Hi everyone,
I am working on developing the simulation of a system that contains two
different regions of memory. One that maps to the cachable system memory
(including cache hierarchy) but another region that is non-cachable, and which
goes to a different memory (similar to scratchpad memory for the sake of this
question). Additionally, in the executing code, I am trying to allocate some
objects into this scratchpad memory address space from a section in the elf
file. While running in SE mode. So, for example:
System Memory address range -> 0x-00000 to 0x00FFF
Scratchpad memory address range -> 0x01000 to 0xFFFFF
And in the linker script I place some sections in this region like:
. = 0x1000
.scratchpad {
/* all symbols */
}
Then to use the __attribute__((section(“.scratchpad”)) in a given definition.
However, when the loader loads this elf file, the virtual memory is assigned
correctly, but it is mapped to another physical memory range that is different
to the physical memory of the SPmem device.
I know I can use the .map() method in the process like this (in python)
process.map(Addr(args.mem_size),
Addr(args.mem_size),
SPMemorySize,
False)
This will only work if I don’t use sections in the linker script, and instead,
manually assign the value of a pointer. (e.g. int *a = (int*) 0x1000;)
But when I run it with the elf sections I get the error:
build/RISCV/mem/page_table.cc:60: panic: panic condition !clobber occurred:
EmulationPageTable::allocate: addr 0xc0000000 already mapped
Because by the moment I reach the second map, the loader has already mapped the
region before.
I would appreciate if someone can share nay pointers on how to properly do this
mapping between virt and physical.
Thanks!
Jose M Monsalve Diaz
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