blob: 3771bca661afc86cbd8ffaf1a49e4c9980c631c0 (
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
|
// See LICENSE for license details.
#include "pk.h"
#include "atomic.h"
#include "frontend.h"
#include <stdint.h>
long frontend_syscall(long n, long a0, long a1, long a2, long a3, long a4, long a5, long a6)
{
static volatile uint64_t magic_mem[8];
static spinlock_t lock = SPINLOCK_INIT;
long irq = spinlock_lock_irqsave(&lock);
magic_mem[0] = n;
magic_mem[1] = a0;
magic_mem[2] = a1;
magic_mem[3] = a2;
magic_mem[4] = a3;
magic_mem[5] = a4;
magic_mem[6] = a5;
magic_mem[7] = a6;
mb();
write_csr(tohost, magic_mem);
while (swap_csr(fromhost, 0) == 0);
mb();
long ret = magic_mem[0];
spinlock_unlock_irqrestore(&lock, irq);
return ret;
}
|