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35 lines
682 B
35 lines
682 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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long frontend_syscall(long n, long a0, long a1, long a2, long a3, long a4, long a5, long a6)
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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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long irq = spinlock_lock_irqsave(&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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magic_mem[5] = a4;
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magic_mem[6] = a5;
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magic_mem[7] = a6;
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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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long ret = magic_mem[0];
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spinlock_unlock_irqrestore(&lock, irq);
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return ret;
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}
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