| 0,0 → 1,86 |
|---|
| /* |
| * Copyright (C) 2006 Martin Decky |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** @addtogroup ia32xen |
| * @{ |
| */ |
| /** |
| * @file |
| * @brief ia32xen console driver. |
| */ |
| |
| #include <arch/drivers/xconsole.h> |
| #include <putchar.h> |
| #include <console/chardev.h> |
| #include <console/console.h> |
| #include <arch/hypercall.h> |
| |
| #define MASK_INDEX(index, ring) ((index) & (sizeof(ring) - 1)) |
| |
| static bool asynchronous = false; |
| static void xen_putchar(chardev_t *d, const char ch); |
| |
| chardev_t xen_console; |
| static chardev_operations_t xen_ops = { |
| .write = xen_putchar |
| }; |
| |
| void xen_console_init(void) |
| { |
| chardev_initialize("xen_out", &xen_console, &xen_ops); |
| stdout = &xen_console; |
| if (!(start_info.flags & SIF_INITDOMAIN)) |
| asynchronous = true; |
| } |
| |
| void xen_putchar(chardev_t *d, const char ch) |
| { |
| if (asynchronous) { |
| uint32_t cons = console_page.out_cons; |
| uint32_t prod = console_page.out_prod; |
| |
| memory_barrier(); |
| |
| if ((prod - cons) > sizeof(console_page.out)) |
| return; |
| |
| if (ch == '\n') |
| console_page.out[MASK_INDEX(prod++, console_page.out)] = '\r'; |
| console_page.out[MASK_INDEX(prod++, console_page.out)] = ch; |
| |
| write_barrier(); |
| |
| console_page.out_prod = prod; |
| |
| xen_notify_remote(start_info.console_evtchn); |
| } else |
| xen_console_io(CONSOLE_IO_WRITE, 1, &ch); |
| } |
| |
| /** @} |
| */ |