git.oblomov.eu Git - linux-2.6/blob - arch/powerpc/platforms/iseries/mf.c

   1 /*
   2  * Copyright (C) 2001 Troy D. Armstrong  IBM Corporation
   3  * Copyright (C) 2004-2005 Stephen Rothwell  IBM Corporation
   4  *
   5  * This modules exists as an interface between a Linux secondary partition
   6  * running on an iSeries and the primary partition's Virtual Service
   7  * Processor (VSP) object.  The VSP has final authority over powering on/off
   8  * all partitions in the iSeries.  It also provides miscellaneous low-level
   9  * machine facility type operations.
  10  *
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  25  */
  26
  27 #include <linux/types.h>
  28 #include <linux/errno.h>
  29 #include <linux/kernel.h>
  30 #include <linux/init.h>
  31 #include <linux/completion.h>
  32 #include <linux/delay.h>
  33 #include <linux/dma-mapping.h>
  34 #include <linux/bcd.h>
  35 #include <linux/rtc.h>
  36
  37 #include <asm/time.h>
  38 #include <asm/uaccess.h>
  39 #include <asm/paca.h>
  40 #include <asm/abs_addr.h>
  41 #include <asm/firmware.h>
  42 #include <asm/iseries/mf.h>
  43 #include <asm/iseries/hv_lp_config.h>
  44 #include <asm/iseries/hv_lp_event.h>
  45 #include <asm/iseries/it_lp_queue.h>
  46
  47 #include "setup.h"
  48
  49 static int mf_initialized;
  50
  51 /*
  52  * This is the structure layout for the Machine Facilites LPAR event
  53  * flows.
  54  */
  55 struct vsp_cmd_data {
  56         u64 token;
  57         u16 cmd;
  58         HvLpIndex lp_index;
  59         u8 result_code;
  60         u32 reserved;
  61         union {
  62                 u64 state;      /* GetStateOut */
  63                 u64 ipl_type;   /* GetIplTypeOut, Function02SelectIplTypeIn */
  64                 u64 ipl_mode;   /* GetIplModeOut, Function02SelectIplModeIn */
  65                 u64 page[4];    /* GetSrcHistoryIn */
  66                 u64 flag;       /* GetAutoIplWhenPrimaryIplsOut,
  67                                    SetAutoIplWhenPrimaryIplsIn,
  68                                    WhiteButtonPowerOffIn,
  69                                    Function08FastPowerOffIn,
  70                                    IsSpcnRackPowerIncompleteOut */
  71                 struct {
  72                         u64 token;
  73                         u64 address_type;
  74                         u64 side;
  75                         u32 length;
  76                         u32 offset;
  77                 } kern;         /* SetKernelImageIn, GetKernelImageIn,
  78                                    SetKernelCmdLineIn, GetKernelCmdLineIn */
  79                 u32 length_out; /* GetKernelImageOut, GetKernelCmdLineOut */
  80                 u8 reserved[80];
  81         } sub_data;
  82 };
  83
  84 struct vsp_rsp_data {
  85         struct completion com;
  86         struct vsp_cmd_data *response;
  87 };
  88
  89 struct alloc_data {
  90         u16 size;
  91         u16 type;
  92         u32 count;
  93         u16 reserved1;
  94         u8 reserved2;
  95         HvLpIndex target_lp;
  96 };
  97
  98 struct ce_msg_data;
  99
 100 typedef void (*ce_msg_comp_hdlr)(void *token, struct ce_msg_data *vsp_cmd_rsp);
 101
 102 struct ce_msg_comp_data {
 103         ce_msg_comp_hdlr handler;
 104         void *token;
 105 };
 106
 107 struct ce_msg_data {
 108         u8 ce_msg[12];
 109         char reserved[4];
 110         struct ce_msg_comp_data *completion;
 111 };
 112
 113 struct io_mf_lp_event {
 114         struct HvLpEvent hp_lp_event;
 115         u16 subtype_result_code;
 116         u16 reserved1;
 117         u32 reserved2;
 118         union {
 119                 struct alloc_data alloc;
 120                 struct ce_msg_data ce_msg;
 121                 struct vsp_cmd_data vsp_cmd;
 122         } data;
 123 };
 124
 125 #define subtype_data(a, b, c, d)        \
 126                 (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
 127
 128 /*
 129  * All outgoing event traffic is kept on a FIFO queue.  The first
 130  * pointer points to the one that is outstanding, and all new
 131  * requests get stuck on the end.  Also, we keep a certain number of
 132  * preallocated pending events so that we can operate very early in
 133  * the boot up sequence (before kmalloc is ready).
 134  */
 135 struct pending_event {
 136         struct pending_event *next;
 137         struct io_mf_lp_event event;
 138         MFCompleteHandler hdlr;
 139         char dma_data[72];
 140         unsigned dma_data_length;
 141         unsigned remote_address;
 142 };
 143 static spinlock_t pending_event_spinlock;
 144 static struct pending_event *pending_event_head;
 145 static struct pending_event *pending_event_tail;
 146 static struct pending_event *pending_event_avail;
 147 #define PENDING_EVENT_PREALLOC_LEN 16
 148 static struct pending_event pending_event_prealloc[PENDING_EVENT_PREALLOC_LEN];
 149
 150 /*
 151  * Put a pending event onto the available queue, so it can get reused.
 152  * Attention! You must have the pending_event_spinlock before calling!
 153  */
 154 static void free_pending_event(struct pending_event *ev)
 155 {
 156         if (ev != NULL) {
 157                 ev->next = pending_event_avail;
 158                 pending_event_avail = ev;
 159         }
 160 }
 161
 162 /*
 163  * Enqueue the outbound event onto the stack.  If the queue was
 164  * empty to begin with, we must also issue it via the Hypervisor
 165  * interface.  There is a section of code below that will touch
 166  * the first stack pointer without the protection of the pending_event_spinlock.
 167  * This is OK, because we know that nobody else will be modifying
 168  * the first pointer when we do this.
