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Add the machine-specific definitions for configuring the new physical

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memory allocator.

Set the size of phys_avail[] and dump_avail[] using one of these
definitions.

Approved by:	re
This commit is contained in:
Alan Cox 2007-06-03 23:18:29 +00:00
parent 1d558d6a15
commit 5b4a3e940f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=170253
2 changed files with 45 additions and 1 deletions
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8
sys/amd64/amd64/machdep.c
View File

@ -163,7 +163,13 @@ int cold = 1;
long Maxmem = 0;
long realmem = 0;
#define PHYSMAP_SIZE (2 * 30)
/*
* The number of PHYSMAP entries must be one less than the number of
* PHYSSEG entries because the PHYSMAP entry that spans the largest
* physical address that is accessible by ISA DMA is split into two
* PHYSSEG entries.
*/
#define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];

38
sys/amd64/include/vmparam.h
View File

@ -92,6 +92,44 @@
*/
#define VM_PHYSSEG_DENSE
/*
* The number of PHYSSEG entries must be one greater than the number
* of phys_avail entries because the phys_avail entry that spans the
* largest physical address that is accessible by ISA DMA is split
* into two PHYSSEG entries.
*/
#define VM_PHYSSEG_MAX 31
/*
* Create two free page pools: VM_FREEPOOL_DEFAULT is the default pool
* from which physical pages are allocated and VM_FREEPOOL_DIRECT is
* the pool from which physical pages for page tables and small UMA
* objects are allocated.
*/
#define VM_NFREEPOOL 2
#define VM_FREEPOOL_DEFAULT 0
#define VM_FREEPOOL_DIRECT 1
/*
* Create two free page lists: VM_FREELIST_DEFAULT is for physical
* pages that are above the largest physical address that is
* accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
* that are below that address.
*/
#define VM_NFREELIST 2
#define VM_FREELIST_DEFAULT 0
#define VM_FREELIST_ISADMA 1
/*
* An allocation size of 16MB is supported in order to optimize the
* use of the direct map by UMA. Specifically, a cache line contains
* at most 8 PDEs, collectively mapping 16MB of physical memory. By
* reducing the number of distinct 16MB "pages" that are used by UMA,
* the physical memory allocator reduces the likelihood of both 2MB
* page TLB misses and cache misses caused by 2MB page TLB misses.
*/
#define VM_NFREEORDER 13
/*
* Virtual addresses of things. Derived from the page directory and
* page table indexes from pmap.h for precision.