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  1. /*
  2.  * Copyright (c) 2005 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - 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.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup ia64   
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_ia64_CONTEXT_H_
  36. #define KERN_ia64_CONTEXT_H_
  37.  
  38. #include <arch/types.h>
  39. #include <arch/register.h>
  40. #include <typedefs.h>
  41. #include <align.h>
  42. #include <arch/stack.h>
  43.  
  44. /*
  45.  * context_save_arch() and context_restore_arch() are both leaf procedures.
  46.  * No need to allocate scratch area.
  47.  *
  48.  * One item is put onto the stack to support get_stack_base().
  49.  */
  50. #define SP_DELTA    (0+ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT))
  51.  
  52. #ifdef context_set
  53. #undef context_set
  54. #endif
  55.  
  56. /* RSE stack starts at the bottom of memory stack. */
  57. #define context_set(c, _pc, stack, size)                                \
  58.     do {                                                \
  59.         (c)->pc = (uintptr_t) _pc;                              \
  60.         (c)->bsp = ((uintptr_t) stack) + ALIGN_UP((size), REGISTER_STACK_ALIGNMENT);        \
  61.         (c)->ar_pfs &= PFM_MASK;                                \
  62.         (c)->sp = ((uintptr_t) stack) + ALIGN_UP((size), STACK_ALIGNMENT) - SP_DELTA;       \
  63.     } while (0);
  64.  
  65. /*
  66.  * Only save registers that must be preserved across
  67.  * function calls.
  68.  */
  69. typedef struct {
  70.  
  71.     /*
  72.      * Application registers
  73.      */
  74.     uint64_t ar_pfs;
  75.     uint64_t ar_unat_caller;
  76.     uint64_t ar_unat_callee;
  77.     uint64_t ar_rsc;
  78.     uintptr_t bsp;      /* ar_bsp */
  79.     uint64_t ar_rnat;
  80.     uint64_t ar_lc;
  81.  
  82.     /*
  83.      * General registers
  84.      */
  85.     uint64_t r1;
  86.     uint64_t r4;
  87.     uint64_t r5;
  88.     uint64_t r6;
  89.     uint64_t r7;
  90.     uintptr_t sp;       /* r12 */
  91.     uint64_t r13;
  92.    
  93.     /*
  94.      * Branch registers
  95.      */
  96.     uintptr_t pc;       /* b0 */
  97.     uint64_t b1;
  98.     uint64_t b2;
  99.     uint64_t b3;
  100.     uint64_t b4;
  101.     uint64_t b5;
  102.  
  103.     /*
  104.      * Predicate registers
  105.      */
  106.     uint64_t pr;
  107.  
  108.     __r128 f2 __attribute__ ((aligned(16)));
  109.     __r128 f3;
  110.     __r128 f4;
  111.     __r128 f5;
  112.  
  113.     __r128 f16;
  114.     __r128 f17;
  115.     __r128 f18;
  116.     __r128 f19;
  117.     __r128 f20;
  118.     __r128 f21;
  119.     __r128 f22;
  120.     __r128 f23;
  121.     __r128 f24;
  122.     __r128 f25;
  123.     __r128 f26;
  124.     __r128 f27;
  125.     __r128 f28;
  126.     __r128 f29;
  127.     __r128 f30;
  128.     __r128 f31;
  129.    
  130.     ipl_t ipl;
  131. } context_t;
  132.  
  133. #endif
  134.  
  135. /** @}
  136.  */
  137.