 169  */
 170 static int signal_event(struct pending_event *ev)
 171 {
 172         int rc = 0;
 173         unsigned long flags;
 174         int go = 1;
 175         struct pending_event *ev1;
 176         HvLpEvent_Rc hv_rc;
 177
 178         /* enqueue the event */
 179         if (ev != NULL) {
 180                 ev->next = NULL;
 181                 spin_lock_irqsave(&pending_event_spinlock, flags);
 182                 if (pending_event_head == NULL)
 183                         pending_event_head = ev;
 184                 else {
 185                         go = 0;
 186                         pending_event_tail->next = ev;
 187                 }
 188                 pending_event_tail = ev;
 189                 spin_unlock_irqrestore(&pending_event_spinlock, flags);
 190         }
 191
 192         /* send the event */
 193         while (go) {
 194                 go = 0;
 195
 196                 /* any DMA data to send beforehand? */
 197                 if (pending_event_head->dma_data_length > 0)
 198                         HvCallEvent_dmaToSp(pending_event_head->dma_data,
 199                                         pending_event_head->remote_address,
 200                                         pending_event_head->dma_data_length,
 201                                         HvLpDma_Direction_LocalToRemote);
 202
 203                 hv_rc = HvCallEvent_signalLpEvent(
 204                                 &pending_event_head->event.hp_lp_event);
 205                 if (hv_rc != HvLpEvent_Rc_Good) {
 206                         printk(KERN_ERR "mf.c: HvCallEvent_signalLpEvent() "
 207                                         "failed with %d\n", (int)hv_rc);
 208
 209                         spin_lock_irqsave(&pending_event_spinlock, flags);
 210                         ev1 = pending_event_head;
 211                         pending_event_head = pending_event_head->next;
 212                         if (pending_event_head != NULL)
 213                                 go = 1;
 214                         spin_unlock_irqrestore(&pending_event_spinlock, flags);
 215
 216                         if (ev1 == ev)
 217                                 rc = -EIO;
 218                         else if (ev1->hdlr != NULL)
 219                                 (*ev1->hdlr)((void *)ev1->event.hp_lp_event.xCorrelationToken, -EIO);
 220
 221                         spin_lock_irqsave(&pending_event_spinlock, flags);
 222                         free_pending_event(ev1);
 223                         spin_unlock_irqrestore(&pending_event_spinlock, flags);
 224                 }
 225         }
 226
 227         return rc;
 228 }
 229
 230 /*
 231  * Allocate a new pending_event structure, and initialize it.
 232  */
 233 static struct pending_event *new_pending_event(void)
 234 {
 235         struct pending_event *ev = NULL;
 236         HvLpIndex primary_lp = HvLpConfig_getPrimaryLpIndex();
 237         unsigned long flags;
 238         struct HvLpEvent *hev;
 239
 240         spin_lock_irqsave(&pending_event_spinlock, flags);
 241         if (pending_event_avail != NULL) {
 242                 ev = pending_event_avail;
 243                 pending_event_avail = pending_event_avail->next;
 244         }
 245         spin_unlock_irqrestore(&pending_event_spinlock, flags);
 246         if (ev == NULL) {
 247                 ev = kmalloc(sizeof(struct pending_event), GFP_ATOMIC);
 248                 if (ev == NULL) {
 249                         printk(KERN_ERR "mf.c: unable to kmalloc %ld bytes\n",
 250                                         sizeof(struct pending_event));
 251                         return NULL;
 252                 }
 253         }
 254         memset(ev, 0, sizeof(struct pending_event));
 255         hev = &ev->event.hp_lp_event;
 256         hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DO_ACK | HV_LP_EVENT_INT;
 257         hev->xType = HvLpEvent_Type_MachineFac;
 258         hev->xSourceLp = HvLpConfig_getLpIndex();
 259         hev->xTargetLp = primary_lp;
 260         hev->xSizeMinus1 = sizeof(ev->event) - 1;
 261         hev->xRc = HvLpEvent_Rc_Good;
 262         hev->xSourceInstanceId = HvCallEvent_getSourceLpInstanceId(primary_lp,
 263                         HvLpEvent_Type_MachineFac);
 264         hev->xTargetInstanceId = HvCallEvent_getTargetLpInstanceId(primary_lp,
 265                         HvLpEvent_Type_MachineFac);
 266
 267         return ev;
 268 }
 269
 270 static int signal_vsp_instruction(struct vsp_cmd_data *vsp_cmd)
 271 {
 272         struct pending_event *ev = new_pending_event();
 273         int rc;
 274         struct vsp_rsp_data response;
 275
 276         if (ev == NULL)
 277                 return -ENOMEM;
 278
 279         init_completion(&response.com);
 280         response.response = vsp_cmd;
 281         ev->event.hp_lp_event.xSubtype = 6;
 282         ev->event.hp_lp_event.x.xSubtypeData =
 283                 subtype_data('M', 'F',  'V',  'I');
 284         ev->event.data.vsp_cmd.token = (u64)&response;
 285         ev->event.data.vsp_cmd.cmd = vsp_cmd->cmd;
 286         ev->event.data.vsp_cmd.lp_index = HvLpConfig_getLpIndex();
 287         ev->event.data.vsp_cmd.result_code = 0xFF;
 288         ev->event.data.vsp_cmd.reserved = 0;
 289         memcpy(&(ev->event.data.vsp_cmd.sub_data),
 290                         &(vsp_cmd->sub_data), sizeof(vsp_cmd->sub_data));
 291         mb();
 292
 293         rc = signal_event(ev);
 294         if (rc == 0)
 295                 wait_for_completion(&response.com);
 296         return rc;
 297 }
 298
 299
 300 /*
 301  * Send a 12-byte CE message to the primary partition VSP object
 302  */
 303 static int signal_ce_msg(char *ce_msg, struct ce_msg_comp_data *completion)
 304 {
 305         struct pending_event *ev = new_pending_event();
 306
 307         if (ev == NULL)
 308                 return -ENOMEM;
 309
 310         ev->event.hp_lp_event.xSubtype = 0;
 311         ev->event.hp_lp_event.x.xSubtypeData =
 312                 subtype_data('M',  'F',  'C',  'E');
 313         memcpy(ev->event.data.ce_msg.ce_msg, ce_msg, 12);
 314         ev->event.data.ce_msg.completion = completion;
 315         return signal_event(ev);
 316 }
 317
 318 /*
 319  * Send a 12-byte CE message (with no data) to the primary partition VSP object
 320  */
 321 static int signal_ce_msg_simple(u8 ce_op, struct ce_msg_comp_data *completion)
 322 {
 323         u8 ce_msg[12];
 324
 325         memset(ce_msg, 0, sizeof(ce_msg));
 326         ce_msg[3] = ce_op;
 327         return signal_ce_msg(ce_msg, completion);
 328 }
 329
 330 /*
 331  * Send a 12-byte CE message and DMA data to the primary partition VSP object
 332  */
 333 static int dma_and_signal_ce_msg(char *ce_msg,
 334                 struct ce_msg_comp_data *completion, void *dma_data,
 335                 unsigned dma_data_length, unsigned remote_address)
 336 {
 337         struct pending_event *ev = new_pending_event();
 338
 339         if (ev == NULL)
 340                 return -ENOMEM;
 341
 342         ev->event.hp_lp_event.xSubtype = 0;
 343         ev->event.hp_lp_event.x.xSubtypeData =
 344                 subtype_data('M', 'F', 'C', 'E');
 345         memcpy(ev->event.data.ce_msg.ce_msg, ce_msg, 12);
 346         ev->event.data.ce_msg.completion = completion;
 347         memcpy(ev->dma_data, dma_data, dma_data_length);
 348         ev->dma_data_length = dma_data_length;
 349         ev->remote_address = remote_address;
 350         return signal_event(ev);
 351 }
 352
 353 /*
 354  * Initiate a nice (hopefully) shutdown of Linux.  We simply are
 355  * going to try and send the init process a SIGINT signal.  If
 356  * this fails (why?), we'll simply force it off in a not-so-nice
 357  * manner.
