nios2: Add architecture emulation support

Add support for emulating Altera NiosII R1 architecture into qemu.
This patch is based on previous work by Chris Wulff from 2012 and
updated to latest mainline QEMU.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chris Wulff <crwulff@gmail.com>
Cc: Jeff Da Silva <jdasilva@altera.com>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Sandra Loosemore <sandra@codesourcery.com>
Cc: Yves Vandervennet <yvanderv@altera.com>
Cc: Alexander Graf <agraf@suse.de>
Message-Id: <20170118220146.489-3-marex@denx.de>
[rth: Remove tlb_flush from nios2_cpu_reset.]
Signed-off-by: Richard Henderson <rth@twiddle.net>

1 files changed, 50 insertions, 0 deletions

diff --git a/target/nios2/mmu.h b/target/nios2/mmu.h
new file mode 100644
index 0000000..51d3d1f
--- /dev/null
+++ b/target/nios2/mmu.h
@@ -0,0 +1,50 @@
+/*
+ * Altera Nios II MMU emulation for qemu.
+ *
+ * Copyright (C) 2012 Chris Wulff <crwulff@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 2.1 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/lgpl-2.1.html>
+ */
+#ifndef MMU_NIOS2_H
+#define MMU_NIOS2_H
+
+typedef struct Nios2TLBEntry {
+    target_ulong tag;
+    target_ulong data;
+} Nios2TLBEntry;
+
+typedef struct Nios2MMU {
+    int tlb_entry_mask;
+    uint32_t pteaddr_wr;
+    uint32_t tlbacc_wr;
+    uint32_t tlbmisc_wr;
+    Nios2TLBEntry *tlb;
+} Nios2MMU;
+
+typedef struct Nios2MMULookup {
+    target_ulong vaddr;
+    target_ulong paddr;
+    int prot;
+} Nios2MMULookup;
+
+void mmu_flip_um(CPUNios2State *env, unsigned int um);
+unsigned int mmu_translate(CPUNios2State *env,
+                           Nios2MMULookup *lu,
+                           target_ulong vaddr, int rw, int mmu_idx);
+void mmu_read_debug(CPUNios2State *env, uint32_t rn);
+void mmu_write(CPUNios2State *env, uint32_t rn, uint32_t v);
+void mmu_init(CPUNios2State *env);
+
+#endif /* MMU_NIOS2_H */