src/device/arm: add ARM v7-M MPU support

src/device/arm/mpu.go

@@ -0,0 +1,143 @@
+//go:build cortexm
+
+package arm
+
+import (
+	"runtime/volatile"
+	"unsafe"
+)
+
+/*
+The struct below has been created using gen-device-svd
+on cortex_m/armv7em.yaml from stm32-rs.
+The MPU type has been included as some stm32 svd files
+do not contain MPU definitions.
+*/
+
+const MPU_BASE = SCS_BASE + 0x0D90
+
+// Memory Protection Unit
+type MPU_Type struct {
+	TYPE    volatile.Register32 // 0x0
+	CTRL    volatile.Register32 // 0x4
+	RNR     volatile.Register32 // 0x8
+	RBAR    volatile.Register32 // 0xC
+	RASR    volatile.Register32 // 0x10
+	RBAR_A1 volatile.Register32 // 0x14
+	RASR_A1 volatile.Register32 // 0x18
+	RBAR_A2 volatile.Register32 // 0x1C
+	RASR_A2 volatile.Register32 // 0x20
+	RBAR_A3 volatile.Register32 // 0x24
+	RASR_A3 volatile.Register32 // 0x28
+}
+
+var MPU = (*MPU_Type)(unsafe.Pointer(uintptr(MPU_BASE)))
+
+// Constants for MPU: Memory protection unit
+const (
+	// TYPER: MPU type register
+	// Position of SEPARATE field.
+	MPU_TYPER_SEPARATE_Pos = 0x0
+	// Bit mask of SEPARATE field.
+	MPU_TYPER_SEPARATE_Msk = 0x1
+	// Bit SEPARATE.
+	MPU_TYPER_SEPARATE = 0x1
+	// Position of DREGION field.
+	MPU_TYPER_DREGION_Pos = 0x8
+	// Bit mask of DREGION field.
+	MPU_TYPER_DREGION_Msk = 0xff00
+	// Position of IREGION field.
+	MPU_TYPER_IREGION_Pos = 0x10
+	// Bit mask of IREGION field.
+	MPU_TYPER_IREGION_Msk = 0xff0000
+
+	// CTRL: MPU control register
+	// Position of ENABLE field.
+	MPU_CTRL_ENABLE_Pos = 0x0
+	// Bit mask of ENABLE field.
+	MPU_CTRL_ENABLE_Msk = 0x1
+	// Bit ENABLE.
+	MPU_CTRL_ENABLE = 0x1
+	// Position of HFNMIENA field.
+	MPU_CTRL_HFNMIENA_Pos = 0x1
+	// Bit mask of HFNMIENA field.
+	MPU_CTRL_HFNMIENA_Msk = 0x2
+	// Bit HFNMIENA.
+	MPU_CTRL_HFNMIENA = 0x2
+	// Position of PRIVDEFENA field.
+	MPU_CTRL_PRIVDEFENA_Pos = 0x2
+	// Bit mask of PRIVDEFENA field.
+	MPU_CTRL_PRIVDEFENA_Msk = 0x4
+	// Bit PRIVDEFENA.
+	MPU_CTRL_PRIVDEFENA = 0x4
+
+	// RNR: MPU region number register
+	// Position of REGION field.
+	MPU_RNR_REGION_Pos = 0x0
+	// Bit mask of REGION field.
+	MPU_RNR_REGION_Msk = 0xff
+
+	// RBAR: MPU region base address register
+	// Position of REGION field.
+	MPU_RBAR_REGION_Pos = 0x0
+	// Bit mask of REGION field.
+	MPU_RBAR_REGION_Msk = 0xf
+	// Position of VALID field.
+	MPU_RBAR_VALID_Pos = 0x4
+	// Bit mask of VALID field.
+	MPU_RBAR_VALID_Msk = 0x10
+	// Bit VALID.
+	MPU_RBAR_VALID = 0x10
+	// Position of ADDR field.
+	MPU_RBAR_ADDR_Pos = 0x5
+	// Bit mask of ADDR field.
+	MPU_RBAR_ADDR_Msk = 0xffffffe0
+
+	// RASR: MPU region attribute and size register
+	// Position of ENABLE field.
+	MPU_RASR_ENABLE_Pos = 0x0
+	// Bit mask of ENABLE field.
+	MPU_RASR_ENABLE_Msk = 0x1
+	// Bit ENABLE.
+	MPU_RASR_ENABLE = 0x1
+	// Position of SIZE field.
+	MPU_RASR_SIZE_Pos = 0x1
+	// Bit mask of SIZE field.
+	MPU_RASR_SIZE_Msk = 0x3e
+	// Position of SRD field.
+	MPU_RASR_SRD_Pos = 0x8
+	// Bit mask of SRD field.
+	MPU_RASR_SRD_Msk = 0xff00
+	// Position of B field.
+	MPU_RASR_B_Pos = 0x10
+	// Bit mask of B field.
+	MPU_RASR_B_Msk = 0x10000
+	// Bit B.
+	MPU_RASR_B = 0x10000
+	// Position of C field.
+	MPU_RASR_C_Pos = 0x11
+	// Bit mask of C field.
+	MPU_RASR_C_Msk = 0x20000
+	// Bit C.
+	MPU_RASR_C = 0x20000
+	// Position of S field.
+	MPU_RASR_S_Pos = 0x12
+	// Bit mask of S field.
+	MPU_RASR_S_Msk = 0x40000
+	// Bit S.
+	MPU_RASR_S = 0x40000
+	// Position of TEX field.
+	MPU_RASR_TEX_Pos = 0x13
+	// Bit mask of TEX field.
+	MPU_RASR_TEX_Msk = 0x380000
+	// Position of AP field.
+	MPU_RASR_AP_Pos = 0x18
+	// Bit mask of AP field.
+	MPU_RASR_AP_Msk = 0x7000000
+	// Position of XN field.
+	MPU_RASR_XN_Pos = 0x1c
+	// Bit mask of XN field.
+	MPU_RASR_XN_Msk = 0x10000000
+	// Bit XN.
+	MPU_RASR_XN = 0x10000000
+)