The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/ia64/ia64/machdep.c

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    1 /*-
    2  * Copyright (c) 2003,2004 Marcel Moolenaar
    3  * Copyright (c) 2000,2001 Doug Rabson
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/8.2/sys/ia64/ia64/machdep.c 206336 2010-04-07 02:24:41Z nwhitehorn $");
   30 
   31 #include "opt_compat.h"
   32 #include "opt_ddb.h"
   33 #include "opt_kstack_pages.h"
   34 #include "opt_msgbuf.h"
   35 #include "opt_sched.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/proc.h>
   39 #include <sys/systm.h>
   40 #include <sys/bio.h>
   41 #include <sys/buf.h>
   42 #include <sys/bus.h>
   43 #include <sys/cons.h>
   44 #include <sys/cpu.h>
   45 #include <sys/eventhandler.h>
   46 #include <sys/exec.h>
   47 #include <sys/imgact.h>
   48 #include <sys/kdb.h>
   49 #include <sys/kernel.h>
   50 #include <sys/linker.h>
   51 #include <sys/lock.h>
   52 #include <sys/malloc.h>
   53 #include <sys/mbuf.h>
   54 #include <sys/msgbuf.h>
   55 #include <sys/pcpu.h>
   56 #include <sys/ptrace.h>
   57 #include <sys/random.h>
   58 #include <sys/reboot.h>
   59 #include <sys/sched.h>
   60 #include <sys/signalvar.h>
   61 #include <sys/syscall.h>
   62 #include <sys/sysctl.h>
   63 #include <sys/sysproto.h>
   64 #include <sys/ucontext.h>
   65 #include <sys/uio.h>
   66 #include <sys/uuid.h>
   67 #include <sys/vmmeter.h>
   68 #include <sys/vnode.h>
   69 
   70 #include <ddb/ddb.h>
   71 
   72 #include <net/netisr.h>
   73 
   74 #include <vm/vm.h>
   75 #include <vm/vm_extern.h>
   76 #include <vm/vm_kern.h>
   77 #include <vm/vm_page.h>
   78 #include <vm/vm_map.h>
   79 #include <vm/vm_object.h>
   80 #include <vm/vm_pager.h>
   81 
   82 #include <machine/bootinfo.h>
   83 #include <machine/cpu.h>
   84 #include <machine/efi.h>
   85 #include <machine/elf.h>
   86 #include <machine/fpu.h>
   87 #include <machine/intr.h>
   88 #include <machine/mca.h>
   89 #include <machine/md_var.h>
   90 #include <machine/mutex.h>
   91 #include <machine/pal.h>
   92 #include <machine/pcb.h>
   93 #include <machine/reg.h>
   94 #include <machine/sal.h>
   95 #include <machine/sigframe.h>
   96 #ifdef SMP
   97 #include <machine/smp.h>
   98 #endif
   99 #include <machine/unwind.h>
  100 #include <machine/vmparam.h>
  101 
  102 SYSCTL_NODE(_hw, OID_AUTO, freq, CTLFLAG_RD, 0, "");
  103 SYSCTL_NODE(_machdep, OID_AUTO, cpu, CTLFLAG_RD, 0, "");
  104 
  105 static u_int bus_freq;
  106 SYSCTL_UINT(_hw_freq, OID_AUTO, bus, CTLFLAG_RD, &bus_freq, 0,
  107     "Bus clock frequency");
  108 
  109 static u_int cpu_freq;
  110 SYSCTL_UINT(_hw_freq, OID_AUTO, cpu, CTLFLAG_RD, &cpu_freq, 0,
  111     "CPU clock frequency");
  112 
  113 static u_int itc_freq;
  114 SYSCTL_UINT(_hw_freq, OID_AUTO, itc, CTLFLAG_RD, &itc_freq, 0,
  115     "ITC frequency");
  116 
  117 int cold = 1;
  118 
  119 u_int64_t pa_bootinfo;
  120 struct bootinfo bootinfo;
  121 
  122 struct pcpu pcpu0;
  123 
  124 extern u_int64_t kernel_text[], _end[];
  125 
  126 extern u_int64_t ia64_gateway_page[];
  127 extern u_int64_t break_sigtramp[];
  128 extern u_int64_t epc_sigtramp[];
  129 
  130 struct fpswa_iface *fpswa_iface;
  131 
  132 u_int64_t ia64_pal_base;
  133 u_int64_t ia64_port_base;
  134 
  135 u_int64_t ia64_lapic_addr = PAL_PIB_DEFAULT_ADDR;
  136 
  137 struct ia64_pib *ia64_pib;
  138 
  139 static int ia64_sync_icache_needed;
  140 
  141 char machine[] = MACHINE;
  142 SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0, "");
  143 
  144 static char cpu_model[64];
  145 SYSCTL_STRING(_hw, HW_MODEL, model, CTLFLAG_RD, cpu_model, 0,
  146     "The CPU model name");
  147 
  148 static char cpu_family[64];
  149 SYSCTL_STRING(_hw, OID_AUTO, family, CTLFLAG_RD, cpu_family, 0,
  150     "The CPU family name");
  151 
  152 #ifdef DDB
  153 extern vm_offset_t ksym_start, ksym_end;
  154 #endif
  155 
  156 
  157 struct msgbuf *msgbufp = NULL;
  158 
  159 /* Other subsystems (e.g., ACPI) can hook this later. */
  160 void (*cpu_idle_hook)(void) = NULL;
  161 
  162 long Maxmem = 0;
  163 long realmem = 0;
  164 
  165 #define PHYSMAP_SIZE    (2 * VM_PHYSSEG_MAX)
  166 
  167 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
  168 
  169 /* must be 2 less so 0 0 can signal end of chunks */
  170 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2)
  171 
  172 struct kva_md_info kmi;
  173 
  174 #define Mhz     1000000L
  175 #define Ghz     (1000L*Mhz)
  176 
  177 static void
  178 identifycpu(void)
  179 {
  180         char vendor[17];
  181         char *family_name, *model_name;
  182         u_int64_t features, tmp;
  183         int number, revision, model, family, archrev;
  184 
  185         /*
  186          * Assumes little-endian.
  187          */
  188         *(u_int64_t *) &vendor[0] = ia64_get_cpuid(0);
  189         *(u_int64_t *) &vendor[8] = ia64_get_cpuid(1);
  190         vendor[16] = '\0';
  191 
  192         tmp = ia64_get_cpuid(3);
  193         number = (tmp >> 0) & 0xff;
  194         revision = (tmp >> 8) & 0xff;
  195         model = (tmp >> 16) & 0xff;
  196         family = (tmp >> 24) & 0xff;
  197         archrev = (tmp >> 32) & 0xff;
  198 
  199         family_name = model_name = "unknown";
  200         switch (family) {
  201         case 0x07:
  202                 family_name = "Itanium";
  203                 model_name = "Merced";
  204                 break;
  205         case 0x1f:
  206                 family_name = "Itanium 2";
  207                 switch (model) {
  208                 case 0x00:
  209                         model_name = "McKinley";
  210                         break;
  211                 case 0x01:
  212                         /*
  213                          * Deerfield is a low-voltage variant based on the
  214                          * Madison core. We need circumstantial evidence
  215                          * (i.e. the clock frequency) to identify those.
  216                          * Allow for roughly 1% error margin.
