tcg: Split out target/arch/cpu-param.h

For all targets, into this new file move TARGET_LONG_BITS,
TARGET_PAGE_BITS, TARGET_PHYS_ADDR_SPACE_BITS,
TARGET_VIRT_ADDR_SPACE_BITS, and NB_MMU_MODES.

Include this new file from exec/cpu-defs.h.

This now removes the somewhat odd requirement that target/arch/cpu.h
defines TARGET_LONG_BITS before including exec/cpu-defs.h, so push the
bulk of the includes within target/arch/cpu.h to the top.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/ppc/cpu-param.h

@@ -0,0 +1,37 @@
+/*
+ * PowerPC cpu parameters for qemu.
+ *
+ * Copyright (c) 2007 Jocelyn Mayer
+ * SPDX-License-Identifier: LGPL-2.0+
+ */
+
+#ifndef PPC_CPU_PARAM_H
+#define PPC_CPU_PARAM_H 1
+
+#ifdef TARGET_PPC64
+# define TARGET_LONG_BITS 64
+/*
+ * Note that the official physical address space bits is 62-M where M
+ * is implementation dependent.  I've not looked up M for the set of
+ * cpus we emulate at the system level.
+ */
+#define TARGET_PHYS_ADDR_SPACE_BITS 62
+/*
+ * Note that the PPC environment architecture talks about 80 bit virtual
+ * addresses, with segmentation.  Obviously that's not all visible to a
+ * single process, which is all we're concerned with here.
+ */
+# ifdef TARGET_ABI32
+#  define TARGET_VIRT_ADDR_SPACE_BITS 32
+# else
+#  define TARGET_VIRT_ADDR_SPACE_BITS 64
+# endif
+#else
+# define TARGET_LONG_BITS 32
+# define TARGET_PHYS_ADDR_SPACE_BITS 36
+# define TARGET_VIRT_ADDR_SPACE_BITS 32
+#endif
+#define TARGET_PAGE_BITS 12
+#define NB_MMU_MODES 10
+
+#endif