source: mainline/kernel/arch/ia64/include/context.h@ a31aad1

/*
 * Copyright (c) 2005 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup ia64    
 * @{
 */
/** @file
 */

#ifndef KERN_ia64_CONTEXT_H_
#define KERN_ia64_CONTEXT_H_

#include <typedefs.h>
#include <arch/register.h>
#include <align.h>
#include <arch/stack.h>

/*
 * context_save_arch() and context_restore_arch() are both leaf procedures.
 * No need to allocate scratch area.
 *
 * One item is put onto the stack to support get_stack_base().
 */
#define SP_DELTA        (0 + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT))

/* RSE stack starts at the bottom of memory stack, hence the division by 2. */
#define context_set(c, _pc, stack, size)                                                                \
        do {                                                                                            \
                (c)->pc = (uintptr_t) _pc;                                                              \
                (c)->bsp = ((uintptr_t) stack) + ALIGN_UP((size / 2), REGISTER_STACK_ALIGNMENT);        \
                (c)->ar_pfs &= PFM_MASK;                                                                \
                (c)->sp = ((uintptr_t) stack) + ALIGN_UP((size / 2), STACK_ALIGNMENT) - SP_DELTA;       \
        } while (0);

/*
 * Only save registers that must be preserved across
 * function calls.
 */
typedef struct {

        /*
         * Application registers
         */
        uint64_t ar_pfs;
        uint64_t ar_unat_caller;
        uint64_t ar_unat_callee;
        uint64_t ar_rsc;
        uintptr_t bsp;          /* ar_bsp */
        uint64_t ar_rnat;
        uint64_t ar_lc;

        /*
         * General registers
         */
        uint64_t r1;
        uint64_t r4;
        uint64_t r5;
        uint64_t r6;
        uint64_t r7;
        uintptr_t sp;           /* r12 */
        uint64_t r13;
        
        /*
         * Branch registers
         */
        uintptr_t pc;           /* b0 */
        uint64_t b1;
        uint64_t b2;
        uint64_t b3;
        uint64_t b4;
        uint64_t b5;

        /*
         * Predicate registers
         */
        uint64_t pr;

        uint128_t f2 __attribute__ ((aligned(16)));
        uint128_t f3;
        uint128_t f4;
        uint128_t f5;

        uint128_t f16;
        uint128_t f17;
        uint128_t f18;
        uint128_t f19;
        uint128_t f20;
        uint128_t f21;
        uint128_t f22;
        uint128_t f23;
        uint128_t f24;
        uint128_t f25;
        uint128_t f26;
        uint128_t f27;
        uint128_t f28;
        uint128_t f29;
        uint128_t f30;
        uint128_t f31;
        
        ipl_t ipl;
} context_t;

#endif

/** @}
 */