Subversion Repositories HelenOS-historic

Rev

Rev 95 | Rev 110 | Go to most recent revision | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 95 Rev 105
Line 37... Line 37...
37 
# Protected mode tables are statically initialised during compile
 37 
# Protected mode tables are statically initialised during compile
38 
# time. So we can just load the respective table registers and
 38 
# time. So we can just load the respective table registers and
39 
# switch to protected mode.
 39 
# switch to protected mode.
40 
#
 40 
#
41 
kernel_image_start:
 41 
kernel_image_start:
42 
	call memmap_arch_init
 - 
 
43 
	cli
 42 
	cli
- 
 
 43 
	call memmap_arch_init
44 
	xorw %ax,%ax
 44 
	xorw %ax,%ax
45 
	movw %ax,%ds
 45 
	movw %ax,%ds
46 
	lgdt gdtr
 46 
	lgdt gdtr
47 
	movl %cr0,%eax
 47 
	movl %cr0,%eax
48 
	orl $0x1,%eax
 48 
	orl $0x1,%eax
Line 60... Line 60...
60 
meeting_point:
 60 
meeting_point:
61 
.code32
 61 
.code32
62 
 
 62 
 
63 
	lidt idtr
 63 
	lidt idtr
64 
 
 64 
 
- 
 
 65 
	#
- 
 
 66 
	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
- 
 
 67 
	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.
- 
 
 68 
	#
- 
 
 69 
	movl %cr4, %ecx
- 
 
 70 
	orl $(1<<4), %ecx
65 
	call main_bsp			# never returns
 71 
	movl %ecx, %cr4				# turn PSE on
- 
 
 72
- 
 
 73 
	movl $((1<<7)|(1<<0)), %eax
- 
 
 74 
	movl %eax, page_directory		# mapping 0x00000000 => 0x00000000
- 
 
 75 
 
- 
 
 76 
	movl $(page_directory+(4096/2)), %edx
- 
 
 77 
	movl %eax, (%edx)			# mapping 0x80000000 => 0x00000000
- 
 
 78 
 
- 
 
 79 
	leal page_directory, %eax
- 
 
 80 
	movl %eax, %cr3
66
81
- 
 
 82 
	# turn on paging
- 
 
 83 
	movl %cr0, %ebx
- 
 
 84 
	orl $(1<<31), %ebx
- 
 
 85 
	movl %ebx, %cr0
- 
 
 86 
 
- 
 
 87 
	movl $_hardcoded_ktext_size, hardcoded_ktext_size
- 
 
 88 
	movl $_hardcoded_kdata_size, hardcoded_kdata_size
- 
 
 89 
	movl $_hardcoded_load_address, hardcoded_load_address
- 
 
 90 
 
- 
 
 91 
	call main_bsp			# never returns
67 
 
 92 
 
68 
	cli
 93 
	cli
69 
	hlt
 94 
	hlt
- 
 
 95 
 
- 
 
 96 
.section K_DATA_START
- 
 
 97 
 
- 
 
 98 
.align 4096
- 
 
 99 
page_directory:
- 
 
 100 
	.space 4096, 0