| 0,0 → 1,169 |
|---|
| /* |
| * 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 amd64ddi |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| #include <ddi/ddi.h> |
| #include <arch/ddi/ddi.h> |
| #include <proc/task.h> |
| #include <arch/types.h> |
| #include <adt/bitmap.h> |
| #include <mm/slab.h> |
| #include <arch/pm.h> |
| #include <errno.h> |
| #include <arch/cpu.h> |
| #include <arch.h> |
| #include <align.h> |
| |
| /** Enable I/O space range for task. |
| * |
| * Interrupts are disabled and task is locked. |
| * |
| * @param task Task. |
| * @param ioaddr Startign I/O space address. |
| * @param size Size of the enabled I/O range. |
| * |
| * @return 0 on success or an error code from errno.h. |
| */ |
| int ddi_iospace_enable_arch(task_t *task, uintptr_t ioaddr, size_t size) |
| { |
| count_t bits; |
| |
| bits = ioaddr + size; |
| if (bits > IO_PORTS) |
| return ENOENT; |
| |
| if (task->arch.iomap.bits < bits) { |
| bitmap_t oldiomap; |
| uint8_t *newmap; |
| |
| /* |
| * The I/O permission bitmap is too small and needs to be grown. |
| */ |
| |
| newmap = (uint8_t *) malloc(BITS2BYTES(bits), FRAME_ATOMIC); |
| if (!newmap) |
| return ENOMEM; |
| |
| bitmap_initialize(&oldiomap, task->arch.iomap.map, |
| task->arch.iomap.bits); |
| bitmap_initialize(&task->arch.iomap, newmap, bits); |
| |
| /* |
| * Mark the new range inaccessible. |
| */ |
| bitmap_set_range(&task->arch.iomap, oldiomap.bits, |
| bits - oldiomap.bits); |
| |
| /* |
| * In case there really existed smaller iomap, |
| * copy its contents and deallocate it. |
| */ |
| if (oldiomap.bits) { |
| bitmap_copy(&task->arch.iomap, &oldiomap, |
| oldiomap.bits); |
| free(oldiomap.map); |
| } |
| } |
| |
| /* |
| * Enable the range and we are done. |
| */ |
| bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size); |
| |
| /* |
| * Increment I/O Permission bitmap generation counter. |
| */ |
| task->arch.iomapver++; |
| |
| return 0; |
| } |
| |
| /** Install I/O Permission bitmap. |
| * |
| * Current task's I/O permission bitmap, if any, is installed |
| * in the current CPU's TSS. |
| * |
| * Interrupts must be disabled prior this call. |
| */ |
| void io_perm_bitmap_install(void) |
| { |
| count_t bits; |
| ptr_16_64_t cpugdtr; |
| descriptor_t *gdt_p; |
| tss_descriptor_t *tss_desc; |
| count_t ver; |
| |
| /* First, copy the I/O Permission Bitmap. */ |
| spinlock_lock(&TASK->lock); |
| ver = TASK->arch.iomapver; |
| if ((bits = TASK->arch.iomap.bits)) { |
| bitmap_t iomap; |
| |
| ASSERT(TASK->arch.iomap.map); |
| bitmap_initialize(&iomap, CPU->arch.tss->iomap, |
| TSS_IOMAP_SIZE * 8); |
| bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits); |
| /* |
| * It is safe to set the trailing eight bits because of the |
| * extra convenience byte in TSS_IOMAP_SIZE. |
| */ |
| bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8); |
| } |
| spinlock_unlock(&TASK->lock); |
| |
| /* |
| * Second, adjust TSS segment limit. |
| * Take the extra ending byte will all bits set into account. |
| */ |
| gdtr_store(&cpugdtr); |
| gdt_p = (descriptor_t *) cpugdtr.base; |
| gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits)); |
| gdtr_load(&cpugdtr); |
| |
| /* |
| * Before we load new TSS limit, the current TSS descriptor |
| * type must be changed to describe inactive TSS. |
| */ |
| tss_desc = (tss_descriptor_t *) &gdt_p[TSS_DES]; |
| tss_desc->type = AR_TSS; |
| tr_load(gdtselector(TSS_DES)); |
| |
| /* |
| * Update the generation count so that faults caused by |
| * early accesses can be serviced. |
| */ |
| CPU->arch.iomapver_copy = ver; |
| } |
| |
| /** @} |
| */ |