| 1 | /*
|
|---|
| 2 | * Copyright (C) 2005 Jakub Vana
|
|---|
| 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 |
|
|---|
| 30 | #include <fpu_context.h>
|
|---|
| 31 | #include <arch.h>
|
|---|
| 32 | #include <arch/cp0.h>
|
|---|
| 33 | #include <proc/thread.h>
|
|---|
| 34 |
|
|---|
| 35 | void fpu_disable(void)
|
|---|
| 36 | {
|
|---|
| 37 | #ifdef ARCH_HAS_FPU
|
|---|
| 38 | cp0_status_write(cp0_status_read() & ~cp0_status_fpu_bit);
|
|---|
| 39 | if (THREAD && THREAD->istate)
|
|---|
| 40 | THREAD->istate->status &= ~cp0_status_fpu_bit;
|
|---|
| 41 | #endif
|
|---|
| 42 | }
|
|---|
| 43 |
|
|---|
| 44 | void fpu_enable(void)
|
|---|
| 45 | {
|
|---|
| 46 | #ifdef ARCH_HAS_FPU
|
|---|
| 47 | cp0_status_write(cp0_status_read() | cp0_status_fpu_bit);
|
|---|
| 48 | if (THREAD && THREAD->istate)
|
|---|
| 49 | THREAD->istate->status |= cp0_status_fpu_bit;
|
|---|
| 50 | #endif
|
|---|
| 51 | }
|
|---|
| 52 |
|
|---|
| 53 | void fpu_init()
|
|---|
| 54 | {
|
|---|
| 55 | /* TODO: Zero all registers */
|
|---|
| 56 | }
|
|---|
