/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1999 by Kaz Kojima
*
* Defitions for the address spaces of the SH CPUs.
*/
#ifndef __ASM_SH_ADDRSPACE_H
#define __ASM_SH_ADDRSPACE_H

#ifdef __KERNEL__

#include <cpu/addrspace.h>

/* If this CPU supports segmentation, hook up the helpers */
#ifdef P1SEG

/*
[ P0/U0 (virtual) ] 0x00000000 <------ User space
[ P1 (fixed) cached ] 0x80000000 <------ Kernel space
[ P2 (fixed) non-cachable] 0xA0000000 <------ Physical access
[ P3 (virtual) cached] 0xC0000000 <------ vmalloced area
[ P4 control ] 0xE0000000
*/

/* Returns the privileged segment base of a given address */
#define PXSEG(a) (((unsigned long)(a)) & 0xe0000000)

#ifdef CONFIG_29BIT
/*
* Map an address to a certain privileged segment
*/
#define P1SEGADDR(a) \
((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P1SEG))
#define P2SEGADDR(a) \
((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P2SEG))
#define P3SEGADDR(a) \
((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P3SEG))
#define P4SEGADDR(a) \
((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P4SEG))
#else
/*
* These will never work in 32-bit, don't even bother.
*/
#define P1SEGADDR(a) ({ (void)(a); BUG(); NULL; })
#define P2SEGADDR(a) ({ (void)(a); BUG(); NULL; })
#define P3SEGADDR(a) ({ (void)(a); BUG(); NULL; })
#define P4SEGADDR(a) ({ (void)(a); BUG(); NULL; })
#endif
#endif /* P1SEG */

/* Check if an address can be reached in 29 bits */
#define IS_29BIT(a) (((unsigned long)(a)) < 0x20000000)

#ifdef CONFIG_SH_STORE_QUEUES
/*
* This is a special case for the SH-4 store queues, as pages for this
* space still need to be faulted in before it's possible to flush the
* store queue cache for writeout to the remapped region.
*/
#define P3_ADDR_MAX (P4SEG_STORE_QUE + 0x04000000)
#else
#define P3_ADDR_MAX P4SEG
#endif

#endif /* __KERNEL__ */
#endif /* __ASM_SH_ADDRSPACE_H */