forked from lolo859/vystem
42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
// SPDX-License-Identifier: MPL-2.0
|
|
#ifndef SH_LIB_IDT_H
|
|
#define SH_LIB_IDT_H
|
|
#include "std/status.h"
|
|
#include "std/type.h"
|
|
// IDT entry structure
|
|
#pragma pack(1)
|
|
typedef struct {
|
|
sh_uint16 offset_low;
|
|
sh_uint16 selector;
|
|
sh_uint8 ist;
|
|
sh_uint8 type_attr;
|
|
sh_uint16 offset_mid;
|
|
sh_uint32 offset_high;
|
|
sh_uint32 reserved;
|
|
} sh_idt_IDT_ENTRY;
|
|
#pragma pack()
|
|
// IDTR structure
|
|
#pragma pack(1)
|
|
typedef struct {
|
|
sh_uint16 limit;
|
|
sh_uint64 base;
|
|
} sh_idt_IDTR;
|
|
#pragma pack()
|
|
// Full IDT structure
|
|
#pragma pack(1)
|
|
typedef struct {
|
|
sh_idt_IDT_ENTRY entries[256];
|
|
} sh_idt_IDT;
|
|
#pragma pack()
|
|
// Generate type_attr byte
|
|
inline sh_uint8 sh_idt_fill_type_attr_byte(sh_bool present,sh_uint8 dpl,sh_uint8 type) {
|
|
return ((present?1:0)<<7)|((dpl&0x3)<<5)|(type&0x1F);
|
|
}
|
|
// Fill an IDT entry, expect type_attr as sh_idt_fill_type_attr_byte would return it
|
|
sh_idt_IDT_ENTRY sh_idt_fill_idt_entry(sh_uint64 offset,sh_uint16 selector,sh_uint8 ist,sh_uint8 type_attr);
|
|
// Fill the IDT
|
|
SH_STATUS sh_idt_fill_idt(sh_idt_IDT *idt);
|
|
// Fill and load IDTR
|
|
SH_STATUS sh_idt_load_idtr(sh_idt_IDT *idt);
|
|
#endif
|