fpu_helper.c (1760B)
1 /* 2 * x86 FPU, MMX/3DNow!/SSE/SSE2/SSE3/SSSE3/SSE4/PNI helpers (sysemu code) 3 * 4 * Copyright (c) 2003 Fabrice Bellard 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "qemu/osdep.h" 21 #include "cpu.h" 22 #include "hw/irq.h" 23 24 static qemu_irq ferr_irq; 25 26 void x86_register_ferr_irq(qemu_irq irq) 27 { 28 ferr_irq = irq; 29 } 30 31 void fpu_check_raise_ferr_irq(CPUX86State *env) 32 { 33 if (ferr_irq && !(env->hflags2 & HF2_IGNNE_MASK)) { 34 qemu_irq_raise(ferr_irq); 35 return; 36 } 37 } 38 39 void cpu_clear_ignne(void) 40 { 41 CPUX86State *env = &X86_CPU(first_cpu)->env; 42 env->hflags2 &= ~HF2_IGNNE_MASK; 43 } 44 45 void cpu_set_ignne(void) 46 { 47 CPUX86State *env = &X86_CPU(first_cpu)->env; 48 env->hflags2 |= HF2_IGNNE_MASK; 49 /* 50 * We get here in response to a write to port F0h. The chipset should 51 * deassert FP_IRQ and FERR# instead should stay signaled until FPSW_SE is 52 * cleared, because FERR# and FP_IRQ are two separate pins on real 53 * hardware. However, we don't model FERR# as a qemu_irq, so we just 54 * do directly what the chipset would do, i.e. deassert FP_IRQ. 55 */ 56 qemu_irq_lower(ferr_irq); 57 }