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

INCLUDED FROM

   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 */