf_regs[FRAME_S3] = regp->r_regs[R_S3];
        framep->tf_regs[FRAME_S4] = regp->r_regs[R_S4];
        framep->tf_regs[FRAME_S5] = regp->r_regs[R_S5];
        framep->tf_regs[FRAME_S6] = regp->r_regs[R_S6];
        framep->tf_regs[FRAME_A0] = regp->r_regs[R_A0];
        framep->tf_regs[FRAME_A1] = regp->r_regs[R_A1];
        framep->tf_regs[FRAME_A2] = regp->r_regs[R_A2];
        framep->tf_regs[FRAME_A3] = regp->r_regs[R_A3];
        framep->tf_regs[FRAME_A4] = regp->r_regs[R_A4];
        framep->tf_regs[FRAME_A5] = regp->r_regs[R_A5];
        framep->tf_regs[FRAME_T8] = regp->r_regs[R_T8];
        framep->tf_regs[FRAME_T9] = regp->r_regs[R_T9];
        framep->tf_regs[FRAME_T10] = regp->r_regs[R_T10];
        framep->tf_regs[FRAME_T11] = regp->r_regs[R_T11];
        framep->tf_regs[FRAME_RA] = regp->r_regs[R_RA];
        framep->tf_regs[FRAME_T12] = regp->r_regs[R_T12];
        framep->tf_regs[FRAME_AT] = regp->r_regs[R_AT];
        framep->tf_regs[FRAME_GP] = regp->r_regs[R_GP];
        /* framep->tf_regs[FRAME_SP] = regp->r_regs[R_SP]; XXX */
        /* ??? = regp->r_regs[R_ZERO]; */
}

void
printregs(struct reg *regp)
{
        int i;

        for (i = 0; i < 32; i++)
                printf("R%d:\t0x%016lx%s", i, regp->r_regs[i],
                   i & 1 ? "\n" : "\t");
}

void
regdump(struct trapframe *framep)
{
        struct reg reg;

        frametoreg(framep, &reg);
        reg.r_regs[R_SP] = alpha_pal_rdusp();

        printf("REGISTERS:\n");
        printregs(&reg);
}

/*
 * Send an interrupt to process.
 */
int
sendsig(sig_t catcher, int sig, sigset_t mask, const siginfo_t *ksip,
    int info, int onstack)
{
        struct proc *p = curproc;
        struct sigcontext ksc, *scp;
        struct fpreg *fpregs = (struct fpreg *)&ksc.sc_fpregs;
        struct trapframe *frame;
        unsigned long oldsp;
        int fsize, rndfsize, kscsize;
        siginfo_t *sip;

        oldsp = alpha_pal_rdusp();
        frame = p->p_md.md_tf;
        fsize = sizeof ksc;
        rndfsize = ((fsize + 15) / 16) * 16;
        kscsize = rndfsize;

        if (info) {
                fsize += sizeof *ksip;
                rndfsize = ((fsize + 15) / 16) * 16;
        }

        /*
         * Allocate space for the signal handler context.
         */
        if ((p->p_sigstk.ss_flags & SS_DISABLE) == 0 &&
            !sigonstack(oldsp) && onstack)
                scp = (struct sigcontext *)
                    (trunc_page((vaddr_t)p->p_sigstk.ss_sp + p->p_sigstk.ss_size)
                    - rndfsize);
        else
                scp = (struct sigcontext *)(oldsp - rndfsize);

        /*
         * Build the signal context to be used by sigreturn.
         */
        bzero(&ksc, sizeof(ksc));
        ksc.sc_mask = mask;
        ksc.sc_pc = frame->tf_regs[FRAME_PC];
        ksc.sc_ps = frame->tf_regs[FRAME_PS];

        /* copy the registers. */
        frametoreg(frame, (struct reg *)ksc.sc_regs);
        ksc.sc_regs[R_SP] = oldsp;

