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loader: create bio_alloc and bio_free for bios bounce buffer

Description

loader: create bio_alloc and bio_free for bios bounce buffer

We do have 16KB buffer space defined in pxe.c, move it to bio.c and implement
bio_alloc()/bio_free() interface to make it possible to use this space for
other BIOS calls (notably, from biosdisk.c).

MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D17131

Details

Committed
tsoomeDec 30 2018, 9:35 AM
Differential Revision
D17131: loader: create bio_alloc and bio_free for bios bounce buffer
Parents
rS342618: MFC r342151, r342161:
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