root/arch/powerpc/include/asm/epapr_hcalls.h

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INCLUDED FROM

DEFINITIONS

This source file includes following definitions.
  1. epapr_paravirt_early_init
  2. ev_int_set_config
  3. ev_int_get_config
  4. ev_int_set_mask
  5. ev_int_get_mask
  6. ev_int_eoi
  7. ev_byte_channel_send
  8. ev_byte_channel_receive
  9. ev_byte_channel_poll
  10. ev_int_iack
  11. ev_doorbell_send
  12. ev_idle
  13. epapr_hypercall
  14. epapr_hypercall
  15. epapr_hypercall0_1
  16. epapr_hypercall0
  17. epapr_hypercall1
  18. epapr_hypercall2
  19. epapr_hypercall3
  20. epapr_hypercall4
   1 /*
   2  * ePAPR hcall interface
   3  *
   4  * Copyright 2008-2011 Freescale Semiconductor, Inc.
   5  *
   6  * Author: Timur Tabi <timur@freescale.com>
   7  *
   8  * This file is provided under a dual BSD/GPL license.  When using or
   9  * redistributing this file, you may do so under either license.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions are met:
  13  *     * Redistributions of source code must retain the above copyright
  14  *       notice, this list of conditions and the following disclaimer.
  15  *     * Redistributions in binary form must reproduce the above copyright
  16  *       notice, this list of conditions and the following disclaimer in the
  17  *       documentation and/or other materials provided with the distribution.
  18  *     * Neither the name of Freescale Semiconductor nor the
  19  *       names of its contributors may be used to endorse or promote products
  20  *       derived from this software without specific prior written permission.
  21  *
  22  *
  23  * ALTERNATIVELY, this software may be distributed under the terms of the
  24  * GNU General Public License ("GPL") as published by the Free Software
  25  * Foundation, either version 2 of that License or (at your option) any
  26  * later version.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
  29  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  30  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  31  * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
  32  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  33  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  34  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  35  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  36  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  37  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  38  */
  39 
  40 /* A "hypercall" is an "sc 1" instruction.  This header file file provides C
  41  * wrapper functions for the ePAPR hypervisor interface.  It is inteded
  42  * for use by Linux device drivers and other operating systems.
  43  *
  44  * The hypercalls are implemented as inline assembly, rather than assembly
  45  * language functions in a .S file, for optimization.  It allows
  46  * the caller to issue the hypercall instruction directly, improving both
  47  * performance and memory footprint.
  48  */
  49 
  50 #ifndef _EPAPR_HCALLS_H
  51 #define _EPAPR_HCALLS_H
  52 
  53 #include <uapi/asm/epapr_hcalls.h>
  54 
  55 #ifndef __ASSEMBLY__
  56 #include <linux/types.h>
  57 #include <linux/errno.h>
  58 #include <asm/byteorder.h>
  59 
  60 /*
  61  * Hypercall register clobber list
  62  *
  63  * These macros are used to define the list of clobbered registers during a
  64  * hypercall.  Technically, registers r0 and r3-r12 are always clobbered,
  65  * but the gcc inline assembly syntax does not allow us to specify registers
  66  * on the clobber list that are also on the input/output list.  Therefore,
  67  * the lists of clobbered registers depends on the number of register
  68  * parmeters ("+r" and "=r") passed to the hypercall.
  69  *
  70  * Each assembly block should use one of the HCALL_CLOBBERSx macros.  As a
  71  * general rule, 'x' is the number of parameters passed to the assembly
  72  * block *except* for r11.
  73  *
  74  * If you're not sure, just use the smallest value of 'x' that does not
  75  * generate a compilation error.  Because these are static inline functions,
  76  * the compiler will only check the clobber list for a function if you
  77  * compile code that calls that function.
  78  *
  79  * r3 and r11 are not included in any clobbers list because they are always
  80  * listed as output registers.
  81  *
  82  * XER, CTR, and LR are currently listed as clobbers because it's uncertain
  83  * whether they will be clobbered.
