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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_TASK_SIZE_64_H
#define _ASM_POWERPC_TASK_SIZE_64_H
/*
* 64-bit user address space can have multiple limits
* For now supported values are:
*/
#define TASK_SIZE_64TB (0x0000400000000000UL)
#define TASK_SIZE_128TB (0x0000800000000000UL)
#define TASK_SIZE_512TB (0x0002000000000000UL)
#define TASK_SIZE_1PB (0x0004000000000000UL)
#define TASK_SIZE_2PB (0x0008000000000000UL)
/*
* With 52 bits in the address we can support up to 4PB of range.
*/
#define TASK_SIZE_4PB (0x0010000000000000UL)
/*
* For now 512TB is only supported with book3s and 64K linux page size.
*/
#ifdef CONFIG_PPC_64K_PAGES
/*
* Max value currently used:
*/
#define TASK_SIZE_USER64 TASK_SIZE_4PB
#define DEFAULT_MAP_WINDOW_USER64 TASK_SIZE_128TB
#define TASK_CONTEXT_SIZE TASK_SIZE_512TB
#else
#define TASK_SIZE_USER64 TASK_SIZE_64TB
#define DEFAULT_MAP_WINDOW_USER64 TASK_SIZE_64TB
/*
* We don't need to allocate extended context ids for 4K page size, because we
* limit the max effective address on this config to 64TB.
*/
#define TASK_CONTEXT_SIZE TASK_SIZE_64TB
#endif
/*
* 32-bit user address space is 4GB - 1 page
* (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
*/
#define TASK_SIZE_USER32 (0x0000000100000000UL - (1 * PAGE_SIZE))
#define TASK_SIZE (is_32bit_task() ? TASK_SIZE_USER32 : TASK_SIZE_USER64)
#define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
#define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(DEFAULT_MAP_WINDOW_USER64 / 4))
/*
* This decides where the kernel will search for a free chunk of vm space during
* mmap's.
*/
#define TASK_UNMAPPED_BASE \
((is_32bit_task()) ? TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64)
/*
* Initial task size value for user applications. For book3s 64 we start
* with 128TB and conditionally enable upto 512TB
*/
#ifdef CONFIG_PPC_BOOK3S_64
#define DEFAULT_MAP_WINDOW \
((is_32bit_task()) ? TASK_SIZE_USER32 : DEFAULT_MAP_WINDOW_USER64)
#else
#define DEFAULT_MAP_WINDOW TASK_SIZE
#endif
#define STACK_TOP_USER64 DEFAULT_MAP_WINDOW_USER64
#define STACK_TOP_USER32 TASK_SIZE_USER32
#define STACK_TOP_MAX TASK_SIZE_USER64
#define STACK_TOP (is_32bit_task() ? STACK_TOP_USER32 : STACK_TOP_USER64)
#define arch_get_mmap_base(addr, base) \
(((addr) > DEFAULT_MAP_WINDOW) ? (base) + TASK_SIZE - DEFAULT_MAP_WINDOW : (base))
#define arch_get_mmap_end(addr, len, flags) \
(((addr) > DEFAULT_MAP_WINDOW) || \
(((flags) & MAP_FIXED) && ((addr) + (len) > DEFAULT_MAP_WINDOW)) ? TASK_SIZE : \
DEFAULT_MAP_WINDOW)
#endif /* _ASM_POWERPC_TASK_SIZE_64_H */
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