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Make preparations for increasing the size of the kernel virtual address space

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on the amd64 architecture.  The amd64 architecture requires kernel code and
global variables to reside in the highest 2GB of the 64-bit virtual address
space.  Thus, the memory allocated during bootstrap, before the call to
kmem_init(), starts at KERNBASE, which is not necessarily the same as
VM_MIN_KERNEL_ADDRESS on amd64.
This commit is contained in:
Alan Cox 2008-06-22 04:54:27 +00:00
parent c1f02198d1
commit 5cfa90e902
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=179923
1 changed files with 6 additions and 2 deletions
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8
sys/vm/vm_kern.c
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@ -497,8 +497,12 @@ kmem_init(start, end)
/* N.B.: cannot use kgdb to debug, starting with this assignment ... */
kernel_map = m;
(void) vm_map_insert(m, NULL, (vm_ooffset_t) 0,
VM_MIN_KERNEL_ADDRESS, start, VM_PROT_ALL, VM_PROT_ALL,
MAP_NOFAULT);
#ifdef __amd64__
KERNBASE,
#else
VM_MIN_KERNEL_ADDRESS,
#endif
start, VM_PROT_ALL, VM_PROT_ALL, MAP_NOFAULT);
/* ... and ending with the completion of the above `insert' */
vm_map_unlock(m);
}