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More paging stuff.

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The test userspace process now runs at linear address 0x300000 which is
mapped to a dynamically allocated page from the MemoryManager. Cool!
This commit is contained in:
Andreas Kling 2018-10-18 13:05:00 +02:00
parent 89851a9ded
commit f67d695254
10 changed files with 339 additions and 66 deletions
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43
Kernel/i386.cpp
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@ -4,6 +4,7 @@
#include "i386.h"
#include "Assertions.h"
#include "Task.h"
#include "MemoryManager.h"
struct DescriptorTablePointer {
WORD size;
@ -67,8 +68,8 @@ asm( \
" iret\n" \
);
EH_ENTRY(13)
// 13: General Protection Fault
EH_ENTRY(13);
void exception_13_handler()
{
auto& regs = *reinterpret_cast<RegisterDump*>(exception_state_dump);
@ -88,6 +89,42 @@ void exception_13_handler()
Task::taskDidCrash(current);
}
// 14: Page Fault
EH_ENTRY(14);
void exception_14_handler()
{
dword faultAddress;
asm ("movl %%cr2, %%eax":"=a"(faultAddress));
auto& regs = *reinterpret_cast<RegisterDump*>(exception_state_dump);
kprintf("%s page fault: %u(%s), %s laddr=%p\n",
current->isRing0() ? "Kernel" : "User",
current->pid(),
current->name().characters(),
exception_code & 2 ? "write" : "read",
faultAddress);
kprintf("exception code: %w\n", 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("eax=%x ebx=%x ecx=%x edx=%x\n", regs.eax, regs.ebx, regs.ecx, regs.edx);
kprintf("ebp=%x esp=%x esi=%x edi=%x\n", regs.ebp, regs.esp, regs.esi, regs.edi);
if (current->isRing0())
HANG;
auto response = MemoryManager::the().handlePageFault(PageFault(exception_code, LinearAddress(faultAddress)));
if (response == PageFaultResponse::ShouldCrash) {
kprintf("Crashing after unresolved page fault\n");
// NOTE: This will schedule a new task.
Task::taskDidCrash(current);
} else if (response == PageFaultResponse::Continue) {
kprintf("Continuing after resolved page fault\n");
} else {
ASSERT_NOT_REACHED();
}
}
#define EH(i, msg) \
static void _exception ## i () \
{ \
@ -227,7 +264,7 @@ void idt_init()
registerInterruptHandler(0x0b, _exception11);
registerInterruptHandler(0x0c, _exception12);
registerInterruptHandler(0x0d, exception_13_entry);
registerInterruptHandler(0x0e, _exception14);
registerInterruptHandler(0x0e, exception_14_entry);
registerInterruptHandler(0x0f, _exception15);
registerInterruptHandler(0x10, _exception16);