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