rt-thread/libcpu/mips/common/mips_addrspace.h

/*
 * Copyright (c) 2006-2019, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2019-12-04     Jiaxun Yang  Initial version
 */

#ifndef _MIPS_ADDRSPACE_H_
#define _MIPS_ADDRSPACE_H_


/*
 *  Configure language
 */
#ifdef __ASSEMBLY__
#define _ATYPE_
#define _ATYPE32_
#define _ATYPE64_
#define _CONST64_(x)	x
#else
#define _ATYPE_		__PTRDIFF_TYPE__
#define _ATYPE32_	int
#define _ATYPE64_	__s64
#ifdef CONFIG_64BIT
#define _CONST64_(x)	x ## L
#else
#define _CONST64_(x)	x ## LL
#endif
#endif

/*
 *  32-bit MIPS address spaces
 */
#ifdef __ASSEMBLY__
#define _ACAST32_
#define _ACAST64_
#else
#define _ACAST32_		(_ATYPE_)(_ATYPE32_)	/* widen if necessary */
#define _ACAST64_		(_ATYPE64_)		/* do _not_ narrow */
#endif

/*
 * Returns the kernel segment base of a given address
 */
#define KSEGX(a)		((_ACAST32_ (a)) & 0xe0000000)

/*
 * Returns the physical address of a CKSEGx / XKPHYS address
 */
#define CPHYSADDR(a)		((_ACAST32_(a)) & 0x1fffffff)
#define XPHYSADDR(a)		((_ACAST64_(a)) &			\
				 _CONST64_(0x000000ffffffffff))

#ifdef CONFIG_64BIT

/*
 * Memory segments (64bit kernel mode addresses)
 * The compatibility segments use the full 64-bit sign extended value.  Note
 * the R8000 doesn't have them so don't reference these in generic MIPS code.
 */
#define XKUSEG			_CONST64_(0x0000000000000000)
#define XKSSEG			_CONST64_(0x4000000000000000)
#define XKPHYS			_CONST64_(0x8000000000000000)
#define XKSEG			_CONST64_(0xc000000000000000)
#define CKSEG0			_CONST64_(0xffffffff80000000)
#define CKSEG1			_CONST64_(0xffffffffa0000000)
#define CKSSEG			_CONST64_(0xffffffffc0000000)
#define CKSEG3			_CONST64_(0xffffffffe0000000)

#define CKSEG0ADDR(a)		(CPHYSADDR(a) | CKSEG0)
#define CKSEG1ADDR(a)		(CPHYSADDR(a) | CKSEG1)
#define CKSEG2ADDR(a)		(CPHYSADDR(a) | CKSEG2)
#define CKSEG3ADDR(a)		(CPHYSADDR(a) | CKSEG3)

#else

#define CKSEG0ADDR(a)		(CPHYSADDR(a) | KSEG0BASE)
#define CKSEG1ADDR(a)		(CPHYSADDR(a) | KSEG1BASE)
#define CKSEG2ADDR(a)		(CPHYSADDR(a) | KSEG2BASE)
#define CKSEG3ADDR(a)		(CPHYSADDR(a) | KSEG3BASE)

/*
 * Map an address to a certain kernel segment
 */
#define KSEG0ADDR(a)		(CPHYSADDR(a) | KSEG0BASE)
#define KSEG1ADDR(a)		(CPHYSADDR(a) | KSEG1BASE)
#define KSEG2ADDR(a)		(CPHYSADDR(a) | KSEG2BASE)
#define KSEG3ADDR(a)		(CPHYSADDR(a) | KSEG3BASE)

/*
 * Memory segments (32bit kernel mode addresses)
 * These are the traditional names used in the 32-bit universe.
 */
#define KUSEGBASE			0x00000000
#define KSEG0BASE			0x80000000
#define KSEG1BASE			0xa0000000
#define KSEG2BASE			0xc0000000
#define KSEG3BASE			0xe0000000

#define CKUSEG			0x00000000
#define CKSEG0			0x80000000
#define CKSEG1			0xa0000000
#define CKSEG2			0xc0000000
#define CKSEG3			0xe0000000

#endif

/*
 * Cache modes for XKPHYS address conversion macros
 */
#define K_CALG_COH_EXCL1_NOL2	0
#define K_CALG_COH_SHRL1_NOL2	1
#define K_CALG_UNCACHED		2
#define K_CALG_NONCOHERENT	3
#define K_CALG_COH_EXCL		4
#define K_CALG_COH_SHAREABLE	5
#define K_CALG_NOTUSED		6
#define K_CALG_UNCACHED_ACCEL	7

/*
 * 64-bit address conversions
 */
#define PHYS_TO_XKSEG_UNCACHED(p)	PHYS_TO_XKPHYS(K_CALG_UNCACHED, (p))
#define PHYS_TO_XKSEG_CACHED(p)		PHYS_TO_XKPHYS(K_CALG_COH_SHAREABLE, (p))
#define XKPHYS_TO_PHYS(p)		((p) & TO_PHYS_MASK)
#define PHYS_TO_XKPHYS(cm, a)		(_CONST64_(0x8000000000000000) | \
					 (_CONST64_(cm) << 59) | (a))

/*
 * Returns the uncached address of a sdram address
 */
#ifndef __ASSEMBLY__

/*
 * The ultimate limited of the 64-bit MIPS architecture:  2 bits for selecting
 * the region, 3 bits for the CCA mode.  This leaves 59 bits of which the
 * R8000 implements most with its 48-bit physical address space.
 */
#define TO_PHYS_MASK	_CONST64_(0x07ffffffffffffff)	/* 2^^59 - 1 */
#define COMPAT_K1BASE32		_CONST64_(0xffffffffa0000000)
#define PHYS_TO_COMPATK1(x)	((x) | COMPAT_K1BASE32) /* 32-bit compat k1 */

#define KDM_TO_PHYS(x)		(_ACAST64_ (x) & TO_PHYS_MASK)
#define PHYS_TO_K0(x)		(_ACAST64_ (x) | CAC_BASE)
#endif


#ifndef __ASSEMBLY__
#define REG8( addr )		  (*(volatile u8 *) (addr))
#define REG16( addr )		  (*(volatile u16 *)(addr))
#define REG32( addr )		  (*(volatile u32 *)(addr))
#define REG64( addr )		  (*(volatile u64 *)(addr))
#endif

#endif /* _MIPS_ADDRSPACE_H_ */