  217                          */
  218                         if (cpu_freq > 990 && cpu_freq < 1010)
  219                                 model_name = "Deerfield";
  220                         else
  221                                 model_name = "Madison";
  222                         break;
  223                 case 0x02:
  224                         model_name = "Madison II";
  225                         break;
  226                 }
  227                 break;
  228         case 0x20:
  229                 ia64_sync_icache_needed = 1;
  230 
  231                 family_name = "Itanium 2";
  232                 switch (model) {
  233                 case 0x00:
  234                         model_name = "Montecito";
  235                         break;
  236                 }
  237                 break;
  238         }
  239         snprintf(cpu_family, sizeof(cpu_family), "%s", family_name);
  240         snprintf(cpu_model, sizeof(cpu_model), "%s", model_name);
  241 
  242         features = ia64_get_cpuid(4);
  243 
  244         printf("CPU: %s (", model_name);
  245         if (cpu_freq)
  246                 printf("%u Mhz ", cpu_freq);
  247         printf("%s)\n", family_name);
  248         printf("  Origin = \"%s\"  Revision = %d\n", vendor, revision);
  249         printf("  Features = 0x%b\n", (u_int32_t) features,
  250             "\020"
  251             "\001LB"    /* long branch (brl) instruction. */
  252             "\002SD"    /* Spontaneous deferral. */
  253             "\003AO"    /* 16-byte atomic operations (ld, st, cmpxchg). */ );
  254 }
  255 
  256 static void
  257 cpu_startup(void *dummy)
  258 {
  259         char nodename[16];
  260         struct pcpu *pc;
  261         struct pcpu_stats *pcs;
  262 
  263         /*
  264          * Good {morning,afternoon,evening,night}.
  265          */
  266         identifycpu();
  267 
  268 #ifdef PERFMON
  269         perfmon_init();
  270 #endif
  271         printf("real memory  = %ld (%ld MB)\n", ia64_ptob(Maxmem),
  272             ia64_ptob(Maxmem) / 1048576);
  273         realmem = Maxmem;
  274 
  275         /*
  276          * Display any holes after the first chunk of extended memory.
  277          */
  278         if (bootverbose) {
  279                 int indx;
  280 
  281                 printf("Physical memory chunk(s):\n");
  282                 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
  283                         long size1 = phys_avail[indx + 1] - phys_avail[indx];
  284 
  285                         printf("0x%08lx - 0x%08lx, %ld bytes (%ld pages)\n",
  286                             phys_avail[indx], phys_avail[indx + 1] - 1, size1,
  287                             size1 >> PAGE_SHIFT);
  288                 }
  289         }
  290 
  291         vm_ksubmap_init(&kmi);
  292 
  293         printf("avail memory = %ld (%ld MB)\n", ptoa(cnt.v_free_count),
  294             ptoa(cnt.v_free_count) / 1048576);
  295  
  296         if (fpswa_iface == NULL)
  297                 printf("Warning: no FPSWA package supplied\n");
  298         else
  299                 printf("FPSWA Revision = 0x%lx, Entry = %p\n",
  300                     (long)fpswa_iface->if_rev, (void *)fpswa_iface->if_fpswa);
  301 
  302         /*
  303          * Set up buffers, so they can be used to read disk labels.
  304          */
  305         bufinit();
  306         vm_pager_bufferinit();
  307 
  308         /*
  309          * Traverse the MADT to discover IOSAPIC and Local SAPIC
  310          * information.
  311          */
  312         ia64_probe_sapics();
  313         ia64_pib = pmap_mapdev(ia64_lapic_addr, sizeof(*ia64_pib));
  314 
  315         ia64_mca_init();
  316 
  317         /*
  318          * Create sysctl tree for per-CPU information.
  319          */
  320         SLIST_FOREACH(pc, &cpuhead, pc_allcpu) {
  321                 snprintf(nodename, sizeof(nodename), "%u", pc->pc_cpuid);
  322                 sysctl_ctx_init(&pc->pc_md.sysctl_ctx);
  323                 pc->pc_md.sysctl_tree = SYSCTL_ADD_NODE(&pc->pc_md.sysctl_ctx,
  324                     SYSCTL_STATIC_CHILDREN(_machdep_cpu), OID_AUTO, nodename,
  325                     CTLFLAG_RD, NULL, "");
  326                 if (pc->pc_md.sysctl_tree == NULL)
  327                         continue;
  328 
  329                 pcs = &pc->pc_md.stats;
  330 
  331                 SYSCTL_ADD_ULONG(&pc->pc_md.sysctl_ctx,
  332                     SYSCTL_CHILDREN(pc->pc_md.sysctl_tree), OID_AUTO,
  333                     "nasts", CTLFLAG_RD, &pcs->pcs_nasts,
  334                     "Number of IPI_AST interrupts");
  335 
  336                 SYSCTL_ADD_ULONG(&pc->pc_md.sysctl_ctx,
  337                     SYSCTL_CHILDREN(pc->pc_md.sysctl_tree), OID_AUTO,
  338                     "nclks", CTLFLAG_RD, &pcs->pcs_nclks,
  339                     "Number of clock interrupts");
  340 
  341                 SYSCTL_ADD_ULONG(&pc->pc_md.sysctl_ctx,
  342                     SYSCTL_CHILDREN(pc->pc_md.sysctl_tree), OID_AUTO,
  343                     "nextints", CTLFLAG_RD, &pcs->pcs_nextints,
  344                     "Number of ExtINT interrupts");
  345 
  346                 SYSCTL_ADD_ULONG(&pc->pc_md.sysctl_ctx,
  347                     SYSCTL_CHILDREN(pc->pc_md.sysctl_tree), OID_AUTO,
  348                     "nhighfps", CTLFLAG_RD, &pcs->pcs_nhighfps,
  349                     "Number of IPI_HIGH_FP interrupts");
  350 
  351                 SYSCTL_ADD_ULONG(&pc->pc_md.sysctl_ctx,
  352                     SYSCTL_CHILDREN(pc->pc_md.sysctl_tree), OID_AUTO,
  353                     "nhwints", CTLFLAG_RD, &pcs->pcs_nhwints,
  354                     "Number of hardware (device) interrupts");
  355 
  356                 SYSCTL_ADD_ULONG(&pc->pc_md.sysctl_ctx,
  357                     SYSCTL_CHILDREN(pc->pc_md.sysctl_tree), OID_AUTO,
  358                     "npreempts", CTLFLAG_RD, &pcs->pcs_npreempts,
  359                     "Number of IPI_PREEMPT interrupts");
  360 
  361                 SYSCTL_ADD_ULONG(&pc->pc_md.sysctl_ctx,
  362                     SYSCTL_CHILDREN(pc->pc_md.sysctl_tree), OID_AUTO,
  363                     "nrdvs", CTLFLAG_RD, &pcs->pcs_nrdvs,
  364                     "Number of IPI_RENDEZVOUS interrupts");
  365 
  366                 SYSCTL_ADD_ULONG(&pc->pc_md.sysctl_ctx,
  367                     SYSCTL_CHILDREN(pc->pc_md.sysctl_tree), OID_AUTO,
  368                     "nstops", CTLFLAG_RD, &pcs->pcs_nstops,
  369                     "Number of IPI_STOP interrupts");
  370 
  371                 SYSCTL_ADD_ULONG(&pc->pc_md.sysctl_ctx,
  372                     SYSCTL_CHILDREN(pc->pc_md.sysctl_tree), OID_AUTO,
  373                     "nstrays", CTLFLAG_RD, &pcs->pcs_nstrays,
  374                     "Number of stray interrupts");
  375         }
  376 }
  377 SYSINIT(cpu_startup, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
  378 
  379 void
  380 cpu_flush_dcache(void *ptr, size_t len)
  381 {
  382         vm_offset_t lim, va;
  383 
  384         va = (uintptr_t)ptr & ~31;
  385         lim = (uintptr_t)ptr + len;
