arch/sh/include/asm/addrspace.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1999 by Kaz Kojima
   7  *
   8  * Defitions for the address spaces of the SH CPUs.
   9  */
  10 #ifndef __ASM_SH_ADDRSPACE_H
  11 #define __ASM_SH_ADDRSPACE_H
  12
  13 #ifdef __KERNEL__
  14
  15 #include <cpu/addrspace.h>
  16
  17 /* If this CPU supports segmentation, hook up the helpers */
  18 #ifdef P1SEG
  19
  20 /*
  21    [ P0/U0 (virtual) ]          0x00000000     <------ User space
  22    [ P1 (fixed)   cached ]      0x80000000     <------ Kernel space
  23    [ P2 (fixed)  non-cachable]  0xA0000000     <------ Physical access
  24    [ P3 (virtual) cached]       0xC0000000     <------ vmalloced area
  25    [ P4 control   ]             0xE0000000
  26  */
  27
  28 /* Returns the privileged segment base of a given address  */
  29 #define PXSEG(a)        (((unsigned long)(a)) & 0xe0000000)
  30
  31 #ifdef CONFIG_29BIT
  32 /*
  33  * Map an address to a certain privileged segment
  34  */
  35 #define P1SEGADDR(a)    \
  36         ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P1SEG))
  37 #define P2SEGADDR(a)    \
  38         ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P2SEG))
  39 #define P3SEGADDR(a)    \
  40         ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P3SEG))
  41 #define P4SEGADDR(a)    \
  42         ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P4SEG))
  43 #else
  44 /*
  45  * These will never work in 32-bit, don't even bother.
  46  */
  47 #define P1SEGADDR(a)    __futile_remapping_attempt
  48 #define P2SEGADDR(a)    __futile_remapping_attempt
  49 #define P3SEGADDR(a)    __futile_remapping_attempt
  50 #define P4SEGADDR(a)    __futile_remapping_attempt
  51 #endif
  52 #endif /* P1SEG */
  53
  54 /* Check if an address can be reached in 29 bits */
  55 #define IS_29BIT(a)     (((unsigned long)(a)) < 0x20000000)
  56
  57 #ifdef CONFIG_SH_STORE_QUEUES
  58 /*
  59  * This is a special case for the SH-4 store queues, as pages for this
  60  * space still need to be faulted in before it's possible to flush the
  61  * store queue cache for writeout to the remapped region.
  62  */
  63 #define P3_ADDR_MAX             (P4SEG_STORE_QUE + 0x04000000)
  64 #else
  65 #define P3_ADDR_MAX             P4SEG
  66 #endif
  67
  68 #endif /* __KERNEL__ */
  69 #endif /* __ASM_SH_ADDRSPACE_H */