SPMP Functions

Click TEE Introduction to learn about Core SPMP Unit in Nuclei ISA Spec.

__STATIC_INLINE rv_csr_t __get_sPMPCFGx (uint32_t csr_idx)
__STATIC_INLINE void __set_sPMPCFGx (uint32_t csr_idx, rv_csr_t spmpcfg)
__STATIC_INLINE uint8_t __get_sPMPxCFG (uint32_t entry_idx)
__STATIC_INLINE void __set_sPMPxCFG (uint32_t entry_idx, uint8_t spmpxcfg)
__STATIC_INLINE rv_csr_t __get_sPMPADDRx (uint32_t csr_idx)
__STATIC_INLINE void __set_sPMPADDRx (uint32_t csr_idx, rv_csr_t spmpaddr)
__STATIC_INLINE void __set_sPMPENTRYx (uint32_t entry_idx, const spmp_config *spmp_cfg)
__STATIC_INLINE int __get_sPMPENTRYx (unsigned int entry_idx, spmp_config *spmp_cfg)
struct SPMP_CONFIG
group NMSIS_Core_SPMP_Functions

Functions that related to the RISCV supervisor-mode Phyiscal Memory Protection.

Optional superviosr physical memory protection (sPMP) unit provides per-hart supervisor-mode control registers to allow physical memory access privileges (read, write, execute) to be specified for each physical memory region. The sPMP values are checked after the physical address to be accessed pass PMP checks described in the RISC-V privileged spec.

Like PMP, the sPMP can supports region access control settings as small as four bytes.

Functions

__STATIC_INLINE rv_csr_t __get_sPMPCFGx (uint32_t csr_idx)

Get sPMPCFGx Register by csr index.

Return the content of the sPMPCFGx Register.

Remark

  • For RV64, only csr_idx = 0 and csr_idx = 2 is allowed. spmpcfg0 and spmpcfg2 hold the configurations for the 16 sPMP entries, spmpcfg1 and spmpcfg3 are illegal

  • For RV32, spmpcfg0–spmpcfg3, hold the configurations spmp0cfg–spmp15cfg for the 16 sPMP entries

Parameters

csr_idx – [in] sPMPCFG CSR index(0-3)

Returns

sPMPCFGx Register value

__STATIC_INLINE void __set_sPMPCFGx (uint32_t csr_idx, rv_csr_t spmpcfg)

Set sPMPCFGx by csr index.

Write the given value to the sPMPCFGx Register.

Remark

  • For RV64, only csr_idx = 0 and csr_idx = 2 is allowed. spmpcfg0 and spmpcfg2 hold the configurations for the 16 sPMP entries, spmpcfg1 and spmpcfg3 are illegal

  • For RV32, spmpcfg0–spmpcfg3, hold the configurations spmp0cfg–spmp15cfg for the 16 sPMP entries

Parameters

  • csr_idx – [in] sPMPCFG CSR index(0-3)

  • spmpcfg – [in] sPMPCFGx Register value to set

__STATIC_INLINE uint8_t __get_sPMPxCFG (uint32_t entry_idx)

Get 8bit sPMPxCFG Register by sPMP entry index.

Return the content of the sPMPxCFG Register.

Parameters

entry_idx – [in] sPMP region index(0-15)

Returns

sPMPxCFG Register value

__STATIC_INLINE void __set_sPMPxCFG (uint32_t entry_idx, uint8_t spmpxcfg)

Set 8bit sPMPxCFG by spmp entry index.

Set the given spmpxcfg value to the sPMPxCFG Register.

Remark

  • For RV32, 4 spmpxcfgs are densely packed into one CSR in order For RV64, 8 spmpxcfgs are densely packed into one CSR in order

Parameters

  • entry_idx – [in] sPMPx region index(0-15)

  • spmpxcfg – [in] sPMPxCFG register value to set

__STATIC_INLINE rv_csr_t __get_sPMPADDRx (uint32_t csr_idx)

Get sPMPADDRx Register by CSR index.

Return the content of the sPMPADDRx Register.

Parameters

csr_idx – [in] sPMP region CSR index(0-15)

Returns

sPMPADDRx Register value

__STATIC_INLINE void __set_sPMPADDRx (uint32_t csr_idx, rv_csr_t spmpaddr)

Set sPMPADDRx by CSR index.

Write the given value to the sPMPADDRx Register.

Parameters

  • csr_idx – [in] sPMP region CSR index(0-15)

  • spmpaddr – [in] sPMPADDRx Register value to set

__STATIC_INLINE void __set_sPMPENTRYx (uint32_t entry_idx, const spmp_config *spmp_cfg)

Set sPMP entry by entry idx.

Write the given value to the sPMPxCFG Register and sPMPADDRx.

Remark

  • If the size of memory region is 2^12(4KB) range, spmp_cfg->order makes 12, and the like.

  • Suppose the size of memory region is 2^X bytes range, if X >=3, the NA4 mode is not selectable, NAPOT is selected.

  • TOR of A field in sPMP configuration register is not considered here.

Parameters

  • entry_idx – [in] sPMP entry index(0-15)

  • spmp_cfg – [in] structure of L,U,X,W,R field of sPMP configuration register, memory region base address and size of memory region as power of 2

__STATIC_INLINE int __get_sPMPENTRYx (unsigned int entry_idx, spmp_config *spmp_cfg)

Get sPMP entry by entry idx.

Write the given value to the sPMPxCFG Register and sPMPADDRx.

Remark

  • If the size of memory region is 2^12(4KB) range, spmp_cfg->order makes 12, and the like.

  • TOR of A field in PMP configuration register is not considered here.

Parameters

  • entry_idx – [in] sPMP entry index(0-15)

  • spmp_cfg – [out] structure of L, U, X, W, R, A field of sPMP configuration register, memory region base address and size of memory region as power of 2

Returns

-1 failure, else 0 success

struct SPMP_CONFIG
#include <core_feature_spmp.h>