1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_POWERPC_TASK_SIZE_64_H
3#define _ASM_POWERPC_TASK_SIZE_64_H
4
5/*
6 * 64-bit user address space can have multiple limits
7 * For now supported values are:
8 */
9#define TASK_SIZE_64TB  (0x0000400000000000UL)
10#define TASK_SIZE_128TB (0x0000800000000000UL)
11#define TASK_SIZE_512TB (0x0002000000000000UL)
12#define TASK_SIZE_1PB   (0x0004000000000000UL)
13#define TASK_SIZE_2PB   (0x0008000000000000UL)
14
15/*
16 * With 52 bits in the address we can support up to 4PB of range.
17 */
18#define TASK_SIZE_4PB   (0x0010000000000000UL)
19
20/*
21 * For now 512TB is only supported with book3s and 64K linux page size.
22 */
23#ifdef CONFIG_PPC_64K_PAGES
24/*
25 * Max value currently used:
26 */
27#define TASK_SIZE_USER64		TASK_SIZE_4PB
28#define DEFAULT_MAP_WINDOW_USER64	TASK_SIZE_128TB
29#define TASK_CONTEXT_SIZE		TASK_SIZE_512TB
30#else
31#define TASK_SIZE_USER64		TASK_SIZE_64TB
32#define DEFAULT_MAP_WINDOW_USER64	TASK_SIZE_64TB
33
34/*
35 * We don't need to allocate extended context ids for 4K page size, because we
36 * limit the max effective address on this config to 64TB.
37 */
38#define TASK_CONTEXT_SIZE TASK_SIZE_64TB
39#endif
40
41/*
42 * 32-bit user address space is 4GB - 1 page
43 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
44 */
45#define TASK_SIZE_USER32 (0x0000000100000000UL - (1 * PAGE_SIZE))
46
47#define TASK_SIZE (is_32bit_task() ? TASK_SIZE_USER32 : TASK_SIZE_USER64)
48
49#define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
50#define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(DEFAULT_MAP_WINDOW_USER64 / 4))
51
52/*
53 * This decides where the kernel will search for a free chunk of vm space during
54 * mmap's.
55 */
56#define TASK_UNMAPPED_BASE	\
57	((is_32bit_task()) ? TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64)
58
59/*
60 * Initial task size value for user applications. For book3s 64 we start
61 * with 128TB and conditionally enable upto 512TB
62 */
63#ifdef CONFIG_PPC_BOOK3S_64
64#define DEFAULT_MAP_WINDOW	\
65	((is_32bit_task()) ? TASK_SIZE_USER32 : DEFAULT_MAP_WINDOW_USER64)
66#else
67#define DEFAULT_MAP_WINDOW	TASK_SIZE
68#endif
69
70#define STACK_TOP_USER64 DEFAULT_MAP_WINDOW_USER64
71#define STACK_TOP_USER32 TASK_SIZE_USER32
72#define STACK_TOP_MAX TASK_SIZE_USER64
73#define STACK_TOP (is_32bit_task() ? STACK_TOP_USER32 : STACK_TOP_USER64)
74
75#define arch_get_mmap_base(addr, base) \
76	(((addr) > DEFAULT_MAP_WINDOW) ? (base) + TASK_SIZE - DEFAULT_MAP_WINDOW : (base))
77
78#define arch_get_mmap_end(addr, len, flags) \
79	(((addr) > DEFAULT_MAP_WINDOW) || \
80	 (((flags) & MAP_FIXED) && ((addr) + (len) > DEFAULT_MAP_WINDOW)) ? TASK_SIZE : \
81									    DEFAULT_MAP_WINDOW)
82
83#endif /* _ASM_POWERPC_TASK_SIZE_64_H */
84