  84  *
  85  * Note that r11 can be used as an output parameter.
  86  *
  87  * The "memory" clobber is only necessary for hcalls where the Hypervisor
  88  * will read or write guest memory. However, we add it to all hcalls because
  89  * the impact is minimal, and we want to ensure that it's present for the
  90  * hcalls that need it.
  91 */
  92 
  93 /* List of common clobbered registers.  Do not use this macro. */
  94 #define EV_HCALL_CLOBBERS "r0", "r12", "xer", "ctr", "lr", "cc", "memory"
  95 
  96 #define EV_HCALL_CLOBBERS8 EV_HCALL_CLOBBERS
  97 #define EV_HCALL_CLOBBERS7 EV_HCALL_CLOBBERS8, "r10"
  98 #define EV_HCALL_CLOBBERS6 EV_HCALL_CLOBBERS7, "r9"
  99 #define EV_HCALL_CLOBBERS5 EV_HCALL_CLOBBERS6, "r8"
 100 #define EV_HCALL_CLOBBERS4 EV_HCALL_CLOBBERS5, "r7"
 101 #define EV_HCALL_CLOBBERS3 EV_HCALL_CLOBBERS4, "r6"
 102 #define EV_HCALL_CLOBBERS2 EV_HCALL_CLOBBERS3, "r5"
 103 #define EV_HCALL_CLOBBERS1 EV_HCALL_CLOBBERS2, "r4"
 104 
 105 extern bool epapr_paravirt_enabled;
 106 extern u32 epapr_hypercall_start[];
 107 
 108 #ifdef CONFIG_EPAPR_PARAVIRT
 109 int __init epapr_paravirt_early_init(void);
 110 #else
 111 static inline int epapr_paravirt_early_init(void) { return 0; }
 112 #endif
 113 
 114 /*
 115  * We use "uintptr_t" to define a register because it's guaranteed to be a
 116  * 32-bit integer on a 32-bit platform, and a 64-bit integer on a 64-bit
 117  * platform.
 118  *
 119  * All registers are either input/output or output only.  Registers that are
 120  * initialized before making the hypercall are input/output.  All
 121  * input/output registers are represented with "+r".  Output-only registers
 122  * are represented with "=r".  Do not specify any unused registers.  The
 123  * clobber list will tell the compiler that the hypercall modifies those
 124  * registers, which is good enough.
 125  */
 126 
 127 /**
 128  * ev_int_set_config - configure the specified interrupt
 129  * @interrupt: the interrupt number
 130  * @config: configuration for this interrupt
 131  * @priority: interrupt priority
 132  * @destination: destination CPU number
 133  *
 134  * Returns 0 for success, or an error code.
 135  */
 136 static inline unsigned int ev_int_set_config(unsigned int interrupt,
 137         uint32_t config, unsigned int priority, uint32_t destination)
 138 {
 139         register uintptr_t r11 __asm__("r11");
 140         register uintptr_t r3 __asm__("r3");
 141         register uintptr_t r4 __asm__("r4");
 142         register uintptr_t r5 __asm__("r5");
 143         register uintptr_t r6 __asm__("r6");
 144 
 145         r11 = EV_HCALL_TOKEN(EV_INT_SET_CONFIG);
 146         r3  = interrupt;
 147         r4  = config;
 148         r5  = priority;
 149         r6  = destination;
 150 
 151         asm volatile("bl        epapr_hypercall_start"
 152                 : "+r" (r11), "+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6)
 153                 : : EV_HCALL_CLOBBERS4
 154         );
 155 
 156         return r3;
 157 }
 158 
 159 /**
 160  * ev_int_get_config - return the config of the specified interrupt
 161  * @interrupt: the interrupt number
 162  * @config: returned configuration for this interrupt
 163  * @priority: returned interrupt priority
 164  * @destination: returned destination CPU number
 165  *
 166  * Returns 0 for success, or an error code.
