/*
 * Copyright (c) 2020 Michael Schaffner
 * Copyright (c) 2020 BayLibre, SAS
 *
 * SPDX-License-Identifier: SHL-0.51
 * SPDX-License-Identifier: Apache-2.0
 */

#ifndef CSR_H_
#define CSR_H_

#define MSTATUS_UIE	0x00000001
#define MSTATUS_SIE	0x00000002
#define MSTATUS_HIE	0x00000004
#define MSTATUS_MIE	0x00000008
#define MSTATUS_UPIE	0x00000010
#define MSTATUS_SPIE	0x00000020
#define MSTATUS_HPIE	0x00000040
#define MSTATUS_MPIE	0x00000080
#define MSTATUS_SPP	0x00000100
#define MSTATUS_HPP	0x00000600
#define MSTATUS_MPP	0x00001800
#define MSTATUS_FS	0x00006000
#define MSTATUS_XS	0x00018000
#define MSTATUS_MPRV	0x00020000
#define MSTATUS_SUM	0x00040000
#define MSTATUS_MXR	0x00080000
#define MSTATUS_TVM	0x00100000
#define MSTATUS_TW	0x00200000
#define MSTATUS_TSR	0x00400000
#define MSTATUS32_SD	0x80000000
#define MSTATUS_UXL	0x0000000300000000
#define MSTATUS_SXL	0x0000000C00000000
#define MSTATUS64_SD	0x8000000000000000

#define SSTATUS_UIE	0x00000001
#define SSTATUS_SIE	0x00000002
#define SSTATUS_UPIE	0x00000010
#define SSTATUS_SPIE	0x00000020
#define SSTATUS_SPP	0x00000100
#define SSTATUS_FS	0x00006000
#define SSTATUS_XS	0x00018000
#define SSTATUS_SUM	0x00040000
#define SSTATUS_MXR	0x00080000
#define SSTATUS32_SD	0x80000000
#define SSTATUS_UXL	0x0000000300000000
#define SSTATUS64_SD	0x8000000000000000

#define DCSR_XDEBUGVER	(3U<<30)
#define DCSR_NDRESET	(1<<29)
#define DCSR_FULLRESET	(1<<28)
#define DCSR_EBREAKM	(1<<15)
#define DCSR_EBREAKH	(1<<14)
#define DCSR_EBREAKS	(1<<13)
#define DCSR_EBREAKU	(1<<12)
#define DCSR_STOPCYCLE	(1<<10)
#define DCSR_STOPTIME	(1<<9)
#define DCSR_CAUSE	(7<<6)
#define DCSR_DEBUGINT	(1<<5)
#define DCSR_HALT	(1<<3)
#define DCSR_STEP	(1<<2)
#define DCSR_PRV	(3<<0)

#define DCSR_CAUSE_NONE		0
#define DCSR_CAUSE_SWBP		1
#define DCSR_CAUSE_HWBP		2
#define DCSR_CAUSE_DEBUGINT	3
#define DCSR_CAUSE_STEP		4
#define DCSR_CAUSE_HALT		5

#define MCONTROL_TYPE(xlen)	(0xfULL<<((xlen)-4))
#define MCONTROL_DMODE(xlen)	(1ULL<<((xlen)-5))
#define MCONTROL_MASKMAX(xlen)	(0x3fULL<<((xlen)-11))

#define MCONTROL_SELECT		(1<<19)
#define MCONTROL_TIMING		(1<<18)
#define MCONTROL_ACTION		(0x3f<<12)
#define MCONTROL_CHAIN		(1<<11)
#define MCONTROL_MATCH		(0xf<<7)
#define MCONTROL_M		(1<<6)
#define MCONTROL_H		(1<<5)
#define MCONTROL_S		(1<<4)
#define MCONTROL_U		(1<<3)
#define MCONTROL_EXECUTE	(1<<2)
#define MCONTROL_STORE		(1<<1)
#define MCONTROL_LOAD		(1<<0)

#define MCONTROL_TYPE_NONE	0
#define MCONTROL_TYPE_MATCH	2

#define MCONTROL_ACTION_DEBUG_EXCEPTION	0
#define MCONTROL_ACTION_DEBUG_MODE	1
#define MCONTROL_ACTION_TRACE_START	2
#define MCONTROL_ACTION_TRACE_STOP	3
#define MCONTROL_ACTION_TRACE_EMIT	4

#define MCONTROL_MATCH_EQUAL		0
#define MCONTROL_MATCH_NAPOT		1
#define MCONTROL_MATCH_GE		2
#define MCONTROL_MATCH_LT		3
#define MCONTROL_MATCH_MASK_LOW		4
#define MCONTROL_MATCH_MASK_HIGH	5

