Exemplo n.º 1
0
void __init efi_call_phys_epilog(void)
{
	struct desc_ptr gdt_descr;

#ifdef CONFIG_PAX_KERNEXEC
	struct desc_struct d;

	memset(&d, 0, sizeof d);
	write_gdt_entry(get_cpu_gdt_table(0), GDT_ENTRY_KERNEXEC_EFI_CS, &d, DESCTYPE_S);
	write_gdt_entry(get_cpu_gdt_table(0), GDT_ENTRY_KERNEXEC_EFI_DS, &d, DESCTYPE_S);
#endif

	gdt_descr.address = (unsigned long)get_cpu_gdt_table(0);
	gdt_descr.size = GDT_SIZE - 1;
	load_gdt(&gdt_descr);

#ifdef CONFIG_PAX_PER_CPU_PGD
	load_cr3(get_cpu_pgd(smp_processor_id(), kernel));
#else
	load_cr3(swapper_pg_dir);
#endif

	__flush_tlb_all();

	local_irq_restore(efi_rt_eflags);
}
Exemplo n.º 2
0
Arquivo: kernel.c Projeto: candraw/fOS
void init_kernel() 
{
    terminal_initialize();

    init_serial(COM1);
    terminal_enable_serial_echo(COM1);

    terminal_printf("fOS version %s\n\n\n", KERNEL_VERSION);

    kinit(end + 4096, end + 4096 + (100 * 4096));

    init_gdt();
    load_gdt();


    load_idt();
    load_isrs();

    irq_install();
    asm volatile ( "sti" );

    timer_install();
    sleep(1);

    keyboard_install();

    init_paging();
    switch_to_paging();
}
Exemplo n.º 3
0
void efi_call_phys_epilog(void)
{
	unsigned long cr4;
	struct desc_ptr gdt_descr;

	gdt_descr.address = (unsigned long)get_cpu_gdt_table(0);
	gdt_descr.size = GDT_SIZE - 1;
	load_gdt(&gdt_descr);

	cr4 = read_cr4();

	if (cr4 & X86_CR4_PAE) {
		swapper_pg_dir[pgd_index(0)].pgd =
		    efi_bak_pg_dir_pointer[0].pgd;
	} else {
		swapper_pg_dir[pgd_index(0)].pgd =
		    efi_bak_pg_dir_pointer[0].pgd;
		swapper_pg_dir[pgd_index(0x400000)].pgd =
		    efi_bak_pg_dir_pointer[1].pgd;
	}

	/*
	 * After the lock is released, the original page table is restored.
	 */
	__flush_tlb_all();

	local_irq_restore(efi_rt_eflags);
}
Exemplo n.º 4
0
/* 
 * ReBuild the initial GDT separating  the kernel from the user memory
 * area.
 *
 * See the memory layout in the linker script.
 *
 * Kernel code  starts at 0x100000 (1MB), and is 1 MB long
 * Kernel data  starts at 0x200000 (2MB), and is 1 MB long
 * Kernel stack starts at 0x400000 (4MB), and is 1 MB long
 * (Stack grows downwards from 0x400000 to 0x300000)
 *
 * But  there are  other memory  areas,  esp.  low  ones (e.g.   Video
 * memory), that we need to  access.  So the kernel data _segment_ has
 * to start from lowest memory. :-).
 *
 * User area  starts from 0x401000 (4MB  start offset of  stack, and 1
 * page size  length), and is  to the end  of the memory.   Define two
 * segments   that    overlap.    We   need    to   control   specific
 * allocation. :-).
 *
 * For the moment, merging stack and data segments ...
 *    => kernel code seg starts at 0, and ends at 2 MB!
 *    => kernel data+stack seg starts at 2MB and is 2 MB long
 */
int
initialise_gdt_with_disjoint_kernel_and_user_memory (void)
{
  int retval = FALSE;
  int i = 0;

  for (i = 0; i < 8192; i++)
    global_descriptor_table[i].descriptor = 0;

  i = set_total_gdt_entries (0);

  retval = make_descriptor(0,
			   0,
			   NULL_DESCRIPTOR_FLAGS,
			   0
			   );

  i = inc_total_gdt_entries ();

