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device/arm: add support for System Control Block (SCB) registers and SystemReset() function

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Signed-off-by: Ron Evans <ron@hybridgroup.com>
This commit is contained in:
Ron Evans
2019-09-06 15:40:20 +02:00
committed by Ayke
parent 656fb4e372
commit 6c1abfe047
1 changed files with 31 additions and 0 deletions
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src/device/arm/arm.go
+31
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@@ -73,8 +73,32 @@ func SVCall4(num uintptr, a1, a2, a3, a4 interface{}) uintptr
const (
SCS_BASE = 0xE000E000
NVIC_BASE = SCS_BASE + 0x0100
SCB_BASE = SCS_BASE + 0x0D00
)
const (
SCB_AIRCR_VECTKEY_Pos = 16
SCB_AIRCR_SYSRESETREQ_Pos = 2
SCB_AIRCR_SYSRESETREQ_Msk = 1 << SCB_AIRCR_SYSRESETREQ_Pos
)
// System Control Block (SCB)
//
// SCB_Type provides the definitions for the System Control Block Registers.
type SCB_Type struct {
CPUID volatile.Register32 // CPUID Base Register
ICSR volatile.Register32 // Interrupt Control and State Register
VTOR volatile.Register32 // Vector Table Offset Register
AIRCR volatile.Register32 // Application Interrupt and Reset Control Register
SCR volatile.Register32 // System Control Register
CCR volatile.Register32 // Configuration Control Register
_ volatile.Register32 // RESERVED1;
SHP [2]volatile.Register32 // System Handlers Priority Registers. [0] is RESERVED
SHCSR volatile.Register32 // System Handler Control and State Register
}
var SCB = (*SCB_Type)(unsafe.Pointer(uintptr(SCB_BASE)))
// Nested Vectored Interrupt Controller (NVIC).
//
// Source:
@@ -134,3 +158,10 @@ func DisableInterrupts() uintptr {
func EnableInterrupts(mask uintptr) {
Asm("cpsie if")
}
// SystemReset performs a hard system reset.
func SystemReset() {
// SCB->AIRCR = ((0x5FA << SCB_AIRCR_VECTKEY_Pos) |
// SCB_AIRCR_SYSRESETREQ_Msk);
SCB.AIRCR.Set((0x5FA << SCB_AIRCR_VECTKEY_Pos) | SCB_AIRCR_SYSRESETREQ_Msk)
}