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* Copyright (c) 2006 Jakub Jermar
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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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* - 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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* 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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/** @addtogroup genericddi
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* @brief Device Driver Interface functions.
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* This file contains functions that comprise the Device Driver Interface.
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* These are the functions for mapping physical memory and enabling I/O
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#include <ddi/ddi_arg.h>
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#include <proc/task.h>
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#include <security/cap.h>
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#include <synch/spinlock.h>
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#include <syscall/copy.h>
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#include <adt/btree.h>
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/** This lock protects the parea_btree. */
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SPINLOCK_INITIALIZE(parea_lock);
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/** B+tree with enabled physical memory areas. */
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static btree_t parea_btree;
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/** Initialize DDI. */
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btree_create(&parea_btree);
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/** Enable piece of physical memory for mapping by physmem_map().
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* @param parea Pointer to physical area structure.
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void ddi_parea_register(parea_t *parea)
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ipl_t ipl = interrupts_disable();
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spinlock_lock(&parea_lock);
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* We don't check for overlaps here as the kernel is pretty sane.
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btree_insert(&parea_btree, (btree_key_t) parea->pbase, parea, NULL);
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spinlock_unlock(&parea_lock);
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interrupts_restore(ipl);
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/** Map piece of physical memory into virtual address space of current task.
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* @param pf Physical address of the starting frame.
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* @param vp Virtual address of the starting page.
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* @param pages Number of pages to map.
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* @param flags Address space area flags for the mapping.
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* @return 0 on success, EPERM if the caller lacks capabilities to use this
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* syscall, EBADMEM if pf or vf is not page aligned, ENOENT if there
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* is no task matching the specified ID or the physical address space
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* is not enabled for mapping and ENOMEM if there was a problem in
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* creating address space area.
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static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, size_t pages, int flags)
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ASSERT((pf % FRAME_SIZE) == 0);
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ASSERT((vp % PAGE_SIZE) == 0);
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* Make sure the caller is authorised to make this syscall.
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cap_t caps = cap_get(TASK);
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if (!(caps & CAP_MEM_MANAGER))
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mem_backend_data_t backend_data;
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backend_data.base = pf;
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backend_data.frames = pages;
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ipl_t ipl = interrupts_disable();
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/* Find the zone of the physical memory */
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spinlock_lock(&zones.lock);
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size_t znum = find_zone(ADDR2PFN(pf), pages, 0);
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if (znum == (size_t) -1) {
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/* Frames not found in any zones
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* -> assume it is hardware device and allow mapping
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spinlock_unlock(&zones.lock);
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if (zones.info[znum].flags & ZONE_FIRMWARE) {
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/* Frames are part of firmware */
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spinlock_unlock(&zones.lock);
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if (zone_flags_available(zones.info[znum].flags)) {
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/* Frames are part of physical memory, check if the memory
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* region is enabled for mapping.
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spinlock_unlock(&zones.lock);
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spinlock_lock(&parea_lock);
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parea_t *parea = (parea_t *) btree_search(&parea_btree,
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(btree_key_t) pf, &nodep);
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if ((!parea) || (parea->frames < pages))
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spinlock_unlock(&parea_lock);
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spinlock_unlock(&zones.lock);
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interrupts_restore(ipl);
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spinlock_lock(&TASK->lock);
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if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp,
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AS_AREA_ATTR_NONE, &phys_backend, &backend_data)) {
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* The address space area could not have been created.
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* We report it using ENOMEM.
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spinlock_unlock(&TASK->lock);
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interrupts_restore(ipl);
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* Mapping is created on-demand during page fault.
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spinlock_unlock(&TASK->lock);
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interrupts_restore(ipl);
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/** Enable range of I/O space for task.
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* @param id Task ID of the destination task.
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* @param ioaddr Starting I/O address.
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* @param size Size of the enabled I/O space..
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* @return 0 on success, EPERM if the caller lacks capabilities to use this
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* syscall, ENOENT if there is no task matching the specified ID.
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static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size)
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* Make sure the caller is authorised to make this syscall.
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cap_t caps = cap_get(TASK);
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if (!(caps & CAP_IO_MANAGER))
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ipl_t ipl = interrupts_disable();
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spinlock_lock(&tasks_lock);
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task_t *task = task_find_by_id(id);
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if ((!task) || (!context_check(CONTEXT, task->context))) {
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* There is no task with the specified ID
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* or the task belongs to a different security
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spinlock_unlock(&tasks_lock);
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interrupts_restore(ipl);
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/* Lock the task and release the lock protecting tasks_btree. */
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spinlock_lock(&task->lock);
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spinlock_unlock(&tasks_lock);
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int rc = ddi_iospace_enable_arch(task, ioaddr, size);
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spinlock_unlock(&task->lock);
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interrupts_restore(ipl);
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/** Wrapper for SYS_PHYSMEM_MAP syscall.
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* @param phys_base Physical base address to map
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* @param virt_base Destination virtual address
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* @param pages Number of pages
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* @param flags Flags of newly mapped pages
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* @return 0 on success, otherwise it returns error code found in errno.h
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unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base,
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unative_t pages, unative_t flags)
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return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base,
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FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),
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(size_t) pages, (int) flags);
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/** Wrapper for SYS_ENABLE_IOSPACE syscall.
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* @param uspace_io_arg User space address of DDI argument structure.
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* @return 0 on success, otherwise it returns error code found in errno.h
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unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
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int rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
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return (unative_t) rc;
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return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id,
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(uintptr_t) arg.ioaddr, (size_t) arg.size);
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/** Disable or enable preemption.
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* @param enable If non-zero, the preemption counter will be decremented,
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* leading to potential enabling of preemption. Otherwise
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* the preemption counter will be incremented, preventing
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* preemption from occurring.
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* @return Zero on success or EPERM if callers capabilities are not sufficient.
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unative_t sys_preempt_control(int enable)
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if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)
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preemption_disable();