75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
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#pragma once
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#include "../main.h"
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#include "stdbool.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define GDT_SIZE_BYTES 4
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#define GDT_EXEC 0x00AF9A000000FFFFull // Base=0, Limit=max, Access=Present|Ring0|TypeUser|Exec|Readable, Flag=GranularityPage|Long
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#define GDT_DATA 0x00EF92000000FFFFull // Base=0, Limit=max, Access=Present|Ring0|TypeUser|Writable, Flag=GranularityPage|Size
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#define GDT_EXEC_RING3 0x00AFFA000000FFFFull // Base=0, Limit=max, Access=Present|Ring3|TypeUser|Exec|Readable, Flag=GranularityPage|Long
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#define GDT_DATA_RING3 0x00EFF2000000FFFFull // Base=0, Limit=max, Access=Present|Ring3|TypeUser|Writable, Flag=GranularityPage|Size
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#define GDT_EXEC_SELECTOR 0x08 // SelectorIndex=1, TableIndicator=GDT(0), Privilege=Ring0
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#define GDT_DATA_SELECTOR 0x10 // SelectorIndex=2, TableIndicator=GDT(0), Privilege=Ring0
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#define GDT_EXEC_RING3_SELECTOR 0x1B // SelectorIndex=3, TableIndicator=GDT(0), Privilege=Ring3
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#define GDT_DATA_RING3_SELECTOR 0x23 // SelectorIndex=4, TableIndicator=GDT(0), Privilege=Ring3
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#define IDT_PRESENT (1ull << 47)
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#define IDT_RING0 0
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#define IDT_RING1 (1ull << 45)
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#define IDT_RING2 (2ull << 45)
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#define IDT_RING3 (3ull << 45)
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#define IDT_TYPE_32_CALL_GATE (0x0Cull << 40)
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#define IDT_TYPE_32_INTERRUPT_GATE (0x0Eull << 40)
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#define IDT_TYPE_32_TRAP_GATE (0x0Full << 40)
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typedef struct {
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uint16_t length;
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void * base;
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} PACKED interrupt_DescriptorTableReference;
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// address of IDTR and GDTR, allocated by kMalloc() and is never freed
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extern interrupt_DescriptorTableReference *interrupt_IDTR, *interrupt_GDTR;
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// true if Init() has been called and interrupt handling is on
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extern bool interrupt_Enabled;
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// initializes interrupt handling like IDT and a dummy GDT
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void interrupt_Init();
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SYSV_ABI void interrupt_MapHandler(void *handler, int interrupt);
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// errorcode is 0 if nonexistent
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//
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// for IRQs, params are documented in assembly
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SYSV_ABI void interrupt_Handler(int vec, int errcode, uint64_t rip, int c, int d, int e);
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// defined in assembly
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SYSV_ABI void interrupt_LoadGDT(void *gdtr);
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SYSV_ABI void interrupt_LoadIDT(void *idtr);
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SYSV_ABI void interrupt_ReloadSegments();
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#define INTERRUPT_DISABLE \
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uintptr_t __interrupt_flags; \
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asm volatile("pushf\n\tcli\n\tpop %0" \
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: "=r"(__interrupt_flags) \
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: \
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: "memory")
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#define INTERRUPT_RESTORE \
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asm volatile("push %0\n\tpopf" \
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: \
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: "rm"(__interrupt_flags) \
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: "memory", "cc")
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#ifdef __cplusplus
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}
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#endif
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