/* * 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 kernel_sparc64_proc * @{ */ /** @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->uspace) { uint64_t sp; /* * 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. */ sp = (uintptr_t) THREAD->kstack + STACK_SIZE - STACK_BIAS; 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->uspace) { asm volatile ("flushw"); /* sample the state of the userspace window buffer */ THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7(); } } /** @} */