 358  */
 359 static int shutdown(void)
 360 {
 361         int rc = kill_cad_pid(SIGINT, 1);
 362
 363         if (rc) {
 364                 printk(KERN_ALERT "mf.c: SIGINT to init failed (%d), "
 365                                 "hard shutdown commencing\n", rc);
 366                 mf_power_off();
 367         } else
 368                 printk(KERN_INFO "mf.c: init has been successfully notified "
 369                                 "to proceed with shutdown\n");
 370         return rc;
 371 }
 372
 373 /*
 374  * The primary partition VSP object is sending us a new
 375  * event flow.  Handle it...
 376  */
 377 static void handle_int(struct io_mf_lp_event *event)
 378 {
 379         struct ce_msg_data *ce_msg_data;
 380         struct ce_msg_data *pce_msg_data;
 381         unsigned long flags;
 382         struct pending_event *pev;
 383
 384         /* ack the interrupt */
 385         event->hp_lp_event.xRc = HvLpEvent_Rc_Good;
 386         HvCallEvent_ackLpEvent(&event->hp_lp_event);
 387
 388         /* process interrupt */
 389         switch (event->hp_lp_event.xSubtype) {
 390         case 0: /* CE message */
 391                 ce_msg_data = &event->data.ce_msg;
 392                 switch (ce_msg_data->ce_msg[3]) {
 393                 case 0x5B:      /* power control notification */
 394                         if ((ce_msg_data->ce_msg[5] & 0x20) != 0) {
 395                                 printk(KERN_INFO "mf.c: Commencing partition shutdown\n");
 396                                 if (shutdown() == 0)
 397                                         signal_ce_msg_simple(0xDB, NULL);
 398                         }
 399                         break;
 400                 case 0xC0:      /* get time */
 401                         spin_lock_irqsave(&pending_event_spinlock, flags);
 402                         pev = pending_event_head;
 403                         if (pev != NULL)
 404                                 pending_event_head = pending_event_head->next;
 405                         spin_unlock_irqrestore(&pending_event_spinlock, flags);
 406                         if (pev == NULL)
 407                                 break;
 408                         pce_msg_data = &pev->event.data.ce_msg;
 409                         if (pce_msg_data->ce_msg[3] != 0x40)
 410                                 break;
 411                         if (pce_msg_data->completion != NULL) {
 412                                 ce_msg_comp_hdlr handler =
 413                                         pce_msg_data->completion->handler;
 414                                 void *token = pce_msg_data->completion->token;
 415
 416                                 if (handler != NULL)
 417                                         (*handler)(token, ce_msg_data);
 418                         }
 419                         spin_lock_irqsave(&pending_event_spinlock, flags);
 420                         free_pending_event(pev);
 421                         spin_unlock_irqrestore(&pending_event_spinlock, flags);
 422                         /* send next waiting event */
 423                         if (pending_event_head != NULL)
 424                                 signal_event(NULL);
 425                         break;
 426                 }
 427                 break;
 428         case 1: /* IT sys shutdown */
 429                 printk(KERN_INFO "mf.c: Commencing system shutdown\n");
 430                 shutdown();
 431                 break;
 432         }
 433 }
 434
 435 /*
 436  * The primary partition VSP object is acknowledging the receipt
 437  * of a flow we sent to them.  If there are other flows queued
 438  * up, we must send another one now...