  /* RING_0, DESC_CODEDATA, SEG_EXECUTE_READ, */
  retval = make_descriptor ((MEMORYORIGIN),
			    ((KERNELCODESTART + KERNELCODELENGTH)),
			    RING_0_CODEDATA_DESC_READ_EXECUTE,
			    1
			    );
   
  i = inc_total_gdt_entries ();

  /* RING_0, DESC_CODEDATA, SEG_READ_WRITE, */
  retval = make_descriptor ((MEMORYORIGIN),
			    (TOTALKERNEL),
			    RING_0_CODEDATA_DESC_READ_WRITE,
			    2
			    );
  
  i = inc_total_gdt_entries ();

  /* RING_3, DESC_CODEDATA, SEG_EXECUTE_READ, */
  retval = make_descriptor ((USERMEMORYSTART),
			    MAXMEMPAGES,
			    RING_3_CODEDATA_DESC_READ_EXECUTE,
			    3
			    );

  i = inc_total_gdt_entries ();

  /* RING_3, DESC_CODEDATA, SEG_READ_WRITE, */
  retval = make_descriptor ((USERMEMORYSTART),
			    MAXMEMPAGES,
			    RING_3_CODEDATA_DESC_READ_WRITE,
			    4
			    );

  i = get_total_gdt_entries ();

  load_gdt ();	   /* Could some status flags tell us if we did ok? */

  return retval;
}
Exemplo n.º 5
0
Arquivo: gdt.c Projeto: paalka/zero
void gdt_init(void)
{
    struct gdt_ptr gdt_ptr;

    gdt_ptr.base = (unsigned long) GDT;
    gdt_ptr.limit = sizeof(GDT);

    load_gdt(&gdt_ptr);
}
static void set_gdt(void *newgdt, __u16 limit)
{
	struct desc_ptr curgdt;

	/* ia32 supports unaligned loads & stores */
	curgdt.size    = limit;
	curgdt.address = (unsigned long)newgdt;

	load_gdt(&curgdt);
}
Exemplo n.º 7
0
void __init efi_call_phys_epilog(pgd_t *save_pgd)
{
	struct desc_ptr gdt_descr;

	gdt_descr.address = (unsigned long)get_cpu_gdt_table(0);
	gdt_descr.size = GDT_SIZE - 1;
	load_gdt(&gdt_descr);

	load_cr3(save_pgd);
	__flush_tlb_all();
}
Exemplo n.º 8
0
/*
 * Current gdt points %fs at the "master" per-cpu area: after this,
 * it's on the real one.
 */
void switch_to_new_gdt(int cpu)
{
	struct desc_ptr gdt_descr;

	gdt_descr.address = (long)get_cpu_gdt_table(cpu);
	gdt_descr.size = GDT_SIZE - 1;
	load_gdt(&gdt_descr);

	/* Reload the per-cpu base */
	load_percpu_segment(cpu);
}
Exemplo n.º 9
0
void initialize_gdt()
{
    struct desc_ptr desc_ptr;

    gdt_entries[GDT_ENTRY_KERNEL_CS] = FULL_EXEC_SEGMENT;
    gdt_entries[GDT_ENTRY_KERNEL_DS] = FULL_SEGMENT;

    desc_ptr.size = sizeof(gdt_entries);
    desc_ptr.address = (long)(&gdt_entries);

    load_gdt(&desc_ptr);
}
Exemplo n.º 10
0
void set_gdtr(void)
{
	set_gdt(&gdt[0], 0, 0, 0, 0, 0, 0, 0, 0, 0);
	set_gdt(&gdt[1], 0, 0x0FFFFF, 1, 0, 1, 10, 1, 1, 1);
	set_gdt(&gdt[2], 0, 0x0FFFFF, 1, 0, 1,  2, 1, 1, 1);

	gdtr.size	= NUM_GDT * sizeof( SEGMENT_DESCRIPTOR );
	gdtr.base	= ( SEGMENT_DESCRIPTOR *)gdt;

	load_gdt();
	flush_pipeline();
}
Exemplo n.º 11
0
pgd_t * __init efi_call_phys_prolog(void)
{
	struct desc_ptr gdt_descr;
	pgd_t *save_pgd;

