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task_size_64.h
/* 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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