 439  */
 440 static void handle_ack(struct io_mf_lp_event *event)
 441 {
 442         unsigned long flags;
 443         struct pending_event *two = NULL;
 444         unsigned long free_it = 0;
 445         struct ce_msg_data *ce_msg_data;
 446         struct ce_msg_data *pce_msg_data;
 447         struct vsp_rsp_data *rsp;
 448
 449         /* handle current event */
 450         if (pending_event_head == NULL) {
 451                 printk(KERN_ERR "mf.c: stack empty for receiving ack\n");
 452                 return;
 453         }
 454
 455         switch (event->hp_lp_event.xSubtype) {
 456         case 0:     /* CE msg */
 457                 ce_msg_data = &event->data.ce_msg;
 458                 if (ce_msg_data->ce_msg[3] != 0x40) {
 459                         free_it = 1;
 460                         break;
 461                 }
 462                 if (ce_msg_data->ce_msg[2] == 0)
 463                         break;
 464                 free_it = 1;
 465                 pce_msg_data = &pending_event_head->event.data.ce_msg;
 466                 if (pce_msg_data->completion != NULL) {
 467                         ce_msg_comp_hdlr handler =
 468                                 pce_msg_data->completion->handler;
 469                         void *token = pce_msg_data->completion->token;
 470
 471                         if (handler != NULL)
 472                                 (*handler)(token, ce_msg_data);
 473                 }
 474                 break;
 475         case 4: /* allocate */
 476         case 5: /* deallocate */
 477                 if (pending_event_head->hdlr != NULL)
 478                         (*pending_event_head->hdlr)((void *)event->hp_lp_event.xCorrelationToken, event->data.alloc.count);
 479                 free_it = 1;
 480                 break;
 481         case 6:
 482                 free_it = 1;
 483                 rsp = (struct vsp_rsp_data *)event->data.vsp_cmd.token;
 484                 if (rsp == NULL) {
 485                         printk(KERN_ERR "mf.c: no rsp\n");
 486                         break;
 487                 }
 488                 if (rsp->response != NULL)
 489                         memcpy(rsp->response, &event->data.vsp_cmd,
 490                                         sizeof(event->data.vsp_cmd));
 491                 complete(&rsp->com);
 492                 break;
 493         }
 494
 495         /* remove from queue */
 496         spin_lock_irqsave(&pending_event_spinlock, flags);
 497         if ((pending_event_head != NULL) && (free_it == 1)) {
 498                 struct pending_event *oldHead = pending_event_head;
 499
 500                 pending_event_head = pending_event_head->next;
 501                 two = pending_event_head;
 502                 free_pending_event(oldHead);
 503         }
 504         spin_unlock_irqrestore(&pending_event_spinlock, flags);
 505
 506         /* send next waiting event */
 507         if (two != NULL)
 508                 signal_event(NULL);
 509 }
 510
 511 /*
 512  * This is the generic event handler we are registering with
 513  * the Hypervisor.  Ensure the flows are for us, and then
 514  * parse it enough to know if it is an interrupt or an
 515  * acknowledge.
 516  */
 517 static void hv_handler(struct HvLpEvent *event)
 518 {
 519         if ((event != NULL) && (event->xType == HvLpEvent_Type_MachineFac)) {
 520                 if (hvlpevent_is_ack(event))
 521                         handle_ack((struct io_mf_lp_event *)event);
 522                 else
 523                         handle_int((struct io_mf_lp_event *)event);
 524         } else
 525                 printk(KERN_ERR "mf.c: alien event received\n");
 526 }
 527
 528 /*
 529  * Global kernel interface to allocate and seed events into the
 530  * Hypervisor.
 531  */
 532 void mf_allocate_lp_events(HvLpIndex target_lp, HvLpEvent_Type type,
 533                 unsigned size, unsigned count, MFCompleteHandler hdlr,
 534                 void *user_token)
 535 {
 536         struct pending_event *ev = new_pending_event();
 537         int rc;
 538
 539         if (ev == NULL) {
 540                 rc = -ENOMEM;
 541         } else {
 542                 ev->event.hp_lp_event.xSubtype = 4;
 543                 ev->event.hp_lp_event.xCorrelationToken = (u64)user_token;
 544                 ev->event.hp_lp_event.x.xSubtypeData =
 545                         subtype_data('M', 'F', 'M', 'A');
 546                 ev->event.data.alloc.target_lp = target_lp;
 547                 ev->event.data.alloc.type = type;
 548                 ev->event.data.alloc.size = size;
 549                 ev->event.data.alloc.count = count;
 550                 ev->hdlr = hdlr;
 551                 rc = signal_event(ev);
 552         }
 553         if ((rc != 0) && (hdlr != NULL))
 554                 (*hdlr)(user_token, rc);
 555 }
 556 EXPORT_SYMBOL(mf_allocate_lp_events);
 557
 558 /*
 559  * Global kernel interface to unseed and deallocate events already in
 560  * Hypervisor.
 561  */
 562 void mf_deallocate_lp_events(HvLpIndex target_lp, HvLpEvent_Type type,
 563                 unsigned count, MFCompleteHandler hdlr, void *user_token)
 564 {
 565         struct pending_event *ev = new_pending_event();
 566         int rc;
 567
 568         if (ev == NULL)
 569                 rc = -ENOMEM;
 570         else {
 571                 ev->event.hp_lp_event.xSubtype = 5;
 572                 ev->event.hp_lp_event.xCorrelationToken = (u64)user_token;
 573                 ev->event.hp_lp_event.x.xSubtypeData =
 574                         subtype_data('M', 'F', 'M', 'D');
 575                 ev->event.data.alloc.target_lp = target_lp;
 576                 ev->event.data.alloc.type = type;
 577                 ev->event.data.alloc.count = count;
 578                 ev->hdlr = hdlr;
 579                 rc = signal_event(ev);
 580         }
 581         if ((rc != 0) && (hdlr != NULL))
 582                 (*hdlr)(user_token, rc);
 583 }
 584 EXPORT_SYMBOL(mf_deallocate_lp_events);
 585
 586 /*
 587  * Global kernel interface to tell the VSP object in the primary
 588  * partition to power this partition off.
 589  */
 590 void mf_power_off(void)
 591 {
 592         printk(KERN_INFO "mf.c: Down it goes...\n");
 593         signal_ce_msg_simple(0x4d, NULL);
 594         for (;;)
 595                 ;
 596 }
 597
 598 /*
 599  * Global kernel interface to tell the VSP object in the primary
 600  * partition to reboot this partition.
 601  */
 602 void mf_reboot(char *cmd)
 603 {
 604         printk(KERN_INFO "mf.c: Preparing to bounce...\n");
 605         signal_ce_msg_simple(0x4e, NULL);
 606         for (;;)
 607                 ;
 608 }
 609
 610 /*
 611  * Display a single word SRC onto the VSP control panel.
 612  */
 613 void mf_display_src(u32 word)
 614 {
 615         u8 ce[12];
 616
 617         memset(ce, 0, sizeof(ce));
 618         ce[3] = 0x4a;
 619         ce[7] = 0x01;
 620         ce[8] = word >> 24;
 621         ce[9] = word >> 16;
 622         ce[10] = word >> 8;
 623         ce[11] = word;
 624         signal_ce_msg(ce, NULL);
 625 }
 626
 627 /*
 628  * Display a single word SRC of the form "PROGXXXX" on the VSP control panel.