	/* Current pgd is swapper_pg_dir, we'll restore it later: */
	save_pgd = swapper_pg_dir;
	load_cr3(initial_page_table);
	__flush_tlb_all();

	gdt_descr.address = __pa(get_cpu_gdt_table(0));
	gdt_descr.size = GDT_SIZE - 1;
	load_gdt(&gdt_descr);

	return save_pgd;
}
Exemplo n.º 12
0
void __init efi_call_phys_epilog(void)
{
	struct desc_ptr gdt_descr;

	gdt_descr.address = get_cpu_gdt_table(0);
	gdt_descr.size = GDT_SIZE - 1;
	load_gdt(&gdt_descr);

	clone_pgd_range(swapper_pg_dir, efi_bak_pg_dir_pointer, KERNEL_PGD_PTRS);

	/*
	 * After the lock is released, the original page table is restored.
	 */
	__flush_tlb_all();

	local_irq_restore(efi_rt_eflags);
}
Exemplo n.º 13
0
static void __restore_processor_state(struct saved_context *ctxt)
{
	/*
	 * control registers
	 */
	/* cr4 was introduced in the Pentium CPU */
	if (ctxt->cr4)
		write_cr4(ctxt->cr4);
	write_cr3(ctxt->cr3);
	write_cr2(ctxt->cr2);
	write_cr0(ctxt->cr0);

	/*
	 * now restore the descriptor tables to their proper values
	 * ltr is done i fix_processor_context().
	 */
	load_gdt(&ctxt->gdt);
	load_idt(&ctxt->idt);

	/*
	 * segment registers
	 */
	loadsegment(es, ctxt->es);
	loadsegment(fs, ctxt->fs);
	loadsegment(gs, ctxt->gs);
	loadsegment(ss, ctxt->ss);

	/*
	 * sysenter MSRs
	 */
	if (boot_cpu_has(X86_FEATURE_SEP))
		enable_sep_cpu();

	/*
	 * restore XCR0 for xsave capable cpu's.
	 */
	if (cpu_has_xsave)
		xsetbv(XCR_XFEATURE_ENABLED_MASK, pcntxt_mask);

	fix_processor_context();
	do_fpu_end();
	mtrr_ap_init();
	mcheck_init(&boot_cpu_data);
}
Exemplo n.º 14
0
void __init efi_call_phys_prelog(void)
{
	struct desc_ptr gdt_descr;

	local_irq_save(efi_rt_eflags);


	clone_pgd_range(efi_bak_pg_dir_pointer, swapper_pg_dir, KERNEL_PGD_PTRS);
	clone_pgd_range(swapper_pg_dir, swapper_pg_dir + KERNEL_PGD_BOUNDARY,
			min_t(unsigned long, KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));

	/*
	 * After the lock is released, the original page table is restored.
	 */
	__flush_tlb_all();

	gdt_descr.address = (struct desc_struct *)__pa(get_cpu_gdt_table(0));
	gdt_descr.size = GDT_SIZE - 1;
	load_gdt(&gdt_descr);
}
Exemplo n.º 15
0
void efi_call_phys_prelog(void)
{
	unsigned long cr4;
	unsigned long temp;
	struct desc_ptr gdt_descr;

	local_irq_save(efi_rt_eflags);

