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| author | alc <alc@FreeBSD.org> | 2007-05-05 19:50:28 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2007-05-05 19:50:28 +0000 |
| commit | b34f6f7ab1b2b31d561cfbfbc0b43a23c6d93a3e (patch) | |
| tree | 7aa0cbd313dfa6ace4e0a35a84679f7d3492a165 /sys/i386/include/vmparam.h | |
| parent | 5326cfc8d7152339e4530123781c6ad0d0a22261 (diff) | |
| download | FreeBSD-src-b34f6f7ab1b2b31d561cfbfbc0b43a23c6d93a3e.zip FreeBSD-src-b34f6f7ab1b2b31d561cfbfbc0b43a23c6d93a3e.tar.gz | |
Define every architecture as either VM_PHYSSEG_DENSE or
VM_PHYSSEG_SPARSE depending on whether the physical address space is
densely or sparsely populated with memory. The effect of this
definition is to determine which of two implementations of
vm_page_array and PHYS_TO_VM_PAGE() is used. The legacy
implementation is obtained by defining VM_PHYSSEG_DENSE, and a new
implementation that trades off time for space is obtained by defining
VM_PHYSSEG_SPARSE. For now, all architectures except for ia64 and
sparc64 define VM_PHYSSEG_DENSE. Defining VM_PHYSSEG_SPARSE on ia64
allows the entirety of my Itanium 2's memory to be used. Previously,
only the first 1 GB could be used. Defining VM_PHYSSEG_SPARSE on
sparc64 allows USIIIi-based systems to boot without crashing.
This change is a combination of Nathan Whitehorn's patch and my own
work in perforce.
Discussed with: kmacy, marius, Nathan Whitehorn
PR: 112194
Diffstat (limited to 'sys/i386/include/vmparam.h')
| -rw-r--r-- | sys/i386/include/vmparam.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sys/i386/include/vmparam.h b/sys/i386/include/vmparam.h index 042470e..24765d3 100644 --- a/sys/i386/include/vmparam.h +++ b/sys/i386/include/vmparam.h @@ -82,6 +82,11 @@ /* + * The physical address space is densely populated. + */ +#define VM_PHYSSEG_DENSE + +/* * Kernel physical load address. */ #ifndef KERNLOAD |