 167  */
 168 static inline unsigned int ev_int_get_config(unsigned int interrupt,
 169         uint32_t *config, unsigned int *priority, uint32_t *destination)
 170 {
 171         register uintptr_t r11 __asm__("r11");
 172         register uintptr_t r3 __asm__("r3");
 173         register uintptr_t r4 __asm__("r4");
 174         register uintptr_t r5 __asm__("r5");
 175         register uintptr_t r6 __asm__("r6");
 176 
 177         r11 = EV_HCALL_TOKEN(EV_INT_GET_CONFIG);
 178         r3 = interrupt;
 179 
 180         asm volatile("bl        epapr_hypercall_start"
 181                 : "+r" (r11), "+r" (r3), "=r" (r4), "=r" (r5), "=r" (r6)
 182                 : : EV_HCALL_CLOBBERS4
 183         );
 184 
 185         *config = r4;
 186         *priority = r5;
 187         *destination = r6;
 188 
 189         return r3;
 190 }
 191 
 192 /**
 193  * ev_int_set_mask - sets the mask for the specified interrupt source
 194  * @interrupt: the interrupt number
 195  * @mask: 0=enable interrupts, 1=disable interrupts
 196  *
 197  * Returns 0 for success, or an error code.
 198  */
 199 static inline unsigned int ev_int_set_mask(unsigned int interrupt,
 200         unsigned int mask)
 201 {
 202         register uintptr_t r11 __asm__("r11");
 203         register uintptr_t r3 __asm__("r3");
 204         register uintptr_t r4 __asm__("r4");
 205 
 206         r11 = EV_HCALL_TOKEN(EV_INT_SET_MASK);
 207         r3 = interrupt;
 208         r4 = mask;
 209 
 210         asm volatile("bl        epapr_hypercall_start"
 211                 : "+r" (r11), "+r" (r3), "+r" (r4)
 212                 : : EV_HCALL_CLOBBERS2
 213         );
 214 
 215         return r3;
 216 }
 217 
 218 /**
 219  * ev_int_get_mask - returns the mask for the specified interrupt source
 220  * @interrupt: the interrupt number
 221  * @mask: returned mask for this interrupt (0=enabled, 1=disabled)
 222  *
 223  * Returns 0 for success, or an error code.
 224  */
 225 static inline unsigned int ev_int_get_mask(unsigned int interrupt,
 226         unsigned int *mask)
 227 {
 228         register uintptr_t r11 __asm__("r11");
 229         register uintptr_t r3 __asm__("r3");
 230         register uintptr_t r4 __asm__("r4");
 231 
 232         r11 = EV_HCALL_TOKEN(EV_INT_GET_MASK);
 233         r3 = interrupt;
 234 
 235         asm volatile("bl        epapr_hypercall_start"
 236                 : "+r" (r11), "+r" (r3), "=r" (r4)
 237                 : : EV_HCALL_CLOBBERS2
 238         );
 239 
 240         *mask = r4;
 241 
 242         return r3;
 243 }
 244 
 245 /**
 246  * ev_int_eoi - signal the end of interrupt processing
 247  * @interrupt: the interrupt number
 248  *
 249  * This function signals the end of processing for the the specified
 250  * interrupt, which must be the interrupt currently in service. By
 251  * definition, this is also the highest-priority interrupt.
 252  *
 253  * Returns 0 for success, or an error code.
 254  */
 255 static inline unsigned int ev_int_eoi(unsigned int interrupt)
 256 {
 257         register uintptr_t r11 __asm__("r11");
 258         register uintptr_t r3 __asm__("r3");
 259 
 260         r11 = EV_HCALL_TOKEN(EV_INT_EOI);
 261         r3 = interrupt;
 262 
 263         asm volatile("bl        epapr_hypercall_start"
 264                 : "+r" (r11), "+r" (r3)
 265                 : : EV_HCALL_CLOBBERS1
 266         );
 267 
 268         return r3;
 269 }
 270 
 271 /**
 272  * ev_byte_channel_send - send characters to a byte stream
 273  * @handle: byte stream handle
 274  * @count: (input) num of chars to send, (output) num chars sent
 275  * @buffer: pointer to a 16-byte buffer
 276  *
 277  * @buffer must be at least 16 bytes long, because all 16 bytes will be
 278  * read from memory into registers, even if count < 16.