 629  */
 630 static __init void mf_display_progress_src(u16 value)
 631 {
 632         u8 ce[12];
 633         u8 src[72];
 634
 635         memcpy(ce, "\x00\x00\x04\x4A\x00\x00\x00\x48\x00\x00\x00\x00", 12);
 636         memcpy(src, "\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00"
 637                 "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
 638                 "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
 639                 "\x00\x00\x00\x00PROGxxxx                        ",
 640                 72);
 641         src[6] = value >> 8;
 642         src[7] = value & 255;
 643         src[44] = "0123456789ABCDEF"[(value >> 12) & 15];
 644         src[45] = "0123456789ABCDEF"[(value >> 8) & 15];
 645         src[46] = "0123456789ABCDEF"[(value >> 4) & 15];
 646         src[47] = "0123456789ABCDEF"[value & 15];
 647         dma_and_signal_ce_msg(ce, NULL, src, sizeof(src), 9 * 64 * 1024);
 648 }
 649
 650 /*
 651  * Clear the VSP control panel.  Used to "erase" an SRC that was
 652  * previously displayed.
 653  */
 654 static void mf_clear_src(void)
 655 {
 656         signal_ce_msg_simple(0x4b, NULL);
 657 }
 658
 659 void __init mf_display_progress(u16 value)
 660 {
 661         if (!mf_initialized)
 662                 return;
 663
 664         if (0xFFFF == value)
 665                 mf_clear_src();
 666         else
 667                 mf_display_progress_src(value);
 668 }
 669
 670 /*
 671  * Initialization code here.
 672  */
 673 void __init mf_init(void)
 674 {
 675         int i;
 676
 677         spin_lock_init(&pending_event_spinlock);
 678
 679         for (i = 0; i < PENDING_EVENT_PREALLOC_LEN; i++)
 680                 free_pending_event(&pending_event_prealloc[i]);
 681
 682         HvLpEvent_registerHandler(HvLpEvent_Type_MachineFac, &hv_handler);
 683
 684         /* virtual continue ack */
 685         signal_ce_msg_simple(0x57, NULL);
 686
 687         mf_initialized = 1;
 688         mb();
 689
 690         printk(KERN_NOTICE "mf.c: iSeries Linux LPAR Machine Facilities "
 691                         "initialized\n");
 692 }
 693
 694 struct rtc_time_data {
 695         struct completion com;
 696         struct ce_msg_data ce_msg;
 697         int rc;
 698 };
 699
 700 static void get_rtc_time_complete(void *token, struct ce_msg_data *ce_msg)
 701 {
 702         struct rtc_time_data *rtc = token;
 703
 704         memcpy(&rtc->ce_msg, ce_msg, sizeof(rtc->ce_msg));
 705         rtc->rc = 0;
 706         complete(&rtc->com);
 707 }
 708
 709 static int mf_set_rtc(struct rtc_time *tm)
 710 {
 711         char ce_time[12];
 712         u8 day, mon, hour, min, sec, y1, y2;
 713         unsigned year;
 714
 715         year = 1900 + tm->tm_year;
 716         y1 = year / 100;
 717         y2 = year % 100;
 718
 719         sec = tm->tm_sec;
 720         min = tm->tm_min;
 721         hour = tm->tm_hour;
 722         day = tm->tm_mday;
 723         mon = tm->tm_mon + 1;
 724
 725         BIN_TO_BCD(sec);
 726         BIN_TO_BCD(min);
 727         BIN_TO_BCD(hour);
 728         BIN_TO_BCD(mon);
 729         BIN_TO_BCD(day);
 730         BIN_TO_BCD(y1);
 731         BIN_TO_BCD(y2);
 732
 733         memset(ce_time, 0, sizeof(ce_time));
 734         ce_time[3] = 0x41;
 735         ce_time[4] = y1;
 736         ce_time[5] = y2;
 737         ce_time[6] = sec;
 738         ce_time[7] = min;
 739         ce_time[8] = hour;
 740         ce_time[10] = day;
 741         ce_time[11] = mon;
 742
 743         return signal_ce_msg(ce_time, NULL);
 744 }
 745
 746 static int rtc_set_tm(int rc, u8 *ce_msg, struct rtc_time *tm)
 747 {
 748         tm->tm_wday = 0;
 749         tm->tm_yday = 0;
 750         tm->tm_isdst = 0;
 751         if (rc) {
 752                 tm->tm_sec = 0;
 753                 tm->tm_min = 0;
 754                 tm->tm_hour = 0;
 755                 tm->tm_mday = 15;
 756                 tm->tm_mon = 5;
 757                 tm->tm_year = 52;
 758                 return rc;
 759         }
 760
 761         if ((ce_msg[2] == 0xa9) ||
 762             (ce_msg[2] == 0xaf)) {
 763                 /* TOD clock is not set */
 764                 tm->tm_sec = 1;
 765                 tm->tm_min = 1;
 766                 tm->tm_hour = 1;
 767                 tm->tm_mday = 10;
 768                 tm->tm_mon = 8;
 769                 tm->tm_year = 71;
 770                 mf_set_rtc(tm);
 771         }
 772         {
 773                 u8 year = ce_msg[5];
 774                 u8 sec = ce_msg[6];
 775                 u8 min = ce_msg[7];
 776                 u8 hour = ce_msg[8];
 777                 u8 day = ce_msg[10];
 778                 u8 mon = ce_msg[11];
 779
 780                 BCD_TO_BIN(sec);
 781                 BCD_TO_BIN(min);
 782                 BCD_TO_BIN(hour);
 783                 BCD_TO_BIN(day);
 784                 BCD_TO_BIN(mon);
 785                 BCD_TO_BIN(year);
 786
 787                 if (year <= 69)
 788                         year += 100;
 789
 790                 tm->tm_sec = sec;
 791                 tm->tm_min = min;
 792                 tm->tm_hour = hour;
 793                 tm->tm_mday = day;
 794                 tm->tm_mon = mon;
 795                 tm->tm_year = year;
 796         }
 797
 798         return 0;
 799 }
 800
 801 static int mf_get_rtc(struct rtc_time *tm)
 802 {
 803         struct ce_msg_comp_data ce_complete;
 804         struct rtc_time_data rtc_data;
 805         int rc;
 806
 807         memset(&ce_complete, 0, sizeof(ce_complete));
 808         memset(&rtc_data, 0, sizeof(rtc_data));
 809         init_completion(&rtc_data.com);
 810         ce_complete.handler = &get_rtc_time_complete;
 811         ce_complete.token = &rtc_data;