        /* save the floating-point state, if necessary, then copy it. */
        if (p->p_addr->u_pcb.pcb_fpcpu != NULL)
                fpusave_proc(p, 1);
        ksc.sc_ownedfp = p->p_md.md_flags & MDP_FPUSED;
        memcpy(/*ksc.sc_*/fpregs, &p->p_addr->u_pcb.pcb_fp,
            sizeof(struct fpreg));
#ifndef NO_IEEE
        ksc.sc_fp_control = alpha_read_fp_c(p);
#else
        ksc.sc_fp_control = 0;
#endif
        memset(ksc.sc_reserved, 0, sizeof ksc.sc_reserved);     /* XXX */
        memset(ksc.sc_xxx, 0, sizeof ksc.sc_xxx);               /* XXX */

        if (info) {
                sip = (void *)scp + kscsize;
                if (copyout(ksip, (caddr_t)sip, fsize - kscsize) != 0)
                        return 1;
        } else
                sip = NULL;

        ksc.sc_cookie = (long)scp ^ p->p_p->ps_sigcookie;
        if (copyout((caddr_t)&ksc, (caddr_t)scp, kscsize) != 0)
                return 1;

        /*
         * Set up the registers to return to sigcode.
         */
        frame->tf_regs[FRAME_PC] = p->p_p->ps_sigcode;
        frame->tf_regs[FRAME_A0] = sig;
        frame->tf_regs[FRAME_A1] = (u_int64_t)sip;
        frame->tf_regs[FRAME_A2] = (u_int64_t)scp;
        frame->tf_regs[FRAME_T12] = (u_int64_t)catcher;         /* t12 is pv */
        alpha_pal_wrusp((unsigned long)scp);

        return 0;
}

/*
 * System call to cleanup state after a signal
 * has been taken.  Reset signal mask and
 * stack state from context left by sendsig (above).
 * Return to previous pc and psl as specified by
 * context left by sendsig. Check carefully to
 * make sure that the user has not modified the
 * psl to gain improper privileges or to cause
 * a machine fault.
 */
int
sys_sigreturn(struct proc *p, void *v, register_t *retval)
{
        struct sys_sigreturn_args /* {
                syscallarg(struct sigcontext *) sigcntxp;
        } */ *uap = v;
        struct sigcontext ksc, *scp = SCARG(uap, sigcntxp);
        struct fpreg *fpregs = (struct fpreg *)&ksc.sc_fpregs;
        int error;

        if (PROC_PC(p) != p->p_p->ps_sigcoderet) {
                sigexit(p, SIGILL);
                return (EPERM);
        }

        if ((error = copyin(scp, &ksc, sizeof(ksc))) != 0)
                return (error);

        if (ksc.sc_cookie != ((long)scp ^ p->p_p->ps_sigcookie)) {
                sigexit(p, SIGILL);
                return (EFAULT);
        }

        /* Prevent reuse of the sigcontext cookie */
        ksc.sc_cookie = 0;
        (void)copyout(&ksc.sc_cookie, (caddr_t)scp +
            offsetof(struct sigcontext, sc_cookie), sizeof (ksc.sc_cookie));

        /*
         * Restore the user-supplied information
         */
        p->p_sigmask = ksc.sc_mask &~ sigcantmask;

        p->p_md.md_tf->tf_regs[FRAME_PC] = ksc.sc_pc;
        p->p_md.md_tf->tf_regs[FRAME_PS] =
            (ksc.sc_ps | ALPHA_PSL_USERSET) & ~ALPHA_PSL_USERCLR;

        regtoframe((struct reg *)ksc.sc_regs, p->p_md.md_tf);
        alpha_pal_wrusp(ksc.sc_regs[R_SP]);

        /* XXX ksc.sc_ownedfp ? */
        if (p->p_addr->u_pcb.pcb_fpcpu != NULL)
                fpusave_proc(p, 0);
        memcpy(&p->p_addr->u_pcb.pcb_fp, /*ksc.sc_*/fpregs,
            sizeof(struct fpreg));
#ifndef NO_IEEE
        p->p_addr->u_pcb.pcb_fp.fpr_cr = ksc.sc_fpcr;
        p->p_md.md_flags = ksc.sc_fp_control & MDP_FP_C;
#endif
        return (EJUSTRETURN);
}

/*
 * machine dependent system variables.
 */
int
cpu_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
    size_t newlen, struct proc *p)
{
        dev_t consdev;
#if NIOASIC > 0
        int oldval, ret;
#endif

        if (name[0] != CPU_CHIPSET && namelen != 1)
                return (ENOTDIR);               /* overloaded */

        switch (name[0]) {
        case CPU_CONSDEV:
                if (cn_tab != NULL)
                        consdev = cn_tab->cn_dev;
                else
                        consdev = NODEV;
                return (sysctl_rdstruct(oldp, oldlenp, newp, &consdev,
                        sizeof consdev));

