Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 171 insertions, 0 deletions

diff --git a/target/sparc/int32_helper.c b/target/sparc/int32_helper.c
new file mode 100644
index 000000000..82e8418e4
--- /dev/null
+++ b/target/sparc/int32_helper.c
@@ -0,0 +1,171 @@
+/*
+ * Sparc32 interrupt helpers
+ *
+ *  Copyright (c) 2003-2005 Fabrice Bellard
+ *
+ * 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 2.1 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 "qemu/osdep.h"
+#include "qemu/main-loop.h"
+#include "cpu.h"
+#include "trace.h"
+#include "exec/log.h"
+#include "sysemu/runstate.h"
+
+
+static const char * const excp_names[0x80] = {
+    [TT_TFAULT] = "Instruction Access Fault",
+    [TT_ILL_INSN] = "Illegal Instruction",
+    [TT_PRIV_INSN] = "Privileged Instruction",
+    [TT_NFPU_INSN] = "FPU Disabled",
+    [TT_WIN_OVF] = "Window Overflow",
+    [TT_WIN_UNF] = "Window Underflow",
+    [TT_UNALIGNED] = "Unaligned Memory Access",
+    [TT_FP_EXCP] = "FPU Exception",
+    [TT_DFAULT] = "Data Access Fault",
+    [TT_TOVF] = "Tag Overflow",
+    [TT_EXTINT | 0x1] = "External Interrupt 1",
+    [TT_EXTINT | 0x2] = "External Interrupt 2",
+    [TT_EXTINT | 0x3] = "External Interrupt 3",
+    [TT_EXTINT | 0x4] = "External Interrupt 4",
+    [TT_EXTINT | 0x5] = "External Interrupt 5",
+    [TT_EXTINT | 0x6] = "External Interrupt 6",
+    [TT_EXTINT | 0x7] = "External Interrupt 7",
+    [TT_EXTINT | 0x8] = "External Interrupt 8",
+    [TT_EXTINT | 0x9] = "External Interrupt 9",
+    [TT_EXTINT | 0xa] = "External Interrupt 10",
+    [TT_EXTINT | 0xb] = "External Interrupt 11",
+    [TT_EXTINT | 0xc] = "External Interrupt 12",
+    [TT_EXTINT | 0xd] = "External Interrupt 13",
+    [TT_EXTINT | 0xe] = "External Interrupt 14",
+    [TT_EXTINT | 0xf] = "External Interrupt 15",
+    [TT_CODE_ACCESS] = "Instruction Access Error",
+    [TT_DATA_ACCESS] = "Data Access Error",
+    [TT_DIV_ZERO] = "Division By Zero",
+    [TT_NCP_INSN] = "Coprocessor Disabled",
+};
+
+static const char *excp_name_str(int32_t exception_index)
+{
+    if (exception_index < 0 || exception_index >= ARRAY_SIZE(excp_names)) {
+        return "Unknown";
+    }
+    return excp_names[exception_index];
+}
+
+void cpu_check_irqs(CPUSPARCState *env)
+{
+    CPUState *cs;
+
+    /* We should be holding the BQL before we mess with IRQs */
+    g_assert(qemu_mutex_iothread_locked());
+
+    if (env->pil_in && (env->interrupt_index == 0 ||
+                        (env->interrupt_index & ~15) == TT_EXTINT)) {
+        unsigned int i;
+
+        for (i = 15; i > 0; i--) {
+            if (env->pil_in & (1 << i)) {
+                int old_interrupt = env->interrupt_index;
+
+                env->interrupt_index = TT_EXTINT | i;
+                if (old_interrupt != env->interrupt_index) {
+                    cs = env_cpu(env);
+                    trace_sun4m_cpu_interrupt(i);
+                    cpu_interrupt(cs, CPU_INTERRUPT_HARD);
+                }
+                break;
+            }
+        }
+    } else if (!env->pil_in && (env->interrupt_index & ~15) == TT_EXTINT) {
+        cs = env_cpu(env);
+        trace_sun4m_cpu_reset_interrupt(env->interrupt_index & 15);
+        env->interrupt_index = 0;
+        cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
+    }
+}
+
+void sparc_cpu_do_interrupt(CPUState *cs)
+{
+    SPARCCPU *cpu = SPARC_CPU(cs);
+    CPUSPARCState *env = &cpu->env;
+    int cwp, intno = cs->exception_index;
+
+    /* Compute PSR before exposing state.  */
+    if (env->cc_op != CC_OP_FLAGS) {
+        cpu_get_psr(env);
+    }
+
+    if (qemu_loglevel_mask(CPU_LOG_INT)) {
+        static int count;
+        const char *name;
+
+        if (intno < 0 || intno >= 0x100) {
+            name = "Unknown";
+        } else if (intno >= 0x80) {
+            name = "Trap Instruction";
+        } else {
+            name = excp_name_str(intno);
+        }
+
+        qemu_log("%6d: %s (v=%02x)\n", count, name, intno);
+        log_cpu_state(cs, 0);
+#if 0
+        {
+            int i;
+            uint8_t *ptr;
+
+            qemu_log("       code=");
+            ptr = (uint8_t *)env->pc;
+            for (i = 0; i < 16; i++) {
+                qemu_log(" %02x", ldub(ptr + i));
+            }
+            qemu_log("\n");
+        }
+#endif
+        count++;
+    }
+#if !defined(CONFIG_USER_ONLY)
+    if (env->psret == 0) {
+        if (cs->exception_index == 0x80 &&
+            env->def.features & CPU_FEATURE_TA0_SHUTDOWN) {
+            qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
+        } else {
+            cpu_abort(cs, "Trap 0x%02x (%s) while interrupts disabled, "
+                          "Error state",
+                      cs->exception_index, excp_name_str(cs->exception_index));
+        }
+        return;
+    }
+#endif
+    env->psret = 0;
+    cwp = cpu_cwp_dec(env, env->cwp - 1);
+    cpu_set_cwp(env, cwp);
+    env->regwptr[9] = env->pc;
+    env->regwptr[10] = env->npc;
+    env->psrps = env->psrs;
+    env->psrs = 1;
+    env->tbr = (env->tbr & TBR_BASE_MASK) | (intno << 4);
+    env->pc = env->tbr;
+    env->npc = env->pc + 4;
+    cs->exception_index = -1;
+
+#if !defined(CONFIG_USER_ONLY)
+    /* IRQ acknowledgment */
+    if ((intno & ~15) == TT_EXTINT && env->qemu_irq_ack != NULL) {
+        env->qemu_irq_ack(env, env->irq_manager, intno);
+    }
+#endif
+}