RISCV64 qemu virt board port #25
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Fixes the code that assumes that pointers and int have the same size: use uintptr_t or intptr_t instead. Introduces macroses for byte swapping of 64 bit values Allows printing of 64 bit addresses at system start and in memory status.
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Please add port to the RISC-V 64 architecture. Currently it
supports running on the emulated 'virt' machine.
It works with RISC-V project's GNU compiler toolchain
https://github.com/riscv/riscv-gnu-toolchain
on riscv qemu https://github.com/riscv/riscv-qemu.
Currently only serial device and basic functionality supported,
All the relevant the tests in the testsuite pass..
This PR depends on my previous PRs for 64 bit and DTB support.