LXR linux/arch/powerpc/include/asm/task_size

   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