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framebuffer driver and a working gdt

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cowmonk 2025-07-19 21:44:14 -07:00
parent 49bf45abc8
commit 4a304f7b63
9 changed files with 761 additions and 40 deletions
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10
kernel/include/gdt.h
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@ -4,12 +4,12 @@
#define GDT_H
typedef struct GDTEntry {
uint16_t limit;
uint16_t limit_low;
uint16_t base_low;
uint16_t base_mid;
uint8_t base_high;
uint8_t base_mid;
uint8_t access;
uint8_t granularity;
uint8_t limit_high_and_flags;
uint8_t base_high;
} __attribute__((packed)) GDTEntry;
typedef struct GDTPtr {
@ -17,7 +17,7 @@ typedef struct GDTPtr {
uint64_t base;
} __attribute__((packed)) GDTPtr;
#define GDT_NUM_ENTRIES 5 /* including null descriptor */
#define GDT_NUM_ENTRIES 5 // Incl. null descriptor
#define GDT_KERNEL_CODE 0x08
#define GDT_KERNEL_DATA 0x10
#define GDT_USER_CODE 0x18