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CaledoniaProject/write_cr0.c

Last active July 17, 2023 07:57
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Disable write protection on Linux kernel >= 5.3.0
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write_cr0.c
// https://medium.com/@hadfiabdelmoumene/change-value-of-wp-bit-in-cr0-when-cr0-is-panned-45a12c7e8411
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,3,0)
inline void write_cr0_new(unsigned long cr0)
{
asm volatile("mov %0,%%cr0" : "+r"(cr0), "+m"(__force_order));
}
#else
#define write_cr0_new write_cr0
#endif
#define WPOFF do { write_cr0_new(read_cr0() & (~0x10000)); } while (0);
#define WPON do { write_cr0_new(read_cr0() | 0x10000); } while (0);
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