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Correct and extend comments on VA for alpha. No binary changes.

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rin 2020-12-16 01:20:19 +00:00
parent 6357e11169
commit 33bbc93266
1 changed files with 8 additions and 1 deletions
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9
external/bsd/jemalloc/include/jemalloc/internal/jemalloc_internal_defs.h vendored
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@ -48,7 +48,14 @@
#ifdef _LP64
/* XXX: I will take care of this later */
# ifdef __alpha__
# define LG_VADDR 43 /* bit 42 indicates direct map, 42--63 are same */
/*
* Bit 42 indicates kernel space. Bits 42--63 must be same. For user space,
* VA can be regarded to have 43 significant bits with sign-extension to
* 64 bits. ``Negative'' addresses are not used in this case. Alternatively,
* VA can also be regarded to have 42 significant bits with zero-extension.
* See rtree_leaf_elm_bits_extent_get() in rtree.h for more details.
*/
# define LG_VADDR 43
# else
# define LG_VADDR 48
# endif