 812         rc = signal_ce_msg_simple(0x40, &ce_complete);
 813         if (rc)
 814                 return rc;
 815         wait_for_completion(&rtc_data.com);
 816         return rtc_set_tm(rtc_data.rc, rtc_data.ce_msg.ce_msg, tm);
 817 }
 818
 819 struct boot_rtc_time_data {
 820         int busy;
 821         struct ce_msg_data ce_msg;
 822         int rc;
 823 };
 824
 825 static void get_boot_rtc_time_complete(void *token, struct ce_msg_data *ce_msg)
 826 {
 827         struct boot_rtc_time_data *rtc = token;
 828
 829         memcpy(&rtc->ce_msg, ce_msg, sizeof(rtc->ce_msg));
 830         rtc->rc = 0;
 831         rtc->busy = 0;
 832 }
 833
 834 static int mf_get_boot_rtc(struct rtc_time *tm)
 835 {
 836         struct ce_msg_comp_data ce_complete;
 837         struct boot_rtc_time_data rtc_data;
 838         int rc;
 839
 840         memset(&ce_complete, 0, sizeof(ce_complete));
 841         memset(&rtc_data, 0, sizeof(rtc_data));
 842         rtc_data.busy = 1;
 843         ce_complete.handler = &get_boot_rtc_time_complete;
 844         ce_complete.token = &rtc_data;
 845         rc = signal_ce_msg_simple(0x40, &ce_complete);
 846         if (rc)
 847                 return rc;
 848         /* We need to poll here as we are not yet taking interrupts */
 849         while (rtc_data.busy) {
 850                 if (hvlpevent_is_pending())
 851                         process_hvlpevents();
 852         }
 853         return rtc_set_tm(rtc_data.rc, rtc_data.ce_msg.ce_msg, tm);
 854 }
 855
 856 #ifdef CONFIG_PROC_FS
 857
 858 static int proc_mf_dump_cmdline(char *page, char **start, off_t off,
 859                 int count, int *eof, void *data)
 860 {
 861         int len;
 862         char *p;
 863         struct vsp_cmd_data vsp_cmd;
 864         int rc;
 865         dma_addr_t dma_addr;
 866
 867         /* The HV appears to return no more than 256 bytes of command line */
 868         if (off >= 256)
 869                 return 0;
 870         if ((off + count) > 256)
 871                 count = 256 - off;
 872
 873         dma_addr = iseries_hv_map(page, off + count, DMA_FROM_DEVICE);
 874         if (dma_mapping_error(dma_addr))
 875                 return -ENOMEM;
 876         memset(page, 0, off + count);
 877         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
 878         vsp_cmd.cmd = 33;
 879         vsp_cmd.sub_data.kern.token = dma_addr;
 880         vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
 881         vsp_cmd.sub_data.kern.side = (u64)data;
 882         vsp_cmd.sub_data.kern.length = off + count;
 883         mb();
 884         rc = signal_vsp_instruction(&vsp_cmd);
 885         iseries_hv_unmap(dma_addr, off + count, DMA_FROM_DEVICE);
 886         if (rc)
 887                 return rc;
 888         if (vsp_cmd.result_code != 0)
 889                 return -ENOMEM;
 890         p = page;
 891         len = 0;
 892         while (len < (off + count)) {
 893                 if ((*p == '\0') || (*p == '\n')) {
 894                         if (*p == '\0')
 895                                 *p = '\n';
 896                         p++;
 897                         len++;
 898                         *eof = 1;
 899                         break;
 900                 }
 901                 p++;
 902                 len++;
 903         }
 904
 905         if (len < off) {
 906                 *eof = 1;
 907                 len = 0;
 908         }
 909         return len;
 910 }
 911
 912 #if 0
 913 static int mf_getVmlinuxChunk(char *buffer, int *size, int offset, u64 side)
 914 {
 915         struct vsp_cmd_data vsp_cmd;
 916         int rc;
 917         int len = *size;
 918         dma_addr_t dma_addr;
 919
 920         dma_addr = iseries_hv_map(buffer, len, DMA_FROM_DEVICE);
 921         memset(buffer, 0, len);
 922         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
 923         vsp_cmd.cmd = 32;
 924         vsp_cmd.sub_data.kern.token = dma_addr;
 925         vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
 926         vsp_cmd.sub_data.kern.side = side;
 927         vsp_cmd.sub_data.kern.offset = offset;
 928         vsp_cmd.sub_data.kern.length = len;
 929         mb();
 930         rc = signal_vsp_instruction(&vsp_cmd);
 931         if (rc == 0) {
 932                 if (vsp_cmd.result_code == 0)
 933                         *size = vsp_cmd.sub_data.length_out;
 934                 else
 935                         rc = -ENOMEM;
 936         }
 937
 938         iseries_hv_unmap(dma_addr, len, DMA_FROM_DEVICE);
 939
 940         return rc;
 941 }
 942
 943 static int proc_mf_dump_vmlinux(char *page, char **start, off_t off,
 944                 int count, int *eof, void *data)
 945 {
 946         int sizeToGet = count;
 947
 948         if (!capable(CAP_SYS_ADMIN))
 949                 return -EACCES;
 950
 951         if (mf_getVmlinuxChunk(page, &sizeToGet, off, (u64)data) == 0) {
 952                 if (sizeToGet != 0) {
 953                         *start = page + off;
 954                         return sizeToGet;
 955                 }
 956                 *eof = 1;
 957                 return 0;
 958         }
 959         *eof = 1;
 960         return 0;
 961 }
 962 #endif
 963
 964 static int proc_mf_dump_side(char *page, char **start, off_t off,
 965                 int count, int *eof, void *data)
 966 {
 967         int len;
 968         char mf_current_side = ' ';
 969         struct vsp_cmd_data vsp_cmd;
 970
 971         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
 972         vsp_cmd.cmd = 2;
 973         vsp_cmd.sub_data.ipl_type = 0;
 974         mb();
 975
 976         if (signal_vsp_instruction(&vsp_cmd) == 0) {
