Hello,
sri wrote:
I am a newbie to kernel ..
I am using a hardware debugger to debug the kernel start-up code for 2.4.18
kernel for which i have been setting a break point at the 0xffff0200 address
location which i believe is the vector base address+0x24 (__trap_init+0x24
address location ).
Now i have moved to 2.4.20 kernel for which the above break
point is not working.. I could get the virtual address of this location from
System.map file but not clear how to get the physical address..
On which architecture are you running ?
If it's x86 (but I don't think it is) with the default configuration (4G
address space, 3G/1G split), then kernel virtual addresses are directly
mapped to physical addresses with a 3G offset. So the formula to compute
a physical address from a kernel virtual address is :
physical = virtual - 3G
For other architectures, this may be different, in particular for
architecture that have fixed address interrupt vectors.
Sincerly,
Thomas
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Thomas Petazzoni
thomas.petazzoni@xxxxxxxx
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