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#include <syscall/copy.h>
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#include <syscall/copy.h>
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#include <arch.h>
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#include <arch.h>
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#include <align.h>
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#include <align.h>
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#include <errno.h>
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#include <errno.h>
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/** Map piece of physical memory into virtual address space of specified task.
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/** Map piece of physical memory into virtual address space of current task.
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 *
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 *
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 * @param id Task ID of the destination task.
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 * @param pf Physical frame address of the starting frame.
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 * @param pf Physical frame address of the starting frame.
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 * @param vp Virtual page address of the starting page.
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 * @param vp Virtual page address of the starting page.
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 * @param pages Number of pages to map.
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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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 * @param flags Address space area flags for the mapping.
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 *
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 *
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 * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
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 * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall,
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 *     ENOENT if there is no task matching the specified ID and ENOMEM if
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 *     ENOENT if there is no task matching the specified ID and ENOMEM if
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 *     there was a problem in creating address space area.
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 *     there was a problem in creating address space area.
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 */
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 */
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static int ddi_physmem_map(task_id_t id, __address pf, __address vp, count_t pages, int flags)
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static int ddi_physmem_map(__address pf, __address vp, count_t pages, int flags)
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{
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{
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    ipl_t ipl;
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    ipl_t ipl;
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    cap_t caps;
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    cap_t caps;
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    task_t *t;
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    mem_backend_data_t backend_data;
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    mem_backend_data_t backend_data;
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    backend_data.base = pf;
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    backend_data.base = pf;
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    backend_data.frames = pages;
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    backend_data.frames = pages;
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     * Make sure the caller is authorised to make this syscall.
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     * Make sure the caller is authorised to make this syscall.
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     */
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     */
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    caps = cap_get(TASK);
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    caps = cap_get(TASK);
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    if (!(caps & CAP_MEM_MANAGER))
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    if (!(caps & CAP_MEM_MANAGER))
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        return EPERM;
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        return EPERM;
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    ipl = interrupts_disable();
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    spinlock_lock(&tasks_lock);
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    t = task_find_by_id(id);
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    if (!t) {
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        /*
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         * There is no task with the specified ID.
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         */
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        spinlock_unlock(&tasks_lock);
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        interrupts_restore(ipl);
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        return ENOENT;
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    }
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    /*
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     * TODO: We are currently lacking support for task destroying.
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     * Once it is added to the kernel, we must take care to
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    ipl = interrupts_disable();
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     * synchronize in a way that prevents race conditions here.
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     */
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    /* Lock the task and release the lock protecting tasks_btree. */
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    /* Lock the task and release the lock protecting tasks_btree. */
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    spinlock_lock(&t->lock);
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    spinlock_lock(&TASK->lock);
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    spinlock_unlock(&tasks_lock);
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    if (!as_area_create(t->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
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    if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
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        &phys_backend, &backend_data)) {
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        &phys_backend, &backend_data)) {
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        /*
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        /*
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         * The address space area could not have been created.
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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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         * We report it using ENOMEM.
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         */
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         */
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        spinlock_unlock(&t->lock);
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        spinlock_unlock(&TASK->lock);
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        interrupts_restore(ipl);
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        interrupts_restore(ipl);
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        return ENOMEM;
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        return ENOMEM;
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    }
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    }
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    /*
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    /*
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     * Mapping is created on-demand during page fault.
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     * Mapping is created on-demand during page fault.
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     */
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     */
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    spinlock_unlock(&t->lock);
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    spinlock_unlock(&TASK->lock);
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    interrupts_restore(ipl);
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    interrupts_restore(ipl);
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    return 0;
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    return 0;
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}
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}
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/** Enable range of I/O space for task.
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/** Enable range of I/O space for task.
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    return rc;
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    return rc;
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}
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}
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/** Wrapper for SYS_MAP_PHYSMEM syscall.
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/** Wrapper for SYS_MAP_PHYSMEM syscall.
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 *
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 *
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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 User space address of memory DDI argument structure.
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 * @param flags Flags of newly mapped pages
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 *
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 *
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 * @return 0 on success, otherwise it returns error code found in errno.h
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 * @return 0 on success, otherwise it returns error code found in errno.h
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 */
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 */
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__native sys_physmem_map(ddi_memarg_t *uspace_mem_arg)
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__native sys_physmem_map(__native phys_base, __native virt_base, __native pages,
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 165 
             __native flags)
184 
{
 166 
{
185 
    ddi_memarg_t arg;
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186 
    int rc;
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187 
   
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188 
    rc = copy_from_uspace(&arg, uspace_mem_arg, sizeof(ddi_memarg_t));
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    if (rc != 0)
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        return (__native) rc;
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191 
       
 - 
 
192 
    return (__native) ddi_physmem_map((task_id_t) arg.task_id, ALIGN_DOWN((__address) arg.phys_base, FRAME_SIZE),
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    return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE),
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                      ALIGN_DOWN((__address) arg.virt_base, PAGE_SIZE), (count_t) arg.pages,
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                      ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages,
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                      (int) arg.flags);
 169 
                      (int) flags);
195 
}
 170 
}
196 
 
 171 
 
197 
/** Wrapper for SYS_ENABLE_IOSPACE syscall.
 172 
/** Wrapper for SYS_ENABLE_IOSPACE syscall.
198 
 *
 173 
 *
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 * @param User space address of DDI argument structure.
 174 
 * @param User space address of DDI argument structure.