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Cortex-M archs support option memory protection unit (MPU). MPU is used to set the memory types, attributes, access permissions for different regions, cache policies of the device. e.g. using MPU it is possible to configure memory region as device memory or strongly ordered, memory attributes like execute never, cache policies like write-back or write-through. Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/*
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* (C) Copyright 2010,2011
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* Vladimir Khusainov, Emcraft Systems, vlad@emcraft.com
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*
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* (C) Copyright 2015
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* Kamil Lulko, <kamil.lulko@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef ARMV7M_H
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#define ARMV7M_H
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#if defined(__ASSEMBLY__)
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.syntax unified
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.thumb
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#endif
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/* armv7m fixed base addresses */
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#define V7M_SCS_BASE 0xE000E000
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#define V7M_NVIC_BASE (V7M_SCS_BASE + 0x0100)
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#define V7M_SCB_BASE (V7M_SCS_BASE + 0x0D00)
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#define V7M_PROC_FTR_BASE (V7M_SCS_BASE + 0x0D78)
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#define V7M_MPU_BASE (V7M_SCS_BASE + 0x0D90)
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#define V7M_FPU_BASE (V7M_SCS_BASE + 0x0F30)
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#define V7M_CACHE_MAINT_BASE (V7M_SCS_BASE + 0x0F50)
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#define V7M_ACCESS_CNTL_BASE (V7M_SCS_BASE + 0x0F90)
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#define V7M_SCB_VTOR 0x08
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#if !defined(__ASSEMBLY__)
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struct v7m_scb {
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uint32_t cpuid; /* CPUID Base Register */
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uint32_t icsr; /* Interrupt Control and State Register */
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uint32_t vtor; /* Vector Table Offset Register */
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uint32_t aircr; /* App Interrupt and Reset Control Register */
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uint32_t scr; /* offset 0x10: System Control Register */
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uint32_t ccr; /* offset 0x14: Config and Control Register */
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uint32_t shpr1; /* offset 0x18: System Handler Priority Reg 1 */
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uint32_t shpr2; /* offset 0x1c: System Handler Priority Reg 2 */
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uint32_t shpr3; /* offset 0x20: System Handler Priority Reg 3 */
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uint32_t shcrs; /* offset 0x24: System Handler Control State */
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uint32_t cfsr; /* offset 0x28: Configurable Fault Status Reg */
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uint32_t hfsr; /* offset 0x2C: HardFault Status Register */
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uint32_t res; /* offset 0x30: reserved */
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uint32_t mmar; /* offset 0x34: MemManage Fault Address Reg */
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uint32_t bfar; /* offset 0x38: BusFault Address Reg */
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uint32_t afsr; /* offset 0x3C: Auxiliary Fault Status Reg */
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};
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#define V7M_SCB ((struct v7m_scb *)V7M_SCB_BASE)
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#define V7M_AIRCR_VECTKEY 0x5fa
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#define V7M_AIRCR_VECTKEY_SHIFT 16
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#define V7M_AIRCR_ENDIAN (1 << 15)
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#define V7M_AIRCR_PRIGROUP_SHIFT 8
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#define V7M_AIRCR_PRIGROUP_MSK (0x7 << V7M_AIRCR_PRIGROUP_SHIFT)
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#define V7M_AIRCR_SYSRESET (1 << 2)
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#define V7M_ICSR_VECTACT_MSK 0xFF
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#define V7M_CCR_DCACHE 16
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#define V7M_CCR_ICACHE 17
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struct v7m_mpu {
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uint32_t type; /* Type Register */
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uint32_t ctrl; /* Control Register */
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uint32_t rnr; /* Region Number Register */
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uint32_t rbar; /* Region Base Address Register */
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uint32_t rasr; /* Region Attribute and Size Register */
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};
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#define V7M_MPU ((struct v7m_mpu *)V7M_MPU_BASE)
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#endif /* !defined(__ASSEMBLY__) */
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#endif /* ARMV7M_H */
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