Cache Functions

Functions that configure Instruction and Data Cache. More...

Modules
	I-Cache Functions
	Functions that configure Instruction Cache.
	D-Cache Functions
	Functions that configure Data Cache.

Data Structures
struct	CacheInfo
	Cache Information Type. More...

Macros
#define	CCM_SUEN_SUEN_Msk   (0xFFFFFFFFFFFFFFFFUL)
	CSR CCM_SUEN: SUEN Mask. More...

Enumerations
enum	CCM_OP_FINFO {   CCM_OP_SUCCESS = 0x0,   CCM_OP_EXCEED_ERR = 0x1,   CCM_OP_PERM_CHECK_ERR = 0x2,   CCM_OP_REFILL_BUS_ERR = 0x3,   CCM_OP_ECC_ERR = 0x4 }
	Cache CCM Operation Fail Info. More...
enum	CCM_CMD {   CCM_DC_INVAL = 0x0,   CCM_DC_WB = 0x1,   CCM_DC_WBINVAL = 0x2,   CCM_DC_LOCK = 0x3,   CCM_DC_UNLOCK = 0x4,   CCM_DC_WBINVAL_ALL = 0x6,   CCM_DC_WB_ALL = 0x7,   CCM_DC_INVAL_ALL = 0x17,   CCM_IC_INVAL = 0x8,   CCM_IC_LOCK = 0xb,   CCM_IC_UNLOCK = 0xc,   CCM_IC_INVAL_ALL = 0xd }
	Cache CCM Command Types. More...

Functions
__STATIC_FORCEINLINE void	EnableSUCCM (void)
	Enable CCM operation in Supervisor/User Mode. More...
__STATIC_FORCEINLINE void	DisableSUCCM (void)
	Disable CCM operation in Supervisor/User Mode. More...
__STATIC_FORCEINLINE void	FlushPipeCCM (void)
	Flush pipeline after CCM operation. More...

Detailed Description

Functions that configure Instruction and Data Cache.

Nuclei provide Cache Control and Maintainence(CCM) for software to control and maintain the internal L1 I/D Cache of the RISC-V Core, software can manage the cache flexibly to meet the actual application scenarios.

The CCM operations have 3 types: by single address, by all and flush pipeline. The CCM operations are done via CSR registers, M/S/U mode has its own CSR registers to do CCM operations. By default, CCM operations are not allowed in S/U mode, you can execute EnableSUCCM in M-Mode to enable it.

• API names started with M<operations>, such as MInvalICacheLine must be called in M-Mode only.
• API names started with S<operations>, such as SInvalICacheLine should be called in S-Mode.
• API names started with U<operations>, such as UInvalICacheLine should be called in U-Mode.

Macro Definition Documentation

CCM_SUEN_SUEN_Msk

#define CCM_SUEN_SUEN_Msk   (0xFFFFFFFFFFFFFFFFUL)

CSR CCM_SUEN: SUEN Mask.

Definition at line 109 of file core_feature_cache.h.

Enumeration Type Documentation

CCM_CMD

enum CCM_CMD

Cache CCM Command Types.

Enumerator
CCM_DC_INVAL	Unlock and invalidate D-Cache line specified by CSR CCM_XBEGINADDR.
CCM_DC_WB	Flush the specific D-Cache line specified by CSR CCM_XBEGINADDR.
CCM_DC_WBINVAL	Unlock, flush and invalidate the specific D-Cache line specified by CSR CCM_XBEGINADDR.
CCM_DC_LOCK	Lock the specific D-Cache line specified by CSR CCM_XBEGINADDR.
CCM_DC_UNLOCK	Unlock the specific D-Cache line specified by CSR CCM_XBEGINADDR.
CCM_DC_WBINVAL_ALL	Unlock and flush and invalidate all the valid and dirty D-Cache lines.
CCM_DC_WB_ALL	Flush all the valid and dirty D-Cache lines.
CCM_DC_INVAL_ALL	Unlock and invalidate all the D-Cache lines.
CCM_IC_INVAL	Unlock and invalidate I-Cache line specified by CSR CCM_XBEGINADDR.
CCM_IC_LOCK	Lock the specific I-Cache line specified by CSR CCM_XBEGINADDR.
CCM_IC_UNLOCK	Unlock the specific I-Cache line specified by CSR CCM_XBEGINADDR.
CCM_IC_INVAL_ALL	Unlock and invalidate all the I-Cache lines.