 977                 if (vsp_cmd.result_code == 0) {
 978                         switch (vsp_cmd.sub_data.ipl_type) {
 979                         case 0: mf_current_side = 'A';
 980                                 break;
 981                         case 1: mf_current_side = 'B';
 982                                 break;
 983                         case 2: mf_current_side = 'C';
 984                                 break;
 985                         default:        mf_current_side = 'D';
 986                                 break;
 987                         }
 988                 }
 989         }
 990
 991         len = sprintf(page, "%c\n", mf_current_side);
 992
 993         if (len <= (off + count))
 994                 *eof = 1;
 995         *start = page + off;
 996         len -= off;
 997         if (len > count)
 998                 len = count;
 999         if (len < 0)
1000                 len = 0;
1001         return len;
1002 }
1003
1004 static int proc_mf_change_side(struct file *file, const char __user *buffer,
1005                 unsigned long count, void *data)
1006 {
1007         char side;
1008         u64 newSide;
1009         struct vsp_cmd_data vsp_cmd;
1010
1011         if (!capable(CAP_SYS_ADMIN))
1012                 return -EACCES;
1013
1014         if (count == 0)
1015                 return 0;
1016
1017         if (get_user(side, buffer))
1018                 return -EFAULT;
1019
1020         switch (side) {
1021         case 'A':       newSide = 0;
1022                         break;
1023         case 'B':       newSide = 1;
1024                         break;
1025         case 'C':       newSide = 2;
1026                         break;
1027         case 'D':       newSide = 3;
1028                         break;
1029         default:
1030                 printk(KERN_ERR "mf_proc.c: proc_mf_change_side: invalid side\n");
1031                 return -EINVAL;
1032         }
1033
1034         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
1035         vsp_cmd.sub_data.ipl_type = newSide;
1036         vsp_cmd.cmd = 10;
1037
1038         (void)signal_vsp_instruction(&vsp_cmd);
1039
1040         return count;
1041 }
1042
1043 #if 0
1044 static void mf_getSrcHistory(char *buffer, int size)
1045 {
1046         struct IplTypeReturnStuff return_stuff;
1047         struct pending_event *ev = new_pending_event();
1048         int rc = 0;
1049         char *pages[4];
1050
1051         pages[0] = kmalloc(4096, GFP_ATOMIC);
1052         pages[1] = kmalloc(4096, GFP_ATOMIC);
1053         pages[2] = kmalloc(4096, GFP_ATOMIC);
1054         pages[3] = kmalloc(4096, GFP_ATOMIC);
1055         if ((ev == NULL) || (pages[0] == NULL) || (pages[1] == NULL)
1056                          || (pages[2] == NULL) || (pages[3] == NULL))
1057                 return -ENOMEM;
1058
1059         return_stuff.xType = 0;
1060         return_stuff.xRc = 0;
1061         return_stuff.xDone = 0;
1062         ev->event.hp_lp_event.xSubtype = 6;
1063         ev->event.hp_lp_event.x.xSubtypeData =
1064                 subtype_data('M', 'F', 'V', 'I');
1065         ev->event.data.vsp_cmd.xEvent = &return_stuff;
1066         ev->event.data.vsp_cmd.cmd = 4;
1067         ev->event.data.vsp_cmd.lp_index = HvLpConfig_getLpIndex();
1068         ev->event.data.vsp_cmd.result_code = 0xFF;
1069         ev->event.data.vsp_cmd.reserved = 0;
1070         ev->event.data.vsp_cmd.sub_data.page[0] = iseries_hv_addr(pages[0]);
1071         ev->event.data.vsp_cmd.sub_data.page[1] = iseries_hv_addr(pages[1]);
1072         ev->event.data.vsp_cmd.sub_data.page[2] = iseries_hv_addr(pages[2]);
1073         ev->event.data.vsp_cmd.sub_data.page[3] = iseries_hv_addr(pages[3]);
1074         mb();
1075         if (signal_event(ev) != 0)
1076                 return;
1077
1078         while (return_stuff.xDone != 1)
1079                 udelay(10);
1080         if (return_stuff.xRc == 0)
1081                 memcpy(buffer, pages[0], size);
1082         kfree(pages[0]);
1083         kfree(pages[1]);
1084         kfree(pages[2]);
1085         kfree(pages[3]);
1086 }
1087 #endif
1088
1089 static int proc_mf_dump_src(char *page, char **start, off_t off,
1090                 int count, int *eof, void *data)
1091 {
1092 #if 0
1093         int len;
1094
1095         mf_getSrcHistory(page, count);
1096         len = count;
1097         len -= off;
1098         if (len < count) {
1099                 *eof = 1;
1100                 if (len <= 0)
1101                         return 0;
1102         } else
1103                 len = count;
1104         *start = page + off;
1105         return len;
1106 #else
1107         return 0;
1108 #endif
1109 }
1110
1111 static int proc_mf_change_src(struct file *file, const char __user *buffer,
1112                 unsigned long count, void *data)
1113 {
1114         char stkbuf[10];
1115
1116         if (!capable(CAP_SYS_ADMIN))
1117                 return -EACCES;
1118
1119         if ((count < 4) && (count != 1)) {
1120                 printk(KERN_ERR "mf_proc: invalid src\n");
1121                 return -EINVAL;
1122         }
1123
1124         if (count > (sizeof(stkbuf) - 1))
1125                 count = sizeof(stkbuf) - 1;
1126         if (copy_from_user(stkbuf, buffer, count))
1127                 return -EFAULT;
1128
1129         if ((count == 1) && (*stkbuf == '\0'))
1130                 mf_clear_src();
1131         else
1132                 mf_display_src(*(u32 *)stkbuf);
1133
1134         return count;
1135 }
1136
1137 static int proc_mf_change_cmdline(struct file *file, const char __user *buffer,
1138                 unsigned long count, void *data)
1139 {
1140         struct vsp_cmd_data vsp_cmd;
1141         dma_addr_t dma_addr;
