125 void msnd_fifo_init(msnd_fifo *f)  in msnd_fifo_init()  argument
127 	f->data = NULL;  in msnd_fifo_init()
130 void msnd_fifo_free(msnd_fifo *f)  in msnd_fifo_free()  argument
132 	if (f->data) {  in msnd_fifo_free()
133 		vfree(f->data);  in msnd_fifo_free()
134 		f->data = NULL;  in msnd_fifo_free()
138 int msnd_fifo_alloc(msnd_fifo *f, size_t n)  in msnd_fifo_alloc()  argument
140 	msnd_fifo_free(f);  in msnd_fifo_alloc()
141 	f->data = (char *)vmalloc(n);  in msnd_fifo_alloc()
142 	f->n = n;  in msnd_fifo_alloc()
143 	f->tail = 0;  in msnd_fifo_alloc()
144 	f->head = 0;  in msnd_fifo_alloc()
145 	f->len = 0;  in msnd_fifo_alloc()
147 	if (!f->data)  in msnd_fifo_alloc()
153 void msnd_fifo_make_empty(msnd_fifo *f)  in msnd_fifo_make_empty()  argument
155 	f->len = f->tail = f->head = 0;  in msnd_fifo_make_empty()
158 int msnd_fifo_write(msnd_fifo *f, const char *buf, size_t len)  in msnd_fifo_write()  argument
162 	while ((count < len) && (f->len != f->n)) {  in msnd_fifo_write()
166 		if (f->head <= f->tail) {  in msnd_fifo_write()
168 			if (nwritten > f->n - f->tail)  in msnd_fifo_write()
169 				nwritten = f->n - f->tail;  in msnd_fifo_write()
172 			nwritten = f->head - f->tail;  in msnd_fifo_write()
177 		isa_memcpy_fromio(f->data + f->tail, (unsigned long) buf, nwritten);  in msnd_fifo_write()
181 		f->len += nwritten;  in msnd_fifo_write()
182 		f->tail += nwritten;  in msnd_fifo_write()
183 		f->tail %= f->n;  in msnd_fifo_write()
189 int msnd_fifo_read(msnd_fifo *f, char *buf, size_t len)  in msnd_fifo_read()  argument
193 	while ((count < len) && (f->len > 0)) {  in msnd_fifo_read()
197 		if (f->tail <= f->head) {  in msnd_fifo_read()
199 			if (nread > f->n - f->head)  in msnd_fifo_read()
200 				nread = f->n - f->head;  in msnd_fifo_read()
203 			nread = f->tail - f->head;  in msnd_fifo_read()
208 		isa_memcpy_toio((unsigned long) buf, f->data + f->head, nread);  in msnd_fifo_read()
212 		f->len -= nread;  in msnd_fifo_read()
213 		f->head += nread;  in msnd_fifo_read()
214 		f->head %= f->n;  in msnd_fifo_read()