#define MIP_SSIP	(1 << IRQ_S_SOFT)
#define MIP_HSIP	(1 << IRQ_H_SOFT)
#define MIP_MSIP	(1 << IRQ_M_SOFT)
#define MIP_STIP	(1 << IRQ_S_TIMER)
#define MIP_HTIP	(1 << IRQ_H_TIMER)
#define MIP_MTIP	(1 << IRQ_M_TIMER)
#define MIP_SEIP	(1 << IRQ_S_EXT)
#define MIP_HEIP	(1 << IRQ_H_EXT)
#define MIP_MEIP	(1 << IRQ_M_EXT)

#define SIP_SSIP	MIP_SSIP
#define SIP_STIP	MIP_STIP

#define PRV_U	0
#define PRV_S	1
#define PRV_H	2
#define PRV_M	3

#define SATP32_MODE	0x80000000
#define SATP32_ASID	0x7FC00000
#define SATP32_PPN	0x003FFFFF
#define SATP64_MODE	0xF000000000000000
#define SATP64_ASID	0x0FFFF00000000000
#define SATP64_PPN	0x00000FFFFFFFFFFF

#define SATP_MODE_OFF	0
#define SATP_MODE_SV32	1
#define SATP_MODE_SV39	8
#define SATP_MODE_SV48	9
#define SATP_MODE_SV57	10
#define SATP_MODE_SV64	11

#define PMP_R		0x01
#define PMP_W		0x02
#define PMP_X		0x04
#define PMP_A		0x18
#define PMP_L		0x80
#define PMP_SHIFT	2

#define PMP_TOR		0x08
#define PMP_NA4		0x10
#define PMP_NAPOT	0x18

#define IRQ_S_SOFT	1
#define IRQ_H_SOFT	2
#define IRQ_M_SOFT	3
#define IRQ_S_TIMER	5
#define IRQ_H_TIMER	6
#define IRQ_M_TIMER	7
#define IRQ_S_EXT	9
#define IRQ_H_EXT	10
#define IRQ_M_EXT	11
#define IRQ_COP		12
#define IRQ_HOST	13

#define DEFAULT_RSTVEC	0x00001000
#define CLINT_BASE	0x02000000
#define CLINT_SIZE	0x000c0000
#define EXT_IO_BASE	0x40000000
#define DRAM_BASE	0x80000000

/* page table entry (PTE) fields */
#define PTE_V		0x001 /* Valid */
#define PTE_R		0x002 /* Read */
#define PTE_W		0x004 /* Write */
#define PTE_X		0x008 /* Execute */
#define PTE_U		0x010 /* User */
#define PTE_G		0x020 /* Global */
#define PTE_A		0x040 /* Accessed */
#define PTE_D		0x080 /* Dirty */
#define PTE_SOFT	0x300 /* Reserved for Software */

#define PTE_PPN_SHIFT	10

#define PTE_TABLE(PTE) (((PTE) & (PTE_V | PTE_R | PTE_W | PTE_X)) == PTE_V)

#define INSERT_FIELD(val, which, fieldval)				\
(									\
	((val) & ~(which)) | ((fieldval) * ((which) & ~((which)-1)))	\
)									\

#define csr_read(csr)						\
({								\
	register unsigned long __v;				\
	__asm__ volatile ("csrr %0, " #csr			\
				: "=r" (__v));			\
	__v;							\
})

#define csr_write(csr, val)					\
({								\
	unsigned long __v = (unsigned long)(val);		\
	__asm__ volatile ("csrw " #csr ", %0"			\
				: : "rK" (__v)			\
				: "memory");			\
})


#define csr_read_set(csr, val)					\
({								\
	unsigned long __v = (unsigned long)(val);		\
	__asm__ volatile ("csrrs %0, " #csr ", %1"		\
				: "=r" (__v) : "rK" (__v)	\
				: "memory");			\
	__v;							\
})

#define csr_set(csr, val)					\
({								\
	unsigned long __v = (unsigned long)(val);		\
	__asm__ volatile ("csrs " #csr ", %0"			\
				: : "rK" (__v)			\
				: "memory");			\
})

#define csr_read_clear(csr, val)				\
({								\
	unsigned long __v = (unsigned long)(val);		\
	__asm__ volatile ("csrrc %0, " #csr ", %1"		\
				: "=r" (__v) : "rK" (__v)	\
				: "memory");			\
	__v;							\
})

#define csr_clear(csr, val)					\
({								\
	unsigned long __v = (unsigned long)(val);		\
	__asm__ volatile ("csrc " #csr ", %0"			\
				: : "rK" (__v)			\
				: "memory");			\
})

#endif /* CSR_H_ */
