lkmc v2-rc

Unsquashed version at v2-rc-unsquashed, but that cannot be merged as it
breaks bisects at several points. All bugs will not bisect to this
humongous change.

It all started with a conversion of the Bash scripts to Python, mainly
because I couldn't stand not being able to properly use --options for
run which has a million options.

Then since that required a full testing, I decided to do all the
refactorings that I had in mind at once, and so I did and it became
v2-rc.

This is the largest patch I have ever done! OMG a few weeks of extra time.
I'm never writing a Bash script for anything that starts getting big again.

Some of the features are:

* separate build-qemu and build-gem5 commands
* common: convert scripts to python. Add --option for everything
* rename build to build-buildroot now that we are splitting all the build
  commands, Linux kernel to follow
* move all git submodules to submodules/ and all buildroot packages to
  packages/
* refactor the out/ structure. Keep projects on toplevel, because guest
  projects separate archs and host ones don't, making a toplevel arch wrong
* do-release: rename to just release
  https://stackoverflow.com/questions/16174992/cant-get-argparse-to-read-quoted-string-with-dashes-in-it
* run: add --terminal and explain gem5 pdb
* just track the lvimrc
* store CLI kernel config fragment inside buildlroot to avoid conflicts
* gem5: document m5 initparam
* readme: make a bunch of things awesomer
* readme: fix broken refs
* parsec-benchmark: update to 75d55ac446a43c47efb1044844a108c6c330184c
  Could not fetch otherwise.
* gem5: M5_OVERRIDE_PY_SOURCE

packages/kernel_modules/pci_min.c

@@ -0,0 +1,91 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#pci_min */
+
+#include <linux/cdev.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/uaccess.h> /* copy_from_user, copy_to_user */
+
+#define BAR 0
+#define CDEV_NAME "lkmc_hw_pci_min"
+#define EDU_DEVICE_ID 0x11e9
+#define QEMU_VENDOR_ID 0x1234
+
+static struct pci_device_id id_table[] = {
+    { PCI_DEVICE(QEMU_VENDOR_ID, EDU_DEVICE_ID), },
+    { 0, }
+};
+MODULE_DEVICE_TABLE(pci, id_table);
+static int major;
+static struct pci_dev *pdev;
+static void __iomem *mmio;
+static struct file_operations fops = {
+    .owner   = THIS_MODULE,
+};
+
+static irqreturn_t irq_handler(int irq, void *dev)
+{
+    pr_info("irq_handler irq = %d dev = %d\n", irq, *(int *)dev);
+    iowrite32(0, mmio + 4);
+    return IRQ_HANDLED;
+}
+
+static int probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+    pr_info("probe\n");
+    major = register_chrdev(0, CDEV_NAME, &fops);
+    pdev = dev;
+    if (pci_enable_device(dev) < 0) {
+        dev_err(&(pdev->dev), "pci_enable_device\n");
+        goto error;
+    }
+    if (pci_request_region(dev, BAR, "myregion0")) {
+        dev_err(&(pdev->dev), "pci_request_region\n");
+        goto error;
+    }
+    mmio = pci_iomap(pdev, BAR, pci_resource_len(pdev, BAR));
+    pr_info("dev->irq = %u\n", dev->irq);
+    if (request_irq(dev->irq, irq_handler, IRQF_SHARED, "pci_irq_handler0", &major) < 0) {
+        dev_err(&(dev->dev), "request_irq\n");
+        goto error;
+    }
+    iowrite32(0x12345678, mmio);
+    return 0;
+error:
+    return 1;
+}
+
+static void remove(struct pci_dev *dev)
+{
+    pr_info("remove\n");
+    free_irq(dev->irq, &major);
+    pci_release_region(dev, BAR);
+    unregister_chrdev(major, CDEV_NAME);
+}
+
+static struct pci_driver pci_driver = {
+    .name     = CDEV_NAME,
+    .id_table = id_table,
+    .probe    = probe,
+    .remove   = remove,
+};
+
+static int myinit(void)
+{
+    if (pci_register_driver(&pci_driver) < 0) {
+        return 1;
+    }
+    return 0;
+}
+
+static void myexit(void)
+{
+    pci_unregister_driver(&pci_driver);
+}
+
+module_init(myinit);
+module_exit(myexit);
+MODULE_LICENSE("GPL");