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1 | #ifdef CONFIG_FB |
1 | #ifdef CONFIG_FB |
2 | 2 | ||
3 | #define MULTIBOOT_LOADER_MAGIC 0x2BADB002 |
3 | #define MULTIBOOT_LOADER_MAGIC 0x2BADB002 |
4 | #define MBINFO_BIT_CMDLINE 2 |
4 | #define MBINFO_BIT_CMDLINE 2 |
5 | #define MBINFO_OFFSET_CMDLINE 16 |
5 | #define MBINFO_OFFSET_CMDLINE 16 |
6 | 6 | ||
7 | # copy real mode VESA initialization code |
7 | # copy real mode VESA initialization code |
8 | 8 | ||
9 | mov $vesa_init, %esi |
9 | mov $vesa_init, %esi |
10 | mov $VESA_INIT_SEGMENT << 4, %edi |
10 | mov $VESA_INIT_SEGMENT << 4, %edi |
11 | mov $e_vesa_init - vesa_init, %ecx |
11 | mov $e_vesa_init - vesa_init, %ecx |
12 | rep movsb |
12 | rep movsb |
13 | 13 | ||
14 | # check for GRUB command line |
14 | # check for GRUB command line |
15 | 15 | ||
16 | mov grub_eax, %eax |
16 | mov grub_eax, %eax |
17 | cmp $MULTIBOOT_LOADER_MAGIC, %eax |
17 | cmp $MULTIBOOT_LOADER_MAGIC, %eax |
18 | jne no_cmdline |
18 | jne no_cmdline |
19 | 19 | ||
20 | mov grub_ebx, %ebx |
20 | mov grub_ebx, %ebx |
21 | mov (%ebx), %eax |
21 | mov (%ebx), %eax |
22 | bt $MBINFO_BIT_CMDLINE, %eax |
22 | bt $MBINFO_BIT_CMDLINE, %eax |
23 | jnc no_cmdline |
23 | jnc no_cmdline |
24 | 24 | ||
25 | # skip the kernel path in command line |
25 | # skip the kernel path in command line |
26 | 26 | ||
27 | mov MBINFO_OFFSET_CMDLINE(%ebx), %esi |
27 | mov MBINFO_OFFSET_CMDLINE(%ebx), %esi |
28 | 28 | ||
29 | skip_loop: |
29 | skip_loop: |
30 | lodsb |
30 | lodsb |
31 | 31 | ||
32 | cmp $0, %al |
32 | cmp $0, %al |
33 | je no_cmdline |
33 | je no_cmdline |
34 | 34 | ||
35 | cmp $' ', %al |
35 | cmp $' ', %al |
36 | je skip_loop_done |
36 | je skip_loop_done |
37 | 37 | ||
38 | jmp skip_loop |
38 | jmp skip_loop |
39 | skip_loop_done: |
39 | skip_loop_done: |
40 | 40 | ||
41 | space_loop: |
41 | space_loop: |
42 | mov (%esi), %al |
42 | mov (%esi), %al |
43 | 43 | ||
44 | cmp $0, %al |
44 | cmp $0, %al |
45 | je no_cmdline |
45 | je no_cmdline |
46 | 46 | ||
47 | cmp $' ', %al |
47 | cmp $' ', %al |
48 | jne space_loop_done |
48 | jne space_loop_done |
49 | 49 | ||
50 | inc %esi |
50 | inc %esi |
51 | jmp space_loop |
51 | jmp space_loop |
52 | space_loop_done: |
52 | space_loop_done: |
53 | 53 | ||
54 | # copy at most 23 characters from command line |
54 | # copy at most 23 characters from command line |
55 | 55 | ||
56 | mov $VESA_INIT_SEGMENT << 4, %edi |
56 | mov $VESA_INIT_SEGMENT << 4, %edi |
57 | add $default_mode - vesa_init, %edi |
57 | add $default_mode - vesa_init, %edi |
58 | mov $23, %ecx |
58 | mov $23, %ecx |
59 | 59 | ||
60 | cmd_loop: |
60 | cmd_loop: |
61 | lodsb |
61 | lodsb |
62 | stosb |
62 | stosb |
63 | 63 | ||
64 | cmp $0, %al |
64 | cmp $0, %al |
65 | je cmd_loop_done |
65 | je cmd_loop_done |
66 | 66 | ||
67 | loop cmd_loop |
67 | loop cmd_loop |
68 | cmd_loop_done: |
68 | cmd_loop_done: |
69 | 69 | ||
70 | # zero termination |
70 | # zero termination |
71 | 71 | ||
72 | xor %eax, %eax |
72 | xor %eax, %eax |
73 | stosb |
73 | stosb |
74 | 74 | ||
75 | no_cmdline: |
75 | no_cmdline: |
76 | 76 | ||
77 | # jump to the real mode |
77 | # jump to the real mode |
78 | 78 | ||
79 | mov $VESA_INIT_SEGMENT << 4, %edi |
79 | mov $VESA_INIT_SEGMENT << 4, %edi |
80 | jmpl *%edi |
80 | jmpl *%edi |
81 | 81 | ||
82 | vesa_meeting_point: |
82 | vesa_meeting_point: |
83 | # returned back to protected mode |
83 | # returned back to protected mode |
84 | 84 | ||
85 | mov %ax, KA2PA(vesa_scanline) |
85 | mov %ax, KA2PA(vesa_scanline) |
86 | shr $16, %eax |
86 | shr $16, %eax |
87 | mov %ax, KA2PA(vesa_bpp) |
87 | mov %ax, KA2PA(vesa_bpp) |
88 | 88 | ||
89 | mov %bx, KA2PA(vesa_height) |
89 | mov %bx, KA2PA(vesa_height) |
90 | shr $16, %ebx |
90 | shr $16, %ebx |
91 | mov %bx, KA2PA(vesa_width) |
91 | mov %bx, KA2PA(vesa_width) |
92 | 92 | ||
93 | mov %dl, KA2PA(vesa_green_pos) |
93 | mov %dl, KA2PA(vesa_green_pos) |
94 | shr $8, %edx |
94 | shr $8, %edx |
95 | mov %dl, KA2PA(vesa_green_mask) |
95 | mov %dl, KA2PA(vesa_green_mask) |
96 | shr $8, %edx |
96 | shr $8, %edx |
97 | mov %dl, KA2PA(vesa_red_pos) |
97 | mov %dl, KA2PA(vesa_red_pos) |
98 | shr $8, %edx |
98 | shr $8, %edx |
99 | mov %dl, KA2PA(vesa_red_mask) |
99 | mov %dl, KA2PA(vesa_red_mask) |
100 | 100 | ||
101 | mov %esi, %edx |
101 | mov %esi, %edx |
102 | mov %dl, KA2PA(vesa_blue_pos) |
102 | mov %dl, KA2PA(vesa_blue_pos) |
103 | shr $8, %edx |
103 | shr $8, %edx |
104 | mov %dl, KA2PA(vesa_blue_mask) |
104 | mov %dl, KA2PA(vesa_blue_mask) |
105 | 105 | ||
106 | mov %edi, KA2PA(vesa_ph_addr) |
106 | mov %edi, KA2PA(vesa_ph_addr) |
107 | #endif |
107 | #endif |
108 | 108 |