common.h

#ifndef STD_COMMON_H
#define STD_COMMON_H

#include "std_base.h"
#include <stdint.h>

__BEGIN_DECLS

#define kernel_begin_critical() __asm__("cli");
#define kernel_end_critical() __asm__("sti");

//if the memory layout of this changes, kernel/util/interrupts/interrupt.s must be changed as well
//to correct offsets
typedef struct registers {
    unsigned int gs, fs, es, ds;                //segment registers 
    unsigned int edi, esi, ebp, esp, ebx, edx, ecx, eax;    //pushed by pusha
    unsigned int int_no, err_code;              //interrupt number and error code
    unsigned int eip, cs, eflags, useresp, ss;      //pushed by the processor automatically
} registers_t;

//write byte to port
STDAPI void outb(uint16_t port, uint8_t val);
//write word to port
STDAPI void outw(uint16_t port, uint16_t val);
//write 32bits to port
STDAPI void outl(uint16_t port, uint32_t val);

//read byte from port
STDAPI uint8_t inb(uint16_t port);
//read word from port
STDAPI uint16_t inw(uint16_t port);
//read 32bits from port
STDAPI uint32_t inl(uint16_t port);

//force wait for i/o operation to complete
//this should only be used when there's nothing like
//a status register or IRQ to tell you info has been received
STDAPI void io_wait(void);

//returns if interrupts are on
STDAPI char interrupts_enabled(void);

//requests CPUID
STDAPI void cpuid(int code, uint32_t* a, uint32_t* d);

__END_DECLS

#endif // STD_COMMON_H