  386         while (va < lim) {
  387                 ia64_fc(va);
  388                 va += 32;
  389         }
  390 
  391         ia64_srlz_d();
  392 }
  393 
  394 /* Get current clock frequency for the given cpu id. */
  395 int
  396 cpu_est_clockrate(int cpu_id, uint64_t *rate)
  397 {
  398 
  399         if (pcpu_find(cpu_id) == NULL || rate == NULL)
  400                 return (EINVAL);
  401         *rate = (u_long)cpu_freq * 1000000ul;
  402         return (0);
  403 }
  404 
  405 void
  406 cpu_halt()
  407 {
  408 
  409         efi_reset_system();
  410 }
  411 
  412 void
  413 cpu_idle(int busy)
  414 {
  415         struct ia64_pal_result res;
  416 
  417         if (cpu_idle_hook != NULL)
  418                 (*cpu_idle_hook)();
  419         else
  420                 res = ia64_call_pal_static(PAL_HALT_LIGHT, 0, 0, 0);
  421 }
  422 
  423 int
  424 cpu_idle_wakeup(int cpu)
  425 {
  426 
  427         return (0);
  428 }
  429 
  430 void
  431 cpu_reset()
  432 {
  433 
  434         efi_reset_system();
  435 }
  436 
  437 void
  438 cpu_switch(struct thread *old, struct thread *new, struct mtx *mtx)
  439 {
  440         struct pcb *oldpcb, *newpcb;
  441 
  442         oldpcb = old->td_pcb;
  443 #ifdef COMPAT_FREEBSD32
  444         ia32_savectx(oldpcb);
  445 #endif
  446         if (PCPU_GET(fpcurthread) == old)
  447                 old->td_frame->tf_special.psr |= IA64_PSR_DFH;
  448         if (!savectx(oldpcb)) {
  449                 atomic_store_rel_ptr(&old->td_lock, mtx);
  450 
  451                 newpcb = new->td_pcb;
  452                 oldpcb->pcb_current_pmap =
  453                     pmap_switch(newpcb->pcb_current_pmap);
  454 
  455 #if defined(SCHED_ULE) && defined(SMP)
  456                 while (atomic_load_acq_ptr(&new->td_lock) == &blocked_lock)
  457                         cpu_spinwait();
  458 #endif
  459 
  460                 PCPU_SET(curthread, new);
  461 
  462 #ifdef COMPAT_FREEBSD32
  463                 ia32_restorectx(newpcb);
  464 #endif
  465 
  466                 if (PCPU_GET(fpcurthread) == new)
  467                         new->td_frame->tf_special.psr &= ~IA64_PSR_DFH;
  468                 restorectx(newpcb);
  469                 /* We should not get here. */
  470                 panic("cpu_switch: restorectx() returned");
  471                 /* NOTREACHED */
  472         }
  473 }
  474 
  475 void
  476 cpu_throw(struct thread *old __unused, struct thread *new)
  477 {
  478         struct pcb *newpcb;
  479 
  480         newpcb = new->td_pcb;
  481         (void)pmap_switch(newpcb->pcb_current_pmap);
  482 
  483 #if defined(SCHED_ULE) && defined(SMP)
  484         while (atomic_load_acq_ptr(&new->td_lock) == &blocked_lock)
  485                 cpu_spinwait();
  486 #endif
  487 
  488         PCPU_SET(curthread, new);
  489 
  490 #ifdef COMPAT_FREEBSD32
  491         ia32_restorectx(newpcb);
  492 #endif
  493 
  494         restorectx(newpcb);
  495         /* We should not get here. */
  496         panic("cpu_throw: restorectx() returned");
  497         /* NOTREACHED */
  498 }
  499 
  500 void
  501 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
  502 {
  503 
  504         /*
  505          * Set pc_acpi_id to "uninitialized".
  506          * See sys/dev/acpica/acpi_cpu.c
  507          */
  508         pcpu->pc_acpi_id = 0xffffffff;
  509 }
  510 
  511 void
  512 spinlock_enter(void)
  513 {
  514         struct thread *td;
  515 
  516         td = curthread;
  517         if (td->td_md.md_spinlock_count == 0)
  518                 td->td_md.md_saved_intr = intr_disable();
  519         td->td_md.md_spinlock_count++;
  520         critical_enter();
  521 }
  522 
  523 void
  524 spinlock_exit(void)
  525 {
  526         struct thread *td;
  527 
  528         td = curthread;
  529         critical_exit();
  530         td->td_md.md_spinlock_count--;
  531         if (td->td_md.md_spinlock_count == 0)
  532                 intr_restore(td->td_md.md_saved_intr);
  533 }
  534 
  535 void
  536 map_vhpt(uintptr_t vhpt)
  537 {
  538         pt_entry_t pte;
  539         uint64_t psr;
  540 
  541         pte = PTE_PRESENT | PTE_MA_WB | PTE_ACCESSED | PTE_DIRTY |
  542             PTE_PL_KERN | PTE_AR_RW;
  543         pte |= vhpt & PTE_PPN_MASK;
  544 
  545         __asm __volatile("ptr.d %0,%1" :: "r"(vhpt),
  546             "r"(IA64_ID_PAGE_SHIFT<<2));
  547 
  548         __asm __volatile("mov   %0=psr" : "=r"(psr));
  549         __asm __volatile("rsm   psr.ic|psr.i");
  550         ia64_srlz_i();
  551         ia64_set_ifa(vhpt);
  552         ia64_set_itir(IA64_ID_PAGE_SHIFT << 2);
  553         ia64_srlz_d();
  554         __asm __volatile("itr.d dtr[%0]=%1" :: "r"(2), "r"(pte));
  555         __asm __volatile("mov   psr.l=%0" :: "r" (psr));
  556         ia64_srlz_i();
  557 }
  558 
  559 void
  560 map_pal_code(void)
  561 {
  562         pt_entry_t pte;
  563         uint64_t psr;
  564 
  565         if (ia64_pal_base == 0)
  566                 return;
  567 
  568         pte = PTE_PRESENT | PTE_MA_WB | PTE_ACCESSED | PTE_DIRTY |
  569             PTE_PL_KERN | PTE_AR_RWX;
  570         pte |= ia64_pal_base & PTE_PPN_MASK;
  571 
  572         __asm __volatile("ptr.d %0,%1; ptr.i %0,%1" ::
  573             "r"(IA64_PHYS_TO_RR7(ia64_pal_base)), "r"(IA64_ID_PAGE_SHIFT<<2));
  574 
  575         __asm __volatile("mov   %0=psr" : "=r"(psr));
  576         __asm __volatile("rsm   psr.ic|psr.i");
  577         ia64_srlz_i();
  578         ia64_set_ifa(IA64_PHYS_TO_RR7(ia64_pal_base));
  579         ia64_set_itir(IA64_ID_PAGE_SHIFT << 2);
  580         ia64_srlz_d();
  581         __asm __volatile("itr.d dtr[%0]=%1" :: "r"(1), "r"(pte));
  582         ia64_srlz_d();
  583         __asm __volatile("itr.i itr[%0]=%1" :: "r"(1), "r"(pte));
  584         __asm __volatile("mov   psr.l=%0" :: "r" (psr));
  585         ia64_srlz_i();
  586 }
  587 
  588 void
  589 map_gateway_page(void)
  590 {
  591         pt_entry_t pte;
  592         uint64_t psr;
  593 
  594         pte = PTE_PRESENT | PTE_MA_WB | PTE_ACCESSED | PTE_DIRTY |
  595             PTE_PL_KERN | PTE_AR_X_RX;
  596         pte |= (uint64_t)ia64_gateway_page & PTE_PPN_MASK;
  597 
  598         __asm __volatile("ptr.d %0,%1; ptr.i %0,%1" ::
  599             "r"(VM_MAX_ADDRESS), "r"(PAGE_SHIFT << 2));
  600 
  601         __asm __volatile("mov   %0=psr" : "=r"(psr));
  602         __asm __volatile("rsm   psr.ic|psr.i");
  603         ia64_srlz_i();
  604         ia64_set_ifa(VM_MAX_ADDRESS);
  605         ia64_set_itir(PAGE_SHIFT << 2);
  606         ia64_srlz_d();
  607         __asm __volatile("itr.d dtr[%0]=%1" :: "r"(3), "r"(pte));
  608         ia64_srlz_d();
  609         __asm __volatile("itr.i itr[%0]=%1" :: "r"(3), "r"(pte));
  610         __asm __volatile("mov   psr.l=%0" :: "r" (psr));
  611         ia64_srlz_i();
  612 
  613         /* Expose the mapping to userland in ar.k5 */
  614         ia64_set_k5(VM_MAX_ADDRESS);
  615 }
  616 
  617 static u_int
  618 freq_ratio(u_long base, u_long ratio)
  619 {
  620         u_long f;
