rom/exec/exec_init.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: exec.library resident and initialization.
   6     Lang: english
   7 */
   8
   9 #include <exec/lists.h>
  10 #include <exec/execbase.h>
  11 #include <exec/interrupts.h>
  12 #include <exec/resident.h>
  13 #include <exec/memory.h>
  14 #include <exec/alerts.h>
  15 #include <exec/tasks.h>
  16 #include <hardware/intbits.h>
  17
  18 #include <aros/symbolsets.h>
  19 #include <aros/system.h>
  20 #include <aros/arossupportbase.h>
  21 #include <aros/asmcall.h>
  22 #include <aros/config.h>
  23
  24 #include <aros/debug.h>
  25
  26 #include <proto/arossupport.h>
  27 #include <proto/exec.h>
  28 #include <proto/kernel.h>
  29
  30 #include "exec_debug.h"
  31 #include "exec_intern.h"
  32 #include "exec_util.h"
  33 #include "etask.h"
  34 #include "intservers.h"
  35 #include "memory.h"
  36 #include "taskstorage.h"
  37
  38 #include LC_LIBDEFS_FILE
  39
  40 static const UBYTE name[];
  41 static const UBYTE version[];
  42
  43 /* This comes from genmodule */
  44 extern const char LIBEND;
  45
  46 AROS_UFP3S(struct ExecBase *, GM_UNIQUENAME(init),
  47     AROS_UFPA(struct MemHeader *, mh, D0),
  48     AROS_UFPA(struct TagItem *, tagList, A0),
  49     AROS_UFPA(struct ExecBase *, sysBase, A6));
  50
  51 /*
  52  * exec.library ROMTag.
  53  *
  54  * It has RTF_COLDSTART level specified, however it actually runs at SINGLETASK
  55  * (no multitasking, incomplete boot task).
  56  * This is supposed to be the first COLDSTART resident to be executed. Its job is
  57  * to complete the boot task and enable multitasking (which actually means entering
  58  * COLDSTART level).
  59  * Such mechanism allows kernel.resource boot code to do some additional setup after
  60  * all SINGLETASK residents are run. Usually these are various lowlevel hardware resources
  61  * (like acpi.resource, efi.resource, etc) which can be needed for kernel.resource to
  62  * complete own setup. This helps to get rid of additional ROMTag hooks.
  63  * There's one more magic with this ROMTag: it's called twice. First time it's called manually
  64  * from within krnPrepareExecBase(), for initial ExecBase creation. This magic is described below.
  65  *
  66  * WARNING: the CPU privilege level must be set to user before calling InitCode(RTF_COLDSTART)!
  67  */
  68 const struct Resident Exec_resident =
  69 {
  70     RTC_MATCHWORD,
  71     (struct Resident *)&Exec_resident,
  72     (APTR)&LIBEND,
  73     RTF_COLDSTART,
  74     VERSION_NUMBER,
  75     NT_LIBRARY,
  76     120,
  77     (STRPTR)name,
  78     (STRPTR)&version[6],
  79     &GM_UNIQUENAME(init),
  80 };
  81
  82 static const UBYTE name[] = MOD_NAME_STRING;
  83 static const UBYTE version[] = VERSION_STRING;
  84
  85 extern void debugmem(void);
  86
  87 THIS_PROGRAM_HANDLES_SYMBOLSETS
  88 DEFINESET(INITLIB)
  89 DEFINESET(PREINITLIB)
  90
  91 AROS_UFH3S(struct ExecBase *, GM_UNIQUENAME(init),
  92     AROS_UFHA(struct MemHeader *, mh, D0),
  93     AROS_UFHA(struct TagItem *, tagList, A0),
  94     AROS_UFHA(struct ExecBase *, origSysBase, A6)
  95 )
  96 {
  97     AROS_USERFUNC_INIT
  98
  99     struct TaskStorageFreeSlot *tsfs;
 100     struct Task *t;
 101     struct MemList *ml;
 102     struct ExceptionContext *ctx;
 103     int i;
 104
 105     /*
 106      * exec.library init routine is a little bit magic. The magic is that it
 107      * can be run twice.
