exec/cpu-all: extract tlb flags defines to exec/tlb-flags.h

Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20250320223002.2915728-3-pierrick.bouvier@linaro.org>

1 files changed, 89 insertions, 0 deletions

diff --git a/include/exec/tlb-flags.h b/include/exec/tlb-flags.h
new file mode 100644
index 0000000000..a0e51a4b37
--- /dev/null
+++ b/include/exec/tlb-flags.h
@@ -0,0 +1,89 @@
+/*
+ * TLB flags definition
+ *
+ *  Copyright (c) 2003 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/>.
+ */
+#ifndef TLB_FLAGS_H
+#define TLB_FLAGS_H
+
+#include "exec/cpu-defs.h"
+
+#ifdef CONFIG_USER_ONLY
+
+/*
+ * Allow some level of source compatibility with softmmu.  We do not
+ * support any of the more exotic features, so only invalid pages may
+ * be signaled by probe_access_flags().
+ */
+#define TLB_INVALID_MASK    (1 << (TARGET_PAGE_BITS_MIN - 1))
+#define TLB_MMIO            (1 << (TARGET_PAGE_BITS_MIN - 2))
+#define TLB_WATCHPOINT      0
+
+#else
+
+/*
+ * Flags stored in the low bits of the TLB virtual address.
+ * These are defined so that fast path ram access is all zeros.
+ * The flags all must be between TARGET_PAGE_BITS and
+ * maximum address alignment bit.
+ *
+ * Use TARGET_PAGE_BITS_MIN so that these bits are constant
+ * when TARGET_PAGE_BITS_VARY is in effect.
+ *
+ * The count, if not the placement of these bits is known
+ * to tcg/tcg-op-ldst.c, check_max_alignment().
+ */
+/* Zero if TLB entry is valid.  */
+#define TLB_INVALID_MASK    (1 << (TARGET_PAGE_BITS_MIN - 1))
+/*
+ * Set if TLB entry references a clean RAM page.  The iotlb entry will
+ * contain the page physical address.
+ */
+#define TLB_NOTDIRTY        (1 << (TARGET_PAGE_BITS_MIN - 2))
+/* Set if TLB entry is an IO callback.  */
+#define TLB_MMIO            (1 << (TARGET_PAGE_BITS_MIN - 3))
+/* Set if TLB entry writes ignored.  */
+#define TLB_DISCARD_WRITE   (1 << (TARGET_PAGE_BITS_MIN - 4))
+/* Set if the slow path must be used; more flags in CPUTLBEntryFull. */
+#define TLB_FORCE_SLOW      (1 << (TARGET_PAGE_BITS_MIN - 5))
+
+/*
+ * Use this mask to check interception with an alignment mask
+ * in a TCG backend.
+ */
+#define TLB_FLAGS_MASK \
+    (TLB_INVALID_MASK | TLB_NOTDIRTY | TLB_MMIO \
+    | TLB_FORCE_SLOW | TLB_DISCARD_WRITE)
+
+/*
+ * Flags stored in CPUTLBEntryFull.slow_flags[x].
+ * TLB_FORCE_SLOW must be set in CPUTLBEntry.addr_idx[x].
+ */
+/* Set if TLB entry requires byte swap.  */
+#define TLB_BSWAP            (1 << 0)
+/* Set if TLB entry contains a watchpoint.  */
+#define TLB_WATCHPOINT       (1 << 1)
+/* Set if TLB entry requires aligned accesses.  */
+#define TLB_CHECK_ALIGNED    (1 << 2)
+
+#define TLB_SLOW_FLAGS_MASK  (TLB_BSWAP | TLB_WATCHPOINT | TLB_CHECK_ALIGNED)
+
+/* The two sets of flags must not overlap. */
+QEMU_BUILD_BUG_ON(TLB_FLAGS_MASK & TLB_SLOW_FLAGS_MASK);
+
+#endif /* !CONFIG_USER_ONLY */
+
+#endif /* TLB_FLAGS_H */