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Let kernel handle its own page faults

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This commit is contained in:
Gleb Koval
2024-11-08 01:18:17 +00:00
parent 7d9900c6d8
commit 83e044cf68
1 changed files with 8 additions and 0 deletions
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8
src/userprog/exception.c
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@@ -145,6 +145,14 @@ page_fault (struct intr_frame *f)
write = (f->error_code & PF_W) != 0; write = (f->error_code & PF_W) != 0;
user = (f->error_code & PF_U) != 0; user = (f->error_code & PF_U) != 0;
/* Kernel page fault is further handled by the kernel itself. */
if (!user)
{
f->eip = (void *)f->eax;
f->eax = 0xffffffff;
return;
}
/* To implement virtual memory, delete the rest of the function /* To implement virtual memory, delete the rest of the function
body, and replace it with code that brings in the page to body, and replace it with code that brings in the page to
which fault_addr refers. */ which fault_addr refers. */