headers/private/kernel/kernel.h

   1 /*
   2  * Copyright 2002-2005, Axel Dörfler, axeld@pinc-software.de.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
   6  * Distributed under the terms of the NewOS License.
   7  */
   8 #ifndef _KERNEL_KERNEL_H
   9 #define _KERNEL_KERNEL_H
  10
  11
  12 #include <config/types.h>
  13
  14 #include <arch_kernel.h>
  15 #include <arch_config.h>
  16
  17
  18 #ifndef KERNEL_LOAD_BASE
  19 #       define KERNEL_LOAD_BASE         KERNEL_BASE
  20 #endif
  21
  22 // macro to check whether an address is in the kernel address space (avoid
  23 // always-true checks)
  24 #if KERNEL_BASE == 0
  25 #       define IS_KERNEL_ADDRESS(x)             ((addr_t)(x) <= KERNEL_TOP)
  26 #elif KERNEL_TOP == __HAIKU_ADDR_MAX
  27 #       define IS_KERNEL_ADDRESS(x)             ((addr_t)(x) >= KERNEL_BASE)
  28 #else
  29 #       define IS_KERNEL_ADDRESS(x) \
  30                 ((addr_t)(x) >= KERNEL_BASE && (addr_t)(x) <= KERNEL_TOP)
  31 #endif
  32
  33 // Buffers passed in from user-space shouldn't point into the kernel.
  34 #if USER_BASE == 0
  35 #       define IS_USER_ADDRESS(x)               ((addr_t)(x) <= USER_TOP)
  36 #elif USER_TOP == __HAIKU_ADDR_MAX
  37 #       define IS_USER_ADDRESS(x)               ((addr_t)(x) >= USER_BASE)
  38 #else
  39 #       define IS_USER_ADDRESS(x) \
  40                 ((addr_t)(x) >= USER_BASE && (addr_t)(x) <= USER_TOP)
  41 #endif
  42
  43 #define DEBUG_KERNEL_STACKS
  44         // Note, debugging kernel stacks doesn't really work yet. Since the
  45         // interrupt will also try to use the stack on a page fault, all
  46         // you get is a double fault.
  47         // At least, you then know that the stack overflows in this case :)
  48
  49 /** Size of the kernel stack */
  50 #ifdef B_HAIKU_64_BIT
  51         #define KERNEL_STACK_SIZE               (B_PAGE_SIZE * 4)       // 16 kB
  52 #else
  53         #define KERNEL_STACK_SIZE               (B_PAGE_SIZE * 3)       // 12 kB
  54 #endif
  55
  56 #ifdef DEBUG_KERNEL_STACKS
  57 #       define KERNEL_STACK_GUARD_PAGES 1
  58 #else
  59 #       define KERNEL_STACK_GUARD_PAGES 0
  60 #endif
  61
  62 /** Size of the environmental variables space for a process */
  63 #define ENV_SIZE        (B_PAGE_SIZE * 8)
  64
  65
  66 #define ROUNDDOWN(a, b) (((a) / (b)) * (b))
  67 #define ROUNDUP(a, b)   ROUNDDOWN((a) + (b) - 1, b)
  68
  69
  70 #define CHECK_BIT(a, b) ((a) & (1 << (b)))
  71 #define SET_BIT(a, b) ((a) | (1 << (b)))
  72 #define CLEAR_BIT(a, b) ((a) & (~(1 << (b))))
  73 #define GET_BIT(a, b) ((a & b) != 0)
  74 #define TOGGLE_BIT(a, b) (a ^= b)
  75
  76
  77 /* during kernel startup, interrupts are disabled (among other things) */
  78 extern bool gKernelStartup;
  79 extern bool gKernelShutdown;
  80
  81
  82 #ifdef __cplusplus
  83 extern "C" {
  84 #endif
  85
  86 status_t system_shutdown(bool reboot);
  87 status_t _user_shutdown(bool reboot);
  88
  89 #ifdef __cplusplus
  90 }
  91 #endif
  92
  93 #endif  /* _KERNEL_KERNEL_H */