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