  621 
  622         f = (base * (ratio >> 32)) / (ratio & 0xfffffffful);
  623         return ((f + 500000) / 1000000);
  624 }
  625 
  626 static void
  627 calculate_frequencies(void)
  628 {
  629         struct ia64_sal_result sal;
  630         struct ia64_pal_result pal;
  631 
  632         sal = ia64_sal_entry(SAL_FREQ_BASE, 0, 0, 0, 0, 0, 0, 0);
  633         pal = ia64_call_pal_static(PAL_FREQ_RATIOS, 0, 0, 0);
  634 
  635         if (sal.sal_status == 0 && pal.pal_status == 0) {
  636                 if (bootverbose) {
  637                         printf("Platform clock frequency %ld Hz\n",
  638                                sal.sal_result[0]);
  639                         printf("Processor ratio %ld/%ld, Bus ratio %ld/%ld, "
  640                                "ITC ratio %ld/%ld\n",
  641                                pal.pal_result[0] >> 32,
  642                                pal.pal_result[0] & ((1L << 32) - 1),
  643                                pal.pal_result[1] >> 32,
  644                                pal.pal_result[1] & ((1L << 32) - 1),
  645                                pal.pal_result[2] >> 32,
  646                                pal.pal_result[2] & ((1L << 32) - 1));
  647                 }
  648                 cpu_freq = freq_ratio(sal.sal_result[0], pal.pal_result[0]);
  649                 bus_freq = freq_ratio(sal.sal_result[0], pal.pal_result[1]);
  650                 itc_freq = freq_ratio(sal.sal_result[0], pal.pal_result[2]);
  651         }
  652 }
  653 
  654 struct ia64_init_return
  655 ia64_init(void)
  656 {
  657         struct ia64_init_return ret;
  658         int phys_avail_cnt;
  659         vm_offset_t kernstart, kernend;
  660         vm_offset_t kernstartpfn, kernendpfn, pfn0, pfn1;
  661         char *p;
  662         struct efi_md *md;
  663         int metadata_missing;
  664 
  665         /* NO OUTPUT ALLOWED UNTIL FURTHER NOTICE */
  666 
  667         /*
  668          * TODO: Disable interrupts, floating point etc.
  669          * Maybe flush cache and tlb
  670          */
  671         ia64_set_fpsr(IA64_FPSR_DEFAULT);
  672 
  673         /*
  674          * TODO: Get critical system information (if possible, from the
  675          * information provided by the boot program).
  676          */
  677 
  678         /*
  679          * pa_bootinfo is the physical address of the bootinfo block as
  680          * passed to us by the loader and set in locore.s.
  681          */
  682         bootinfo = *(struct bootinfo *)(IA64_PHYS_TO_RR7(pa_bootinfo));
  683 
  684         if (bootinfo.bi_magic != BOOTINFO_MAGIC || bootinfo.bi_version != 1) {
  685                 bzero(&bootinfo, sizeof(bootinfo));
  686                 bootinfo.bi_kernend = (vm_offset_t) round_page(_end);
  687         }
  688 
  689         /*
  690          * Look for the I/O ports first - we need them for console
  691          * probing.
  692          */
  693         for (md = efi_md_first(); md != NULL; md = efi_md_next(md)) {
  694                 switch (md->md_type) {
  695                 case EFI_MD_TYPE_IOPORT:
  696                         ia64_port_base = (uintptr_t)pmap_mapdev(md->md_phys,
  697                             md->md_pages * EFI_PAGE_SIZE);
  698                         break;
  699                 case EFI_MD_TYPE_PALCODE:
  700                         ia64_pal_base = md->md_phys;
  701                         break;
  702                 }
  703         }
  704 
  705         metadata_missing = 0;
  706         if (bootinfo.bi_modulep)
  707                 preload_metadata = (caddr_t)bootinfo.bi_modulep;
  708         else
  709                 metadata_missing = 1;
  710 
  711         if (envmode == 0 && bootinfo.bi_envp)
  712                 kern_envp = (caddr_t)bootinfo.bi_envp;
  713         else
  714                 kern_envp = static_env;
  715 
  716         /*
  717          * Look at arguments passed to us and compute boothowto.
  718          */
  719         boothowto = bootinfo.bi_boothowto;
  720 
  721         if (boothowto & RB_VERBOSE)
  722                 bootverbose = 1;
  723 
  724         /*
  725          * Find the beginning and end of the kernel.
  726          */
  727         kernstart = trunc_page(kernel_text);
  728 #ifdef DDB
  729         ksym_start = bootinfo.bi_symtab;
  730         ksym_end = bootinfo.bi_esymtab;
  731         kernend = (vm_offset_t)round_page(ksym_end);
  732 #else
  733         kernend = (vm_offset_t)round_page(_end);
  734 #endif
  735         /* But if the bootstrap tells us otherwise, believe it! */
  736         if (bootinfo.bi_kernend)
  737                 kernend = round_page(bootinfo.bi_kernend);
  738 
  739         /*
  740          * Setup the PCPU data for the bootstrap processor. It is needed
  741          * by printf(). Also, since printf() has critical sections, we
  742          * need to initialize at least pc_curthread.
  743          */
  744         pcpup = &pcpu0;
  745         ia64_set_k4((u_int64_t)pcpup);
  746         pcpu_init(pcpup, 0, sizeof(pcpu0));
  747         dpcpu_init((void *)kernend, 0);
  748         kernend += DPCPU_SIZE;
  749         PCPU_SET(curthread, &thread0);
  750 
  751         /*
  752          * Initialize the console before we print anything out.
  753          */
  754         cninit();
  755 
  756         /* OUTPUT NOW ALLOWED */
  757 
  758         if (ia64_pal_base != 0) {
  759                 ia64_pal_base &= ~IA64_ID_PAGE_MASK;
  760                 /*
  761                  * We use a TR to map the first 256M of memory - this might
  762                  * cover the palcode too.
  763                  */
  764                 if (ia64_pal_base == 0)
  765                         printf("PAL code mapped by the kernel's TR\n");
  766         } else
  767                 printf("PAL code not found\n");
  768 
  769         /*
  770          * Wire things up so we can call the firmware.
  771          */
  772         map_pal_code();
  773         efi_boot_minimal(bootinfo.bi_systab);
  774         ia64_xiv_init();
  775         ia64_sal_init();
  776         calculate_frequencies();
  777 
  778         if (metadata_missing)
  779                 printf("WARNING: loader(8) metadata is missing!\n");
  780 
  781         /* Get FPSWA interface */
  782         fpswa_iface = (bootinfo.bi_fpswa == 0) ? NULL :
  783             (struct fpswa_iface *)IA64_PHYS_TO_RR7(bootinfo.bi_fpswa);
  784 
  785         /* Init basic tunables, including hz */
  786         init_param1();
  787 
  788         p = getenv("kernelname");
  789         if (p != NULL) {
  790                 strncpy(kernelname, p, sizeof(kernelname) - 1);
  791                 freeenv(p);
  792         }
  793 
  794         kernstartpfn = atop(IA64_RR_MASK(kernstart));
  795         kernendpfn = atop(IA64_RR_MASK(kernend));
  796 
  797         /*
  798          * Size the memory regions and load phys_avail[] with the results.
  799          */
  800 
  801         /*
  802          * Find out how much memory is available, by looking at
  803          * the memory descriptors.
