50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_INT86
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*
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* The parameters for this system call are:
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* m1_p1: INT86_REG86
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*
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* Changes:
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* Jul 30, 2005 created to support BIOS driver (Philip Homburg)
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*/
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#include "../system.h"
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#include <minix/type.h>
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#include <ibm/int86.h>
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struct reg86u reg86;
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/*===========================================================================*
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* do_int86 *
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*===========================================================================*/
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PUBLIC int do_int86(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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int caller;
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vir_bytes caller_vir;
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phys_bytes caller_phys, kernel_phys;
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caller = (int) m_ptr->m_source;
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caller_vir = (vir_bytes) m_ptr->INT86_REG86;
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caller_phys = umap_local(proc_addr(caller), D, caller_vir, sizeof(reg86));
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if (0 == caller_phys) return(EFAULT);
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kernel_phys = vir2phys(®86);
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phys_copy(caller_phys, kernel_phys, (phys_bytes) sizeof(reg86));
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level0(int86);
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/* Copy results back to the caller */
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phys_copy(kernel_phys, caller_phys, (phys_bytes) sizeof(reg86));
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/* The BIOS call eats interrupts. Call get_randomness to generate some
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* entropy. Normally, get_randomness is called from an interrupt handler.
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* Figuring out the exact source is too complicated. CLOCK_IRQ is normally
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* not very random.
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*/
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lock(0, "do_int86");
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get_randomness(CLOCK_IRQ);
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unlock(0);
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return(OK);
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}
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