| 1,13 → 1,78 |
|---|
| #ifdef CONFIG_FB |
| |
| #define MULTIBOOT_LOADER_MAGIC 0x2BADB002 |
| #define MBINFO_BIT_CMDLINE 2 |
| #define MBINFO_OFFSET_CMDLINE 16 |
| |
| # copy real mode VESA initialization code |
| |
| mov $vesa_init, %esi |
| mov $VESA_INIT_SEGMENT << 4, %edi |
| mov $e_vesa_init - vesa_init, %ecx |
| rep movsb |
| |
| # check for GRUB command line |
| |
| mov grub_eax, %eax |
| cmp $MULTIBOOT_LOADER_MAGIC, %eax |
| jne no_cmdline |
| |
| mov grub_ebx, %ebx |
| mov (%ebx), %eax |
| bt $MBINFO_BIT_CMDLINE, %eax |
| jnc no_cmdline |
| |
| # skip the kernel path in command line |
| |
| mov MBINFO_OFFSET_CMDLINE(%ebx), %esi |
| |
| skip_loop: |
| lodsb |
| |
| cmp $0, %al |
| je no_cmdline |
| |
| cmp $' ', %al |
| je skip_loop_done |
| |
| jmp skip_loop |
| skip_loop_done: |
| |
| mov (%esi), %al |
| cmp $0, %al |
| je no_cmdline |
| |
| # copy at most 23 characters from command line |
| |
| mov $VESA_INIT_SEGMENT << 4, %edi |
| add $default_mode - vesa_init, %edi |
| mov $23, %ecx |
| |
| cmd_loop: |
| lodsb |
| stosb |
| |
| cmp $0, %al |
| je cmd_loop_done |
| |
| loop cmd_loop |
| cmd_loop_done: |
| |
| # zero termination |
| |
| xor %eax, %eax |
| stosb |
| |
| no_cmdline: |
| |
| # jump to the real mode |
| |
| mov $VESA_INIT_SEGMENT << 4, %edi |
| jmpl *%edi |
| |
| vesa_meeting_point: |
| # returned back to protected mode |
| |
| mov %esi, KA2PA(vesa_ph_addr) |
| mov %di, KA2PA(vesa_height) |
| shr $16, %edi |