riscv: Allow NOMMU kernels to access all of RAM

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[ Upstream commit 2c0391b29b ]

NOMMU kernels currently cannot access memory below the kernel link
address. Remove this restriction by setting PAGE_OFFSET to the actual
start of RAM, as determined from the devicetree. The kernel link address
must be a constant, so keep using CONFIG_PAGE_OFFSET for that purpose.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Jesse Taube <mr.bossman075@gmail.com>
Link: https://lore.kernel.org/r/20241026171441.3047904-3-samuel.holland@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Samuel Holland 2024-10-26 10:13:54 -07:00 • committed by Greg Kroah-Hartman

parent 09096ead92

commit bbf3bb6dde

2 changed files with 5 additions and 9 deletions

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12

arch/riscv/include/asm/page.h

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2

arch/riscv/include/asm/pgtable.h

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