0,0 → 1,208 |
/* |
* 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 genericddi |
* @{ |
*/ |
|
/** |
* @file |
* @brief Device Driver Interface functions. |
* |
* This file contains functions that comprise the Device Driver Interface. |
* These are the functions for mapping physical memory and enabling I/O |
* space to tasks. |
*/ |
|
#include <ddi/ddi.h> |
#include <ddi/ddi_arg.h> |
#include <proc/task.h> |
#include <security/cap.h> |
#include <mm/frame.h> |
#include <mm/as.h> |
#include <synch/spinlock.h> |
#include <syscall/copy.h> |
#include <arch.h> |
#include <align.h> |
#include <errno.h> |
|
/** Map piece of physical memory into virtual address space of current task. |
* |
* @param pf Physical frame address of the starting frame. |
* @param vp Virtual page address of the starting page. |
* @param pages Number of pages to map. |
* @param flags Address space area flags for the mapping. |
* |
* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
* ENOENT if there is no task matching the specified ID and ENOMEM if |
* there was a problem in creating address space area. |
*/ |
static int ddi_physmem_map(__address pf, __address vp, count_t pages, int flags) |
{ |
ipl_t ipl; |
cap_t caps; |
mem_backend_data_t backend_data; |
|
backend_data.base = pf; |
backend_data.frames = pages; |
|
/* |
* Make sure the caller is authorised to make this syscall. |
*/ |
caps = cap_get(TASK); |
if (!(caps & CAP_MEM_MANAGER)) |
return EPERM; |
|
ipl = interrupts_disable(); |
spinlock_lock(&TASK->lock); |
|
if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE, |
&phys_backend, &backend_data)) { |
/* |
* The address space area could not have been created. |
* We report it using ENOMEM. |
*/ |
spinlock_unlock(&TASK->lock); |
interrupts_restore(ipl); |
return ENOMEM; |
} |
|
/* |
* Mapping is created on-demand during page fault. |
*/ |
|
spinlock_unlock(&TASK->lock); |
interrupts_restore(ipl); |
return 0; |
} |
|
/** Enable range of I/O space for task. |
* |
* @param id Task ID of the destination task. |
* @param ioaddr Starting I/O address. |
* @param size Size of the enabled I/O space.. |
* |
* @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
* ENOENT if there is no task matching the specified ID. |
*/ |
static int ddi_iospace_enable(task_id_t id, __address ioaddr, size_t size) |
{ |
ipl_t ipl; |
cap_t caps; |
task_t *t; |
int rc; |
|
/* |
* Make sure the caller is authorised to make this syscall. |
*/ |
caps = cap_get(TASK); |
if (!(caps & CAP_IO_MANAGER)) |
return EPERM; |
|
ipl = interrupts_disable(); |
spinlock_lock(&tasks_lock); |
|
t = task_find_by_id(id); |
|
if (!t) { |
/* |
* There is no task with the specified ID. |
*/ |
spinlock_unlock(&tasks_lock); |
interrupts_restore(ipl); |
return ENOENT; |
} |
|
/* Lock the task and release the lock protecting tasks_btree. */ |
spinlock_lock(&t->lock); |
spinlock_unlock(&tasks_lock); |
|
rc = ddi_iospace_enable_arch(t, ioaddr, size); |
|
spinlock_unlock(&t->lock); |
interrupts_restore(ipl); |
return rc; |
} |
|
/** Wrapper for SYS_MAP_PHYSMEM syscall. |
* |
* @param phys_base Physical base address to map |
* @param virt_base Destination virtual address |
* @param pages Number of pages |
* @param flags Flags of newly mapped pages |
* |
* @return 0 on success, otherwise it returns error code found in errno.h |
*/ |
__native sys_physmem_map(__native phys_base, __native virt_base, __native pages, |
__native flags) |
{ |
return (__native) ddi_physmem_map(ALIGN_DOWN((__address) phys_base, FRAME_SIZE), |
ALIGN_DOWN((__address) virt_base, PAGE_SIZE), (count_t) pages, |
(int) flags); |
} |
|
/** Wrapper for SYS_ENABLE_IOSPACE syscall. |
* |
* @param uspace_io_arg User space address of DDI argument structure. |
* |
* @return 0 on success, otherwise it returns error code found in errno.h |
*/ |
__native sys_iospace_enable(ddi_ioarg_t *uspace_io_arg) |
{ |
ddi_ioarg_t arg; |
int rc; |
|
rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t)); |
if (rc != 0) |
return (__native) rc; |
|
return (__native) ddi_iospace_enable((task_id_t) arg.task_id, (__address) arg.ioaddr, (size_t) arg.size); |
} |
|
/** Disable or enable preemption. |
* |
* @param enable If non-zero, the preemption counter will be decremented, leading to potential |
* enabling of preemption. Otherwise the preemption counter will be incremented, |
* preventing preemption from occurring. |
* |
* @return Zero on success or EPERM if callers capabilities are not sufficient. |
*/ |
__native sys_preempt_control(int enable) |
{ |
if (! cap_get(TASK) & CAP_PREEMPT_CONTROL) |
return EPERM; |
if (enable) |
preemption_enable(); |
else |
preemption_disable(); |
return 0; |
} |
|
/** @} |
*/ |
|