[PATCH 1/2] Move /dev/zero to separate unit

[PATCH 1/2] Move /dev/zero to separate unit

[Alexander Shiyan]

This patch allows to present "/dev/zero" always in system and not
depending  of mem-command. Standard files allow to test other memory
devices, not only "mem", such as NOR, NAND, MCI-devices e.t.c.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
---
 commands/Makefile |    1 +
 commands/mem.c    |   29 -----------------------------
 commands/stddev.c |   51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 52 insertions(+), 29 deletions(-)
 create mode 100644 commands/stddev.c

diff --git a/commands/Makefile b/commands/Makefile
index 4c8a0a9..d39c466 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -1,3 +1,4 @@
+obj-y				+= stddev.o
 obj-$(CONFIG_CMD_BOOTM)		+= bootm.o
 obj-$(CONFIG_CMD_UIMAGE)	+= uimage.o
 obj-$(CONFIG_CMD_LINUX16)	+= linux16.o
diff --git a/commands/mem.c b/commands/mem.c
index 080bfde..9a67cf3 100644
--- a/commands/mem.c
+++ b/commands/mem.c
@@ -623,32 +623,3 @@ static int mem_init(void)
 }
 
 device_initcall(mem_init);
-
-static ssize_t zero_read(struct cdev *cdev, void *buf, size_t count, ulong offset, ulong flags)
-{
-	memset(buf, 0, count);
-	return count;
-}
-
-static struct file_operations zeroops = {
-	.read  = zero_read,
-	.lseek = dev_lseek_default,
-};
-
-static int zero_init(void)
-{
-	struct cdev *cdev;
-
-	cdev = xzalloc(sizeof (*cdev));
-
-	cdev->name = "zero";
-	cdev->size = ~0;
-	cdev->ops = &zeroops;
-
-	devfs_create(cdev);
-
-	return 0;
-}
-
-device_initcall(zero_init);
-
diff --git a/commands/stddev.c b/commands/stddev.c
new file mode 100644
index 0000000..18fea94
--- /dev/null
+++ b/commands/stddev.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <init.h>
+
+static ssize_t zero_read(struct cdev *cdev, void *buf, size_t count, ulong offset, ulong flags)
+{
+	memset(buf, 0, count);
+	return count;
+}
+
+static struct file_operations zeroops = {
+	.read  = zero_read,
+	.lseek = dev_lseek_default,
+};
+
+static int zero_init(void)
+{
+	struct cdev *cdev;
+
+	cdev = xzalloc(sizeof (*cdev));
+
+	cdev->name = "zero";
+	cdev->size = ~0;
+	cdev->ops = &zeroops;
+
+	devfs_create(cdev);
+
+	return 0;
+}
+
+device_initcall(zero_init);
-- 
1.7.3.4


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[PATCH 2/2] Added "/dev/full" and "/dev/null" devices

[Alexander Shiyan]

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
---
 commands/stddev.c |   55 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 55 insertions(+), 0 deletions(-)

diff --git a/commands/stddev.c b/commands/stddev.c
index 18fea94..8995fad 100644
--- a/commands/stddev.c
+++ b/commands/stddev.c
@@ -49,3 +49,58 @@ static int zero_init(void)
 }
 
 device_initcall(zero_init);
+
+static ssize_t full_read(struct cdev *cdev, void *buf, size_t count, ulong offset, ulong flags)
+{
+	memset(buf, 0xff, count);
+	return count;
+}
+
+static struct file_operations fullops = {
+	.read  = full_read,
+	.lseek = dev_lseek_default,
+};
+
+static int full_init(void)
+{
+	struct cdev *cdev;
+
+	cdev = xzalloc(sizeof (*cdev));
+
+	cdev->name = "full";
+	cdev->size = ~0;
+	cdev->ops = &fullops;
+
+	devfs_create(cdev);
+
+	return 0;
+}
+
+device_initcall(full_init);
+
+static ssize_t null_write(struct cdev *cdev, const void *buf, size_t count, ulong offset, ulong flags)
+{
+	return count;
+}
+
+static struct file_operations nullops = {
+	.write = null_write,
+	.lseek = dev_lseek_default,
+};
+
+static int null_init(void)
+{
+	struct cdev *cdev;
+
+	cdev = xzalloc(sizeof (*cdev));
+
+	cdev->name = "null";
+	cdev->size = 0;
+	cdev->ops = &nullops;
+
+	devfs_create(cdev);
+
+	return 0;
+}
+
+device_initcall(null_init);
-- 
1.7.3.4


