1/*
2 * Alpha cpu parameters for qemu.
3 *
4 * Copyright (c) 2007 Jocelyn Mayer
5 * SPDX-License-Identifier: LGPL-2.0+
6 */
7
8#ifndef ALPHA_CPU_PARAM_H
9#define ALPHA_CPU_PARAM_H 1
10
11#define TARGET_LONG_BITS 64
12#define TARGET_PAGE_BITS 13
13#ifdef CONFIG_USER_ONLY
14/*
15 * ??? The kernel likes to give addresses in high memory. If the host has
16 * more virtual address space than the guest, this can lead to impossible
17 * allocations. Honor the long-standing assumption that only kernel addrs
18 * are negative, but otherwise allow allocations anywhere. This could lead
19 * to tricky emulation problems for programs doing tagged addressing, but
20 * that's far fewer than encounter the impossible allocation problem.
21 */
22#define TARGET_PHYS_ADDR_SPACE_BITS 63
23#define TARGET_VIRT_ADDR_SPACE_BITS 63
24#else
25/* ??? EV4 has 34 phys addr bits, EV5 has 40, EV6 has 44. */
26#define TARGET_PHYS_ADDR_SPACE_BITS 44
27#define TARGET_VIRT_ADDR_SPACE_BITS (30 + TARGET_PAGE_BITS)
28#endif
29#define NB_MMU_MODES 3
30
31#endif
32