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#ifndef MELVIX_INTERRUPTS_H
#define MELVIX_INTERRUPTS_H
/**
* Initialize the Interrupt Descriptor Table with 256 entries
*/
void idt_install();
/**
* Add new gate (Interrupt Service Routine) to the Interrupt Descriptor Table
* @param num The index of the routine in the IDT
* @param base The base address of the ISR
* @param sel The kernel code segment (0x08)
* @param flags The IDT access byte entry (P DPL 01110)
*/
void idt_set_gate(unsigned char num, unsigned long base, unsigned short sel, unsigned char flags);
/**
* Install 32 exception ISRs into the IDT
*/
void isrs_install();
/**
* Registers that get passed into an IRQ handler
*/
struct regs {
unsigned int gs, fs, es, ds;
unsigned int edi, esi, ebp, esp, ebx, edx, ecx, eax;
unsigned int int_no, err_code;
unsigned int eip, cs, eflags, useresp, ss;
};
/**
* Initialize the Interrupt Requests by mapping the ISRs to the correct
* entries in the IDT (install the exception handlers)
*/
void irq_install();
/**
* Add a new Interrupt Request Handler
* @param irq The index of the IRQ routine
* @param handler The interrupt handler function
*/
void irq_install_handler(int irq, void (*handler)(struct regs *r));
/**
* Uninstall a handler by index
* @param irq The index of the IRQ routine that should be removed
*/
void irq_uninstall_handler(int irq);
/**
* Execute the handler of the IRQ
* @param r The ISR that should be handled
*/
void irq_handler(struct regs *r);
/**
* Check if an IRQ is installed
* @param irq The index of the IRQ routine that should be checked
* @return 1 if installed, 0 if not
*/
int irq_is_installed(int irq);
#endif
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