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Re: [PATCH 1/2] Move /dev/zero to separate unit

[Sascha Hauer]

On Sat, Jun 09, 2012 at 11:34:25AM +0400, Alexander Shiyan wrote:
> This patch allows to present "/dev/zero" always in system and not
> depending  of mem-command. Standard files allow to test other memory
> devices, not only "mem", such as NOR, NAND, MCI-devices e.t.c.
> 
> Signed-off-by: Alexander Shiyan <shc_work@mail.ru>

Applied to -next. Thanks

Sascha

> ---
>  commands/Makefile |    1 +
>  commands/mem.c    |   29 -----------------------------
>  commands/stddev.c |   51 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 52 insertions(+), 29 deletions(-)
>  create mode 100644 commands/stddev.c
> 
> diff --git a/commands/Makefile b/commands/Makefile
> index 4c8a0a9..d39c466 100644
> --- a/commands/Makefile
> +++ b/commands/Makefile
> @@ -1,3 +1,4 @@
> +obj-y				+= stddev.o
>  obj-$(CONFIG_CMD_BOOTM)		+= bootm.o
>  obj-$(CONFIG_CMD_UIMAGE)	+= uimage.o
>  obj-$(CONFIG_CMD_LINUX16)	+= linux16.o
> diff --git a/commands/mem.c b/commands/mem.c
> index 080bfde..9a67cf3 100644
> --- a/commands/mem.c
> +++ b/commands/mem.c
> @@ -623,32 +623,3 @@ static int mem_init(void)
>  }
>  
>  device_initcall(mem_init);
> -
> -static ssize_t zero_read(struct cdev *cdev, void *buf, size_t count, ulong offset, ulong flags)
> -{
> -	memset(buf, 0, count);
> -	return count;
> -}
> -
> -static struct file_operations zeroops = {
> -	.read  = zero_read,
> -	.lseek = dev_lseek_default,
> -};
> -
> -static int zero_init(void)
> -{
> -	struct cdev *cdev;
> -
> -	cdev = xzalloc(sizeof (*cdev));
> -
> -	cdev->name = "zero";
> -	cdev->size = ~0;
> -	cdev->ops = &zeroops;
> -
> -	devfs_create(cdev);
> -
> -	return 0;
> -}
> -
> -device_initcall(zero_init);
> -
> diff --git a/commands/stddev.c b/commands/stddev.c
> new file mode 100644
> index 0000000..18fea94
> --- /dev/null
> +++ b/commands/stddev.c
> @@ -0,0 +1,51 @@
> +/*
> + * Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
> + *
> + * See file CREDITS for list of people who contributed to this
> + * project.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * 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
> + * MA 02111-1307 USA
> + */
> +
> +#include <common.h>
> +#include <init.h>
> +
> +static ssize_t zero_read(struct cdev *cdev, void *buf, size_t count, ulong offset, ulong flags)
> +{
> +	memset(buf, 0, count);
> +	return count;
> +}
> +
> +static struct file_operations zeroops = {
> +	.read  = zero_read,
> +	.lseek = dev_lseek_default,
> +};
> +
> +static int zero_init(void)
> +{
> +	struct cdev *cdev;
> +
> +	cdev = xzalloc(sizeof (*cdev));
> +
> +	cdev->name = "zero";
> +	cdev->size = ~0;
> +	cdev->ops = &zeroops;
> +
> +	devfs_create(cdev);
> +
> +	return 0;
> +}
> +
> +device_initcall(zero_init);
> -- 
> 1.7.3.4
> 
> 
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> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox
> 

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