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Document the memory ranges within the kernel region to help with debugging

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to track down which region an address is from.

Obtained from:	ABT Systems Ltd
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Andrew Turner 2016-04-13 11:43:03 +00:00
parent 9f4d1b488f
commit 0b4890b034
1 changed files with 11 additions and 6 deletions
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17
sys/arm64/include/vmparam.h
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@ -128,14 +128,19 @@
* We use the full 48 bits for each region, however the kernel may only use
* a limited range within this space.
*
* Upper region: 0xffffffffffffffff
* 0xffff000000000000
* Upper region: 0xffffffffffffffff Top of virtual memory
*
* Hole: 0xfffeffffffffffff
* 0x0001000000000000
* 0xfffffeffffffffff End of DMAP
* 0xfffffd0000000000 Start of DMAP
*
* Lower region: 0x0000ffffffffffff
* 0x0000000000000000
* 0xffff007fffffffff End of KVA
* 0xffff000000000000 Kernel base address & start of KVA
*
* Hole: 0xfffeffffffffffff
* 0x0001000000000000
*
* Lower region: 0x0000ffffffffffff End of user address space
* 0x0000000000000000 Start of user address space
*
* We use the upper region for the kernel, and the lower region for userland.
*