  804          */
  805 
  806 #ifdef DEBUG_MD
  807         printf("Memory descriptor count: %d\n", mdcount);
  808 #endif
  809 
  810         phys_avail_cnt = 0;
  811         for (md = efi_md_first(); md != NULL; md = efi_md_next(md)) {
  812 #ifdef DEBUG_MD
  813                 printf("MD %p: type %d pa 0x%lx cnt 0x%lx\n", md,
  814                     md->md_type, md->md_phys, md->md_pages);
  815 #endif
  816 
  817                 pfn0 = ia64_btop(round_page(md->md_phys));
  818                 pfn1 = ia64_btop(trunc_page(md->md_phys + md->md_pages * 4096));
  819                 if (pfn1 <= pfn0)
  820                         continue;
  821 
  822                 if (md->md_type != EFI_MD_TYPE_FREE)
  823                         continue;
  824 
  825                 /*
  826                  * We have a memory descriptor that describes conventional
  827                  * memory that is for general use. We must determine if the
  828                  * loader has put the kernel in this region.
  829                  */
  830                 physmem += (pfn1 - pfn0);
  831                 if (pfn0 <= kernendpfn && kernstartpfn <= pfn1) {
  832                         /*
  833                          * Must compute the location of the kernel
  834                          * within the segment.
  835                          */
  836 #ifdef DEBUG_MD
  837                         printf("Descriptor %p contains kernel\n", mp);
  838 #endif
  839                         if (pfn0 < kernstartpfn) {
  840                                 /*
  841                                  * There is a chunk before the kernel.
  842                                  */
  843 #ifdef DEBUG_MD
  844                                 printf("Loading chunk before kernel: "
  845                                        "0x%lx / 0x%lx\n", pfn0, kernstartpfn);
  846 #endif
  847                                 phys_avail[phys_avail_cnt] = ia64_ptob(pfn0);
  848                                 phys_avail[phys_avail_cnt+1] = ia64_ptob(kernstartpfn);
  849                                 phys_avail_cnt += 2;
  850                         }
  851                         if (kernendpfn < pfn1) {
  852                                 /*
  853                                  * There is a chunk after the kernel.
  854                                  */
  855 #ifdef DEBUG_MD
  856                                 printf("Loading chunk after kernel: "
  857                                        "0x%lx / 0x%lx\n", kernendpfn, pfn1);
  858 #endif
  859                                 phys_avail[phys_avail_cnt] = ia64_ptob(kernendpfn);
  860                                 phys_avail[phys_avail_cnt+1] = ia64_ptob(pfn1);
  861                                 phys_avail_cnt += 2;
  862                         }
  863                 } else {
  864                         /*
  865                          * Just load this cluster as one chunk.
  866                          */
  867 #ifdef DEBUG_MD
  868                         printf("Loading descriptor %d: 0x%lx / 0x%lx\n", i,
  869                                pfn0, pfn1);
  870 #endif
  871                         phys_avail[phys_avail_cnt] = ia64_ptob(pfn0);
  872                         phys_avail[phys_avail_cnt+1] = ia64_ptob(pfn1);
  873                         phys_avail_cnt += 2;
  874                         
  875                 }
  876         }
  877         phys_avail[phys_avail_cnt] = 0;
  878 
  879         Maxmem = physmem;
  880         init_param2(physmem);
  881 
  882         /*
  883          * Initialize error message buffer (at end of core).
  884          */
  885         msgbufp = (struct msgbuf *)pmap_steal_memory(MSGBUF_SIZE);
  886         msgbufinit(msgbufp, MSGBUF_SIZE);
  887 
  888         proc_linkup0(&proc0, &thread0);
  889         /*
  890          * Init mapping for kernel stack for proc 0
  891          */
  892         thread0.td_kstack = pmap_steal_memory(KSTACK_PAGES * PAGE_SIZE);
  893         thread0.td_kstack_pages = KSTACK_PAGES;
  894 
  895         mutex_init();
  896 
  897         /*
  898          * Initialize the rest of proc 0's PCB.
  899          *
  900          * Set the kernel sp, reserving space for an (empty) trapframe,
  901          * and make proc0's trapframe pointer point to it for sanity.
  902          * Initialise proc0's backing store to start after u area.
  903          */
  904         cpu_thread_alloc(&thread0);
  905         thread0.td_frame->tf_flags = FRAME_SYSCALL;
  906         thread0.td_pcb->pcb_special.sp =
  907             (u_int64_t)thread0.td_frame - 16;
  908         thread0.td_pcb->pcb_special.bspstore = thread0.td_kstack;
  909 
  910         /*
  911          * Initialize the virtual memory system.
  912          */
  913         pmap_bootstrap();
  914 
  915         /*
  916          * Initialize debuggers, and break into them if appropriate.
  917          */
  918         kdb_init();
  919 
  920 #ifdef KDB
  921         if (boothowto & RB_KDB)
  922                 kdb_enter(KDB_WHY_BOOTFLAGS,
  923                     "Boot flags requested debugger\n");
  924 #endif
  925 
  926         ia64_set_tpr(0);
  927         ia64_srlz_d();
  928 
  929         ret.bspstore = thread0.td_pcb->pcb_special.bspstore;
  930         ret.sp = thread0.td_pcb->pcb_special.sp;
  931         return (ret);
  932 }
  933 
  934 uint64_t
  935 ia64_get_hcdp(void)
  936 {
  937 
  938         return (bootinfo.bi_hcdp);
  939 }
  940 
  941 void
  942 bzero(void *buf, size_t len)
  943 {
  944         caddr_t p = buf;
  945 
  946         while (((vm_offset_t) p & (sizeof(u_long) - 1)) && len) {
  947                 *p++ = 0;
  948                 len--;
  949         }
  950         while (len >= sizeof(u_long) * 8) {
  951                 *(u_long*) p = 0;
  952                 *((u_long*) p + 1) = 0;
  953                 *((u_long*) p + 2) = 0;
  954                 *((u_long*) p + 3) = 0;
  955                 len -= sizeof(u_long) * 8;
  956                 *((u_long*) p + 4) = 0;
  957                 *((u_long*) p + 5) = 0;
  958                 *((u_long*) p + 6) = 0;
  959                 *((u_long*) p + 7) = 0;
  960                 p += sizeof(u_long) * 8;
  961         }
  962         while (len >= sizeof(u_long)) {
  963                 *(u_long*) p = 0;
  964                 len -= sizeof(u_long);
  965                 p += sizeof(u_long);
  966         }
  967         while (len) {
  968                 *p++ = 0;
  969                 len--;
  970         }
  971 }
  972 
  973 u_int
  974 ia64_itc_freq(void)
  975 {
  976 
  977         return (itc_freq);
  978 }
  979 
  980 void
  981 DELAY(int n)
  982 {
  983         u_int64_t start, end, now;
  984 
  985         sched_pin();
  986 
  987         start = ia64_get_itc();
  988         end = start + itc_freq * n;
  989         /* printf("DELAY from 0x%lx to 0x%lx\n", start, end); */
  990         do {
  991                 now = ia64_get_itc();
  992         } while (now < end || (now > start && end < start));
  993 
  994         sched_unpin();
  995 }
  996 
  997 /*
  998  * Send an interrupt (signal) to a process.