 279  *
 280  * Returns 0 for success, or an error code.
 281  */
 282 static inline unsigned int ev_byte_channel_send(unsigned int handle,
 283         unsigned int *count, const char buffer[EV_BYTE_CHANNEL_MAX_BYTES])
 284 {
 285         register uintptr_t r11 __asm__("r11");
 286         register uintptr_t r3 __asm__("r3");
 287         register uintptr_t r4 __asm__("r4");
 288         register uintptr_t r5 __asm__("r5");
 289         register uintptr_t r6 __asm__("r6");
 290         register uintptr_t r7 __asm__("r7");
 291         register uintptr_t r8 __asm__("r8");
 292         const uint32_t *p = (const uint32_t *) buffer;
 293 
 294         r11 = EV_HCALL_TOKEN(EV_BYTE_CHANNEL_SEND);
 295         r3 = handle;
 296         r4 = *count;
 297         r5 = be32_to_cpu(p[0]);
 298         r6 = be32_to_cpu(p[1]);
 299         r7 = be32_to_cpu(p[2]);
 300         r8 = be32_to_cpu(p[3]);
 301 
 302         asm volatile("bl        epapr_hypercall_start"
 303                 : "+r" (r11), "+r" (r3),
 304                   "+r" (r4), "+r" (r5), "+r" (r6), "+r" (r7), "+r" (r8)
 305                 : : EV_HCALL_CLOBBERS6
 306         );
 307 
 308         *count = r4;
 309 
 310         return r3;
 311 }
 312 
 313 /**
 314  * ev_byte_channel_receive - fetch characters from a byte channel
 315  * @handle: byte channel handle
 316  * @count: (input) max num of chars to receive, (output) num chars received
 317  * @buffer: pointer to a 16-byte buffer
 318  *
 319  * The size of @buffer must be at least 16 bytes, even if you request fewer
 320  * than 16 characters, because we always write 16 bytes to @buffer.  This is
 321  * for performance reasons.
 322  *
 323  * Returns 0 for success, or an error code.
 324  */
 325 static inline unsigned int ev_byte_channel_receive(unsigned int handle,
 326         unsigned int *count, char buffer[EV_BYTE_CHANNEL_MAX_BYTES])
 327 {
 328         register uintptr_t r11 __asm__("r11");
 329         register uintptr_t r3 __asm__("r3");
 330         register uintptr_t r4 __asm__("r4");
 331         register uintptr_t r5 __asm__("r5");
 332         register uintptr_t r6 __asm__("r6");
 333         register uintptr_t r7 __asm__("r7");
 334         register uintptr_t r8 __asm__("r8");
 335         uint32_t *p = (uint32_t *) buffer;
 336 
 337         r11 = EV_HCALL_TOKEN(EV_BYTE_CHANNEL_RECEIVE);
 338         r3 = handle;
 339         r4 = *count;
 340 
 341         asm volatile("bl        epapr_hypercall_start"
 342                 : "+r" (r11), "+r" (r3), "+r" (r4),
 343                   "=r" (r5), "=r" (r6), "=r" (r7), "=r" (r8)
 344                 : : EV_HCALL_CLOBBERS6
 345         );
 346 
 347         *count = r4;
 348         p[0] = cpu_to_be32(r5);
 349         p[1] = cpu_to_be32(r6);
 350         p[2] = cpu_to_be32(r7);
 351         p[3] = cpu_to_be32(r8);
 352 
 353         return r3;
 354 }
 355 
 356 /**
 357  * ev_byte_channel_poll - returns the status of the byte channel buffers
 358  * @handle: byte channel handle
 359  * @rx_count: returned count of bytes in receive queue
 360  * @tx_count: returned count of free space in transmit queue
 361  *
 362  * This function reports the amount of data in the receive queue (i.e. the
 363  * number of bytes you can read), and the amount of free space in the transmit
 364  * queue (i.e. the number of bytes you can write).
