Subversion Repositories HelenOS

Rev

Rev 4346 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
4127 decky 1 
#ifdef CONFIG_FB
4128 decky 2 
 
3 
#define MULTIBOOT_LOADER_MAGIC  0x2BADB002
4 
#define MBINFO_BIT_CMDLINE      2
5 
#define MBINFO_OFFSET_CMDLINE   16
6 
 
7 
	# copy real mode VESA initialization code
8 
 
4127 decky 9 
	mov $vesa_init, %esi
10 
	mov $VESA_INIT_SEGMENT << 4, %edi
11 
	mov $e_vesa_init - vesa_init, %ecx
12 
	rep movsb
13 
 
4128 decky 14 
	# check for GRUB command line
15 
 
16 
	mov grub_eax, %eax
17 
	cmp $MULTIBOOT_LOADER_MAGIC, %eax
18 
	jne no_cmdline
19 
 
20 
	mov grub_ebx, %ebx
21 
	mov (%ebx), %eax
22 
	bt $MBINFO_BIT_CMDLINE, %eax
23 
	jnc no_cmdline
24 
 
25 
	# skip the kernel path in command line
26 
 
27 
	mov MBINFO_OFFSET_CMDLINE(%ebx), %esi
28 
 
29 
	skip_loop:
30 
		lodsb
31 
 
32 
		cmp $0, %al
33 
		je no_cmdline
34 
 
35 
		cmp $' ', %al
36 
		je skip_loop_done
37 
 
38 
		jmp skip_loop
39 
	skip_loop_done:
40 
 
4347 svoboda 41 
	space_loop:
42 
		mov (%esi), %al
43 
 
44 
		cmp $0, %al
45 
		je no_cmdline
46 
 
47 
		cmp $' ', %al
48 
		jne space_loop_done
49 
 
50 
		inc %esi
51 
		jmp space_loop
52 
	space_loop_done:
4128 decky 53 
 
54 
	# copy at most 23 characters from command line
55 
 
4127 decky 56 
	mov $VESA_INIT_SEGMENT << 4, %edi
4128 decky 57 
	add $default_mode - vesa_init, %edi
58 
	mov $23, %ecx
59 
 
60 
	cmd_loop:
61 
		lodsb
62 
		stosb
63 
 
64 
		cmp $0, %al
65 
		je cmd_loop_done
66 
 
67 
		loop cmd_loop
68 
	cmd_loop_done:
69 
 
70 
	# zero termination
71 
 
72 
	xor %eax, %eax
73 
	stosb
74 
 
75 
	no_cmdline:
76 
 
77 
	# jump to the real mode
78 
 
79 
	mov $VESA_INIT_SEGMENT << 4, %edi
4127 decky 80 
	jmpl *%edi
81 
 
82 
	vesa_meeting_point:
4128 decky 83 
		# returned back to protected mode
84 
 
4347 svoboda 85 
		mov %ax, KA2PA(vesa_scanline)
86 
		shr $16, %eax
87 
		mov %ax, KA2PA(vesa_bpp)
88 
 
89 
		mov %bx, KA2PA(vesa_height)
4127 decky 90 
		shr $16, %ebx
4347 svoboda 91 
		mov %bx, KA2PA(vesa_width)
92 
 
93 
		mov %dl, KA2PA(vesa_green_pos)
94 
		shr $8, %edx
95 
		mov %dl, KA2PA(vesa_green_mask)
96 
		shr $8, %edx
97 
		mov %dl, KA2PA(vesa_red_pos)
98 
		shr $8, %edx
99 
		mov %dl, KA2PA(vesa_red_mask)
100 
 
101 
		mov %esi, %edx
102 
		mov %dl, KA2PA(vesa_blue_pos)
103 
		shr $8, %edx
104 
		mov %dl, KA2PA(vesa_blue_mask)
105 
 
106 
		mov %edi, KA2PA(vesa_ph_addr)
4127 decky 107 
#endif