/************************************************************************************
* arch/arm/src/armv7-a/sctlr.h
* CP15 System Control Registers
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* References:
*
* "Cortex-A5� MPCore, Technical Reference Manual", Revision: r0p1, Copyright � 2010
* ARM. All rights reserved. ARM DDI 0434B (ID101810)
* "ARM� Architecture Reference Manual, ARMv7-A and ARMv7-R edition", Copyright �
* 1996-1998, 2000, 2004-2012 ARM. All rights reserved. ARM DDI 0406C.b (ID072512)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************************************/
#ifndef __ARCH_ARM_SRC_ARMV7_A_SCTLR_H
#define __ARCH_ARM_SRC_ARMV7_A_SCTLR_H
/************************************************************************************
* Included Files
************************************************************************************/
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
/* Reference: Cortex-A5� MPCore Paragraph 4.2, "Register summary." */
/* Main ID Register (MIDR) */
/* TODO: To be provided */
/* Cache Type Register (CTR) */
/* TODO: To be provided */
/* TCM Type Register
*
* The Cortex-A5 MPCore processor does not implement instruction or data Tightly
* Coupled Memory (TCM), so this register always Reads-As-Zero (RAZ).
*
* TLB Type Register
*
* The Cortex-A5 MPCore processor does not implement instruction or data Tightly
* CoupledMemory (TCM), so this register always Reads-As-Zero (RAZ).
*/
/* Multiprocessor Affinity Register (MPIDR) */
/* TODO: To be provided */
/* Processor Feature Register 0 (ID_PFR0) */
/* TODO: To be provided */
/* Processor Feature Register 1 (ID_PFR1) */
/* TODO: To be provided */
/* Debug Feature Register 0 (ID_DFR0) */
/* TODO: To be provided */
/* Auxiliary Feature Register 0 (ID_AFR0) */
/* TODO: To be provided */
/* Memory Model Features Register 0 (ID_MMFR0) */
/* Memory Model Features Register 1 (ID_MMFR1) */
/* Memory Model Features Register 2 (ID_MMFR2) */
/* Memory Model Features Register 3 (ID_MMFR3) */
/* TODO: To be provided */
/* Instruction Set Attributes Register 0 (ID_ISAR0) */
/* Instruction Set Attributes Register 1 (ID_ISAR1) */
/* Instruction Set Attributes Register 2 (ID_ISAR2) */
/* Instruction Set Attributes Register 3 (ID_ISAR3) */
/* Instruction Set Attributes Register 4 (ID_ISAR4) */
/* Instruction Set Attributes Register 5 (ID_ISAR5) */
/* Instruction Set Attributes Register 6-7 (ID_ISAR6-7). Reserved. */
/* TODO: Others to be provided */
/* Cache Size Identification Register (CCSIDR) */
/* TODO: To be provided */
/* Cache Level ID Register (CLIDR) */
/* TODO: To be provided */
/* Auxiliary ID Register (AIDR) */
/* TODO: To be provided */
/* Cache Size Selection Register (CSSELR) */
/* TODO: To be provided */
/* System Control Register (SCTLR)
*
* NOTES:
* (1) Always enabled on A5
* (2) Not available on A5
*/
#define SCTLR_M (1 << 0) /* Bit 0: Enables the MMU */
#define SCTLR_A (1 << 1) /* Bit 1: Enables strict alignment of data */
#define SCTLR_C (1 << 2) /* Bit 2: Determines if data can be cached */
/* Bits 3-9: Reserved */
#define SCTLR_SW (1 << 10) /* Bit 10: SWP/SWPB Enable bit */
#define SCTLR_Z (1 << 11) /* Bit 11: Program flow prediction control (1) */
#define SCTLR_I (1 << 12) /* Bit 12: Determines if instructions can be cached */
#define SCTLR_V (1 << 13) /* Bit 13: Vectors bit */
#define SCTLR_RR (1 << 14) /* Bit 14: Cache replacement strategy (2) */
/* Bits 15-16: Reserved */
#define SCTLR_HA (1 << 17) /* Bit 17: Hardware management access disabled (2) */
/* Bits 18-24: Reserved */
#define SCTLR_EE (1 << 25) /* Bit 25: Determines the value the CPSR.E */
/* Bits 26-27: Reserved */
#define SCTLR_TRE (1 << 28) /* Bit 28: TEX remap */
#define SCTLR_AFE (1 << 29) /* Bit 29: Access Flag Enable bit */
#define SCTLR_TE (1 << 30) /* Bit 30: Thumb exception enable */
/* Bit 31: Reserved */
/* Auxiliary Control Register (ACTLR) */
/* TODO: To be provided */
/* Coprocessor Access Control Register (CPACR) */
/* TODO: To be provided */
/* Secure Configuration Register (SCR) */
/* TODO: To be provided */
/* Secure Debug Enable Register (SDER) */
/* TODO: To be provided */
/* Non-secure Access Control Register (NSACR) */
/* Bits 0-9: Reserved */
#define NSACR_CP10 (1 << 10) /* Bit 10: Permission to access coprocessor 10 */
#define NSACR_CP11 (1 << 11) /* Bit 11: Permission to access coprocessor 11 */
/* Bits 12-13: Reserved */
#define NSACR_NSD32DIS (1 << 14) /* Bit 14: Disable the Non-secure use of VFP D16-D31 */
#define NSACR_NSASEDIS (1 << 15) /* Bit 15: Disable Non-secure Advanced SIMD Extension */
/* Bits 16-17: Reserved */
#define NSACR_NSSMP (1 << 18) /* Bit 18: ACR SMP bit writable */
/* Bits 19-31: Reserved */
/* Virtualization Control Register (VCR) */
/* TODO: To be provided */
/* Translation Table Base Register 0 (TTBR0). See mmu.h */
/* Translation Table Base Register 1 (TTBR1). See mmu.h */
/* Translation Table Base Control Register (TTBCR). See mmu.h */
/* Domain Access Control Register (DACR). See mmu.h */
/* Data Fault Status Register (DFSR). See mmu.h */
/* Instruction Fault Status Register (IFSR). See mmu.h */
/* Auxiliary Data Fault Status Register (ADFSR). Not used in this implementation. */
/* Data Fault Address Register(DFAR)
*
* Holds the MVA of the faulting address when a synchronous fault occurs
*
* Instruction Fault Address Register(IFAR)
*
* Holds the MVA of the faulting address of the instruction that caused a prefetch
* abort.
