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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 | mov (%esi), %al |
41 | mov (%esi), %al |
42 | cmp $0, %al |
42 | cmp $0, %al |
43 | je no_cmdline |
43 | je no_cmdline |
44 | 44 | ||
45 | # copy at most 23 characters from command line |
45 | # copy at most 23 characters from command line |
46 | 46 | ||
47 | mov $VESA_INIT_SEGMENT << 4, %edi |
47 | mov $VESA_INIT_SEGMENT << 4, %edi |
48 | add $default_mode - vesa_init, %edi |
48 | add $default_mode - vesa_init, %edi |
49 | mov $23, %ecx |
49 | mov $23, %ecx |
50 | 50 | ||
51 | cmd_loop: |
51 | cmd_loop: |
52 | lodsb |
52 | lodsb |
53 | stosb |
53 | stosb |
54 | 54 | ||
55 | cmp $0, %al |
55 | cmp $0, %al |
56 | je cmd_loop_done |
56 | je cmd_loop_done |
57 | 57 | ||
58 | loop cmd_loop |
58 | loop cmd_loop |
59 | cmd_loop_done: |
59 | cmd_loop_done: |
60 | 60 | ||
61 | # zero termination |
61 | # zero termination |
62 | 62 | ||
63 | xor %eax, %eax |
63 | xor %eax, %eax |
64 | stosb |
64 | stosb |
65 | 65 | ||
66 | no_cmdline: |
66 | no_cmdline: |
67 | 67 | ||
68 | # jump to the real mode |
68 | # jump to the real mode |
69 | 69 | ||
70 | mov $VESA_INIT_SEGMENT << 4, %edi |
70 | mov $VESA_INIT_SEGMENT << 4, %edi |
71 | jmpl *%edi |
71 | jmpl *%edi |
72 | 72 | ||
73 | vesa_meeting_point: |
73 | vesa_meeting_point: |
74 | # returned back to protected mode |
74 | # returned back to protected mode |
75 | 75 | ||
76 | mov %esi, KA2PA(vesa_ph_addr) |
76 | mov %esi, KA2PA(vesa_ph_addr) |
77 | mov %di, KA2PA(vesa_height) |
77 | mov %di, KA2PA(vesa_height) |
78 | shr $16, %edi |
78 | shr $16, %edi |
79 | mov %di, KA2PA(vesa_width) |
79 | mov %di, KA2PA(vesa_width) |
80 | mov %bx, KA2PA(vesa_scanline) |
80 | mov %bx, KA2PA(vesa_scanline) |
81 | shr $16, %ebx |
81 | shr $16, %ebx |
82 | mov %bx, KA2PA(vesa_bpp) |
82 | mov %bx, KA2PA(vesa_bpp) |
83 | #endif |
83 | #endif |
84 | 84 |