diff options
Diffstat (limited to 'kernel/boot/gdt.c')
| -rw-r--r-- | kernel/boot/gdt.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/kernel/boot/gdt.c b/kernel/boot/gdt.c index 34bbfe3..4644b3d 100644 --- a/kernel/boot/gdt.c +++ b/kernel/boot/gdt.c @@ -18,6 +18,8 @@ #include <stdint.h> +#include <kernel/io.h> + #include <boot/gdt.h> GDT_entry GDT[] = { @@ -28,7 +30,22 @@ GDT_entry GDT[] = { GDT_ENTRY(0, 0xfffff, KERNEL_CODE_SEGMENT_ACCESS_FLAGS, FLAGS), /* Kernel Mode Data Segment */ - GDT_ENTRY(0, 0xfffff, KERNEL_DATA_SEGMENT_ACCESS_FLAGS, FLAGS) + GDT_ENTRY(0, 0xfffff, KERNEL_DATA_SEGMENT_ACCESS_FLAGS, FLAGS), + + /* User Mode Code Segment */ + GDT_ENTRY(0, 0xfffff, USER_CODE_SEGMENT_ACCESS_FLAGS, FLAGS), + + /* User Mode Data Segment */ + GDT_ENTRY(0, 0xfffff, USER_DATA_SEGMENT_ACCESS_FLAGS, FLAGS) + + /* TODO: TSS? */ + /* TODO: LDT? */ }; -GDT_descriptor g_GDT_descriptor = { sizeof(GDT) - 1, GDT }; +GDT_descriptor g_GDT_descriptor = { sizeof(GDT_entry) * 5 - 1, &GDT[0] }; + +void +GDT_load(void) +{ + _GDT_flush(&g_GDT_descriptor); +} |