198a2d214f
It's either "GNU *Library* General Public License version 2" or "GNU Lesser General Public License version *2.1*", but there was no "version 2.0" of the "Lesser" license. So assume that version 2.1 is meant here. Acked-by: Stafford Horne <shorne@gmail.com> Message-Id: <1550073577-4248-1-git-send-email-thuth@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
/*
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* OpenRISC interrupt.
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*
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* Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "exec/exec-all.h"
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#include "qemu-common.h"
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#include "exec/gdbstub.h"
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#include "qemu/host-utils.h"
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#ifndef CONFIG_USER_ONLY
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#include "hw/loader.h"
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#endif
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void openrisc_cpu_do_interrupt(CPUState *cs)
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{
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#ifndef CONFIG_USER_ONLY
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OpenRISCCPU *cpu = OPENRISC_CPU(cs);
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CPUOpenRISCState *env = &cpu->env;
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int exception = cs->exception_index;
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env->epcr = env->pc;
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if (exception == EXCP_SYSCALL) {
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env->epcr += 4;
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}
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/* When we have an illegal instruction the error effective address
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shall be set to the illegal instruction address. */
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if (exception == EXCP_ILLEGAL) {
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env->eear = env->pc;
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}
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/* During exceptions esr is populared with the pre-exception sr. */
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env->esr = cpu_get_sr(env);
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/* In parallel sr is updated to disable mmu, interrupts, timers and
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set the delay slot exception flag. */
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env->sr &= ~SR_DME;
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env->sr &= ~SR_IME;
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env->sr |= SR_SM;
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env->sr &= ~SR_IEE;
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env->sr &= ~SR_TEE;
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env->pmr &= ~PMR_DME;
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env->pmr &= ~PMR_SME;
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env->lock_addr = -1;
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/* Set/clear dsx to indicate if we are in a delay slot exception. */
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if (env->dflag) {
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env->dflag = 0;
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env->sr |= SR_DSX;
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env->epcr -= 4;
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} else {
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env->sr &= ~SR_DSX;
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}
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if (exception > 0 && exception < EXCP_NR) {
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static const char * const int_name[EXCP_NR] = {
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[EXCP_RESET] = "RESET",
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[EXCP_BUSERR] = "BUSERR (bus error)",
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[EXCP_DPF] = "DFP (data protection fault)",
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[EXCP_IPF] = "IPF (code protection fault)",
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[EXCP_TICK] = "TICK (timer interrupt)",
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[EXCP_ALIGN] = "ALIGN",
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[EXCP_ILLEGAL] = "ILLEGAL",
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[EXCP_INT] = "INT (device interrupt)",
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[EXCP_DTLBMISS] = "DTLBMISS (data tlb miss)",
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[EXCP_ITLBMISS] = "ITLBMISS (code tlb miss)",
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[EXCP_RANGE] = "RANGE",
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[EXCP_SYSCALL] = "SYSCALL",
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[EXCP_FPE] = "FPE",
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[EXCP_TRAP] = "TRAP",
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};
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qemu_log_mask(CPU_LOG_INT, "INT: %s\n", int_name[exception]);
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hwaddr vect_pc = exception << 8;
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if (env->cpucfgr & CPUCFGR_EVBARP) {
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vect_pc |= env->evbar;
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}
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if (env->sr & SR_EPH) {
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vect_pc |= 0xf0000000;
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}
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env->pc = vect_pc;
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} else {
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cpu_abort(cs, "Unhandled exception 0x%x\n", exception);
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}
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#endif
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cs->exception_index = -1;
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}
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bool openrisc_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
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{
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OpenRISCCPU *cpu = OPENRISC_CPU(cs);
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CPUOpenRISCState *env = &cpu->env;
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int idx = -1;
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if ((interrupt_request & CPU_INTERRUPT_HARD) && (env->sr & SR_IEE)) {
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idx = EXCP_INT;
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}
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if ((interrupt_request & CPU_INTERRUPT_TIMER) && (env->sr & SR_TEE)) {
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idx = EXCP_TICK;
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}
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if (idx >= 0) {
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cs->exception_index = idx;
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openrisc_cpu_do_interrupt(cs);
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return true;
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}
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return false;
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}
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