riscv: add ZONE_DMA32

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This patch allows devices that require memory that can be addressed
using 32-bit addresses to work easily on RISC-V systems.  The newly
improved dma-direct ops will tap into this pool automatically for
32-bit addressing.

Based on an earlier patch from Wesley W. Terpstra.

CC: Wesley W. Terpstra <terpstra@sifive.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

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Christoph Hellwig 2018-01-16 09:37:50 +01:00 • committed by Palmer Dabbelt

parent f1b65f20fb

commit 5ec9c4ff04

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3 changed files with 20 additions and 4 deletions

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5

arch/riscv/Kconfig

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9

arch/riscv/kernel/setup.c

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10

arch/riscv/mm/init.c

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