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Since r296250 it is no longer possible for devices to use bus space

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addresses exceeding 32 bit, so bump BUS_SPACE_MAXADDR to 64 bit.
The whole situation is sub par, though; prior to r296250 and despite
what their names imply, BUS_SPACE_MAX* were primarily, even almost
exclusively used for bus_dma(9). Now these macros also have a vital
role for bus_space(9). However, it does not necessarily hold that
both bus DMA and space addresses universally have the same limits
per platform.
As for sparc64, 64 bit clearly is beyond what can be addressed via
the various IOMMUs. With this change in place, we now rely on the
parent bus DMA tags of the host-to-foo drivers causing the child
tags to be capped as necessary.

PR:		207998
This commit is contained in:
Marius Strobl 2016-04-10 22:43:36 +00:00
parent abafa4db03
commit 61a4e586d4
1 changed files with 1 additions and 1 deletions
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2
sys/sparc64/include/bus.h
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@ -98,7 +98,7 @@ extern const int bus_stream_asi[];
#define BUS_SPACE_MAXSIZE 0xFFFFFFFFFFFFFFFF
#define BUS_SPACE_MAXADDR_24BIT 0xFFFFFF
#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
#define BUS_SPACE_MAXADDR 0xFFFFFFFF
#define BUS_SPACE_MAXADDR 0xFFFFFFFFFFFFFFFF
#define BUS_SPACE_UNRESTRICTED (~0)