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| author | Joursoir <chat@joursoir.net> | 2021-08-26 18:33:54 +0000 |
|---|---|---|
| committer | Joursoir <chat@joursoir.net> | 2021-08-26 18:33:54 +0000 |
| commit | 3009fc4d4ea33d3d6e29d5b1877c6d21c3db3c47 (patch) | |
| tree | b60b08f2d12d612de99f46ad828d43538cb06b0c | |
| parent | 47be053721ffd099f126e845809af35b0f6b8387 (diff) | |
| download | mfsos-3009fc4d4ea33d3d6e29d5b1877c6d21c3db3c47.tar.gz mfsos-3009fc4d4ea33d3d6e29d5b1877c6d21c3db3c47.tar.bz2 mfsos-3009fc4d4ea33d3d6e29d5b1877c6d21c3db3c47.zip | |
x86/boot/bootsect: load the kernel at a new address
| -rw-r--r-- | arch/x86/boot/bootsect.s | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/boot/bootsect.s b/arch/x86/boot/bootsect.s index 5932445..3410131 100644 --- a/arch/x86/boot/bootsect.s +++ b/arch/x86/boot/bootsect.s @@ -8,6 +8,7 @@ .set CODESEG, gdt_code - gdt_start .set DATASEG, gdt_data - gdt_start +.set SYSSEG, 0x1000 # Historical load address .set MAGIC, 0xAA55 .section .text.bootentry # Code that will start executing at @@ -38,7 +39,7 @@ load_kernel: # Load our kernel mov $0x02, %cl # Select sector 2 (next after the # boot sector) [has a base of 1] mov $0x01, %al # Read 1 sectors - mov $0x9000, %bx # Load sectors to ES:BS (0x9000) + mov $SYSSEG, %bx # Load sectors to ES:BX (0:$SYSSEG) int $0x13 # Start reading from drive jc disk_error # If carry flag set, bios failed to read |