122 lines
1.7 KiB
C
122 lines
1.7 KiB
C
#include "types.h"
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#include "riscv.h"
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#include "param.h"
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#include "defs.h"
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#include "memlayout.h"
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#include "spinlock.h"
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#include "proc.h"
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uint64
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sys_exit(void)
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{
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int n;
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argint(0, &n);
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exit(n);
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return 0; // not reached
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}
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uint64
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sys_getpid(void)
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{
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return myproc()->pid;
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}
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uint64
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sys_fork(void)
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{
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return fork();
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}
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uint64
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sys_wait(void)
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{
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uint64 p;
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argaddr(0, &p);
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return wait(p);
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}
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uint64
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sys_sbrk(void)
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{
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uint64 addr;
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int n;
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argint(0, &n);
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addr = myproc()->sz;
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if(growproc(n) < 0)
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return -1;
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return addr;
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}
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uint64
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sys_sleep(void)
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{
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int n;
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uint ticks0;
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argint(0, &n);
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acquire(&tickslock);
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ticks0 = ticks;
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while(ticks - ticks0 < n){
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if(killed(myproc())){
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release(&tickslock);
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return -1;
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}
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sleep(&ticks, &tickslock);
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}
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release(&tickslock);
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return 0;
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}
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#ifdef LAB_PGTBL
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#define MAX_ABITS (64)
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int
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sys_pgaccess(void)
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{
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char access_bits[MAX_ABITS / 8] = {0};
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uint64 base;
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int pages;
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uint64 mask;
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argaddr(0, &base); // void*
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argint(1, &pages); // int
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argaddr(2, &mask); // void*
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if (pages > MAX_ABITS) return -1;
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acquire(&myproc()->lock);
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for (int page = 0; page < pages; ++ page) {
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pte_t* pte = walk(myproc()->pagetable, base + (page << PGSHIFT), 0);
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if (*pte & PTE_A) {
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*pte &= ~PTE_A;
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access_bits[page / 8] |= 1 << (page & 0x7);
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}
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}
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release(&myproc()->lock);
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copyout(myproc()->pagetable, mask, access_bits, (pages & 0x7) ? (pages >> 3) + 1 : (pages >> 3));
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return 0;
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}
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#endif
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uint64
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sys_kill(void)
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{
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int pid;
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argint(0, &pid);
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return kill(pid);
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}
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// return how many clock tick interrupts have occurred
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// since start.
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uint64
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sys_uptime(void)
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{
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uint xticks;
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acquire(&tickslock);
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xticks = ticks;
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release(&tickslock);
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return xticks;
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}
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