Hexagon HVX (target/hexagon) instruction utility functions

Functions to support scatter/gather
Add new file to target/hexagon/meson.build

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>

3 files changed, 73 insertions, 0 deletions

diff --git a/target/hexagon/meson.build b/target/hexagon/meson.build
index c6d858ffb2..0bfaa41ec3 100644
--- a/target/hexagon/meson.build
+++ b/target/hexagon/meson.build
@@ -174,6 +174,7 @@ hexagon_ss.add(files(
     'printinsn.c',
     'arch.c',
     'fma_emu.c',
+    'mmvec/system_ext_mmvec.c',
 ))
 
 target_arch += {'hexagon': hexagon_ss}
diff --git a/target/hexagon/mmvec/system_ext_mmvec.c b/target/hexagon/mmvec/system_ext_mmvec.c
new file mode 100644
index 0000000000..8351f2cc01
--- /dev/null
+++ b/target/hexagon/mmvec/system_ext_mmvec.c
@@ -0,0 +1,47 @@
+/*
+ *  Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "mmvec/system_ext_mmvec.h"
+
+void mem_gather_store(CPUHexagonState *env, target_ulong vaddr, int slot)
+{
+    size_t size = sizeof(MMVector);
+
+    env->vstore_pending[slot] = 1;
+    env->vstore[slot].va   = vaddr;
+    env->vstore[slot].size = size;
+    memcpy(&env->vstore[slot].data.ub[0], &env->tmp_VRegs[0], size);
+
+    /* On a gather store, overwrite the store mask to emulate dropped gathers */
+    bitmap_copy(env->vstore[slot].mask, env->vtcm_log.mask, size);
+}
+
+void mem_vector_scatter_init(CPUHexagonState *env)
+{
+    bitmap_zero(env->vtcm_log.mask, MAX_VEC_SIZE_BYTES);
+
+    env->vtcm_pending = true;
+    env->vtcm_log.op = false;
+    env->vtcm_log.op_size = 0;
+}
+
+void mem_vector_gather_init(CPUHexagonState *env)
+{
+    bitmap_zero(env->vtcm_log.mask, MAX_VEC_SIZE_BYTES);
+}
diff --git a/target/hexagon/mmvec/system_ext_mmvec.h b/target/hexagon/mmvec/system_ext_mmvec.h
new file mode 100644
index 0000000000..bcefbffdf2
--- /dev/null
+++ b/target/hexagon/mmvec/system_ext_mmvec.h
@@ -0,0 +1,25 @@
+/*
+ *  Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef HEXAGON_SYSTEM_EXT_MMVEC_H
+#define HEXAGON_SYSTEM_EXT_MMVEC_H
+
+void mem_gather_store(CPUHexagonState *env, target_ulong vaddr, int slot);
+void mem_vector_scatter_init(CPUHexagonState *env);
+void mem_vector_gather_init(CPUHexagonState *env);
+
+#endif