73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
#ifndef HAZEL_KERNEL_H_
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#define HAZEL_KERNEL_H_
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#include <kernel/multiboot.h>
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#include <kernel/log.h>
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#define cpu_relax asm volatile ("pause" ::)
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#define CHECK_FLAG(x, n) (x & (1<<n))
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typedef struct {
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multi_mmap_t *multi_mmap;
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uint32_t multi_mmap_size;
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uint32_t *mmap;
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uint32_t mmap_size;
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log_method_t log_method;
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uint64_t ticks;
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} kernel_ctx_t;
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#define GDT_NULL 0
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#define GDT_KERNEL_CODE 1
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#define GDT_KERNEL_DATA 2
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#define GDT_USER_CODE 3
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#define GDT_USER_DATA 4
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#define RING0 0
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#define RING3 3
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#define GDT_SEGMENT_SELECTOR(i, p) ((i << 3) | p)
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struct gdt_entry {
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uint16_t limit_low;
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uint16_t base_low;
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uint8_t base_middle;
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uint8_t access;
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uint8_t granularity;
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uint8_t base_high;
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} __attribute__((packed));
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typedef struct gdt_entry gdt_t;
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struct tss_entry {
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uint32_t prev_tss; // The previous TSS - with hardware task switching this is used
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uint32_t esp0; // The stack pointer to load when we change to kernel mode
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uint32_t ss0; // The stack segment to load when we change to kernel mode
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uint32_t esp1; // Unused...
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uint32_t ss1;
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uint32_t esp2;
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uint32_t ss2;
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uint32_t cr3;
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uint32_t eip;
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uint32_t eflags;
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uint32_t eax;
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uint32_t ecx;
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uint32_t edx;
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uint32_t ebx;
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uint32_t esp;
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uint32_t ebp;
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uint32_t esi;
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uint32_t edi;
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uint32_t es; // The value to load into ES when we change to kernel mode
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uint32_t cs; // The value to load into CS when we change to kernel mode
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uint32_t ss; // The value to load into SS when we change to kernel mode
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uint32_t ds; // The value to load into DS when we change to kernel mode
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uint32_t fs; // The value to load into FS when we change to kernel mode
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uint32_t gs; // The value to load into GS when we change to kernel mode
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uint32_t ldt; // Unused...
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uint16_t trap;
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uint16_t iomap_base;
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} __attribute__((packed));
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typedef struct tss_entry tss_t;
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#endif
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