 365  *
 366  * Returns 0 for success, or an error code.
 367  */
 368 static inline unsigned int ev_byte_channel_poll(unsigned int handle,
 369         unsigned int *rx_count, unsigned int *tx_count)
 370 {
 371         register uintptr_t r11 __asm__("r11");
 372         register uintptr_t r3 __asm__("r3");
 373         register uintptr_t r4 __asm__("r4");
 374         register uintptr_t r5 __asm__("r5");
 375 
 376         r11 = EV_HCALL_TOKEN(EV_BYTE_CHANNEL_POLL);
 377         r3 = handle;
 378 
 379         asm volatile("bl        epapr_hypercall_start"
 380                 : "+r" (r11), "+r" (r3), "=r" (r4), "=r" (r5)
 381                 : : EV_HCALL_CLOBBERS3
 382         );
 383 
 384         *rx_count = r4;
 385         *tx_count = r5;
 386 
 387         return r3;
 388 }
 389 
 390 /**
 391  * ev_int_iack - acknowledge an interrupt
 392  * @handle: handle to the target interrupt controller
 393  * @vector: returned interrupt vector
 394  *
 395  * If handle is zero, the function returns the next interrupt source
 396  * number to be handled irrespective of the hierarchy or cascading
 397  * of interrupt controllers. If non-zero, specifies a handle to the
 398  * interrupt controller that is the target of the acknowledge.
 399  *
 400  * Returns 0 for success, or an error code.
 401  */
 402 static inline unsigned int ev_int_iack(unsigned int handle,
 403         unsigned int *vector)
 404 {
 405         register uintptr_t r11 __asm__("r11");
 406         register uintptr_t r3 __asm__("r3");
 407         register uintptr_t r4 __asm__("r4");
 408 
 409         r11 = EV_HCALL_TOKEN(EV_INT_IACK);
 410         r3 = handle;
 411 
 412         asm volatile("bl        epapr_hypercall_start"
 413                 : "+r" (r11), "+r" (r3), "=r" (r4)
 414                 : : EV_HCALL_CLOBBERS2
 415         );
 416 
 417         *vector = r4;
 418 
 419         return r3;
 420 }
 421 
 422 /**
 423  * ev_doorbell_send - send a doorbell to another partition
 424  * @handle: doorbell send handle
 425  *
 426  * Returns 0 for success, or an error code.
 427  */
 428 static inline unsigned int ev_doorbell_send(unsigned int handle)
 429 {
 430         register uintptr_t r11 __asm__("r11");
 431         register uintptr_t r3 __asm__("r3");
 432 
 433         r11 = EV_HCALL_TOKEN(EV_DOORBELL_SEND);
 434         r3 = handle;
 435 
 436         asm volatile("bl        epapr_hypercall_start"
 437                 : "+r" (r11), "+r" (r3)
 438                 : : EV_HCALL_CLOBBERS1
 439         );
 440 
 441         return r3;
 442 }
 443 
 444 /**
 445  * ev_idle -- wait for next interrupt on this core
 446  *
 447  * Returns 0 for success, or an error code.
