0,0 → 1,83 |
/* |
* Copyright (c) 2006 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 sparc64proc |
* @{ |
*/ |
/** @file |
*/ |
|
#include <proc/scheduler.h> |
#include <proc/thread.h> |
#include <arch.h> |
#include <arch/asm.h> |
#include <arch/stack.h> |
|
/** Perform sparc64 specific tasks needed before the new task is run. */ |
void before_task_runs_arch(void) |
{ |
} |
|
/** Perform sparc64 specific steps before scheduling a thread. |
* |
* For userspace threads, initialize reserved global registers in the alternate |
* and interrupt sets. |
*/ |
void before_thread_runs_arch(void) |
{ |
if ((THREAD->flags & THREAD_FLAG_USPACE)) { |
/* |
* Write kernel stack address to %g6 of the alternate and |
* interrupt global sets. |
* |
* Write pointer to the last item in the userspace window buffer |
* to %g7 in the alternate set. Write to the interrupt %g7 is |
* not necessary because: |
* - spill traps operate only in the alternate global set, |
* - preemptible trap handler switches to alternate globals |
* before it explicitly uses %g7. |
*/ |
uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE - |
(STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT)); |
write_to_ig_g6(sp); |
write_to_ag_g6(sp); |
write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer); |
} |
} |
|
/** Perform sparc64 specific steps before a thread stops running. */ |
void after_thread_ran_arch(void) |
{ |
if ((THREAD->flags & THREAD_FLAG_USPACE)) { |
/* sample the state of the userspace window buffer */ |
THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7(); |
} |
} |
|
/** @} |
*/ |