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From: Rusty Russell <rusty@rustcorp.com.au> To: Andrew Morton <akpm@linux-foundation.org> Cc: lkml - Kernel Mailing List <linux-kernel@vger.kernel.org>, virtualization <virtualization@lists.osdl.org> Subject: [PATCH 6/8] lguest: trivial guest console driver Date: Mon, 12 Feb 2007 14:53:25 +1100 [thread overview] Message-ID: <1171252405.10409.39.camel@localhost.localdomain> (raw) In-Reply-To: <1171252321.10409.36.camel@localhost.localdomain> A trivial driver to have a basic lguest console, using the hvc_console infrastructure. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> diff -r aaa62bd9788a drivers/char/Makefile --- a/drivers/char/Makefile Mon Feb 12 13:01:16 2007 +1100 +++ b/drivers/char/Makefile Mon Feb 12 13:01:45 2007 +1100 @@ -44,6 +44,7 @@ obj-$(CONFIG_SX) += sx.o generic_serial obj-$(CONFIG_SX) += sx.o generic_serial.o obj-$(CONFIG_RIO) += rio/ generic_serial.o obj-$(CONFIG_HVC_CONSOLE) += hvc_vio.o hvsi.o +obj-$(CONFIG_LGUEST_GUEST) += hvc_lguest.o obj-$(CONFIG_HVC_ISERIES) += hvc_iseries.o obj-$(CONFIG_HVC_RTAS) += hvc_rtas.o obj-$(CONFIG_HVC_DRIVER) += hvc_console.o diff -r aaa62bd9788a drivers/char/hvc_lguest.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/drivers/char/hvc_lguest.c Mon Feb 12 13:01:19 2007 +1100 @@ -0,0 +1,99 @@ +/* Simple console for lguest. + * + * Copyright (C) 2006 Rusty Russell, IBM Corporation + * + * 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/err.h> +#include <linux/init.h> +#include <asm/lguest_device.h> +#include "hvc_console.h" + +static int cons_irq; +static int cons_offset; +static char inbuf[256]; +static struct lguest_dma cons_input = { .used_len = 0, + .addr[0] = __pa(inbuf), + .len[0] = sizeof(inbuf), + .len[1] = 0 }; + +static int get_chars(u32 vtermno, char *buf, int count) +{ + if (!cons_input.used_len) + return 0; + + if (cons_input.used_len - cons_offset < count) + count = cons_input.used_len - cons_offset; + + memcpy(buf, inbuf + cons_offset, count); + cons_offset += count; + if (cons_offset == cons_input.used_len) { + cons_offset = 0; + cons_input.used_len = 0; + } + return count; +} + +static int put_chars(u32 vtermno, const char *buf, int count) +{ + struct lguest_dma dma; + + /* FIXME: what if it's over a page boundary? */ + dma.len[0] = count; + dma.len[1] = 0; + dma.addr[0] = __pa(buf); + + hcall(LHCALL_SEND_DMA, 4, __pa(&dma), 0); + return count; +} + +struct hv_ops lguest_cons = { + .get_chars = get_chars, + .put_chars = put_chars, +}; + +static int __init cons_init(void) +{ + if (strcmp(paravirt_ops.name, "lguest") != 0) + return 0; + + return hvc_instantiate(0, 0, &lguest_cons); +} +console_initcall(cons_init); + +static int lguestcons_probe(struct lguest_device *lhdev) +{ + cons_irq = lhdev->index+1; + lhdev->private = hvc_alloc(0, cons_irq, &lguest_cons, 256); + if (IS_ERR(lhdev->private)) + return PTR_ERR(lhdev->private); + + if (!hcall(LHCALL_BIND_DMA, 0, __pa(&cons_input), (1<<8)+cons_irq)) + printk("lguest console: failed to bind buffer.\n"); + return 0; +} + +static struct lguest_driver lguestcons_drv = { + .name = "lguestcons", + .owner = THIS_MODULE, + .device_type = LGUEST_DEVICE_T_CONSOLE, + .probe = lguestcons_probe, +}; + +static int __init hvc_lguest_init(void) +{ + return register_lguest_driver(&lguestcons_drv); +} +module_init(hvc_lguest_init);
next prev parent reply other threads:[~2007-02-12 3:54 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2007-02-12 3:32 [PATCH 1/7] cleanup: paravirt unhandled fallthrough Rusty Russell 2007-02-12 3:33 ` [PATCH 2/7] cleanup: Initialize esp0 properly all the time Rusty Russell 2007-02-12 3:34 ` [PATCH 3/7] cleanup: Make hvc_console.c compile on non-PowerPC Rusty Russell 2007-02-12 3:35 ` [PATCH 4/7] cleanup: Move mce_disabled to asm/mce.h Rusty Russell 2007-02-12 3:36 ` [PATCH 5/7] cleanup: Rename cpu_gdt_descr and remove extern declaration from smpboot.c Rusty Russell 2007-02-12 3:37 ` [PATCH 6/7] cleanup: Remove extern declaration from mm/discontig.c, put in header Rusty Russell 2007-02-12 3:39 ` [PATCH 7/7] cleanup: make disable_acpi() valid w/o CONFIG_ACPI Rusty Russell 2007-02-12 3:41 ` [PATCH 1/2] lguest preparation: EXPORT_SYMBOL_GPL 5 functions Rusty Russell 2007-02-12 3:42 ` [PATCH 2/2] lguest preparation: expose futex infrastructure: get_futex_key, get_key_refs and drop_key_refs Rusty Russell 2007-02-12 3:44 ` [PATCH 1/8] lguest: Kconfig and headers Rusty Russell 2007-02-12 3:46 ` [PATCH 2/8] lguest: the host code (lg.ko) Rusty Russell 2007-02-12 3:48 ` [PATCH 3/8] lguest: Guest code Rusty Russell 2007-02-12 3:50 ` [PATCH 4/8] lguest: Makefile Rusty Russell 2007-02-12 3:52 ` [PATCH 5/8] lguest: trivial guest network driver Rusty Russell 2007-02-12 3:53 ` Rusty Russell [this message] 2007-02-12 3:54 ` [PATCH 7/8] lguest: trivial guest block driver Rusty Russell 2007-02-12 3:55 ` [PATCH 8/8] lguest: documentatation and example launcher Rusty Russell 2007-02-12 4:43 ` [PATCH 7/8] lguest: trivial guest block driver Jens Axboe 2007-02-12 5:27 ` Rusty Russell 2007-02-12 5:32 ` Jens Axboe 2007-02-12 5:33 ` Jens Axboe 2007-02-12 7:09 ` Rusty Russell 2007-02-12 15:01 ` Jens Axboe 2007-02-13 0:25 ` Rusty Russell 2007-02-13 0:44 ` Jens Axboe 2007-02-12 15:55 ` [PATCH 5/8] lguest: trivial guest network driver Herbert Xu 2007-02-13 2:15 ` Rusty Russell 2007-02-13 14:06 ` Herbert Xu 2007-02-14 4:47 ` Rusty Russell 2007-02-14 13:57 ` Herbert Xu 2007-02-14 23:00 ` Rusty Russell 2007-02-12 16:02 ` [PATCH 1/8] lguest: Kconfig and headers James Morris 2007-02-13 5:09 ` [PATCH 7/7] cleanup: make disable_acpi() valid w/o CONFIG_ACPI Len Brown 2007-02-12 9:16 ` [PATCH 5/7] cleanup: Rename cpu_gdt_descr and remove extern declaration from smpboot.c Zachary Amsden
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