	/*
	 * If I don't have PAE, I should just duplicate two entries in page
	 * directory. If I have PAE, I just need to duplicate one entry in
	 * page directory.
	 */
	cr4 = read_cr4();

	if (cr4 & X86_CR4_PAE) {
		efi_bak_pg_dir_pointer[0].pgd =
		    swapper_pg_dir[pgd_index(0)].pgd;
		swapper_pg_dir[0].pgd =
		    swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
	} else {
		efi_bak_pg_dir_pointer[0].pgd =
		    swapper_pg_dir[pgd_index(0)].pgd;
		efi_bak_pg_dir_pointer[1].pgd =
		    swapper_pg_dir[pgd_index(0x400000)].pgd;
		swapper_pg_dir[pgd_index(0)].pgd =
		    swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
		temp = PAGE_OFFSET + 0x400000;
		swapper_pg_dir[pgd_index(0x400000)].pgd =
		    swapper_pg_dir[pgd_index(temp)].pgd;
	}

	/*
	 * After the lock is released, the original page table is restored.
	 */
	__flush_tlb_all();

	gdt_descr.address = __pa(get_cpu_gdt_table(0));
	gdt_descr.size = GDT_SIZE - 1;
	load_gdt(&gdt_descr);
}
Exemplo n.º 16
0
// Name: initialize_gdt
// Description: This function will create the global descriptor table and then loads the GDTR
// Parameter: -
// Return: - 
void initialize_gdt()
{

	struct descriptor null_entry, cs_entry, ds_entry;
	gdptr.base_address = (unsigned int)&global_desc_table;
	gdptr.size =(unsigned short int) sizeof(struct descriptor_table_entry)*3 - 1;	

	

	null_entry = getDescriptor(0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
	global_desc_table[0] = descriptortotableentry(null_entry);
	cs_entry = getDescriptor(0, 0xFFFFFFFF, 10, 1, 0, 0, 1, 1, 0, 1 );
	global_desc_table[1] = descriptortotableentry(cs_entry);
	ds_entry = getDescriptor(0, 0xFFFFFFFF, 2, 1, 0, 0, 1, 1, 0, 1 );
	global_desc_table[2] = descriptortotableentry(ds_entry);

	//putc('x');

	load_gdt();

	return;
}
Exemplo n.º 17
0
void __restore_processor_state(struct saved_context *ctxt)
{
	/*
	 * control registers
	 */
	write_cr4(ctxt->cr4);
	write_cr3(ctxt->cr3);
	write_cr2(ctxt->cr2);
	write_cr2(ctxt->cr0);

	/*
	 * now restore the descriptor tables to their proper values
	 * ltr is done i fix_processor_context().
	 */
 	load_gdt(&ctxt->gdt_limit);
 	load_idt(&ctxt->idt_limit);

	/*
	 * segment registers
	 */
 	loadsegment(es, ctxt->es);
 	loadsegment(fs, ctxt->fs);
 	loadsegment(gs, ctxt->gs);
 	loadsegment(ss, ctxt->ss);

#ifdef CONFIG_SYSENTER
	/*
	 * sysenter MSRs
	 */
	if (boot_cpu_has(X86_FEATURE_SEP))
		enable_sep_cpu();
#endif

	fix_processor_context();
	do_fpu_end();
	mtrr_ap_init();
}
Exemplo n.º 18
0
void __init efi_call_phys_prolog(void)
{
	struct desc_ptr gdt_descr;

#ifdef CONFIG_PAX_KERNEXEC
	struct desc_struct d;
#endif

	local_irq_save(efi_rt_eflags);

	load_cr3(initial_page_table);
	__flush_tlb_all();

#ifdef CONFIG_PAX_KERNEXEC
	pack_descriptor(&d, 0, 0xFFFFF, 0x9B, 0xC);
	write_gdt_entry(get_cpu_gdt_table(0), GDT_ENTRY_KERNEXEC_EFI_CS, &d, DESCTYPE_S);
	pack_descriptor(&d, 0, 0xFFFFF, 0x93, 0xC);
	write_gdt_entry(get_cpu_gdt_table(0), GDT_ENTRY_KERNEXEC_EFI_DS, &d, DESCTYPE_S);
#endif

	gdt_descr.address = __pa(get_cpu_gdt_table(0));
	gdt_descr.size = GDT_SIZE - 1;
	load_gdt(&gdt_descr);
}
Exemplo n.º 19
0
static void __init init_gdt(void)
{


	load_gdt(0);
}