blob: 8ff14a95b1e4428dc2e8aa3b400f11fda190af4f (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
|
FILE OPEN
Op-Code: PXENV_FILE_OPEN (00e0h)
Input: Far pointer to a t_PXENV_FILE_OPEN parameter structure
that has been initialised by the caller.
Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be
returned in AX. The status field in the parameter
structure must be set to one of the values represented
by the PXENV_STATUS_xxx constants.
Description: Opens a file specified by a URL for reading. Multiple
files may be opened and used concurrently.
typedef struct s_PXENV_FILE_OPEN {
PXENV_STATUS Status;
UINT16 FileHandle;
SEGOFF16 FileName;
UINT32 Reserved;
} t_PXENV_FILE_OPEN;
Set before calling API service:
FileName: URL of file to be opened. Null terminated.
Reserved: Must be zero.
Returned from API service:
FileHandle: Handle for use in subsequent PXE FILE API calls.
Status: See PXENV_STATUS_xxx constants.
FILE CLOSE
Op-Code: PXENV_FILE_CLOSE (00e1h)
Input: Far pointer to a t_PXENV_FILE_CLOSE parameter structure
that has been initialised by the caller.
Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be
returned in AX. The status field in the parameter
structure must be set to one of the values represented
by the PXENV_STATUS_xxx constants.
Description: Closes a previously opened file.
typedef struct s_PXENV_FILE_CLOSE {
PXENV_STATUS Status;
UINT16 FileHandle;
} t_PXENV_FILE_CLOSE;
Set before calling API service:
FileHandle: Handle obtained when file was opened.
Returned from API service:
Status: See PXENV_STATUS_xxx constants.
FILE SELECT
Op-Code: PXENV_FILE_SELECT (00e2h)
Input: Far pointer to a t_PXENV_FILE_SELECT parameter structure
that has been initialised by the caller.
Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be
returned in AX. The status field in the parameter
structure must be set to one of the values represented
by the PXENV_STATUS_xxx constants.
Description: Check a previously opened file's readiness for I/O.
typedef struct s_PXENV_FILE_SELECT {
PXENV_STATUS Status;
UINT16 FileHandle;
UINT16 Ready;
#define RDY_READ 0x0001
} t_PXENV_FILE_SELECT;
Set before calling API service:
FileHandle: Handle obtained when file was opened.
Returned from API service:
Ready: Indication of readiness. This can be zero, or more,
of the RDY_xxx constants. Multiple values are
arithmetically or-ed together.
Status: See PXENV_STATUS_xxx constants.
FILE READ
Op-Code: PXENV_FILE_READ (00e3h)
Input: Far pointer to a t_PXENV_FILE_READ parameter structure
that has been initialised by the caller.
Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be
returned in AX. The status field in the parameter
structure must be set to one of the values represented
by the PXENV_STATUS_xxx constants.
This API function is non-blocking. PXENV_EXIT_SUCCESS
and PXENV_STATUS_SUCCESS is returned if a data block
has been transferred into the caller's buffer.
PXENV_EXIT_FAILURE and PXENV_STATUS_TFTP_OPEN is
returned if no data is available to transfer; any
other status code reflects an error.
Description: Read from a previously opened file.
typedef struct s_PXENV_FILE_READ {
PXENV_STATUS Status;
UINT16 FileHandle;
UINT16 BufferSize;
SEGOFF16 Buffer;
} t_PXENV_FILE_READ;
Set before calling API service:
FileHandle: Handle obtained when file was opened.
BufferSize: Maximum number of data bytes that can be copied into
Buffer.
Buffer: Segment:Offset address of data buffer.
Returned from API service:
BufferSize: Number of bytes written to the data buffer. End of
file if this is zero.
Status: See PXENV_STATUS_xxx constants.
GET FILE SIZE
Op-Code: PXENV_GET_FILE_SIZE (00e4h)
Input: Far pointer to a t_PXENV_GET_FILE_SIZE parameter
structure that has been initialised by the caller.
Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be
returned in AX. The status field in the parameter
structure must be set to one of the values represented
by the PXENV_STATUS_xxx constants.
Description: Determine size of a previously opened file.
typedef struct s_PXENV_GET_FILE_SIZE {
PXENV_STATUS Status;
UINT16 FileHandle;
UINT32 FileSize;
} t_PXENV_GET_FILE_SIZE;
Set before calling API service:
FileHandle: Handle obtained when file was opened.
Returned from API service:
FileSize: Size of the file in bytes.
Status: See PXENV_STATUS_xxx constants.
FILE EXEC
Op-Code: PXENV_FILE_EXEC (00e5h)
Input: Far pointer to a t_PXENV_FILE_EXEC parameter
structure that has been initialized by the caller.
Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be
returned in AX. The Status field in the parameter
structure must be set to one of the values represented
by the PXENV_STATUS_xxx constants.
Description: Execute a gPXE command.
typedef struct s_PXENV_FILE_EXEC {
PXENV_STATUS_t Status;
SEGOFF16_t Command;
} t_PXENV_FILE_EXEC;
Set before calling API service:
Command: Command to execute. Null terminated.
Returned from API service:
Status: See PXENV_STATUS_xxx constants.
FILE API CHECK
Op-Code: PXENV_FILE_API_CHECK (00e6h)
Input: Far pointer to a t_PXENV_FILE_CHECK_API parameter
structure that has been initialized by the caller.
On entry, the Magic field should contain the number
0x91d447b2 or the call will fail.
Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be
returned in AX. The Status field in the parameter
structure must be set to one of the values represented
by the PXENV_STATUS_xxx constants.
If this API is present and the Magic field contains the
proper value on entry, AX will contain PXENV_EXIT_SUCCESS,
the Status field PXENV_STATUS_SUCCESS, and the Magic field
the number 0xe9c17b20. Any other combination should be
considered a failure.
Description: Detect presence of this API.
typedef struct s_PXENV_FILE_CHECK_API {
PXENV_STATUS Status;
UINT16 Size;
UINT32 Magic;
UINT32 Provider;
UINT32 APIMask;
UINT32 Flags;
} t_PXENV_FILE_CHECK_API;
Set before calling API service:
Size: Set to sizeof(t_PXENV_FILE_CHECK_API) (20).
Magic: Set to 0x91d447b2.
Returned from API service:
Size: Set to the number of bytes filled in (20).
Magic: Set to 0xe9c17b20.
Provider: Set to 0x45585067 ("gPXE"). Another implementation of this
API can use another value, e.g. to indicate a different
command set supported by FILE EXEC.
APIMask: Bitmask of supported API functions (one bit for each function
in the range 00e0h to 00ffh).
Flags: Set to zero, reserved for future use.
FILE EXIT HOOK
Op-Code: PXENV_FILE_EXIT_HOOK (00e7h)
Input: Far pointer to a t_PXENV_FILE_EXIT_HOOK parameter
structure that has been initialized by the caller.
Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be
returned in AX. The Status field in the parameter
structure must be set to one of the values represented
by the PXENV_STATUS_xxx constants.
Description: Modify the exit path to jump to the specified code.
Only valid for pxeprefix-based builds.
typedef struct s_PXENV_FILE_EXIT_HOOK {
PXENV_STATUS_t Status;
SEGOFF16_t Hook;
} t_PXENV_FILE_EXIT_HOOK;
Set before calling API service:
Hook: The SEG16:OFF16 of the code to jump to.
Returned from API service:
Status: See PXENV_STATUS_xxx constants.
|
