minix/kernel/arch/i386/do_int86.c
Ben Gras 9647fbc94e moved type and constants for random data to include file;
added consistency check in random; added source of randomness
internal to random using timing; only retrieve random bins that are full.
2009-04-02 15:24:44 +00:00

43 lines
1.1 KiB
C

/* The kernel call implemented in this file:
* m_type: SYS_INT86
*
* The parameters for this kernel call are:
* m1_p1: INT86_REG86
*/
#include "../../system.h"
#include <minix/type.h>
#include <minix/endpoint.h>
#include <minix/portio.h>
#include <ibm/int86.h>
#include "proto.h"
struct reg86u reg86;
/*===========================================================================*
* do_int86 *
*===========================================================================*/
PUBLIC int do_int86(m_ptr)
register message *m_ptr; /* pointer to request message */
{
data_copy(who_e, (vir_bytes) m_ptr->INT86_REG86,
SYSTEM, (vir_bytes) &reg86, sizeof(reg86));
level0(int86);
/* Copy results back to the caller */
data_copy(SYSTEM, (vir_bytes) &reg86,
who_e, (vir_bytes) m_ptr->INT86_REG86, sizeof(reg86));
/* The BIOS call eats interrupts. Call get_randomness to generate some
* entropy. Normally, get_randomness is called from an interrupt handler.
* Figuring out the exact source is too complicated. CLOCK_IRQ is normally
* not very random.
*/
lock;
get_randomness(&krandom, CLOCK_IRQ);
unlock;
return(OK);
}