diff options
Diffstat (limited to 'drivers/char/hvc_xen.c')
| -rw-r--r-- | drivers/char/hvc_xen.c | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/drivers/char/hvc_xen.c b/drivers/char/hvc_xen.c deleted file mode 100644 index dd68f8541c2..00000000000 --- a/drivers/char/hvc_xen.c +++ /dev/null @@ -1,159 +0,0 @@ -/* - * xen console driver interface to hvc_console.c - * - * (c) 2007 Gerd Hoffmann <kraxel@suse.de> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include <linux/console.h> -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/init.h> -#include <linux/types.h> - -#include <asm/xen/hypervisor.h> -#include <xen/page.h> -#include <xen/events.h> -#include <xen/interface/io/console.h> -#include <xen/hvc-console.h> - -#include "hvc_console.h" - -#define HVC_COOKIE 0x58656e /* "Xen" in hex */ - -static struct hvc_struct *hvc; -static int xencons_irq; - -/* ------------------------------------------------------------------ */ - -static inline struct xencons_interface *xencons_interface(void) -{ - return mfn_to_virt(xen_start_info->console.domU.mfn); -} - -static inline void notify_daemon(void) -{ - /* Use evtchn: this is called early, before irq is set up. */ - notify_remote_via_evtchn(xen_start_info->console.domU.evtchn); -} - -static int write_console(uint32_t vtermno, const char *data, int len) -{ - struct xencons_interface *intf = xencons_interface(); - XENCONS_RING_IDX cons, prod; - int sent = 0; - - cons = intf->out_cons; - prod = intf->out_prod; - mb(); /* update queue values before going on */ - BUG_ON((prod - cons) > sizeof(intf->out)); - - while ((sent < len) && ((prod - cons) < sizeof(intf->out))) - intf->out[MASK_XENCONS_IDX(prod++, intf->out)] = data[sent++]; - - wmb(); /* write ring before updating pointer */ - intf->out_prod = prod; - - notify_daemon(); - return sent; -} - -static int read_console(uint32_t vtermno, char *buf, int len) -{ - struct xencons_interface *intf = xencons_interface(); - XENCONS_RING_IDX cons, prod; - int recv = 0; - - cons = intf->in_cons; - prod = intf->in_prod; - mb(); /* get pointers before reading ring */ - BUG_ON((prod - cons) > sizeof(intf->in)); - - while (cons != prod && recv < len) - buf[recv++] = intf->in[MASK_XENCONS_IDX(cons++, intf->in)]; - - mb(); /* read ring before consuming */ - intf->in_cons = cons; - - notify_daemon(); - return recv; -} - -static struct hv_ops hvc_ops = { - .get_chars = read_console, - .put_chars = write_console, -}; - -static int __init xen_init(void) -{ - struct hvc_struct *hp; - - if (!is_running_on_xen()) - return 0; - - xencons_irq = bind_evtchn_to_irq(xen_start_info->console.domU.evtchn); - if (xencons_irq < 0) - xencons_irq = 0 /* NO_IRQ */; - hp = hvc_alloc(HVC_COOKIE, xencons_irq, &hvc_ops, 256); - if (IS_ERR(hp)) - return PTR_ERR(hp); - - hvc = hp; - return 0; -} - -static void __exit xen_fini(void) -{ - if (hvc) - hvc_remove(hvc); -} - -static int xen_cons_init(void) -{ - if (!is_running_on_xen()) - return 0; - - hvc_instantiate(HVC_COOKIE, 0, &hvc_ops); - return 0; -} - -module_init(xen_init); -module_exit(xen_fini); -console_initcall(xen_cons_init); - -static void xenboot_write_console(struct console *console, const char *string, - unsigned len) -{ - unsigned int linelen, off = 0; - const char *pos; - - while (off < len && NULL != (pos = strchr(string+off, '\n'))) { - linelen = pos-string+off; - if (off + linelen > len) - break; - write_console(0, string+off, linelen); - write_console(0, "\r\n", 2); - off += linelen + 1; - } - if (off < len) - write_console(0, string+off, len-off); -} - -struct console xenboot_console = { - .name = "xenboot", - .write = xenboot_write_console, - .flags = CON_PRINTBUFFER | CON_BOOT, -}; |