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897 jermar 1 
/*
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 * Copyright (C) 2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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1784 jermar 29 
/** @addtogroup sparc64proc
1702 cejka 30 
 * @{
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 */
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/** @file
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 */
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897 jermar 35 
#include <proc/scheduler.h>
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#include <proc/thread.h>
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#include <arch.h>
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#include <arch/asm.h>
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#include <arch/regdef.h>
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#include <arch/stack.h>
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#include <arch/mm/tlb.h>
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#include <arch/mm/page.h>
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#include <config.h>
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#include <align.h>
1855 jermar 45 
#include <macros.h>
897 jermar 46 
 
1187 jermar 47 
/** Perform sparc64 specific tasks needed before the new task is run. */
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void before_task_runs_arch(void)
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{
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}
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1855 jermar 52 
/** Perform sparc64 specific steps before scheduling a thread.
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 *
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 * Ensure that thread's kernel stack, as well as userspace window buffer for
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 * userspace threads, are locked in DTLB. For userspace threads, initialize
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 * reserved global registers in the alternate and interrupt sets.
1855 jermar 57 
 */
897 jermar 58 
void before_thread_runs_arch(void)
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{
1780 jermar 60 
	uintptr_t base;
897 jermar 61 
 
901 jermar 62 
	base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
897 jermar 63 
 
2049 jermar 64 
	if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 <<
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		KERNEL_PAGE_WIDTH))) {
897 jermar 66 
		/*
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		 * Kernel stack of this thread is not locked in DTLB.
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		 * First, make sure it is not mapped already.
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		 * If not, create a locked mapping for it.
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		 */
2049 jermar 71 
		dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t)
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			THREAD->kstack);
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		dtlb_insert_mapping((uintptr_t) THREAD->kstack,
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			KA2PA(THREAD->kstack), PAGESIZE_8K, true, true);
1855 jermar 75 
	}
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	if ((THREAD->flags & THREAD_FLAG_USPACE)) {
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		/*
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		 * If this thread executes also in userspace, we have to lock
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		 * its userspace window buffer into DTLB.
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		 */
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		ASSERT(THREAD->arch.uspace_window_buffer);
2049 jermar 83 
		uintptr_t uw_buf = ALIGN_DOWN((uintptr_t)
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			THREAD->arch.uspace_window_buffer, PAGE_SIZE);
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		if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH))
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			{
1855 jermar 87 
			/*
2049 jermar 88 
			 * The buffer is not covered by the 4M locked kernel
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			 * DTLB entry.
1855 jermar 90 
			 */
1857 jermar 91 
			dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);
2049 jermar 92 
			dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K,
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				true, true);
1855 jermar 94 
		}
1856 jermar 95 
 
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		/*
2049 jermar 97 
		 * Write kernel stack address to %g6 and a pointer to the last
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		 * item in the userspace window buffer to %g7 in the alternate
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		 * and interrupt sets.
1856 jermar 100 
		 */
1860 jermar 101 
		uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE
2049 jermar 102 
			- (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE,
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			STACK_ALIGNMENT));
1860 jermar 104 
		write_to_ig_g6(sp);
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		write_to_ag_g6(sp);
1856 jermar 106 
		write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
1855 jermar 107 
	}
897 jermar 108 
}
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1855 jermar 110 
/** Perform sparc64 specific steps before a thread stops running.
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 *
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 * Demap any locked DTLB entries isntalled by the thread (i.e. kernel stack
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 * and userspace window buffer).
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 */
897 jermar 115 
void after_thread_ran_arch(void)
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{
1780 jermar 117 
	uintptr_t base;
897 jermar 118 
 
2049 jermar 119 
	base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH);
897 jermar 120 
 
2049 jermar 121 
	if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 <<
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		KERNEL_PAGE_WIDTH))) {
897 jermar 123 
		/*
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		 * Kernel stack of this thread is locked in DTLB.
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		 * Destroy the mapping.
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		 */
2049 jermar 127 
		dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t)
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			THREAD->kstack);
897 jermar 129 
	}
1855 jermar 130 
 
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	if ((THREAD->flags & THREAD_FLAG_USPACE)) {
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		/*
1890 jermar 133 
		 * If this thread executes also in userspace, we have to
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		 * demap the userspace window buffer from DTLB.
1855 jermar 135 
		 */
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		ASSERT(THREAD->arch.uspace_window_buffer);
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2049 jermar 138 
		uintptr_t uw_buf = ALIGN_DOWN((uintptr_t)
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			THREAD->arch.uspace_window_buffer, PAGE_SIZE);
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		if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) {
1855 jermar 141 
			/*
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			 * The buffer is not covered by the 4M locked kernel DTLB entry
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			 * and therefore it was given a dedicated locked DTLB entry.
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			 * Demap it.
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			 */
1857 jermar 146 
			dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);
1855 jermar 147 
		}
1856 jermar 148 
 
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		/* sample the state of the userspace window buffer */
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		THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();
1855 jermar 151 
	}
897 jermar 152 
}
1702 cejka 153 
 
1784 jermar 154 
/** @}
1702 cejka 155 
 */