3 * \brief Virtual console interface.
6 * (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,
7 * Alexander Warg <warg@os.inf.tu-dresden.de>,
8 * Torsten Frenzel <frenzel@os.inf.tu-dresden.de>
9 * economic rights: Technische Universität Dresden (Germany)
11 * This file is part of TUD:OS and distributed under the terms of the
12 * GNU General Public License 2.
13 * Please see the COPYING-GPL-2 file for details.
15 * As a special exception, you may use this file as part of a free software
16 * library without restriction. Specifically, if other files instantiate
17 * templates or use macros or inline functions from this file, or you compile
18 * this file and link it with other files to produce an executable, this
19 * file does not by itself cause the resulting executable to be covered by
20 * the GNU General Public License. This exception does not however
21 * invalidate any other reasons why the executable file might be covered by
22 * the GNU General Public License.
26 #include <l4/sys/ipc.h>
29 * \defgroup l4_vcon_api Virtual Console
30 * \ingroup l4_kernel_object_api
31 * \brief Virtual console for simple character based input and output.
33 * <c>\#include <l4/sys/vcon.h></c>
35 * Interrupt for read events are provided by the virtual key interrupt.
39 * \brief Send data to virtual console.
40 * \ingroup l4_vcon_api
42 * \param vcon Vcon object.
43 * \param buf Pointer to data buffer.
44 * \param size Size of buffer in bytes.
46 * \return Syscall return tag
48 * \note Size must not exceed L4_VCON_WRITE_SIZE.
51 l4_vcon_send(l4_cap_idx_t vcon, char const *buf, int size) L4_NOTHROW;
57 l4_vcon_send_u(l4_cap_idx_t vcon, char const *buf, int size, l4_utcb_t *utcb) L4_NOTHROW;
61 * \brief Write data to virtual console.
62 * \ingroup l4_vcon_api
64 * \param vcon Vcon object.
65 * \param buf Pointer to data buffer.
66 * \param size Size of buffer in bytes.
68 * \return Number of bytes written to the virtual console.
71 l4_vcon_write(l4_cap_idx_t vcon, char const *buf, int size) L4_NOTHROW;
77 l4_vcon_write_u(l4_cap_idx_t vcon, char const *buf, int size, l4_utcb_t *utcb) L4_NOTHROW;
80 * \brief Constants for l4_vcon_write.
81 * \ingroup l4_vcon_api
83 enum L4_vcon_write_consts
85 /** Maximum size that can be written with one l4_vcon_write call. */
86 L4_VCON_WRITE_SIZE = (L4_UTCB_GENERIC_DATA_SIZE - 2) * sizeof(l4_umword_t),
90 * \brief Read data from virtual console.
91 * \ingroup l4_vcon_api
93 * \param vcon Vcon object.
94 * \param buf Pointer to data buffer.
95 * \param size Size of buffer in bytes.
97 * \return Negative error code on error,
98 * > size if more to read, size bytes are in the buffer,
102 l4_vcon_read(l4_cap_idx_t vcon, char *buf, int size) L4_NOTHROW;
108 l4_vcon_read_u(l4_cap_idx_t vcon, char *buf, int size, l4_utcb_t *utcb) L4_NOTHROW;
112 * \brief Vcon attribute structure.
113 * \ingroup l4_vcon_api
115 typedef struct l4_vcon_attr_t
117 l4_umword_t i_flags; ///< input flags
118 l4_umword_t o_flags; ///< output flags
119 l4_umword_t l_flags; ///< local flags
123 * \brief Input flags.
124 * \ingroup l4_vcon_api
128 L4_VCON_INLCR = 000100, ///< Translate NL to CR
129 L4_VCON_IGNCR = 000200, ///< Ignore CR
130 L4_VCON_ICRNL = 000400, ///< Translate CR to NL if L4_VCON_IGNCR is not set
134 * \brief Output flags.
135 * \ingroup l4_vcon_api
139 L4_VCON_ONLCR = 000004, ///< Translate NL to CR-NL
140 L4_VCON_OCRNL = 000010, ///< Translate CR to NL
141 L4_VCON_ONLRET = 000040, ///< Do not ouput CR
145 * \brief Local flags.
146 * \ingroup l4_vcon_api
150 L4_VCON_ICANON = 000002, ///< Cannonical mode
151 L4_VCON_ECHO = 000010, ///< Echo input
156 * \brief Set attributes of a Vcon.
157 * \ingroup l4_vcon_api
159 * \param vcon Vcon object.
160 * \param attr Attribute structure.
161 * \return Syscall return tag
163 L4_INLINE l4_msgtag_t
164 l4_vcon_set_attr(l4_cap_idx_t vcon, l4_vcon_attr_t const *attr) L4_NOTHROW;
169 L4_INLINE l4_msgtag_t
170 l4_vcon_set_attr_u(l4_cap_idx_t vcon, l4_vcon_attr_t const *attr,
171 l4_utcb_t *utcb) L4_NOTHROW;
174 * \brief Get attributes of a Vcon.
