I am trying to handle page faults exceptions in the kernel using the
task gate mechanism. I succeeded to transfer the execution to my page
fault handler using a new TSS and updates to the GDT and IDT tables
(similar to the double fault mechanism in 2.6). After handling the fault
and allocating the physical page I use the iret instruction to switch
back to the previous task. The problem is that I got a double fault with
the same address that cause the fault (although the physical page is
allocated and mapped). Any clues?
The new page fault TSS:
struct tss_struct pagefault_tss __cacheline_aligned = {
.esp0 = STACK_START,
.ss0 = __KERNEL_DS,
.ldt = 0,
.io_bitmap_base = INVALID_IO_BITMAP_OFFSET,
.eip = (unsigned long) pagefault_fn,
.eflags = X86_EFLAGS_SF|0x2,/* 0x2 bit is always set */
.esp = STACK_START,
.es = __USER_DS,
.cs = __KERNEL_CS,
.ss = __KERNEL_DS,
.ds = __USER_DS,
.__cr3 = __pa(swapper_pg_dir)
};
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