Vystem 0.2

shelter/lib/include/irq/idt.h

@@ -0,0 +1,41 @@
+// 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