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bd3982b630
Allow code using the combined MMIO and port I/O accessors to safely call iounmap() to unmap the MMIO or port I/O region. In the virtual offset I/O mapping API as used for UEFI, 32-bit BIOS, and 32-bit RISC-V SBI, iounmap() is a no-op anyway. In 64-bit RISC-V SBI, we have no concept of port I/O and so the issue is moot. This leaves only 64-bit BIOS, where it suffices to simply do nothing for any pages outside of the chosen MMIO virtual address range. For symmetry, we implement the equivalent change in the very closely related RISC-V page management code. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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