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| author | Frans Kaashoek <[email protected]> | 2010-08-26 08:03:18 -0400 |
|---|---|---|
| committer | Frans Kaashoek <[email protected]> | 2010-08-26 08:03:18 -0400 |
| commit | d55b2fac074ac23e30c337014f40ae2156b31b60 (patch) | |
| tree | bb9885972bf8929e7957f9ea512a8befaf06b11c /bootother.S | |
| parent | d87f51c5a1c5e7a2a3ba111b1052a297f4f96fb0 (diff) | |
| parent | 789b508d538e6faf635e49f268a4f1f9e9b65f05 (diff) | |
| download | xv6-labs-d55b2fac074ac23e30c337014f40ae2156b31b60.tar.gz xv6-labs-d55b2fac074ac23e30c337014f40ae2156b31b60.tar.bz2 xv6-labs-d55b2fac074ac23e30c337014f40ae2156b31b60.zip | |
Merge commit 'origin/page' into page
Diffstat (limited to 'bootother.S')
| -rw-r--r-- | bootother.S | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/bootother.S b/bootother.S index 11d32f1..899669a 100644 --- a/bootother.S +++ b/bootother.S @@ -45,8 +45,10 @@ start: orl $CR0_PE, %eax movl %eax, %cr0 - # Jump to next instruction, but in 32-bit code segment. - # Switches processor into 32-bit mode. + # This ljmp is how you load the CS (Code Segment) register. + # SEG_ASM produces segment descriptors with the 32-bit mode + # flag set (the D flag), so addresses and word operands will + # default to 32 bits after this jump. ljmp $(SEG_KCODE<<3), $start32 .code32 # Assemble for 32-bit mode |