| | 1 | <h2>i386_set_ldt</h2> |
| | 2 | <hr> |
| | 3 | <p> |
| | 4 | <strong>Function</strong> - Set per-thread segment descriptors. |
| | 5 | <h3>SYNOPSIS</h3> |
| | 6 | <pre> |
| | 7 | <strong>kern_return_t i386_set_ldt</strong> |
| | 8 | <strong>(thread_act_t</strong> <var>target_act</var>, |
| | 9 | <strong>int</strong> <var>first_selector</var>, |
| | 10 | <strong>descriptor_list_t</strong> <var>desc_list</var><strong>);</strong> |
| | 11 | </pre> |
| | 12 | <h3>PARAMETERS</h3> |
| | 13 | <dl> |
| | 14 | <p> |
| | 15 | <dt> <var>target_act</var> |
| | 16 | <dd> |
| | 17 | [in thread send right] |
| | 18 | Thread whose segment descriptors are to be set. |
| | 19 | <p> |
| | 20 | <dt> <var>first_selector</var> |
| | 21 | <dd> |
| | 22 | [in scalar] |
| | 23 | Selector value (segment register value) corresponding to the |
| | 24 | first segment whose descriptor is to be set. |
| | 25 | <p> |
| | 26 | <dt> <var>desc_list</var> |
| | 27 | <dd> |
| | 28 | [pointer to in array of <strong>descriptor_t</strong>] |
| | 29 | Array of segment descriptors. The |
| | 30 | following forms are permitted: |
| | 31 | <ul> |
| | 32 | <p> |
| | 33 | <li> |
| | 34 | Empty descriptor. The <strong>ACC_P</strong> flag (segment present) may or may |
| | 35 | not be set. |
| | 36 | <p> |
| | 37 | <li> |
| | 38 | <strong>ACC_CALL_GATE</strong>--Converted into a system call gate. The |
| | 39 | <strong>ACC_P</strong> flag must be set. |
| | 40 | </ul> |
| | 41 | <p> |
| | 42 | All other descriptors must have both the <strong>ACC_P</strong> flag set and specify |
| | 43 | user mode access (<strong>ACC_PL_U</strong>). |
| | 44 | <ul> |
| | 45 | <p> |
| | 46 | <li> |
| | 47 | <strong>ACC_DATA</strong>. |
| | 48 | <p> |
| | 49 | <li> |
| | 50 | <strong>ACC_DATA_W</strong>. |
| | 51 | <p> |
| | 52 | <li> |
| | 53 | <strong>ACC_DATA_E</strong>. |
| | 54 | <p> |
| | 55 | <li> |
| | 56 | <strong>ACC_DATA_EW</strong>. |
| | 57 | <p> |
| | 58 | <li> |
| | 59 | <strong>ACC_CODE</strong>. |
| | 60 | <p> |
| | 61 | <li> |
| | 62 | <strong>ACC_CODE_R</strong>. |
| | 63 | <p> |
| | 64 | <li> |
| | 65 | <strong>ACC_CODE_C</strong>. |
| | 66 | <p> |
| | 67 | <li> |
| | 68 | <strong>ACC_CODE_CR</strong>. |
| | 69 | <p> |
| | 70 | <li> |
| | 71 | <strong>ACC_CALL_GATE_16</strong>. |
| | 72 | <p> |
| | 73 | <li> |
| | 74 | <strong>ACC_CALL_GATE</strong>. |
| | 75 | </ul> |
| | 76 | </dl> |
| | 77 | <h3>DESCRIPTION</h3> |
| | 78 | <p> |
| | 79 | The <strong>i386_set_ldt</strong> function allows a thread to have a |
| | 80 | private local descriptor |
| | 81 | table (LDT) which allows its local segments to map various ranges |
| | 82 | of its address |
| | 83 | space. |
| | 84 | <h3>RETURN VALUES</h3> |
| | 85 | <p> |
| | 86 | Only generic errors apply. |
| | 87 | <h3>RELATED INFORMATION</h3> |
| | 88 | <p> |
| | 89 | Functions: |
| | 90 | <a href="i386_get_ldt.html"><strong>i386_get_ldt<strong></a>. |
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