#ifndef SMALL_KERNEL
        case CPU_BOOTED_KERNEL:
                return (sysctl_rdstring(oldp, oldlenp, newp,
                    bootinfo.booted_kernel));
        
        case CPU_CHIPSET:
                return (alpha_sysctl_chipset(name + 1, namelen - 1, oldp,
                    oldlenp));
#endif /* SMALL_KERNEL */

#ifndef NO_IEEE
        case CPU_FP_SYNC_COMPLETE:
                return (sysctl_int(oldp, oldlenp, newp, newlen,
                    &alpha_fp_sync_complete));
#endif
        case CPU_ALLOWAPERTURE:
#ifdef APERTURE
                if (securelevel > 0)
                        return (sysctl_int_lower(oldp, oldlenp, newp, newlen,
                            &allowaperture));
                else
                        return (sysctl_int(oldp, oldlenp, newp, newlen,
                            &allowaperture));
#else
                return (sysctl_rdint(oldp, oldlenp, newp, 0));
#endif
#if NIOASIC > 0
        case CPU_LED_BLINK:
                oldval = alpha_led_blink;
                ret = sysctl_int(oldp, oldlenp, newp, newlen, &alpha_led_blink);
                if (oldval != alpha_led_blink)
                        ioasic_led_blink(NULL);
                return (ret);
#endif
        default:
                return (EOPNOTSUPP);
        }
        /* NOTREACHED */
}

/*
 * Set registers on exec.
 */
void
setregs(struct proc *p, struct exec_package *pack, u_long stack,
    struct ps_strings *arginfo)
{
        struct trapframe *tfp = p->p_md.md_tf;
#ifdef DEBUG
        int i;
#endif

#ifdef DEBUG
        /*
         * Crash and dump, if the user requested it.
         */
        if (boothowto & RB_DUMP)
                panic("crash requested by boot flags");
#endif

#ifdef DEBUG
        for (i = 0; i < FRAME_SIZE; i++)
                tfp->tf_regs[i] = 0xbabefacedeadbeef;
        tfp->tf_regs[FRAME_A1] = 0;
#else
        memset(tfp->tf_regs, 0, FRAME_SIZE * sizeof tfp->tf_regs[0]);
#endif
        memset(&p->p_addr->u_pcb.pcb_fp, 0, sizeof p->p_addr->u_pcb.pcb_fp);
        alpha_pal_wrusp(stack);
        tfp->tf_regs[FRAME_PS] = ALPHA_PSL_USERSET;
        tfp->tf_regs[FRAME_PC] = pack->ep_entry & ~3;

        tfp->tf_regs[FRAME_A0] = stack;
        /* a1 and a2 already zeroed */
        tfp->tf_regs[FRAME_T12] = tfp->tf_regs[FRAME_PC];       /* a.k.a. PV */

        p->p_md.md_flags &= ~MDP_FPUSED;
#ifndef NO_IEEE
        if (__predict_true((p->p_md.md_flags & IEEE_INHERIT) == 0)) {
                p->p_md.md_flags &= ~MDP_FP_C;
                p->p_addr->u_pcb.pcb_fp.fpr_cr = FPCR_DYN(FP_RN);
        }
#endif
        if (p->p_addr->u_pcb.pcb_fpcpu != NULL)
                fpusave_proc(p, 0);
}

/*
 * Release the FPU.
 */
void
fpusave_cpu(struct cpu_info *ci, int save)
{
        struct proc *p;
#if defined(MULTIPROCESSOR)
        int s;
#endif

        KDASSERT(ci == curcpu());

#if defined(MULTIPROCESSOR)
        /* Need to block IPIs */
        s = splipi();
        atomic_setbits_ulong(&ci->ci_flags, CPUF_FPUSAVE);
#endif

        p = ci->ci_fpcurproc;
        if (p == NULL)
                goto out;

        if (save) {
                alpha_pal_wrfen(1);
                savefpstate(&p->p_addr->u_pcb.pcb_fp);
        }

        alpha_pal_wrfen(0);

        p->p_addr->u_pcb.pcb_fpcpu = NULL;
        ci->ci_fpcurproc = NULL;

out:
#if defined(MULTIPROCESSOR)
        atomic_clearbits_ulong(&ci->ci_flags, CPUF_FPUSAVE);
        alpha_pal_swpipl(s);
#endif
        return;
}

