Hello there!
I'm trying to get TLB lockdown to work. I have this small snippet:
mva = create_mva(paddr);
ldr = 0x1;
__asm__ volatile (
"mcr p15,0,%[ldr],c10,c0,0 @Write D-TLB Lockdown Register\n"
"mcr p15,0,%[mva],c8,c6,1 @Invalidate TLB entry\n"
"mcr p15,0,%[mva],c10,c1,0 @Prefetch D-TLB\n"
: // outs
: [mva] "r" (mva), [ldr] "r" (ldr) // Ins
);
However, when above code is ran, the (custom) kernel panics:
====================== MMU DATA ABORT ====================
ERROR: The kernel tried to read from a faulty address
Data Fault Status = 0x00000805
Data Fault Address = 0x81394000
Fault instruction = 0x8000bb54
******************* kernel panic ***************
It seems it is caused by the instruction that writes D-TLB Lockdown register. Anyone got a clue why that is the case?
Thanks!
