blob: 1c3c3e63a38c118ec62b1676f0daba5592dfd412 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
package riscv
// Run the given assembly code. The code will be marked as having side effects,
// as it doesn't produce output and thus would normally be eliminated by the
// optimizer.
func Asm(asm string)
// Run the given inline assembly. The code will be marked as having side
// effects, as it would otherwise be optimized away. The inline assembly string
// recognizes template values in the form {name}, like so:
//
// arm.AsmFull(
// "st {value}, {result}",
// map[string]interface{}{
// "value": 1
// "result": &dest,
// })
//
// You can use {} in the asm string (which expands to a register) to set the
// return value.
func AsmFull(asm string, regs map[string]interface{}) uintptr
// DisableInterrupts disables all interrupts, and returns the old interrupt
// state.
func DisableInterrupts() uintptr {
// Note: this can be optimized with a CSRRW instruction, which atomically
// swaps the value and returns the old value.
mask := MSTATUS.Get()
MSTATUS.ClearBits(1 << 3) // clear the MIE bit
return mask
}
// EnableInterrupts enables all interrupts again. The value passed in must be
// the mask returned by DisableInterrupts.
func EnableInterrupts(mask uintptr) {
mask &= 1 << 3 // clear all bits except for the MIE bit
MSTATUS.SetBits(mask) // set the MIE bit, if it was previously cleared
}
|
