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Linux/arch/powerpc/include/asm/task_size_64.h

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  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_OF(tsk)                                               \
 48         (test_tsk_thread_flag(tsk, TIF_32BIT) ? TASK_SIZE_USER32 :      \
 49                                                 TASK_SIZE_USER64)
 50 
 51 #define TASK_SIZE TASK_SIZE_OF(current)
 52 
 53 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
 54 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(DEFAULT_MAP_WINDOW_USER64 / 4))
 55 
 56 /*
 57  * This decides where the kernel will search for a free chunk of vm space during
 58  * mmap's.
 59  */
 60 #define TASK_UNMAPPED_BASE      \
 61         ((is_32bit_task()) ? TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64)
 62 
 63 /*
 64  * Initial task size value for user applications. For book3s 64 we start
 65  * with 128TB and conditionally enable upto 512TB
 66  */
 67 #ifdef CONFIG_PPC_BOOK3S_64
 68 #define DEFAULT_MAP_WINDOW      \
 69         ((is_32bit_task()) ? TASK_SIZE_USER32 : DEFAULT_MAP_WINDOW_USER64)
 70 #else
 71 #define DEFAULT_MAP_WINDOW      TASK_SIZE
 72 #endif
 73 
 74 #define STACK_TOP_USER64 DEFAULT_MAP_WINDOW_USER64
 75 #define STACK_TOP_USER32 TASK_SIZE_USER32
 76 #define STACK_TOP_MAX TASK_SIZE_USER64
 77 #define STACK_TOP (is_32bit_task() ? STACK_TOP_USER32 : STACK_TOP_USER64)
 78 
 79 #endif /* _ASM_POWERPC_TASK_SIZE_64_H */
 80 

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