RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-26 10:47:35 +00:00
Code Issues Activity Actions

Support basic mmap'ing of a file!

Browse source 
All right, we can now mmap() a file and it gets magically paged in from fs
in response to an NP page fault. This is really cool :^)

I need to refactor this to support sharing of read-only file-backed pages,
but it's cool to just have something working.
This commit is contained in:
Andreas Kling 2018-11-08 12:59:16 +01:00
parent fdbd9f1e27
commit 3c8064a787
8 changed files with 141 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

12
Kernel/i386.cpp
View file

@ -188,10 +188,11 @@ void exception_14_handler(RegisterDumpWithExceptionCode& regs)
dword faultAddress;
asm ("movl %%cr2, %%eax":"=a"(faultAddress));
dbgprintf("Ring%u page fault in %s(%u), %s laddr=%p\n",
regs.cs & 3,
dbgprintf("%s(%u): ring%u %s page fault, %s L%x\n",
current->name().characters(),
current->pid(),
regs.cs & 3,
regs.exception_code & 1 ? "PV" : "NP",
regs.exception_code & 2 ? "write" : "read",
faultAddress);
@ -231,7 +232,12 @@ void exception_14_handler(RegisterDumpWithExceptionCode& regs)
auto response = MM.handle_page_fault(PageFault(regs.exception_code, LinearAddress(faultAddress)));
if (response == PageFaultResponse::ShouldCrash) {
kprintf("Crashing after unresolved page fault\n");
kprintf("%s(%u) unrecoverable page fault, %s laddr=%p\n",
current->name().characters(),
current->pid(),
regs.exception_code & 2 ? "write" : "read",
faultAddress);
kprintf("exception code: %w\n", regs.exception_code);
kprintf("pc=%w:%x ds=%w es=%w fs=%w gs=%w\n", regs.cs, regs.eip, regs.ds, regs.es, regs.fs, regs.gs);
kprintf("stk=%w:%x\n", ss, esp);