*
* NOP Register
*
* The use of this register is optional and deprecated. Use the NOP instruction
* instead.
*
* Physical Address Register (PAR)
*
* Holds:
* - the PA after a successful translation
* - the source of the abort for an unsuccessful translation
*
* Instruction Synchronization Barrier
*
* The use of ISB is optional and deprecated. Use the instruction ISB instead.
*
* Data Memory Barrier
* The use of DMB is deprecated and, on Cortex-A5 MPCore, behaves as NOP. Use the
* instruction DMB instead.
*/
/* Vector Base Address Register (VBAR) */
#define VBAR_MASK (0xffffffe0)
/* Monitor Vector Base Address Register (MVBAR) */
/* TODO: To be provided */
/* Interrupt Status Register (ISR) */
/* TODO: To be provided */
/* Virtualization Interrupt Register (VIR) */
/* TODO: To be provided */
/* Context ID Register (CONTEXTIDR) */
#define CONTEXTIDR_ASID_SHIFT (0) /* Bits 0-7: Address Space Identifier */
#define CONTEXTIDR_ASID_MASK (0xff << CONTEXTIDR_ASID_SHIFT)
#define CONTEXTIDR_PROCID_SHIFT (8) /* Bits 8-31: Process Identifier */
#define CONTEXTIDR_PROCID_MASK (0x00ffffff << CONTEXTIDR_PROCID_SHIFT)
/* Configuration Base Address Register (CBAR) */
/* TODO: To be provided */
/************************************************************************************
* Assemby Macros
************************************************************************************/
#ifdef __ASSEMBLY__
/* Get the device ID */
.macro cp15_rdid, id
mrc p15, 0, \id, c0, c0, 0
.endm
/* Read/write the system control register (SCTLR) */
.macro cp15_rdsctlr, sctlr
mrc p15, 0, \sctlr, c1, c0, 0
.endm
.macro cp15_wrsctlr, sctlr
mcr p15, 0, \sctlr, c1, c0, 0
nop
nop
nop
nop
nop
nop
nop
nop
.endm
#endif /* __ASSEMBLY__ */
/************************************************************************************
* Inline Functions
************************************************************************************/
#ifndef __ASSEMBLY__
/* Get the device ID */
static inline unsigned int cp15_rdid(void)
{
unsigned int id;
__asm__ __volatile__
(
"\tmrc p15, 0, %0, c0, c0, 0"
: "=r" (id)
:
: "memory"
);
return id;
}
/* Read/write the system control register (SCTLR) */
static inline unsigned int cp15_rdsctlr(void)
{
unsigned int sctlr;
__asm__ __volatile__
(
"\tmrc p15, 0, %0, c1, c0, 0\n"
: "=r" (sctlr)
:
: "memory"
);
return sctlr;
}
static inline void cp15_wrsctlr(unsigned int sctlr)
{
__asm__ __volatile__
(
"\tmcr p15, 0, %0, c1, c0, 0\n"
"\tnop\n"
"\tnop\n"
"\tnop\n"
"\tnop\n"
"\tnop\n"
"\tnop\n"
"\tnop\n"
"\tnop\n"
:
: "r" (sctlr)
: "memory"
);
}
/* Read/write the vector base address register (VBAR) */
static inline unsigned int cp15_rdvbar(void)
{
unsigned int sctlr;
__asm__ __volatile__
(
"\tmrc p15, 0, %0, c12, c0, 0\n"
: "=r" (sctlr)
:
: "memory"
);
return sctlr;
}
static inline void cp15_wrvbar(unsigned int sctlr)
{
__asm__ __volatile__
(
"\tmcr p15, 0, %0, c12, c0, 0\n"
:
: "r" (sctlr)
: "memory"
);
}
#endif /* __ASSEMBLY__ */
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifndef __ASSEMBLY__
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_ARM_SRC_ARMV7_A_SCTLR_H */
