RISC-V: mm: Restrict address space for sv39,sv48,sv57

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Make sv48 the default address space for mmap as some applications
currently depend on this assumption. A hint address passed to mmap will
cause the largest address space that fits entirely into the hint to be
used. If the hint is less than or equal to 1<<38, an sv39 address will
be used. An exception is that if the hint address is 0, then a sv48
address will be used. After an address space is completely full, the next
smallest address space will be used.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/20230809232218.849726-2-charlie@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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Charlie Jenkins 2023-08-09 16:22:01 -07:00 • committed by Palmer Dabbelt

parent 06c2afb862

commit add2cc6b65

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3 changed files with 70 additions and 9 deletions

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2

arch/riscv/include/asm/elf.h

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25

arch/riscv/include/asm/pgtable.h

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52

arch/riscv/include/asm/processor.h

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