1142         char *page;
1143         int ret = -EACCES;
1144
1145         if (!capable(CAP_SYS_ADMIN))
1146                 goto out;
1147
1148         dma_addr = 0;
1149         page = iseries_hv_alloc(count, &dma_addr, GFP_ATOMIC);
1150         ret = -ENOMEM;
1151         if (page == NULL)
1152                 goto out;
1153
1154         ret = -EFAULT;
1155         if (copy_from_user(page, buffer, count))
1156                 goto out_free;
1157
1158         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
1159         vsp_cmd.cmd = 31;
1160         vsp_cmd.sub_data.kern.token = dma_addr;
1161         vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
1162         vsp_cmd.sub_data.kern.side = (u64)data;
1163         vsp_cmd.sub_data.kern.length = count;
1164         mb();
1165         (void)signal_vsp_instruction(&vsp_cmd);
1166         ret = count;
1167
1168 out_free:
1169         iseries_hv_free(count, page, dma_addr);
1170 out:
1171         return ret;
1172 }
1173
1174 static ssize_t proc_mf_change_vmlinux(struct file *file,
1175                                       const char __user *buf,
1176                                       size_t count, loff_t *ppos)
1177 {
1178         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
1179         ssize_t rc;
1180         dma_addr_t dma_addr;
1181         char *page;
1182         struct vsp_cmd_data vsp_cmd;
1183
1184         rc = -EACCES;
1185         if (!capable(CAP_SYS_ADMIN))
1186                 goto out;
1187
1188         dma_addr = 0;
1189         page = iseries_hv_alloc(count, &dma_addr, GFP_ATOMIC);
1190         rc = -ENOMEM;
1191         if (page == NULL) {
1192                 printk(KERN_ERR "mf.c: couldn't allocate memory to set vmlinux chunk\n");
1193                 goto out;
1194         }
1195         rc = -EFAULT;
1196         if (copy_from_user(page, buf, count))
1197                 goto out_free;
1198
1199         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
1200         vsp_cmd.cmd = 30;
1201         vsp_cmd.sub_data.kern.token = dma_addr;
1202         vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
1203         vsp_cmd.sub_data.kern.side = (u64)dp->data;
1204         vsp_cmd.sub_data.kern.offset = *ppos;
1205         vsp_cmd.sub_data.kern.length = count;
1206         mb();
1207         rc = signal_vsp_instruction(&vsp_cmd);
1208         if (rc)
1209                 goto out_free;
1210         rc = -ENOMEM;
1211         if (vsp_cmd.result_code != 0)
1212                 goto out_free;
1213
1214         *ppos += count;
1215         rc = count;
1216 out_free:
1217         iseries_hv_free(count, page, dma_addr);
1218 out:
1219         return rc;
1220 }
1221
1222 static const struct file_operations proc_vmlinux_operations = {
1223         .write          = proc_mf_change_vmlinux,
1224 };
1225
1226 static int __init mf_proc_init(void)
1227 {
1228         struct proc_dir_entry *mf_proc_root;
1229         struct proc_dir_entry *ent;
1230         struct proc_dir_entry *mf;
1231         char name[2];
1232         int i;
1233
1234         if (!firmware_has_feature(FW_FEATURE_ISERIES))
1235                 return 0;
1236
1237         mf_proc_root = proc_mkdir("iSeries/mf", NULL);
1238         if (!mf_proc_root)
1239                 return 1;
1240
1241         name[1] = '\0';
1242         for (i = 0; i < 4; i++) {
1243                 name[0] = 'A' + i;
1244                 mf = proc_mkdir(name, mf_proc_root);
1245                 if (!mf)
1246                         return 1;
1247
1248                 ent = create_proc_entry("cmdline", S_IFREG|S_IRUSR|S_IWUSR, mf);
1249                 if (!ent)
1250                         return 1;
1251                 ent->data = (void *)(long)i;
1252                 ent->read_proc = proc_mf_dump_cmdline;
1253                 ent->write_proc = proc_mf_change_cmdline;
1254
1255                 if (i == 3)     /* no vmlinux entry for 'D' */
1256                         continue;
1257
1258                 ent = create_proc_entry("vmlinux", S_IFREG|S_IWUSR, mf);
1259                 if (!ent)
1260                         return 1;
1261                 ent->data = (void *)(long)i;
1262                 ent->proc_fops = &proc_vmlinux_operations;
1263         }
1264
1265         ent = create_proc_entry("side", S_IFREG|S_IRUSR|S_IWUSR, mf_proc_root);
1266         if (!ent)
1267                 return 1;
1268         ent->data = (void *)0;
1269         ent->read_proc = proc_mf_dump_side;
1270         ent->write_proc = proc_mf_change_side;
1271
1272         ent = create_proc_entry("src", S_IFREG|S_IRUSR|S_IWUSR, mf_proc_root);
1273         if (!ent)
1274                 return 1;
1275         ent->data = (void *)0;
1276         ent->read_proc = proc_mf_dump_src;
1277         ent->write_proc = proc_mf_change_src;
1278
1279         return 0;
1280 }
1281
1282 __initcall(mf_proc_init);
1283
1284 #endif /* CONFIG_PROC_FS */
1285
1286 /*
1287  * Get the RTC from the virtual service processor
1288  * This requires flowing LpEvents to the primary partition
1289  */
1290 void iSeries_get_rtc_time(struct rtc_time *rtc_tm)
1291 {
1292         mf_get_rtc(rtc_tm);
1293         rtc_tm->tm_mon--;
1294 }
1295
1296 /*
1297  * Set the RTC in the virtual service processor
1298  * This requires flowing LpEvents to the primary partition
1299  */
1300 int iSeries_set_rtc_time(struct rtc_time *tm)
1301 {
1302         mf_set_rtc(tm);
1303         return 0;
1304 }
1305
1306 unsigned long iSeries_get_boot_time(void)
1307 {
1308         struct rtc_time tm;
1309
1310         mf_get_boot_rtc(&tm);
1311         return mktime(tm.tm_year + 1900, tm.tm_mon, tm.tm_mday,
1312                       tm.tm_hour, tm.tm_min, tm.tm_sec);
1313 }