42 lines
876 B
C++
42 lines
876 B
C++
#include "idt.h"
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using namespace Genode;
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extern uint64_t _isr_array[];
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class Descriptor
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{
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private:
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uint16_t _limit;
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uint64_t _base;
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public:
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Descriptor(uint16_t l, uint64_t b) : _limit(l), _base (b) {};
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} __attribute__((packed));
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__attribute__((aligned(8))) Idt::gate Idt::_table[SIZE_IDT];
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void Idt::setup()
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{
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uint64_t *isrs = _isr_array;
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for (unsigned vec = 0; vec < SIZE_IDT; vec++, isrs++) {
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_table[vec].offset_15_00 = *isrs & 0xffff;
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_table[vec].segment_sel = 8;
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_table[vec].flags = 0x8e00;
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_table[vec].offset_31_16 = (*isrs >> 16) & 0xffff;
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_table[vec].offset_63_32 = (*isrs >> 32) & 0xffff;
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}
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/* Set DPL of syscall entry to 3 */
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_table[SYSCALL_VEC].flags = _table[SYSCALL_VEC].flags | 0x6000;
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}
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void Idt::load()
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{
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asm volatile ("lidt %0" : : "m" (Descriptor (sizeof (_table) - 1,
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reinterpret_cast<uint64_t>(_table))));
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}
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