  999  */
 1000 void
 1001 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
 1002 {
 1003         struct proc *p;
 1004         struct thread *td;
 1005         struct trapframe *tf;
 1006         struct sigacts *psp;
 1007         struct sigframe sf, *sfp;
 1008         u_int64_t sbs, sp;
 1009         int oonstack;
 1010         int sig;
 1011         u_long code;
 1012 
 1013         td = curthread;
 1014         p = td->td_proc;
 1015         PROC_LOCK_ASSERT(p, MA_OWNED);
 1016         sig = ksi->ksi_signo;
 1017         code = ksi->ksi_code;
 1018         psp = p->p_sigacts;
 1019         mtx_assert(&psp->ps_mtx, MA_OWNED);
 1020         tf = td->td_frame;
 1021         sp = tf->tf_special.sp;
 1022         oonstack = sigonstack(sp);
 1023         sbs = 0;
 1024 
 1025         /* save user context */
 1026         bzero(&sf, sizeof(struct sigframe));
 1027         sf.sf_uc.uc_sigmask = *mask;
 1028         sf.sf_uc.uc_stack = td->td_sigstk;
 1029         sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
 1030             ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
 1031 
 1032         /*
 1033          * Allocate and validate space for the signal handler
 1034          * context. Note that if the stack is in P0 space, the
 1035          * call to grow() is a nop, and the useracc() check
 1036          * will fail if the process has not already allocated
 1037          * the space with a `brk'.
 1038          */
 1039         if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
 1040             SIGISMEMBER(psp->ps_sigonstack, sig)) {
 1041                 sbs = (u_int64_t)td->td_sigstk.ss_sp;
 1042                 sbs = (sbs + 15) & ~15;
 1043                 sfp = (struct sigframe *)(sbs + td->td_sigstk.ss_size);
 1044 #if defined(COMPAT_43)
 1045                 td->td_sigstk.ss_flags |= SS_ONSTACK;
 1046 #endif
 1047         } else
 1048                 sfp = (struct sigframe *)sp;
 1049         sfp = (struct sigframe *)((u_int64_t)(sfp - 1) & ~15);
 1050 
 1051         /* Fill in the siginfo structure for POSIX handlers. */
 1052         if (SIGISMEMBER(psp->ps_siginfo, sig)) {
 1053                 sf.sf_si = ksi->ksi_info;
 1054                 sf.sf_si.si_signo = sig;
 1055                 /*
 1056                  * XXX this shouldn't be here after code in trap.c
 1057                  * is fixed
 1058                  */
 1059                 sf.sf_si.si_addr = (void*)tf->tf_special.ifa;
 1060                 code = (u_int64_t)&sfp->sf_si;
 1061         }
 1062 
 1063         mtx_unlock(&psp->ps_mtx);
 1064         PROC_UNLOCK(p);
 1065 
 1066         get_mcontext(td, &sf.sf_uc.uc_mcontext, 0);
 1067 
 1068         /* Copy the frame out to userland. */
 1069         if (copyout(&sf, sfp, sizeof(sf)) != 0) {
 1070                 /*
 1071                  * Process has trashed its stack; give it an illegal
 1072                  * instruction to halt it in its tracks.
 1073                  */
 1074                 PROC_LOCK(p);
 1075                 sigexit(td, SIGILL);
 1076                 return;
 1077         }
 1078 
 1079         if ((tf->tf_flags & FRAME_SYSCALL) == 0) {
 1080                 tf->tf_special.psr &= ~IA64_PSR_RI;
 1081                 tf->tf_special.iip = ia64_get_k5() +
 1082                     ((uint64_t)break_sigtramp - (uint64_t)ia64_gateway_page);
 1083         } else
 1084                 tf->tf_special.iip = ia64_get_k5() +
 1085                     ((uint64_t)epc_sigtramp - (uint64_t)ia64_gateway_page);
 1086 
 1087         /*
 1088          * Setup the trapframe to return to the signal trampoline. We pass
 1089          * information to the trampoline in the following registers:
 1090          *
 1091          *      gp      new backing store or NULL
 1092          *      r8      signal number
 1093          *      r9      signal code or siginfo pointer
 1094          *      r10     signal handler (function descriptor)
 1095          */
 1096         tf->tf_special.sp = (u_int64_t)sfp - 16;
 1097         tf->tf_special.gp = sbs;
 1098         tf->tf_special.bspstore = sf.sf_uc.uc_mcontext.mc_special.bspstore;
 1099         tf->tf_special.ndirty = 0;
 1100         tf->tf_special.rnat = sf.sf_uc.uc_mcontext.mc_special.rnat;
 1101         tf->tf_scratch.gr8 = sig;
 1102         tf->tf_scratch.gr9 = code;
 1103         tf->tf_scratch.gr10 = (u_int64_t)catcher;
 1104 
 1105         PROC_LOCK(p);
 1106         mtx_lock(&psp->ps_mtx);
 1107 }
 1108 
 1109 /*
 1110  * System call to cleanup state after a signal
 1111  * has been taken.  Reset signal mask and
 1112  * stack state from context left by sendsig (above).
 1113  * Return to previous pc and psl as specified by
 1114  * context left by sendsig. Check carefully to
 1115  * make sure that the user has not modified the
 1116  * state to gain improper privileges.
 1117  *
 1118  * MPSAFE
 1119  */
 1120 int
 1121 sigreturn(struct thread *td,
 1122         struct sigreturn_args /* {
 1123                 ucontext_t *sigcntxp;
 1124         } */ *uap)
 1125 {
 1126         ucontext_t uc;
 1127         struct trapframe *tf;
 1128         struct pcb *pcb;
 1129 
 1130         tf = td->td_frame;
 1131         pcb = td->td_pcb;
 1132 
 1133         /*
 1134          * Fetch the entire context structure at once for speed.
 1135          * We don't use a normal argument to simplify RSE handling.
 1136          */
 1137         if (copyin(uap->sigcntxp, (caddr_t)&uc, sizeof(uc)))
 1138                 return (EFAULT);
 1139 
 1140         set_mcontext(td, &uc.uc_mcontext);
 1141 
 1142 #if defined(COMPAT_43)
 1143         if (sigonstack(tf->tf_special.sp))
 1144                 td->td_sigstk.ss_flags |= SS_ONSTACK;
 1145         else
 1146                 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
 1147 #endif
 1148         kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
 1149 
 1150         return (EJUSTRETURN);
 1151 }
 1152 
 1153 #ifdef COMPAT_FREEBSD4
 1154 int
 1155 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
 1156 {
 1157 
 1158         return sigreturn(td, (struct sigreturn_args *)uap);
 1159 }
 1160 #endif
 1161 
 1162 /*
 1163  * Construct a PCB from a trapframe. This is called from kdb_trap() where
 1164  * we want to start a backtrace from the function that caused us to enter
 1165  * the debugger. We have the context in the trapframe, but base the trace
 1166  * on the PCB. The PCB doesn't have to be perfect, as long as it contains
 1167  * enough for a backtrace.
 1168  */
 1169 void
 1170 makectx(struct trapframe *tf, struct pcb *pcb)
 1171 {
 1172 
 1173         pcb->pcb_special = tf->tf_special;
 1174         pcb->pcb_special.__spare = ~0UL;        /* XXX see unwind.c */
 1175         save_callee_saved(&pcb->pcb_preserved);
 1176         save_callee_saved_fp(&pcb->pcb_preserved_fp);
 1177 }
 1178 
 1179 int
 1180 ia64_flush_dirty(struct thread *td, struct _special *r)
 1181 {
 1182         struct iovec iov;
 1183         struct uio uio;
 1184         uint64_t bspst, kstk, rnat;
 1185         int error, locked;
 1186 
 1187         if (r->ndirty == 0)
 1188                 return (0);
 1189 
 1190         kstk = td->td_kstack + (r->bspstore & 0x1ffUL);
 1191         if (td == curthread) {
 1192                 __asm __volatile("mov   ar.rsc=0;;");
 1193                 __asm __volatile("mov   %0=ar.bspstore" : "=r"(bspst));
 1194                 /* Make sure we have all the user registers written out. */
 1195                 if (bspst - kstk < r->ndirty) {
 1196                         __asm __volatile("flushrs;;");
 1197                         __asm __volatile("mov   %0=ar.bspstore" : "=r"(bspst));
 1198                 }
 1199                 __asm __volatile("mov   %0=ar.rnat;;" : "=r"(rnat));
 1200                 __asm __volatile("mov   ar.rsc=3");
 1201                 error = copyout((void*)kstk, (void*)r->bspstore, r->ndirty);
 1202                 kstk += r->ndirty;
 1203                 r->rnat = (bspst > kstk && (bspst & 0x1ffL) < (kstk & 0x1ffL))
 1204                     ? *(uint64_t*)(kstk | 0x1f8L) : rnat;
 1205         } else {
 1206                 locked = PROC_LOCKED(td->td_proc);
 1207                 if (!locked)
 1208                         PHOLD(td->td_proc);
 1209                 iov.iov_base = (void*)(uintptr_t)kstk;
 1210                 iov.iov_len = r->ndirty;
 1211                 uio.uio_iov = &iov;
 1212                 uio.uio_iovcnt = 1;
 1213                 uio.uio_offset = r->bspstore;
 1214                 uio.uio_resid = r->ndirty;
 1215                 uio.uio_segflg = UIO_SYSSPACE;
 1216                 uio.uio_rw = UIO_WRITE;
 1217                 uio.uio_td = td;
 1218                 error = proc_rwmem(td->td_proc, &uio);
 1219                 /*
 1220                  * XXX proc_rwmem() doesn't currently return ENOSPC,
 1221                  * so I think it can bogusly return 0. Neither do
 1222                  * we allow short writes.
