164 lines
2.1 KiB
C
164 lines
2.1 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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if(n < 0)
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n = 0;
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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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int
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sys_pgpte(void)
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{
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uint64 va;
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struct proc *p;
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p = myproc();
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argaddr(0, &va);
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pte_t *pte = pgpte(p->pagetable, va);
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if(pte != 0) {
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return (uint64) *pte;
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}
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return 0;
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}
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#endif
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#ifdef LAB_PGTBL
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int
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sys_kpgtbl(void)
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{
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struct proc *p;
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p = myproc();
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vmprint(p->pagetable);
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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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uint64
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sys_pgaccess(void)
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{
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uint64 va;
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int n;
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uint64 user_mask_addr;
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argaddr(0, &va);
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argint(1, &n);
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argaddr(2, &user_mask_addr);
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if (va < 0 || n < 0 || user_mask_addr < 0)
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return -1;
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if (n < 0 || n > 32)
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return -1;
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struct proc *p = myproc();
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uint64 mask = 0;
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for (int i = 0; i < n; i++) {
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uint64 v = va + i * PGSIZE;
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pte_t *pte = walk(p->pagetable, v, 0);
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if (!pte || (*pte & PTE_PS))
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continue;
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if ((*pte & PTE_V) && (*pte & PTE_A)) {
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mask |= (1 << i); // Set bit i in mask
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*pte &= ~PTE_A; // Clear the Accessed bit
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}
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}
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if (copyout(p->pagetable, user_mask_addr, (char*)&mask, sizeof(mask)) < 0)
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return -1;
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return 0;
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}
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