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//go:build tinygo.riscv
package runtime
import "device/riscv"
const deferExtraRegs = 0
const callInstSize = 4 // 8 without relaxation, maybe 4 with relaxation
// RISC-V has a maximum alignment of 16 bytes (both for RV32 and for RV64).
// Source: https://riscv.org/wp-content/uploads/2015/01/riscv-calling.pdf
func align(ptr uintptr) uintptr {
return (ptr + 15) &^ 15
}
func getCurrentStackPointer() uintptr {
return uintptr(stacksave())
}
// The safest thing to do here would just be to disable interrupts for
// procPin/procUnpin. Note that a global variable is safe in this case, as any
// access to procPinnedMask will happen with interrupts disabled.
var procPinnedMask uintptr
//go:linkname procPin sync/atomic.runtime_procPin
func procPin() {
procPinnedMask = riscv.DisableInterrupts()
}
//go:linkname procUnpin sync/atomic.runtime_procUnpin
func procUnpin() {
riscv.EnableInterrupts(procPinnedMask)
}
func waitForEvents() {
mask := riscv.DisableInterrupts()
if !runqueue.Empty() {
riscv.Asm("wfi")
}
riscv.EnableInterrupts(mask)
}
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