Initial import of qemu-2.4.1HEADmaster

1 files changed, 85 insertions, 0 deletions

diff --git a/target-openrisc/interrupt.c b/target-openrisc/interrupt.c
new file mode 100644
index 00000000..e480cfd1
--- /dev/null
+++ b/target-openrisc/interrupt.c
@@ -0,0 +1,85 @@
+/*
+ * OpenRISC interrupt.
+ *
+ * Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cpu.h"
+#include "qemu-common.h"
+#include "exec/gdbstub.h"
+#include "qemu/host-utils.h"
+#ifndef CONFIG_USER_ONLY
+#include "hw/loader.h"
+#endif
+
+void openrisc_cpu_do_interrupt(CPUState *cs)
+{
+#ifndef CONFIG_USER_ONLY
+    OpenRISCCPU *cpu = OPENRISC_CPU(cs);
+    CPUOpenRISCState *env = &cpu->env;
+
+    env->epcr = env->pc;
+    if (env->flags & D_FLAG) {
+        env->flags &= ~D_FLAG;
+        env->sr |= SR_DSX;
+        env->epcr -= 4;
+    }
+    if (cs->exception_index == EXCP_SYSCALL) {
+        env->epcr += 4;
+    }
+
+    /* For machine-state changed between user-mode and supervisor mode,
+       we need flush TLB when we enter&exit EXCP.  */
+    tlb_flush(cs, 1);
+
+    env->esr = env->sr;
+    env->sr &= ~SR_DME;
+    env->sr &= ~SR_IME;
+    env->sr |= SR_SM;
+    env->sr &= ~SR_IEE;
+    env->sr &= ~SR_TEE;
+    env->tlb->cpu_openrisc_map_address_data = &cpu_openrisc_get_phys_nommu;
+    env->tlb->cpu_openrisc_map_address_code = &cpu_openrisc_get_phys_nommu;
+
+    if (cs->exception_index > 0 && cs->exception_index < EXCP_NR) {
+        env->pc = (cs->exception_index << 8);
+    } else {
+        cpu_abort(cs, "Unhandled exception 0x%x\n", cs->exception_index);
+    }
+#endif
+
+    cs->exception_index = -1;
+}
+
+bool openrisc_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
+{
+    OpenRISCCPU *cpu = OPENRISC_CPU(cs);
+    CPUOpenRISCState *env = &cpu->env;
+    int idx = -1;
+
+    if ((interrupt_request & CPU_INTERRUPT_HARD) && (env->sr & SR_IEE)) {
+        idx = EXCP_INT;
+    }
+    if ((interrupt_request & CPU_INTERRUPT_TIMER) && (env->sr & SR_TEE)) {
+        idx = EXCP_TICK;
+    }
+    if (idx >= 0) {
+        cs->exception_index = idx;
+        openrisc_cpu_do_interrupt(cs);
+        return true;
+    }
+    return false;
+}