Move target-* CPU file into a target/ folder

We've currently got 18 architectures in QEMU, and thus 18 target-xxx
folders in the root folder of the QEMU source tree. More architectures
(e.g. RISC-V, AVR) are likely to be included soon, too, so the main
folder of the QEMU sources slowly gets quite overcrowded with the
target-xxx folders.
To disburden the main folder a little bit, let's move the target-xxx
folders into a dedicated target/ folder, so that target-xxx/ simply
becomes target/xxx/ instead.

Acked-by: Laurent Vivier <laurent@vivier.eu> [m68k part]
Acked-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> [tricore part]
Acked-by: Michael Walle <michael@walle.cc> [lm32 part]
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> [s390x part]
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> [s390x part]
Acked-by: Eduardo Habkost <ehabkost@redhat.com> [i386 part]
Acked-by: Artyom Tarasenko <atar4qemu@gmail.com> [sparc part]
Acked-by: Richard Henderson <rth@twiddle.net> [alpha part]
Acked-by: Max Filippov <jcmvbkbc@gmail.com> [xtensa part]
Reviewed-by: David Gibson <david@gibson.dropbear.id.au> [ppc part]
Acked-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> [cris&microblaze part]
Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn> [unicore32 part]
Signed-off-by: Thomas Huth <thuth@redhat.com>

target/alpha/sys_helper.c

@@ -0,0 +1,91 @@
+/*
+ *  Helpers for system instructions.
+ *
+ *  Copyright (c) 2007 Jocelyn Mayer
+ *
+ * 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 "qemu/osdep.h"
+#include "cpu.h"
+#include "exec/exec-all.h"
+#include "exec/helper-proto.h"
+#include "sysemu/sysemu.h"
+#include "qemu/timer.h"
+
+
+uint64_t helper_load_pcc(CPUAlphaState *env)
+{
+#ifndef CONFIG_USER_ONLY
+    /* In system mode we have access to a decent high-resolution clock.
+       In order to make OS-level time accounting work with the RPCC,
+       present it with a well-timed clock fixed at 250MHz.  */
+    return (((uint64_t)env->pcc_ofs << 32)
+            | (uint32_t)(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) >> 2));
+#else
+    /* In user-mode, QEMU_CLOCK_VIRTUAL doesn't exist.  Just pass through the host cpu
+       clock ticks.  Also, don't bother taking PCC_OFS into account.  */
+    return (uint32_t)cpu_get_host_ticks();
+#endif
+}
+
+/* PALcode support special instructions */
+#ifndef CONFIG_USER_ONLY
+void helper_tbia(CPUAlphaState *env)
+{
+    tlb_flush(CPU(alpha_env_get_cpu(env)), 1);
+}
+
+void helper_tbis(CPUAlphaState *env, uint64_t p)
+{
+    tlb_flush_page(CPU(alpha_env_get_cpu(env)), p);
+}
+
+void helper_tb_flush(CPUAlphaState *env)
+{
+    tb_flush(CPU(alpha_env_get_cpu(env)));
+}
+
+void helper_halt(uint64_t restart)
+{
+    if (restart) {
+        qemu_system_reset_request();
+    } else {
+        qemu_system_shutdown_request();
+    }
+}
+
+uint64_t helper_get_vmtime(void)
+{
+    return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+}
+
+uint64_t helper_get_walltime(void)
+{
+    return qemu_clock_get_ns(rtc_clock);
+}
+
+void helper_set_alarm(CPUAlphaState *env, uint64_t expire)
+{
+    AlphaCPU *cpu = alpha_env_get_cpu(env);
+
+    if (expire) {
+        env->alarm_expire = expire;
+        timer_mod(cpu->alarm_timer, expire);
+    } else {
+        timer_del(cpu->alarm_timer);
+    }
+}
+
+#endif /* CONFIG_USER_ONLY */