 448  */
 449 static inline unsigned int ev_idle(void)
 450 {
 451         register uintptr_t r11 __asm__("r11");
 452         register uintptr_t r3 __asm__("r3");
 453 
 454         r11 = EV_HCALL_TOKEN(EV_IDLE);
 455 
 456         asm volatile("bl        epapr_hypercall_start"
 457                 : "+r" (r11), "=r" (r3)
 458                 : : EV_HCALL_CLOBBERS1
 459         );
 460 
 461         return r3;
 462 }
 463 
 464 #ifdef CONFIG_EPAPR_PARAVIRT
 465 static inline unsigned long epapr_hypercall(unsigned long *in,
 466                             unsigned long *out,
 467                             unsigned long nr)
 468 {
 469         register unsigned long r0 asm("r0");
 470         register unsigned long r3 asm("r3") = in[0];
 471         register unsigned long r4 asm("r4") = in[1];
 472         register unsigned long r5 asm("r5") = in[2];
 473         register unsigned long r6 asm("r6") = in[3];
 474         register unsigned long r7 asm("r7") = in[4];
 475         register unsigned long r8 asm("r8") = in[5];
 476         register unsigned long r9 asm("r9") = in[6];
 477         register unsigned long r10 asm("r10") = in[7];
 478         register unsigned long r11 asm("r11") = nr;
 479         register unsigned long r12 asm("r12");
 480 
 481         asm volatile("bl        epapr_hypercall_start"
 482                      : "=r"(r0), "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6),
 483                        "=r"(r7), "=r"(r8), "=r"(r9), "=r"(r10), "=r"(r11),
 484                        "=r"(r12)
 485                      : "r"(r3), "r"(r4), "r"(r5), "r"(r6), "r"(r7), "r"(r8),
 486                        "r"(r9), "r"(r10), "r"(r11)
 487                      : "memory", "cc", "xer", "ctr", "lr");
 488 
 489         out[0] = r4;
 490         out[1] = r5;
 491         out[2] = r6;
 492         out[3] = r7;
 493         out[4] = r8;
 494         out[5] = r9;
 495         out[6] = r10;
 496         out[7] = r11;
 497 
 498         return r3;
 499 }
 500 #else
 501 static unsigned long epapr_hypercall(unsigned long *in,
 502                                    unsigned long *out,
 503                                    unsigned long nr)
 504 {
 505         return EV_UNIMPLEMENTED;
 506 }
 507 #endif
 508 
 509 static inline long epapr_hypercall0_1(unsigned int nr, unsigned long *r2)
 510 {
 511         unsigned long in[8] = {0};
 512         unsigned long out[8];
 513         unsigned long r;
 514 
 515         r = epapr_hypercall(in, out, nr);
 516         *r2 = out[0];
 517 
 518         return r;
 519 }
 520 
 521 static inline long epapr_hypercall0(unsigned int nr)
 522 {
 523         unsigned long in[8] = {0};
 524         unsigned long out[8];
 525 
 526         return epapr_hypercall(in, out, nr);
 527 }
 528 
 529 static inline long epapr_hypercall1(unsigned int nr, unsigned long p1)
 530 {
 531         unsigned long in[8] = {0};
 532         unsigned long out[8];
 533 
 534         in[0] = p1;
 535         return epapr_hypercall(in, out, nr);
 536 }
 537 
 538 static inline long epapr_hypercall2(unsigned int nr, unsigned long p1,
 539                                     unsigned long p2)
 540 {
 541         unsigned long in[8] = {0};
 542         unsigned long out[8];
 543 
 544         in[0] = p1;
 545         in[1] = p2;
 546         return epapr_hypercall(in, out, nr);
 547 }
 548 
 549 static inline long epapr_hypercall3(unsigned int nr, unsigned long p1,
 550                                     unsigned long p2, unsigned long p3)
 551 {
 552         unsigned long in[8] = {0};
 553         unsigned long out[8];
 554 
 555         in[0] = p1;
 556         in[1] = p2;
 557         in[2] = p3;
 558         return epapr_hypercall(in, out, nr);
 559 }
 560 
 561 static inline long epapr_hypercall4(unsigned int nr, unsigned long p1,
 562                                     unsigned long p2, unsigned long p3,
 563                                     unsigned long p4)
 564 {
 565         unsigned long in[8] = {0};
 566         unsigned long out[8];
 567 
 568         in[0] = p1;
 569         in[1] = p2;
 570         in[2] = p3;
 571         in[3] = p4;
 572         return epapr_hypercall(in, out, nr);
 573 }
 574 #endif /* !__ASSEMBLY__ */
 575 #endif /* _EPAPR_HCALLS_H */
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