我需要 GDT 来构建 IDT 吗？
我正在开发 Atom-32 位板（AT&T 组装），该板上还没有软件。
我是否需要构建 GDT 才能构建/使用 IDT ？
这个想法只是将 ISR 与 APIC 定时器结合使用。
/*Change the address of idt_entries table */
fill_interrupt(ISR_Nbr,(unsigned int) isr33, 0x08, 0x8E);
static void fill_interrupt(unsigned char num, unsigned int base, unsigned short sel, unsigned char flags)
{
unsigned short *Interrupt_Address;
/*address = idt_ptr.base + num * 8 byte*/
Interrupt_Address = (unsigned short *)(idt_ptr.base + num*8);
*(Interrupt_Address) = base&0xFFFF;
*(Interrupt_Address+1) = sel;
*(Interrupt_Address+1) = (flags>>8)&0xFF00;
*(Interrupt_Address+1) = (base>>16)&0xFFFF;
}
I am working on Atom-32bit board (AT&T assembly), there is no software on this board yet.
Do I need to build GDT to build/use an IDT ?
The idea is just to use an ISR with APIC timer.
/*Change the address of idt_entries table */
fill_interrupt(ISR_Nbr,(unsigned int) isr33, 0x08, 0x8E);
static void fill_interrupt(unsigned char num, unsigned int base, unsigned short sel, unsigned char flags)
{
unsigned short *Interrupt_Address;
/*address = idt_ptr.base + num * 8 byte*/
Interrupt_Address = (unsigned short *)(idt_ptr.base + num*8);
*(Interrupt_Address) = base&0xFFFF;
*(Interrupt_Address+1) = sel;
*(Interrupt_Address+1) = (flags>>8)&0xFF00;
*(Interrupt_Address+1) = (base>>16)&0xFFFF;
}
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基本上，是的。您必须有一个 GDT，以便可以有一个段来“指向”IDT 中断向量。请注意，（据我所知）您可以同时加载 IDT 和 GDT，但只有加载 GDT 后才能使用 IDT。如果你尝试这样做，最多只会犯三重错误。
Basically, yes. You must have a GDT so that you can have a segment to "point" an IDT interrupt vector at. Note, (as far as I know) you can load both the IDT and GDT at the same time, but you can't make use of the IDT until you have a GDT loaded. If you attempt to you'll, at best, get a triple fault.
已解决:)，因为有一个 BIOS，它已经构建了 GDT/IDT，所以我找到了使用 sidt 和 sgdt 指令的地址，并将我的 ISR 添加到 sidt
Resolved :), as there is a BIOS, it already built the GDT/IDT, so I found there address using sidt and sgdt instructions, and i added my ISR to sidt