| 0,0 → 1,119 |
|---|
| /* |
| * Copyright (c) 2005 Jakub Vana |
| * 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 ia32 |
| * @{ |
| */ |
| /** @file |
| * |
| */ |
| |
| #include <fpu_context.h> |
| #include <arch.h> |
| #include <cpu.h> |
| |
| typedef void (*fpu_context_function)(fpu_context_t *fctx); |
| |
| static fpu_context_function fpu_save, fpu_restore; |
| |
| static void fpu_context_f_save(fpu_context_t *fctx) |
| { |
| asm volatile ( |
| "fnsave %0" |
| : "=m"(*fctx) |
| ); |
| } |
| |
| static void fpu_context_f_restore(fpu_context_t *fctx) |
| { |
| asm volatile ( |
| "frstor %0" |
| : "=m"(*fctx) |
| ); |
| } |
| |
| static void fpu_context_fx_save(fpu_context_t *fctx) |
| { |
| asm volatile ( |
| "fxsave %0" |
| : "=m"(*fctx) |
| ); |
| } |
| |
| static void fpu_context_fx_restore(fpu_context_t *fctx) |
| { |
| asm volatile ( |
| "fxrstor %0" |
| : "=m"(*fctx) |
| ); |
| } |
| |
| /* |
| Setup using fxsr instruction |
| */ |
| void fpu_fxsr(void) |
| { |
| fpu_save=fpu_context_fx_save; |
| fpu_restore=fpu_context_fx_restore; |
| } |
| /* |
| Setup using not fxsr instruction |
| */ |
| void fpu_fsr(void) |
| { |
| fpu_save = fpu_context_f_save; |
| fpu_restore = fpu_context_f_restore; |
| } |
| |
| void fpu_context_save(fpu_context_t *fctx) |
| { |
| fpu_save(fctx); |
| } |
| |
| void fpu_context_restore(fpu_context_t *fctx) |
| { |
| fpu_restore(fctx); |
| } |
| |
| void fpu_init() |
| { |
| uint32_t help0 = 0, help1 = 0; |
| asm volatile ( |
| "fninit;\n" |
| "stmxcsr %0\n" |
| "mov %0,%1;\n" |
| "or %2,%1;\n" |
| "mov %1,%0;\n" |
| "ldmxcsr %0;\n" |
| : "+m" (help0), "+r" (help1) |
| : "i" (0x1f80) |
| ); |
| } |
| |
| /** @} |
| */ |