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1191 jermar 1 
/*
2071 jermar 2 
 * Copyright (c) 2006 Jakub Jermar
1191 jermar 3 
 * 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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1731 jermar 29 
/** @addtogroup ia32ddi
1702 cejka 30 
 * @{
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 */
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/** @file
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 */
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1191 jermar 35 
#include <ddi/ddi.h>
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#include <arch/ddi/ddi.h>
1191 jermar 37 
#include <proc/task.h>
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#include <arch/types.h>
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#include <adt/bitmap.h>
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#include <mm/slab.h>
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#include <arch/pm.h>
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#include <errno.h>
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#include <arch/cpu.h>
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#include <cpu.h>
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#include <arch.h>
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#include <align.h>
1191 jermar 47 
 
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/** Enable I/O space range for task.
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 *
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 * Interrupts are disabled and task is locked.
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 *
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 * @param task Task.
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 * @param ioaddr Startign I/O space address.
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 * @param size Size of the enabled I/O range.
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 *
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 * @return 0 on success or an error code from errno.h.
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 */
1780 jermar 58 
int ddi_iospace_enable_arch(task_t *task, uintptr_t ioaddr, size_t size)
1191 jermar 59 
{
1203 jermar 60 
	count_t bits;
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	bits = ioaddr + size;
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	if (bits > IO_PORTS)
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		return ENOENT;
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	if (task->arch.iomap.bits < bits) {
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		bitmap_t oldiomap;
1780 jermar 68 
		uint8_t *newmap;
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		/*
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		 * The I/O permission bitmap is too small and needs to be grown.
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		 */
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1780 jermar 74 
		newmap = (uint8_t *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
1203 jermar 75 
		if (!newmap)
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			return ENOMEM;
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		bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
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		bitmap_initialize(&task->arch.iomap, newmap, bits);
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		/*
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		 * Mark the new range inaccessible.
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		 */
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		bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);
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		/*
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		 * In case there really existed smaller iomap,
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		 * copy its contents and deallocate it.
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		 */
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		if (oldiomap.bits) {
1261 jermar 91 
			bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits);
1203 jermar 92 
			free(oldiomap.map);
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		}
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	}
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	/*
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	 * Enable the range and we are done.
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	 */
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	bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
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1256 jermar 101 
	/*
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	 * Increment I/O Permission bitmap generation counter.
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	 */
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	task->arch.iomapver++;
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1191 jermar 106 
	return 0;
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}
1212 palkovsky 108 
 
1256 jermar 109 
/** Install I/O Permission bitmap.
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 *
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 * Current task's I/O permission bitmap, if any, is installed
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 * in the current CPU's TSS.
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 *
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 * Interrupts must be disabled prior this call.
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 */
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void io_perm_bitmap_install(void)
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{
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	count_t bits;
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	ptr_16_32_t cpugdtr;
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	descriptor_t *gdt_p;
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	count_t ver;
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	/* First, copy the I/O Permission Bitmap. */
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	spinlock_lock(&TASK->lock);
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	ver = TASK->arch.iomapver;
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	if ((bits = TASK->arch.iomap.bits)) {
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		bitmap_t iomap;
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		ASSERT(TASK->arch.iomap.map);
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		bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
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		bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
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		/*
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		 * It is safe to set the trailing eight bits because of the extra
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		 * convenience byte in TSS_IOMAP_SIZE.
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		 */
1263 jermar 136 
		bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);
1256 jermar 137 
	}
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	spinlock_unlock(&TASK->lock);
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1263 jermar 140 
	/*
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	 * Second, adjust TSS segment limit.
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	 * Take the extra ending byte with all bits set into account.
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	 */
1256 jermar 144 
	gdtr_store(&cpugdtr);
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	gdt_p = (descriptor_t *) cpugdtr.base;
1263 jermar 146 
	gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));
1256 jermar 147 
	gdtr_load(&cpugdtr);
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149 
	/*
150 
	 * Before we load new TSS limit, the current TSS descriptor
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	 * type must be changed to describe inactive TSS.
152 
	 */
153 
	gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL;
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	tr_load(selector(TSS_DES));
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156 
	/*
157 
	 * Update the generation count so that faults caused by
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	 * early accesses can be serviced.
159 
	 */
160 
	CPU->arch.iomapver_copy = ver;
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}
1702 cejka 162 
 
1731 jermar 163 
/** @}
1702 cejka 164 
 */