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[MEMORY] Procmm page fault handler

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This commit is contained in:
Thomas Lovén
2016-12-19 14:16:20 +01:00
parent 0101440894
commit aa50bbcd0f
3 changed files with 38 additions and 0 deletions
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28
kernel/proc/procmm.c
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@@ -1,6 +1,9 @@
#include <scheduler.h>
#include <list.h>
#include <debug.h>
#include <int.h>
#include <cpu.h>
#include <registers.h>
procmm_mmap_t *procmm_new_map(process_t *proc, procmm_mmap_t *src)
{
@@ -112,3 +115,28 @@ uintptr_t procmm_setup(process_t *proc)
return brk_start;
}
registers_t *procmm_page_fault(registers_t *r)
{
procmm_mmap_t *map = get_current_process()->mmap;
uintptr_t addr = read_cr2();
// We don't want to handle stuff in the kernel
if(addr >= KERNEL_OFFSET)
return 0;
// Check if we're close to the stack
if(map->stack)
{
if(map->stack->start <= addr + PAGE_SIZE)
{
debug("Increase user stack\n");
map->stack->start = map->stack->start - PAGE_SIZE;
vmm_set_page(map->P4, map->stack->start, pmm_alloc(), PAGE_PRESENT | PAGE_WRITE | PAGE_USER);
return r;
}
}
// If we reach this point, procmm couldn't handle the page fault
return 0;
}