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
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