175 * \ingroup l4_vcon_api
177 * \param vcon Vcon object.
178 * \retval attr Attribute structure.
179 * \return Syscall return tag
181 L4_INLINE l4_msgtag_t
182 l4_vcon_get_attr(l4_cap_idx_t vcon, l4_vcon_attr_t *attr) L4_NOTHROW;
187 L4_INLINE l4_msgtag_t
188 l4_vcon_get_attr_u(l4_cap_idx_t vcon, l4_vcon_attr_t *attr,
189 l4_utcb_t *utcb) L4_NOTHROW;
193 * \brief Operations on the vcon objects.
194 * \ingroup l4_vcon_api
200 L4_VCON_WRITE_OP = 0UL, /**< Write */
201 L4_VCON_SET_ATTR_OP = 2UL, /**< Get console attributes */
202 L4_VCON_GET_ATTR_OP = 3UL, /**< Set console attributes */
205 /******* Implementations ********************/
207 L4_INLINE l4_msgtag_t
208 l4_vcon_send_u(l4_cap_idx_t vcon, char const *buf, int size, l4_utcb_t *utcb) L4_NOTHROW
210 l4_msg_regs_t *mr = l4_utcb_mr_u(utcb);
211 mr->mr[0] = L4_VCON_WRITE_OP;
213 __builtin_memcpy(&mr->mr[2], buf, size);
214 return l4_ipc_send(vcon, utcb,
215 l4_msgtag(L4_PROTO_LOG,
216 2 + (size + sizeof(l4_umword_t) - 1) / sizeof(l4_umword_t),
217 0, L4_MSGTAG_SCHEDULE),
221 L4_INLINE l4_msgtag_t
222 l4_vcon_send(l4_cap_idx_t vcon, char const *buf, int size) L4_NOTHROW
224 return l4_vcon_send_u(vcon, buf, size, l4_utcb());
228 l4_vcon_write_u(l4_cap_idx_t vcon, char const *buf, int size, l4_utcb_t *utcb) L4_NOTHROW
232 if (size > L4_VCON_WRITE_SIZE)
233 size = L4_VCON_WRITE_SIZE;
235 t = l4_vcon_send_u(vcon, buf, size, utcb);
236 if (l4_msgtag_has_error(t))
243 l4_vcon_write(l4_cap_idx_t vcon, char const *buf, int size) L4_NOTHROW
245 return l4_vcon_write_u(vcon, buf, size, l4_utcb());
249 l4_vcon_read_u(l4_cap_idx_t vcon, char *buf, int size, l4_utcb_t *utcb) L4_NOTHROW
257 mr = l4_utcb_mr_u(utcb);
258 mr->mr[0] = size << 16;
260 ret = l4_error_u(l4_ipc_call(vcon, utcb,
261 l4_msgtag(L4_PROTO_LOG, 1, 0, 0),
262 L4_IPC_NEVER), utcb);
266 r = mr->mr[0] & ~(1U << 31);
268 if (!(mr->mr[0] & (1UL << 31))) // !eof
275 __builtin_memcpy(buf, &mr->mr[1], r < size ? r : size);
280 l4_vcon_read(l4_cap_idx_t vcon, char *buf, int size) L4_NOTHROW
282 return l4_vcon_read_u(vcon, buf, size, l4_utcb());
285 L4_INLINE l4_msgtag_t
286 l4_vcon_set_attr_u(l4_cap_idx_t vcon, l4_vcon_attr_t const *attr,
287 l4_utcb_t *utcb) L4_NOTHROW
289 l4_msg_regs_t *mr = l4_utcb_mr_u(utcb);
291 mr->mr[0] = L4_VCON_SET_ATTR_OP;
292 __builtin_memcpy(&mr->mr[1], attr, sizeof(*attr));
294 return l4_ipc_call(vcon, utcb,
295 l4_msgtag(L4_PROTO_LOG, 4, 0, 0),
299 L4_INLINE l4_msgtag_t
300 l4_vcon_set_attr(l4_cap_idx_t vcon, l4_vcon_attr_t const *attr) L4_NOTHROW
302 return l4_vcon_set_attr_u(vcon, attr, l4_utcb());
305 L4_INLINE l4_msgtag_t
306 l4_vcon_get_attr_u(l4_cap_idx_t vcon, l4_vcon_attr_t *attr,
307 l4_utcb_t *utcb) L4_NOTHROW
310 l4_msg_regs_t *mr = l4_utcb_mr_u(utcb);
312 mr->mr[0] = L4_VCON_GET_ATTR_OP;
314 res = l4_ipc_call(vcon, utcb,
315 l4_msgtag(L4_PROTO_LOG, 1, 0, 0),
317 if (l4_error_u(res, utcb) >= 0)
318 __builtin_memcpy(attr, &mr->mr[1], sizeof(*attr));
323 L4_INLINE l4_msgtag_t
324 l4_vcon_get_attr(l4_cap_idx_t vcon, l4_vcon_attr_t *attr) L4_NOTHROW
326 return l4_vcon_get_attr_u(vcon, attr, l4_utcb());