 108      * First time it's run manually from kernel.resource's ROMTag scanner in order
 109      * to create initial ExecBase. This condition is determined by origSysBase == NULL
 110      * passed to this function. In this case the routine expects two more arguments:
 111      * mh      - an initial MemHeader in which ExecBase will be constructed.
 112      * tagList - boot information passed from the bootstrap. It is used to parse
 113      *           certain command-line arguments.
 114      *
 115      * Second time it's run as part of normal modules initialization sequence, at the
 116      * end of all RTS_SINGLETASK modules. At this moment we already have a complete
 117      * memory list and working kernel.resource. Now the job is to complete the boot task
 118      * structure, and start up multitasking.
 119      */
 120     if (!origSysBase)
 121         return PrepareExecBase(mh, tagList);
 122
 123     DINIT("exec.library init");
 124
 125     /*
 126      * Call platform-specific pre-init code (if any). Return values are not checked.
 127      * Note that Boot Task is still incomplete here, and there's no multitasking yet.
 128      *
 129      * TODO: Amiga(tm) port may call PrepareExecBaseMove() here instead of hardlinking
 130      * it from within the boot code.
 131      *
 132      * NOTE: All functions will be passed origSysBase value. This is the original
 133      * ExecBase pointer in case if it was moved. The new pointer will be in global
 134      * SysBase then.
 135      */
 136     set_call_libfuncs(SETNAME(PREINITLIB), 1, 0, origSysBase);
 137
 138     /*
 139      * kernel.resource is up and running and memory list is complete.
 140      * Global SysBase is set to its final value. We've got KernelBase and AllocMem() works.
 141      * Initialize free task storage slots management
 142      */
 143     tsfs = AllocMem(sizeof(struct TaskStorageFreeSlot), MEMF_PUBLIC|MEMF_CLEAR);
 144     if (!tsfs)
 145     {
 146         DINIT("ERROR: Could not allocate free slot node!");
 147         return NULL;
 148     }
 149     tsfs->FreeSlot = 1;
 150     AddHead((struct List *)&PrivExecBase(SysBase)->TaskStorageSlots, (struct Node *)tsfs);
 151
 152     /* Now we are ready to become a Boot Task and turn on the multitasking */
 153     t   = AllocMem(sizeof(struct Task),    MEMF_PUBLIC|MEMF_CLEAR);
 154     ml  = AllocMem(sizeof(struct MemList), MEMF_PUBLIC|MEMF_CLEAR);
 155     ctx = KrnCreateContext();
 156
 157     D(bug("[exec] Boot Task 0x%p, ETask 0x%p, CPU context 0x%p\n", t, t->tc_UnionETask.tc_ETask, ctx));
 158
 159     if (!t || !ml || !ctx)
 160     {
 161         DINIT("Not enough memory for first task");
 162         return NULL;
 163     }
 164
 165     NEWLIST(&t->tc_MemEntry);
 166
 167     t->tc_Node.ln_Name = "Boot Task";
 168     t->tc_Node.ln_Type = NT_TASK;
 169     t->tc_Node.ln_Pri  = 0;
 170     t->tc_State        = TS_RUN;
 171     t->tc_SigAlloc     = 0xFFFF;
 172
 173     /*
 174      * Boot-time stack can be placed anywhere in memory.
 175      * In order to avoid complex platform-dependent mechanism for querying its limits
 176      * we simply shut up stack checking in kernel.resource by specifying the whole address
 177      * space as limits.
 178      */
 179     t->tc_SPLower      = NULL;
 180     t->tc_SPUpper      = (APTR)~0;
 181
 182     /*
 183      * Build a memory list for the task.
 184      * It doesn't include stack because it wasn't allocated by us.
 185      */
 186     ml->ml_NumEntries      = 1;
 187     ml->ml_ME[0].me_Addr   = t;
 188     ml->ml_ME[0].me_Length = sizeof(struct Task);
 189     AddHead(&t->tc_MemEntry, &ml->ml_Node);
 190
 191     /* Create a ETask structure and attach CPU context */
 192     InitETask(t);
 193     if (!t->tc_UnionETask.tc_ETask)
 194     {
 195         DINIT("Not enough memory for first task");
 196         return NULL;
 197     }
 198     GetIntETask(t)->iet_Context = ctx;
 199
 200     /*
 201      * Set the current task and elapsed time for it.