 1223                  */
 1224                 if (uio.uio_resid != 0 && error == 0)
 1225                         error = ENOSPC;
 1226                 if (!locked)
 1227                         PRELE(td->td_proc);
 1228         }
 1229 
 1230         r->bspstore += r->ndirty;
 1231         r->ndirty = 0;
 1232         return (error);
 1233 }
 1234 
 1235 int
 1236 get_mcontext(struct thread *td, mcontext_t *mc, int flags)
 1237 {
 1238         struct trapframe *tf;
 1239         int error;
 1240 
 1241         tf = td->td_frame;
 1242         bzero(mc, sizeof(*mc));
 1243         mc->mc_special = tf->tf_special;
 1244         error = ia64_flush_dirty(td, &mc->mc_special);
 1245         if (tf->tf_flags & FRAME_SYSCALL) {
 1246                 mc->mc_flags |= _MC_FLAGS_SYSCALL_CONTEXT;
 1247                 mc->mc_scratch = tf->tf_scratch;
 1248                 if (flags & GET_MC_CLEAR_RET) {
 1249                         mc->mc_scratch.gr8 = 0;
 1250                         mc->mc_scratch.gr9 = 0;
 1251                         mc->mc_scratch.gr10 = 0;
 1252                         mc->mc_scratch.gr11 = 0;
 1253                 }
 1254         } else {
 1255                 mc->mc_flags |= _MC_FLAGS_ASYNC_CONTEXT;
 1256                 mc->mc_scratch = tf->tf_scratch;
 1257                 mc->mc_scratch_fp = tf->tf_scratch_fp;
 1258                 /*
 1259                  * XXX If the thread never used the high FP registers, we
 1260                  * probably shouldn't waste time saving them.
 1261                  */
 1262                 ia64_highfp_save(td);
 1263                 mc->mc_flags |= _MC_FLAGS_HIGHFP_VALID;
 1264                 mc->mc_high_fp = td->td_pcb->pcb_high_fp;
 1265         }
 1266         save_callee_saved(&mc->mc_preserved);
 1267         save_callee_saved_fp(&mc->mc_preserved_fp);
 1268         return (error);
 1269 }
 1270 
 1271 int
 1272 set_mcontext(struct thread *td, const mcontext_t *mc)
 1273 {
 1274         struct _special s;
 1275         struct trapframe *tf;
 1276         uint64_t psrmask;
 1277 
 1278         tf = td->td_frame;
 1279 
 1280         KASSERT((tf->tf_special.ndirty & ~PAGE_MASK) == 0,
 1281             ("Whoa there! We have more than 8KB of dirty registers!"));
 1282 
 1283         s = mc->mc_special;
 1284         /*
 1285          * Only copy the user mask and the restart instruction bit from
 1286          * the new context.
 1287          */
 1288         psrmask = IA64_PSR_BE | IA64_PSR_UP | IA64_PSR_AC | IA64_PSR_MFL |
 1289             IA64_PSR_MFH | IA64_PSR_RI;
 1290         s.psr = (tf->tf_special.psr & ~psrmask) | (s.psr & psrmask);
 1291         /* We don't have any dirty registers of the new context. */
 1292         s.ndirty = 0;
 1293         if (mc->mc_flags & _MC_FLAGS_ASYNC_CONTEXT) {
 1294                 /*
 1295                  * We can get an async context passed to us while we
 1296                  * entered the kernel through a syscall: sigreturn(2)
 1297                  * takes contexts that could previously be the result of
 1298                  * a trap or interrupt.
 1299                  * Hence, we cannot assert that the trapframe is not
 1300                  * a syscall frame, but we can assert that it's at
 1301                  * least an expected syscall.
 1302                  */
 1303                 if (tf->tf_flags & FRAME_SYSCALL) {
 1304                         KASSERT(tf->tf_scratch.gr15 == SYS_sigreturn, ("foo"));
 1305                         tf->tf_flags &= ~FRAME_SYSCALL;
 1306                 }
 1307                 tf->tf_scratch = mc->mc_scratch;
 1308                 tf->tf_scratch_fp = mc->mc_scratch_fp;
 1309                 if (mc->mc_flags & _MC_FLAGS_HIGHFP_VALID)
 1310                         td->td_pcb->pcb_high_fp = mc->mc_high_fp;
 1311         } else {
 1312                 KASSERT((tf->tf_flags & FRAME_SYSCALL) != 0, ("foo"));
 1313                 if ((mc->mc_flags & _MC_FLAGS_SYSCALL_CONTEXT) == 0) {
 1314                         s.cfm = tf->tf_special.cfm;
 1315                         s.iip = tf->tf_special.iip;
 1316                         tf->tf_scratch.gr15 = 0;        /* Clear syscall nr. */
 1317                 } else
 1318                         tf->tf_scratch = mc->mc_scratch;
 1319         }
 1320         tf->tf_special = s;
 1321         restore_callee_saved(&mc->mc_preserved);
 1322         restore_callee_saved_fp(&mc->mc_preserved_fp);
 1323 
 1324         return (0);
 1325 }
 1326 
 1327 /*
 1328  * Clear registers on exec.
 1329  */
 1330 void
 1331 exec_setregs(struct thread *td, u_long entry, u_long stack, u_long ps_strings)
 1332 {
 1333         struct trapframe *tf;
 1334         uint64_t *ksttop, *kst;
 1335 
 1336         tf = td->td_frame;
 1337         ksttop = (uint64_t*)(td->td_kstack + tf->tf_special.ndirty +
 1338             (tf->tf_special.bspstore & 0x1ffUL));
 1339 
 1340         /*
 1341          * We can ignore up to 8KB of dirty registers by masking off the
 1342          * lower 13 bits in exception_restore() or epc_syscall(). This
 1343          * should be enough for a couple of years, but if there are more
 1344          * than 8KB of dirty registers, we lose track of the bottom of
 1345          * the kernel stack. The solution is to copy the active part of
 1346          * the kernel stack down 1 page (or 2, but not more than that)
 1347          * so that we always have less than 8KB of dirty registers.
 1348          */
 1349         KASSERT((tf->tf_special.ndirty & ~PAGE_MASK) == 0,
 1350             ("Whoa there! We have more than 8KB of dirty registers!"));
 1351 
 1352         bzero(&tf->tf_special, sizeof(tf->tf_special));
 1353         if ((tf->tf_flags & FRAME_SYSCALL) == 0) {      /* break syscalls. */
 1354                 bzero(&tf->tf_scratch, sizeof(tf->tf_scratch));
 1355                 bzero(&tf->tf_scratch_fp, sizeof(tf->tf_scratch_fp));
 1356                 tf->tf_special.cfm = (1UL<<63) | (3UL<<7) | 3UL;
 1357                 tf->tf_special.bspstore = IA64_BACKINGSTORE;
 1358                 /*
 1359                  * Copy the arguments onto the kernel register stack so that
 1360                  * they get loaded by the loadrs instruction. Skip over the
 1361                  * NaT collection points.
