mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-23 10:15:57 +01:00
56738a1c70
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
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
/* https://github.com/cirosantilli/linux-kernel-module-cheat#virt_to_phys */
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#include <asm/io.h> /* virt_to_phys */
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#include <linux/debugfs.h>
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#include <linux/delay.h> /* usleep_range */
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/module.h>
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#include <linux/seq_file.h> /* single_open, single_release */
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#include <linux/slab.h> /* kmalloc, kfree */
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static volatile u32 *kmalloc_ptr;
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static volatile u32 static_var;
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static struct dentry *debugfs_file;
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static int show(struct seq_file *m, void *v)
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{
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seq_printf(m,
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"*kmalloc_ptr = 0x%llx\n"
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"kmalloc_ptr = %px\n"
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"virt_to_phys(kmalloc_ptr) = 0x%llx\n"
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"static_var = 0x%llx\n"
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"&static_var = %px\n"
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"virt_to_phys(&static_var) = 0x%llx\n",
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(unsigned long long)*kmalloc_ptr,
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kmalloc_ptr,
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(unsigned long long)virt_to_phys((void *)kmalloc_ptr),
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(unsigned long long)static_var,
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&static_var,
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(unsigned long long)virt_to_phys((void *)&static_var)
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);
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return 0;
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}
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static int open(struct inode *inode, struct file *file)
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{
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return single_open(file, show, NULL);
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}
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static const struct file_operations fops = {
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.llseek = seq_lseek,
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.open = open,
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.owner = THIS_MODULE,
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.read = seq_read,
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.release = single_release,
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};
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static int myinit(void)
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{
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kmalloc_ptr = kmalloc(sizeof(kmalloc_ptr), GFP_KERNEL);
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*kmalloc_ptr = 0x12345678;
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static_var = 0x12345678;
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debugfs_file = debugfs_create_file("lkmc_virt_to_phys", S_IRUSR, NULL, NULL, &fops);
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return 0;
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}
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static void myexit(void)
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{
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debugfs_remove(debugfs_file);
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kfree((void *)kmalloc_ptr);
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}
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module_init(myinit)
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module_exit(myexit)
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MODULE_LICENSE("GPL");
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