diff options
| -rw-r--r-- | .gitignore | 6 | ||||
| -rw-r--r-- | Makefile | 4 | ||||
| -rw-r--r-- | cr0.c | 22 | ||||
| -rw-r--r-- | handlers/Makefile | 1 | ||||
| -rw-r--r-- | handlers/chardev.c | 33 | ||||
| -rw-r--r-- | hello/Makefile | 1 | ||||
| -rw-r--r-- | hello/hello-chardev.c | 23 | ||||
| -rw-r--r-- | lists.c | 41 |
8 files changed, 122 insertions, 9 deletions
diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ec70db6 --- /dev/null +++ b/.gitignore @@ -0,0 +1,6 @@ +*.o* +*.ko* +*.mod.* +Module.symvers +modules.order +.tmp_versions @@ -1,4 +1,6 @@ -obj-m += syscall.o +#obj-m += syscall.o +#obj-m += cr0.o +obj-m += lists.o all: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules @@ -0,0 +1,22 @@ +#include <linux/kernel.h> +#include <linux/module.h> +#include <asm/system.h> + +int init_module(void) +{ + int cr0 = native_read_cr0(); + printk(KERN_INFO "cr0 before: %x\n", cr0); + cr0 = cr0 >> 1; + cr0 = cr0 << 1; + native_write_cr0(cr0); + cr0 = native_read_cr0(); + printk(KERN_INFO "cr0 after: %x\n", cr0); + return 0; +} + +void cleanup_module(void) +{ + printk(KERN_INFO "cr0 unloaded\n"); +} + +MODULE_LICENSE("GPL"); diff --git a/handlers/Makefile b/handlers/Makefile index 10043eb..c9a417c 100644 --- a/handlers/Makefile +++ b/handlers/Makefile @@ -1,5 +1,6 @@ obj-m += chardev.o obj-m += procfs1.o +export-objs += chardev.o all: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules diff --git a/handlers/chardev.c b/handlers/chardev.c index 3594bce..1c1f923 100644 --- a/handlers/chardev.c +++ b/handlers/chardev.c @@ -1,6 +1,7 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/fs.h> +#include <linux/sched.h> #include <asm/uaccess.h> #include "chardev.h" @@ -11,9 +12,15 @@ static int Major; static int opened = 0; -static char msg[BUF_LEN]; +static char chardev_buffer[BUF_LEN]; static char* msg_ptr; +void dumb(void) +{ + printk(KERN_INFO "DUMB EXECUTED\n"); +} +EXPORT_SYMBOL(dumb); + static struct file_operations fops = { .read = device_read, .write = device_write, @@ -23,6 +30,7 @@ static struct file_operations fops = { int init_module(void) { + Major = register_chrdev(0, DEVICE_NAME, &fops); if (Major < 0) { @@ -53,9 +61,9 @@ static int device_open(struct inode* inode, struct file* filp) opened++; if (counter++ == 0) - sprintf(msg, "Come on, write something here :D\n"); + sprintf(chardev_buffer, "Come on, write something here :D\n"); - msg_ptr = msg; + msg_ptr = chardev_buffer; try_module_get(THIS_MODULE); return SUCCESS; @@ -70,18 +78,27 @@ static int device_release(struct inode* inode, struct file* filp) return 0; } -static ssize_t device_read(struct file* filp, char* buffer, size_t len, loff_t* off) +static ssize_t device_read(struct file* filp, char* buff, size_t len, loff_t* off) { int bytes = 0; + char strpid[14]; + snprintf(strpid, 14, "PID: %d", (current->pid)); if (*msg_ptr == 0) return 0; while (len-- && *msg_ptr) { - put_user(*msg_ptr++, buffer++); + put_user(*msg_ptr++, buff++); bytes++; } + copy_to_user(buff, strpid, 14); + bytes += 14; + buff += 14; + + put_user('\n', buff++); + bytes++; + return bytes; } @@ -95,11 +112,11 @@ static ssize_t device_write(struct file* filp, const char* buff, size_t len, lof } while (len--) { - get_user(msg[bytes], buff++); + get_user(chardev_buffer[bytes], buff++); bytes++; } - msg[bytes] = '\0'; + chardev_buffer[bytes] = '\0'; - msg_ptr = msg; + msg_ptr = chardev_buffer; return bytes; } diff --git a/hello/Makefile b/hello/Makefile index d63aa3d..f6299e0 100644 --- a/hello/Makefile +++ b/hello/Makefile @@ -2,6 +2,7 @@ obj-m += hello-1.o obj-m += hello-2.o obj-m += hello-3.o obj-m += hello-4.o +obj-m += hello-chardev.o obj-m += startstop.o startstop-objs := start.o stop.o diff --git a/hello/hello-chardev.c b/hello/hello-chardev.c new file mode 100644 index 0000000..a8a80d8 --- /dev/null +++ b/hello/hello-chardev.c @@ -0,0 +1,23 @@ +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> + +extern void dumb(void); + +static int __init hello_2_init(void) +{ +// printk(KERN_INFO "Buffer: %s (%p)\n", chardev_buffer, chardev_buffer); + dumb(); + return 0; +} + +static void __exit hello_2_exit(void) +{ +} + +module_init(hello_2_init); +module_exit(hello_2_exit); + +MODULE_AUTHOR("Guillermo Ramos"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Módulo tonto"); @@ -0,0 +1,41 @@ +#include <linux/kernel.h> +#include <linux/module.h> + +#define LENGTH 5 + +struct node { + struct list_head l; + int dato; +}; + +int init_module(void) +{ + int i; + struct node head, aux[LENGTH], *aux2; + struct list_head* iter; + + INIT_LIST_HEAD(&head.l); + head.dato = 666; + + for (i = 0; i < LENGTH; i++) { + aux[i].dato = i; + + list_add_tail(&aux[i].l, &head.l); + } + + list_for_each(iter, &head.l) { + aux2 = list_entry(iter, struct node, l); + printk(KERN_INFO "%d", aux2->dato); + } + + printk(KERN_INFO "Por cierto, en 0x0 hay: %d", ((struct node *)0)->dato); + + return 0; +} + +void cleanup_module(void) +{ +} + +MODULE_AUTHOR("Guillermo Ramos"); +MODULE_LICENSE("GPL"); |