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 */ 70