Find the physical address of exception vector table from kernel module

Question

I have an android device - Samsung galaxy s2 with kernel version 2.6.35.14 (arm cortex a9)

I tried to find the physical address of the exception vector table. I Know

Answer 1

It is also possible to use the MMU directly (registers ATS1Cxx and PAR) to perform V=>P translation. See section B4.2.4 of the ARM ARM for the gory details.

If you use the MMU registers this way, you might need to protect against races with other uses of the registers.

This maybe accessed from any kernel driver with the following code,

 unsigned int pa;
 asm("\t mcr p15, 0, %0, c7, c8, 2\n"
     "\t isb\n"
     "\t mrc p15, 0, %0, c7, c4, 0\n" : "=r" (pa) : "0" (0xffff0000));
 printk("Vector is %x\n", pa & 0xfffff000);

The constants are correct.

• 0xffff0000 is the high vector virtual address.
• 0xfffff000 is the mask for 4k pages.

This works only on later series ARM processors such as the Cortex series.