Last change
on this file since 4 was 4, checked in by Mattia Monga, 14 years ago |
Importazione sorgenti libro
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File size:
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1 | /* The kernel call implemented in this file:
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2 | * m_type: SYS_INT86
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3 | *
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4 | * The parameters for this kernel call are:
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5 | * m1_p1: INT86_REG86
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6 | */
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7 |
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8 | #include "../system.h"
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9 | #include <minix/type.h>
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10 | #include <ibm/int86.h>
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11 |
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12 | struct reg86u reg86;
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13 |
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14 | /*===========================================================================*
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15 | * do_int86 *
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16 | *===========================================================================*/
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17 | PUBLIC int do_int86(m_ptr)
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18 | register message *m_ptr; /* pointer to request message */
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19 | {
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20 | int caller;
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21 | vir_bytes caller_vir;
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22 | phys_bytes caller_phys, kernel_phys;
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23 |
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24 | caller = (int) m_ptr->m_source;
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25 | caller_vir = (vir_bytes) m_ptr->INT86_REG86;
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26 | caller_phys = umap_local(proc_addr(caller), D, caller_vir, sizeof(reg86));
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27 | if (0 == caller_phys) return(EFAULT);
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28 | kernel_phys = vir2phys(®86);
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29 | phys_copy(caller_phys, kernel_phys, (phys_bytes) sizeof(reg86));
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30 |
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31 | level0(int86);
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32 |
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33 | /* Copy results back to the caller */
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34 | phys_copy(kernel_phys, caller_phys, (phys_bytes) sizeof(reg86));
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35 |
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36 | /* The BIOS call eats interrupts. Call get_randomness to generate some
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37 | * entropy. Normally, get_randomness is called from an interrupt handler.
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38 | * Figuring out the exact source is too complicated. CLOCK_IRQ is normally
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39 | * not very random.
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40 | */
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41 | lock(0, "do_int86");
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42 | get_randomness(CLOCK_IRQ);
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43 | unlock(0);
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44 |
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45 | return(OK);
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46 | }
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