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32 lines
580 B
32 lines
580 B
// See LICENSE for license details.
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#include "pk.h"
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#include "atomic.h"
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#include "frontend.h"
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#include <stdint.h>
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sysret_t frontend_syscall(long n, long a0, long a1, long a2, long a3)
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{
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static volatile uint64_t magic_mem[8];
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static spinlock_t lock = SPINLOCK_INIT;
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spinlock_lock(&lock);
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magic_mem[0] = n;
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magic_mem[1] = a0;
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magic_mem[2] = a1;
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magic_mem[3] = a2;
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magic_mem[4] = a3;
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mb();
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write_csr(tohost, magic_mem);
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while (swap_csr(fromhost, 0) == 0);
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mb();
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sysret_t ret = {magic_mem[0],magic_mem[1]};
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spinlock_unlock(&lock);
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return ret;
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}
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