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Make preparations for increasing the size of the kernel virtual

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address space 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, KERNBASE cannot change.
However, KERNBASE is sometimes used as the start of the kernel virtual
address space.  Henceforth, VM_MIN_KERNEL_ADDRESS should be used
instead.  Since KERNBASE and VM_MIN_KERNEL_ADDRESS are still the same
address, there should be no visible effect from this change (yet).
That said, kris@ has tested crash dumps under the full patch that
increases the kernel virtual address space on amd64 to 6GB.

Tested by: kris@
This commit is contained in:
Alan Cox 2008-06-20 20:59:31 +00:00
parent 7e7a4e1d18
commit 948c5cc27e
1 changed files with 3 additions and 3 deletions
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6
sys/amd64/amd64/minidump_machdep.c
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@ -206,7 +206,7 @@ minidumpsys(struct dumperinfo *di)
/* Walk page table pages, set bits in vm_page_dump */
ptesize = 0;
pdp = (uint64_t *)PHYS_TO_DMAP(KPDPphys);
for (va = KERNBASE; va < kernel_vm_end; va += NBPDR) {
for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += NBPDR) {
i = (va >> PDPSHIFT) & ((1ul << NPDPEPGSHIFT) - 1);
/*
* We always write a page, even if it is zero. Each
@ -278,7 +278,7 @@ minidumpsys(struct dumperinfo *di)
mdhdr.msgbufsize = msgbufp->msg_size;
mdhdr.bitmapsize = vm_page_dump_size;
mdhdr.ptesize = ptesize;
mdhdr.kernbase = KERNBASE;
mdhdr.kernbase = VM_MIN_KERNEL_ADDRESS;
mdhdr.dmapbase = DMAP_MIN_ADDRESS;
mdhdr.dmapend = DMAP_MAX_ADDRESS;
@ -312,7 +312,7 @@ minidumpsys(struct dumperinfo *di)
/* Dump kernel page table pages */
pdp = (uint64_t *)PHYS_TO_DMAP(KPDPphys);
for (va = KERNBASE; va < kernel_vm_end; va += NBPDR) {
for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += NBPDR) {
i = (va >> PDPSHIFT) & ((1ul << NPDPEPGSHIFT) - 1);
/* We always write a page, even if it is zero */
if ((pdp[i] & PG_V) == 0) {