| 1 | #ifdef CONFIG_FB
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| 2 |
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| 3 | #define MBINFO_BIT_CMDLINE 2
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| 4 | #define MBINFO_OFFSET_CMDLINE 16
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| 5 |
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| 6 | /* Copy real mode VESA initialization code */
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| 7 |
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| 8 | pm_status $status_vesa_copy
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| 9 |
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| 10 | mov $vesa_init, %esi
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| 11 | mov $VESA_INIT_SEGMENT << 4, %edi
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| 12 | mov $e_vesa_init - vesa_init, %ecx
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| 13 | rep movsb
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| 14 |
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| 15 | /* Check for multiboot command line */
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| 16 |
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| 17 | pm_status $status_multiboot_cmdline
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| 18 |
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| 19 | mov multiboot_eax, %eax
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| 20 | cmp $MULTIBOOT_LOADER_MAGIC, %eax
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| 21 | jne no_cmdline
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| 22 |
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| 23 | mov multiboot_ebx, %ebx
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| 24 | mov (%ebx), %eax
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| 25 | bt $MBINFO_BIT_CMDLINE, %eax
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| 26 | jnc no_cmdline
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| 27 |
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| 28 | /* Skip the kernel path in command line */
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| 29 |
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| 30 | mov MBINFO_OFFSET_CMDLINE(%ebx), %esi
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| 31 |
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| 32 | skip_loop:
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| 33 | lodsb
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| 34 |
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| 35 | cmp $0, %al
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| 36 | je no_cmdline
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| 37 |
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| 38 | cmp $' ', %al
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| 39 | je skip_loop_done
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| 40 |
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| 41 | jmp skip_loop
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| 42 | skip_loop_done:
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| 43 |
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| 44 | space_loop:
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| 45 | mov (%esi), %al
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| 46 |
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| 47 | cmp $0, %al
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| 48 | je no_cmdline
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| 49 |
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| 50 | cmp $' ', %al
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| 51 | jne space_loop_done
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| 52 |
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| 53 | inc %esi
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| 54 | jmp space_loop
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| 55 | space_loop_done:
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| 56 |
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| 57 | /* Copy at most 23 characters from command line */
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| 58 |
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| 59 | mov $VESA_INIT_SEGMENT << 4, %edi
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| 60 | add $default_mode - vesa_init, %edi
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| 61 | mov $23, %ecx
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| 62 |
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| 63 | cmd_loop:
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| 64 | lodsb
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| 65 | stosb
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| 66 |
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| 67 | cmp $0, %al
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| 68 | je cmd_loop_done
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| 69 |
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| 70 | loop cmd_loop
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| 71 | cmd_loop_done:
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| 72 |
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| 73 | /* Zero termination */
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| 74 |
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| 75 | xor %eax, %eax
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| 76 | stosb
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| 77 |
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| 78 | no_cmdline:
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| 79 |
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| 80 | /* Jump to the real mode */
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| 81 |
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| 82 | pm_status $status_vesa_real
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| 83 |
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| 84 | mov $VESA_INIT_SEGMENT << 4, %edi
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| 85 | jmpl *%edi
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| 86 |
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| 87 | vesa_meeting_point:
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| 88 | /* Returned back to protected mode */
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| 89 |
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| 90 | /*
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| 91 | * Initialize Global Descriptor Table and
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| 92 | * Interrupt Descriptor Table registers
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| 93 | */
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| 94 | lgdtl bootstrap_gdtr
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| 95 | lidtl bootstrap_idtr
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| 96 |
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| 97 | movzx %ax, %ecx
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| 98 | mov %ecx, KA2PA(bfb_scanline)
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| 99 |
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| 100 | shr $16, %eax
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| 101 | mov %ax, KA2PA(bfb_bpp)
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| 102 |
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| 103 | movzx %bx, %ecx
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| 104 | mov %ecx, KA2PA(bfb_height)
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| 105 |
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| 106 | shr $16, %ebx
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| 107 | mov %ebx, KA2PA(bfb_width)
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| 108 |
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| 109 | mov %dl, KA2PA(bfb_green_pos)
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| 110 |
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| 111 | shr $8, %edx
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| 112 | mov %dl, KA2PA(bfb_green_size)
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| 113 |
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| 114 | shr $8, %edx
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| 115 | mov %dl, KA2PA(bfb_red_pos)
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| 116 |
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| 117 | shr $8, %edx
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| 118 | mov %dl, KA2PA(bfb_red_size)
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| 119 |
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| 120 | mov %esi, %edx
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| 121 | mov %dl, KA2PA(bfb_blue_pos)
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| 122 |
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| 123 | shr $8, %edx
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| 124 | mov %dl, KA2PA(bfb_blue_size)
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| 125 |
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| 126 | mov %edi, KA2PA(bfb_addr)
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| 127 | #endif
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