You can not make kernel-mode device drivers in C# as the runtime can’t be safely loaded into ring0 and operate as expected. Additionally, C# doesn’t create binaries suitable for loading as device drivers, particularly regarding entry points that drivers need to expose. The dependency on the runtime to jump in and analyze and JIT the … Read more
Ok ! So i’ve found a solution to the problem I was having! On the Nexus 7, when the NFC is turned on, it gets its information from a config file in “/etc/” called “libnfc-brcm-20791b05.conf” Inside of this file there is a parameter called “NFA_DM_START_UP_CFG” By default, it looks like this: NFA_DM_START_UP_CFG={42:CB:01:01:A5:01:01:CA:14:00:00:00:00:0E:C0:D4:01:00:0F:00:00:00:00:C0:C6:2D:00:14:0A:B5:03:01:02:FF:80:01:01:C9:03:03:0F:AB:5B:01:00:B2:04:E8:03:00:00:CF:02:02:08:B1:06:00:20:00:00:00:12:C2:02:01:C8} To edit the … Read more
Another option is to use an ICE or JTAG controller, and GDB. This ‘hardware’ solution is especially used with embedded systems. But for instance QEMU offers similar features: start QEMU with a GDB ‘remote’ stub which listens on ‘localhost:1234’ : qemu -s …, then with GDB, you open the kernel file vmlinux compiled with debug … Read more
I have found how to run Python 3.8 notebook on Colab. install Anaconda3 add (fake) google.colab library start jupyterlab access it with ngrok Here’s the code # install Anaconda3 !wget -qO ac.sh https://repo.anaconda.com/archive/Anaconda3-2020.07-Linux-x86_64.sh !bash ./ac.sh -b # a fake google.colab library !ln -s /usr/local/lib/python3.7/dist-packages/google \ /root/anaconda3/lib/python3.8/site-packages/google # start jupyterlab, which now has Python3 = 3.8 … Read more
If you’re doing assembly programming under Windows you don’t do manual syscalls. You use NTDLL and the Native API to do that for you. The Native API is simply a wrapper around the kernelmode side of things. All it does is perform a syscall for the correct API. You should NEVER need to manually syscall … Read more
You can enable or disable the hardware prefetchers using msr-tools http://www.kernel.org/pub/linux/utils/cpu/msr-tools/. The following enables the hardware prefetcher (by unsetting bit 9): [root@… msr-tools-1.2]# ./wrmsr -p 0 0x1a0 0x60628e2089 [root@… msr-tools-1.2]# ./rdmsr 0x1a0 60628e2089 The following disables the hardware prefetcher (by enabling bit 9): [root@… msr-tools-1.2]# ./wrmsr -p 0 0x1a0 0x60628e2289 [root@… msr-tools-1.2]# ./rdmsr 0x1a0 60628e2289 … Read more
edu in-tree educational PCI device https://github.com/qemu/qemu/blob/v2.7.0/hw/misc/edu.c https://github.com/qemu/qemu/blob/v2.7.0/docs/specs/edu.txt It is very easy to understand and well documented, so I recommend that you study it. It exposes a minimal PCI device, with basic IO, interrupt generation, and DMA. I’ve written a minimal Linux kernel module + userland tests to play with it at: https://github.com/cirosantilli/linux-kernel-module-cheat/blob/6788a577c394a2fc512d8f3df0806d84dc09f355/rootfs_overlay/pci.sh https://github.com/cirosantilli/linux-kernel-module-cheat/blob/6788a577c394a2fc512d8f3df0806d84dc09f355/kernel_module/pci.c Out-of-tree devices … Read more
The vsyscall and vDSO segments are two mechanisms used to accelerate certain system calls in Linux. For instance, gettimeofday is usually invoked through this mechanism. The first mechanism introduced was vsyscall, which was added as a way to execute specific system calls which do not need any real level of privilege to run in order … Read more
There are a lot of links after this brief overview of what is involved in writing an OS for the X86 platform. The link that appears to be most promising (www.nondot.org/sabre/os/articles) is no longer available, so you’ll need to poke through the Archive.org version to read it. At the end of the day the bootloader … Read more