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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>
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#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
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 * buffer for userspace threads, are locked in DTLB.
1856 jermar 56 
 * For userspace threads, initialize reserved global registers
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 * in the alternate and interrupt sets.
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 */
897 jermar 59 
void before_thread_runs_arch(void)
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{
1780 jermar 61 
	uintptr_t base;
897 jermar 62 
 
901 jermar 63 
	base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
897 jermar 64 
 
1855 jermar 65 
	if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1<<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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		 */
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		dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) THREAD->kstack);
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		dtlb_insert_mapping((uintptr_t) THREAD->kstack, KA2PA(THREAD->kstack), PAGESIZE_8K, true, true);
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	}
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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);
1857 jermar 81 
		uintptr_t uw_buf = ALIGN_DOWN((uintptr_t) THREAD->arch.uspace_window_buffer, PAGE_SIZE);
1855 jermar 82 
		if (!overlaps(uw_buf, PAGE_SIZE, base, 1<<KERNEL_PAGE_WIDTH)) {
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			/*
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			 * The buffer is not covered by the 4M locked kernel DTLB entry.
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			 */
1857 jermar 86 
			dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);
1855 jermar 87 
			dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K, true, true);
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		}
1856 jermar 89 
 
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		/*
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		 * Write kernel stack address to %g6 and a pointer to the last item
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		 * in the userspace window buffer to %g7 in the alternate and interrupt sets.
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		 */
1860 jermar 94 
		uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE
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			- (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT));
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		write_to_ig_g6(sp);
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		write_to_ag_g6(sp);
1856 jermar 98 
		write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
1855 jermar 99 
	}
897 jermar 100 
}
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1855 jermar 102 
/** 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 107 
void after_thread_ran_arch(void)
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{
1780 jermar 109 
	uintptr_t base;
897 jermar 110 
 
901 jermar 111 
	base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
897 jermar 112 
 
1855 jermar 113 
	if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1<<KERNEL_PAGE_WIDTH))) {
897 jermar 114 
		/*
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		 * Kernel stack of this thread is locked in DTLB.
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		 * Destroy the mapping.
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		 */
1780 jermar 118 
		dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) THREAD->kstack);
897 jermar 119 
	}
1855 jermar 120 
 
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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 force all
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		 * its still-active userspace windows into the userspace window buffer
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		 * and demap the buffer from DTLB.
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		 */
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		ASSERT(THREAD->arch.uspace_window_buffer);
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		flushw();	/* force all userspace windows into memory */
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1857 jermar 131 
		uintptr_t uw_buf = ALIGN_DOWN((uintptr_t) THREAD->arch.uspace_window_buffer, PAGE_SIZE);
1855 jermar 132 
		if (!overlaps(uw_buf, PAGE_SIZE, base, 1<<KERNEL_PAGE_WIDTH)) {
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			/*
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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 138 
			dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);
1855 jermar 139 
		}
1856 jermar 140 
 
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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 143 
	}
897 jermar 144 
}
1702 cejka 145 
 
1784 jermar 146 
/** @}
1702 cejka 147 
 */