/*
 * Synchronize FP state for this process.
 */
void
fpusave_proc(struct proc *p, int save)
{
        struct cpu_info *ci = curcpu();
        struct cpu_info *oci;
#if defined(MULTIPROCESSOR)
        u_long ipi = save ? ALPHA_IPI_SYNCH_FPU : ALPHA_IPI_DISCARD_FPU;
        int s;
#endif

        KDASSERT(p->p_addr != NULL);

        for (;;) {
#if defined(MULTIPROCESSOR)
                /* Need to block IPIs */
                s = splipi();
#endif

                oci = p->p_addr->u_pcb.pcb_fpcpu;
                if (oci == NULL) {
#if defined(MULTIPROCESSOR)
                        alpha_pal_swpipl(s);
#endif
                        return;
                }

#if defined(MULTIPROCESSOR)
                if (oci == ci) {
                        KASSERT(ci->ci_fpcurproc == p);
                        alpha_pal_swpipl(s);
                        fpusave_cpu(ci, save);
                        return;
                }

                /*
                 * The other cpu may still be running and could have
                 * discarded the fpu context on its own.
                 */
                if (oci->ci_fpcurproc != p) {
                        alpha_pal_swpipl(s);
                        continue;
                }

                alpha_send_ipi(oci->ci_cpuid, ipi);
                alpha_pal_swpipl(s);

                while (p->p_addr->u_pcb.pcb_fpcpu != NULL)
                        CPU_BUSY_CYCLE();
#else
                KASSERT(ci->ci_fpcurproc == p);
                fpusave_cpu(ci, save);
#endif /* MULTIPROCESSOR */

                break;
        }
}

int
spl0(void)
{

        if (ssir) {
                (void) alpha_pal_swpipl(ALPHA_PSL_IPL_SOFT);
                dosoftint();
        }

        return (alpha_pal_swpipl(ALPHA_PSL_IPL_0));
}

/*
 * Wait "n" microseconds.
 */
void
delay(unsigned long n)
{
        unsigned long pcc0, pcc1, curcycle, cycles, usec;

        if (n == 0)
                return;

        pcc0 = alpha_rpcc() & 0xffffffffUL;
        cycles = 0;
        usec = 0;

        while (usec <= n) {
                /*
                 * Get the next CPU cycle count - assumes that we can not
                 * have had more than one 32 bit overflow.
                 */
                pcc1 = alpha_rpcc() & 0xffffffffUL;
                if (pcc1 < pcc0)
                        curcycle = (pcc1 + 0x100000000UL) - pcc0;
                else
                        curcycle = pcc1 - pcc0;

                /*
                 * We now have the number of processor cycles since we
                 * last checked. Add the current cycle count to the
                 * running total. If it's over cycles_per_usec, increment
                 * the usec counter.
                 */
                cycles += curcycle;
                while (cycles >= cycles_per_usec) {
                        usec++;
                        cycles -= cycles_per_usec;
                }
                pcc0 = pcc1;
        }
}

int
alpha_pa_access(u_long pa)
{
        int i;

        for (i = 0; i < mem_cluster_cnt; i++) {
                if (pa < mem_clusters[i].start)
                        continue;
                if ((pa - mem_clusters[i].start) >=
                    (mem_clusters[i].size & ~PAGE_MASK))
                        continue;
                return (mem_clusters[i].size & PAGE_MASK);      /* prot */
        }

        /*
         * Address is not a memory address.  If we're secure, disallow
         * access.  Otherwise, grant read/write.
         */
        if (securelevel > 0)
                return (PROT_NONE);
        else
                return (PROT_READ | PROT_WRITE);
}

/* XXX XXX BEGIN XXX XXX */
paddr_t alpha_XXX_dmamap_or;                                    /* XXX */
                                                                /* XXX */
paddr_t                                                         /* XXX */
alpha_XXX_dmamap(vaddr_t v)                                     /* XXX */
{                                                               /* XXX */
                                                                /* XXX */
        return (vtophys(v) | alpha_XXX_dmamap_or);              /* XXX */
}                                                               /* XXX */
/* XXX XXX END XXX XXX */