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amd64: Add a 48-bit MAXADDR constant

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Some devices (e.g., ccp(4) -- to be committed) can only access the low 48
bits of physical memory.

Reviewed by:	markj
Sponsored by:	Dell EMC Isilon
This commit is contained in:
cem 2018-01-13 17:55:22 +00:00
parent a0e4c0ae9f
commit d1b1083a47
1 changed files with 1 additions and 0 deletions
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1
sys/x86/include/bus.h
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@ -118,6 +118,7 @@
#define BUS_SPACE_MAXADDR_24BIT 0xFFFFFF
#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
#if defined(__amd64__) || defined(PAE)
#define BUS_SPACE_MAXADDR_48BIT 0xFFFFFFFFFFFFULL
#define BUS_SPACE_MAXADDR 0xFFFFFFFFFFFFFFFFULL
#else
#define BUS_SPACE_MAXADDR 0xFFFFFFFF