 202      * Set ThisTask only AFTER InitETask() has been called. InitETask() sets et_Parent
 203      * to FindTask(NULL). We must get NULL there, otherwise we'll get task looped on itself.
 204      */
 205     SysBase->ThisTask = t;
 206     SysBase->Elapsed  = SysBase->Quantum;
 207
 208     /* Install the interrupt servers. Again, do it here because allocations are needed. */
 209     for (i=0; i < 16; i++)
 210     {
 211         struct Interrupt *is;
 212
 213         if (i != INTB_SOFTINT)
 214         {
 215             struct SoftIntList *sil;
 216
 217             is = AllocMem(sizeof(struct Interrupt) + sizeof(struct SoftIntList), MEMF_CLEAR|MEMF_PUBLIC);
 218             if (is == NULL)
 219             {
 220                 DINIT("ERROR: Cannot install Interrupt Servers!");
 221                 Alert( AT_DeadEnd | AN_IntrMem );
 222             }
 223
 224             sil = (struct SoftIntList *)((struct Interrupt *)is + 1);
 225
 226             if (i == INTB_VERTB)
 227                 is->is_Code = &VBlankServer;
 228             else
 229                 is->is_Code = &IntServer;
 230             is->is_Data = sil;
 231             NEWLIST((struct List *)sil);
 232             SetIntVector(i,is);
 233         }
 234         else
 235         {
 236             struct Interrupt * is;
 237
 238             is = AllocMem(sizeof(struct Interrupt), MEMF_CLEAR|MEMF_PUBLIC);
 239             if (NULL == is)
 240             {
 241                 DINIT("Error: Cannot install SoftInt Handler!\n");
 242                 Alert( AT_DeadEnd | AN_IntrMem );
 243             }
 244
 245             is->is_Node.ln_Type = NT_INTERRUPT;
 246             is->is_Node.ln_Pri = 0;
 247             is->is_Node.ln_Name = "SW Interrupt Dispatcher";
 248             is->is_Data = NULL;
 249             is->is_Code = (void *)SoftIntDispatch;
 250             SetIntVector(i,is);
 251         }
 252     }
 253
 254     /* We now start up the interrupts */
 255     Permit();
 256     Enable();
 257
 258     D(debugmem());
 259
 260     /* Call platform-specific init code (if any) */
 261     set_call_libfuncs(SETNAME(INITLIB), 1, 1, SysBase);
 262
 263     /* Multitasking is on. Call CoolCapture. */
 264     if (SysBase->CoolCapture)
 265     {
 266         DINIT("Calling CoolCapture at 0x%p", SysBase->CoolCapture);
 267
 268         AROS_UFC1(void, SysBase->CoolCapture,
 269             AROS_UFCA(struct Library *, (struct Library *)SysBase, A6));
 270     }
 271
 272     /* Done. Following the convention, we return our base pointer. */
 273     return SysBase;
 274
 275     AROS_USERFUNC_EXIT
 276 }
 277
 278 AROS_PLH1(struct ExecBase *, open,
 279     AROS_LHA(ULONG, version, D0),
 280     struct ExecBase *, SysBase, 1, Exec)
 281 {
 282     AROS_LIBFUNC_INIT
 283
 284     /* I have one more opener. */
 285     SysBase->LibNode.lib_OpenCnt++;
 286     return SysBase;
 287     AROS_LIBFUNC_EXIT
 288 }
 289
 290 AROS_PLH0(BPTR, close,
 291     struct ExecBase *, SysBase, 2, Exec)
 292 {
 293     AROS_LIBFUNC_INIT
 294
 295     /* I have one fewer opener. */
 296     SysBase->LibNode.lib_OpenCnt--;
 297     return 0;
 298     AROS_LIBFUNC_EXIT
 299 }