Definition at line 81 of file core_feature_cache.h.

                     {
    CCM_DC_INVAL = 0x0,                 
    CCM_DC_WB = 0x1,                    
    CCM_DC_WBINVAL = 0x2,               
    CCM_DC_LOCK = 0x3,                  
    CCM_DC_UNLOCK = 0x4,                
    CCM_DC_WBINVAL_ALL = 0x6,           
    CCM_DC_WB_ALL = 0x7,                
    CCM_DC_INVAL_ALL = 0x17,            
    CCM_IC_INVAL = 0x8,                 
    CCM_IC_LOCK = 0xb,                  
    CCM_IC_UNLOCK = 0xc,                
    CCM_IC_INVAL_ALL = 0xd              
} CCM_CMD_Type;

CCM_OP_FINFO

enum CCM_OP_FINFO

Cache CCM Operation Fail Info.

Enumerator
CCM_OP_SUCCESS	Lock Succeed.
CCM_OP_EXCEED_ERR	Exceed the the number of lockable ways(N-Way I/D-Cache, lockable is N-1)
CCM_OP_PERM_CHECK_ERR	PMP/sPMP/Page-Table X(I-Cache)/R(D-Cache) permission check failed, or belong to Device/Non-Cacheable address range.
CCM_OP_REFILL_BUS_ERR	Refill has Bus Error.
CCM_OP_ECC_ERR	Deprecated, ECC Error, this error code is removed in later Nuclei CCM RTL design, please don't use it.

Definition at line 70 of file core_feature_cache.h.

                          {
    CCM_OP_SUCCESS = 0x0,               
    CCM_OP_EXCEED_ERR = 0x1,            
    CCM_OP_PERM_CHECK_ERR = 0x2,        
    CCM_OP_REFILL_BUS_ERR = 0x3,        
    CCM_OP_ECC_ERR = 0x4                
} CCM_OP_FINFO_Type;

Function Documentation

DisableSUCCM()

__STATIC_FORCEINLINE void DisableSUCCM

(

void

)

Disable CCM operation in Supervisor/User Mode.

This function disable CCM operation in Supervisor/User Mode. If not enabled, CCM operations in supervisor/user mode will trigger a illegal intruction exception.

Remarks

• This function can be called in M-Mode only.

See also

• EnableSUCCM

Definition at line 139 of file core_feature_cache.h.

{
    __RV_CSR_CLEAR(CSR_CCM_SUEN, CCM_SUEN_SUEN_Msk);
}

References __RV_CSR_CLEAR, CCM_SUEN_SUEN_Msk, and CSR_CCM_SUEN.

EnableSUCCM()

__STATIC_FORCEINLINE void EnableSUCCM

(

void

)

Enable CCM operation in Supervisor/User Mode.

This function enable CCM operation in Supervisor/User Mode. If enabled, CCM operations in supervisor/user mode will be allowed.

Remarks

• This function can be called in M-Mode only.

See also

• DisableSUCCM

Definition at line 123 of file core_feature_cache.h.

{
    __RV_CSR_SET(CSR_CCM_SUEN, CCM_SUEN_SUEN_Msk);
}

References __RV_CSR_SET, CCM_SUEN_SUEN_Msk, and CSR_CCM_SUEN.

FlushPipeCCM()

__STATIC_FORCEINLINE void FlushPipeCCM

(

void

)

Flush pipeline after CCM operation.

This function is used to flush pipeline after CCM operations on Cache, it will ensure latest instructions or data can be seen by pipeline.

Remarks

• This function can be called in M/S/U-Mode only.

Definition at line 153 of file core_feature_cache.h.

{
    __RV_CSR_WRITE(CSR_CCM_FPIPE, 0x1);
}

References __RV_CSR_WRITE, and CSR_CCM_FPIPE.