 1362                  */
 1363                 kst = ksttop - 1;
 1364                 if (((uintptr_t)kst & 0x1ff) == 0x1f8)
 1365                         *kst-- = 0;
 1366                 *kst-- = 0;
 1367                 if (((uintptr_t)kst & 0x1ff) == 0x1f8)
 1368                         *kst-- = 0;
 1369                 *kst-- = ps_strings;
 1370                 if (((uintptr_t)kst & 0x1ff) == 0x1f8)
 1371                         *kst-- = 0;
 1372                 *kst = stack;
 1373                 tf->tf_special.ndirty = (ksttop - kst) << 3;
 1374         } else {                                /* epc syscalls (default). */
 1375                 tf->tf_special.cfm = (3UL<<62) | (3UL<<7) | 3UL;
 1376                 tf->tf_special.bspstore = IA64_BACKINGSTORE + 24;
 1377                 /*
 1378                  * Write values for out0, out1 and out2 to the user's backing
 1379                  * store and arrange for them to be restored into the user's
 1380                  * initial register frame.
 1381                  * Assumes that (bspstore & 0x1f8) < 0x1e0.
 1382                  */
 1383                 suword((caddr_t)tf->tf_special.bspstore - 24, stack);
 1384                 suword((caddr_t)tf->tf_special.bspstore - 16, ps_strings);
 1385                 suword((caddr_t)tf->tf_special.bspstore -  8, 0);
 1386         }
 1387 
 1388         tf->tf_special.iip = entry;
 1389         tf->tf_special.sp = (stack & ~15) - 16;
 1390         tf->tf_special.rsc = 0xf;
 1391         tf->tf_special.fpsr = IA64_FPSR_DEFAULT;
 1392         tf->tf_special.psr = IA64_PSR_IC | IA64_PSR_I | IA64_PSR_IT |
 1393             IA64_PSR_DT | IA64_PSR_RT | IA64_PSR_DFH | IA64_PSR_BN |
 1394             IA64_PSR_CPL_USER;
 1395 }
 1396 
 1397 int
 1398 ptrace_set_pc(struct thread *td, unsigned long addr)
 1399 {
 1400         uint64_t slot;
 1401 
 1402         switch (addr & 0xFUL) {
 1403         case 0:
 1404                 slot = IA64_PSR_RI_0;
 1405                 break;
 1406         case 1:
 1407                 /* XXX we need to deal with MLX bundles here */
 1408                 slot = IA64_PSR_RI_1;
 1409                 break;
 1410         case 2:
 1411                 slot = IA64_PSR_RI_2;
 1412                 break;
 1413         default:
 1414                 return (EINVAL);
 1415         }
 1416 
 1417         td->td_frame->tf_special.iip = addr & ~0x0FULL;
 1418         td->td_frame->tf_special.psr =
 1419             (td->td_frame->tf_special.psr & ~IA64_PSR_RI) | slot;
 1420         return (0);
 1421 }
 1422 
 1423 int
 1424 ptrace_single_step(struct thread *td)
 1425 {
 1426         struct trapframe *tf;
 1427 
 1428         /*
 1429          * There's no way to set single stepping when we're leaving the
 1430          * kernel through the EPC syscall path. The way we solve this is
 1431          * by enabling the lower-privilege trap so that we re-enter the
 1432          * kernel as soon as the privilege level changes. See trap.c for
 1433          * how we proceed from there.
 1434          */
 1435         tf = td->td_frame;
 1436         if (tf->tf_flags & FRAME_SYSCALL)
 1437                 tf->tf_special.psr |= IA64_PSR_LP;
 1438         else
 1439                 tf->tf_special.psr |= IA64_PSR_SS;
 1440         return (0);
 1441 }
 1442 
 1443 int
 1444 ptrace_clear_single_step(struct thread *td)
 1445 {
 1446         struct trapframe *tf;
 1447 
 1448         /*
 1449          * Clear any and all status bits we may use to implement single
 1450          * stepping.
 1451          */
 1452         tf = td->td_frame;
 1453         tf->tf_special.psr &= ~IA64_PSR_SS;
 1454         tf->tf_special.psr &= ~IA64_PSR_LP;
 1455         tf->tf_special.psr &= ~IA64_PSR_TB;
 1456         return (0);
 1457 }
 1458 
 1459 int
 1460 fill_regs(struct thread *td, struct reg *regs)
 1461 {
 1462         struct trapframe *tf;
 1463 
 1464         tf = td->td_frame;
 1465         regs->r_special = tf->tf_special;
 1466         regs->r_scratch = tf->tf_scratch;
 1467         save_callee_saved(&regs->r_preserved);
 1468         return (0);
 1469 }
 1470 
 1471 int
 1472 set_regs(struct thread *td, struct reg *regs)
 1473 {
 1474         struct trapframe *tf;
 1475         int error;
 1476 
 1477         tf = td->td_frame;
 1478         error = ia64_flush_dirty(td, &tf->tf_special);
 1479         if (!error) {
 1480                 tf->tf_special = regs->r_special;
 1481                 tf->tf_special.bspstore += tf->tf_special.ndirty;
 1482                 tf->tf_special.ndirty = 0;
 1483                 tf->tf_scratch = regs->r_scratch;
 1484                 restore_callee_saved(&regs->r_preserved);
 1485         }
 1486         return (error);
 1487 }
 1488 
 1489 int
 1490 fill_dbregs(struct thread *td, struct dbreg *dbregs)
 1491 {
 1492 
 1493         return (ENOSYS);
 1494 }
 1495 
 1496 int
 1497 set_dbregs(struct thread *td, struct dbreg *dbregs)
 1498 {
 1499 
 1500         return (ENOSYS);
 1501 }
 1502 
 1503 int
 1504 fill_fpregs(struct thread *td, struct fpreg *fpregs)
 1505 {
 1506         struct trapframe *frame = td->td_frame;
 1507         struct pcb *pcb = td->td_pcb;
 1508 
 1509         /* Save the high FP registers. */
 1510         ia64_highfp_save(td);
 1511 
 1512         fpregs->fpr_scratch = frame->tf_scratch_fp;
 1513         save_callee_saved_fp(&fpregs->fpr_preserved);
 1514         fpregs->fpr_high = pcb->pcb_high_fp;
 1515         return (0);
 1516 }
 1517 
 1518 int
 1519 set_fpregs(struct thread *td, struct fpreg *fpregs)
 1520 {
 1521         struct trapframe *frame = td->td_frame;
 1522         struct pcb *pcb = td->td_pcb;
 1523 
 1524         /* Throw away the high FP registers (should be redundant). */
 1525         ia64_highfp_drop(td);
 1526 
 1527         frame->tf_scratch_fp = fpregs->fpr_scratch;
 1528         restore_callee_saved_fp(&fpregs->fpr_preserved);
 1529         pcb->pcb_high_fp = fpregs->fpr_high;
 1530         return (0);
 1531 }
 1532 
 1533 void
 1534 ia64_sync_icache(vm_offset_t va, vm_offset_t sz)
 1535 {
 1536         vm_offset_t lim;
 1537 
 1538         if (!ia64_sync_icache_needed)
 1539                 return;
 1540 
 1541         lim = va + sz;
 1542         while (va < lim) {
 1543                 ia64_fc_i(va);
 1544                 va += 32;       /* XXX */
 1545         }
 1546 
 1547         ia64_sync_i();
 1548         ia64_srlz_i();
 1549 }

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