diff options
| author | Robert Morris <[email protected]> | 2016-08-10 10:51:14 -0400 |
|---|---|---|
| committer | Robert Morris <[email protected]> | 2016-08-10 10:51:14 -0400 |
| commit | 858475e4dfabb61dc72ab5b4f105e2a0a636e7e8 (patch) | |
| tree | 16f960cc7005744d73e50bb55d2eecb8f080dafa /mmu.h | |
| parent | 0a4a4230a32696ef7f1f6272ca24520826195b7f (diff) | |
| download | xv6-labs-858475e4dfabb61dc72ab5b4f105e2a0a636e7e8.tar.gz xv6-labs-858475e4dfabb61dc72ab5b4f105e2a0a636e7e8.tar.bz2 xv6-labs-858475e4dfabb61dc72ab5b4f105e2a0a636e7e8.zip | |
tiny clarifications to some gdt code.
Diffstat (limited to 'mmu.h')
| -rw-r--r-- | mmu.h | 4 |
1 files changed, 4 insertions, 0 deletions
@@ -39,6 +39,7 @@ #define CR4_PSE 0x00000010 // Page size extension +// various segment selectors. #define SEG_KCODE 1 // kernel code #define SEG_KDATA 2 // kernel data+stack #define SEG_KCPU 3 // kernel per-cpu data @@ -46,6 +47,9 @@ #define SEG_UDATA 5 // user data+stack #define SEG_TSS 6 // this process's task state +// cpu->gdt[NSEGS] holds the above segments. +#define NSEGS 7 + //PAGEBREAK! #ifndef __ASSEMBLER__ // Segment Descriptor |