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| author | fishsoupisgood <github@madingley.org> | 2019-04-29 01:17:54 +0100 |
|---|---|---|
| committer | fishsoupisgood <github@madingley.org> | 2019-05-27 03:43:43 +0100 |
| commit | 3f2546b2ef55b661fd8dd69682b38992225e86f6 (patch) | |
| tree | 65ca85f13617aee1dce474596800950f266a456c /roms/openbios/arch/x86/segment.h | |
| download | qemu-master.tar.gz qemu-master.tar.bz2 qemu-master.zip | |
Diffstat (limited to 'roms/openbios/arch/x86/segment.h')
| -rw-r--r-- | roms/openbios/arch/x86/segment.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/roms/openbios/arch/x86/segment.h b/roms/openbios/arch/x86/segment.h new file mode 100644 index 00000000..0371a80a --- /dev/null +++ b/roms/openbios/arch/x86/segment.h @@ -0,0 +1,30 @@ + +/* Segment indexes. Must match the gdt definition in segment.c. */ +enum { + NULL_SEG, + FLAT_CODE, + FLAT_DATA, + RELOC_CODE, + RELOC_DATA, + NUM_SEG, +}; + +/* Values for segment selector register */ +#define FLAT_CS (FLAT_CODE << 3) +#define FLAT_DS (FLAT_DATA << 3) +#define RELOC_CS (RELOC_CODE << 3) +#define RELOC_DS (RELOC_DATA << 3) + +/* i386 segment descriptor */ +struct segment_desc { + unsigned short limit_0; + unsigned short base_0; + unsigned char base_16; + unsigned char types; + unsigned char flags; + unsigned char base_24; +}; + +extern struct segment_desc gdt[NUM_SEG]; + +#define GDT_LIMIT ((NUM_SEG << 3) - 1) |