Subversion Repositories HelenOS

Rev

Rev 2465 | Rev 4346 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2162 stepan 1 
/*
2245 stepan 2 
 * Copyright (c) 2007 Petr Stepan
2162 stepan 3 
 * All rights reserved.
4 
 *
5 
 * Redistribution and use in source and binary forms, with or without
6 
 * modification, are permitted provided that the following conditions
7 
 * are met:
8 
 *
9 
 * - Redistributions of source code must retain the above copyright
10 
 *   notice, this list of conditions and the following disclaimer.
11 
 * - Redistributions in binary form must reproduce the above copyright
12 
 *   notice, this list of conditions and the following disclaimer in the
13 
 *   documentation and/or other materials provided with the distribution.
14 
 * - The name of the author may not be used to endorse or promote products
15 
 *   derived from this software without specific prior written permission.
16 
 *
17 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
 */
28 
 
29 
/** @addtogroup arm32
30 
 * @{
31 
 */
32 
/** @file
2410 stepan 33 
 *  @brief Interrupts controlling routines.
2162 stepan 34 
 */
35 
 
2214 kebrt 36 
#include <arch/asm.h>
37 
#include <arch/regutils.h>
2245 stepan 38 
#include <ddi/irq.h>
2274 kebrt 39 
#include <arch/machine.h>
2214 kebrt 40 
#include <interrupt.h>
2162 stepan 41 
 
2407 stepan 42 
/** Initial size of a table holding interrupt handlers. */
2245 stepan 43 
#define IRQ_COUNT 8
2162 stepan 44 
 
45 
/** Disable interrupts.
46 
 *
47 
 * @return Old interrupt priority level.
48 
 */
49 
ipl_t interrupts_disable(void)
50 
{
2177 stepan 51 
    ipl_t ipl = current_status_reg_read();
2162 stepan 52 
 
2312 stepan 53 
    current_status_reg_control_write(STATUS_REG_IRQ_DISABLED_BIT | ipl);
2162 stepan 54 
 
55 
    return ipl;
56 
}
57 
 
58 
/** Enable interrupts.
59 
 *
60 
 * @return Old interrupt priority level.
61 
 */
62 
ipl_t interrupts_enable(void)
63 
{
2177 stepan 64 
    ipl_t ipl = current_status_reg_read();
2162 stepan 65 
 
2312 stepan 66 
    current_status_reg_control_write(ipl & ~STATUS_REG_IRQ_DISABLED_BIT);
2162 stepan 67 
 
68 
    return ipl;
69 
}
70 
 
71 
/** Restore interrupt priority level.
72 
 *
73 
 * @param ipl Saved interrupt priority level.
74 
 */
75 
void interrupts_restore(ipl_t ipl)
76 
{
2343 stepan 77 
    current_status_reg_control_write(
2464 jermar 78 
        (current_status_reg_read() & ~STATUS_REG_IRQ_DISABLED_BIT) |
79 
        (ipl & STATUS_REG_IRQ_DISABLED_BIT));
2162 stepan 80 
}
81 
 
82 
/** Read interrupt priority level.
83 
 *
84 
 * @return Current interrupt priority level.
85 
 */
86 
ipl_t interrupts_read(void)
87 
{
2177 stepan 88 
    return current_status_reg_read();
2162 stepan 89 
}
90 
 
2245 stepan 91 
/** Initialize basic tables for exception dispatching
92 
 * and starts the timer.
93 
 */
94 
void interrupt_init(void)
95 
{
2214 kebrt 96 
    irq_init(IRQ_COUNT, IRQ_COUNT);
2274 kebrt 97 
    machine_timer_irq_start();
2214 kebrt 98 
}
99 
 
2162 stepan 100 
/** @}
101 
 */