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