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| author | Keir Fraser <keir@xen.org> | 2010-11-09 11:49:49 +0000 |
|---|---|---|
| committer | Keir Fraser <keir@xen.org> | 2010-11-09 11:49:49 +0000 |
| commit | 5a771800114c437fb857b44b3ed74f60e87979c2 (patch) | |
| tree | a9a1089b753cdfb65757b08c6406d1721d989ad3 /xen/arch/x86/x86_64/mm.c | |
| parent | e04aea7477c379e904e7520bdfa2f42284427a97 (diff) | |
| download | xen-5a771800114c437fb857b44b3ed74f60e87979c2.tar.gz xen-5a771800114c437fb857b44b3ed74f60e87979c2.tar.bz2 xen-5a771800114c437fb857b44b3ed74f60e87979c2.zip | |
x86: do away with the boot time low-memory 1:1 mapping
By doing so, we're no longer restricted to be able to place all boot
loader modules into the low 1Gb/4Gb (32-/64-bit) of memory, nor is
there a dependency anymore on where the boot loader places the
modules.
We're also no longer restricted to copy the modules into a place below
4Gb, nor to put them all together into a single piece of memory.
Further it allows even the 32-bit Dom0 kernel to be loaded anywhere in
physical memory (except if it doesn't support PAE-above-4G).
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Diffstat (limited to 'xen/arch/x86/x86_64/mm.c')
| -rw-r--r-- | xen/arch/x86/x86_64/mm.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c index 126b2c9421..883d23fa84 100644 --- a/xen/arch/x86/x86_64/mm.c +++ b/xen/arch/x86/x86_64/mm.c @@ -65,6 +65,12 @@ l3_pgentry_t __attribute__ ((__section__ (".bss.page_aligned"))) l2_pgentry_t __attribute__ ((__section__ (".bss.page_aligned"))) l2_xenmap[L2_PAGETABLE_ENTRIES]; +/* Enough page directories to map into the bottom 1GB. */ +l3_pgentry_t __attribute__ ((__section__ (".bss.page_aligned"))) + l3_bootmap[L3_PAGETABLE_ENTRIES]; +l2_pgentry_t __attribute__ ((__section__ (".bss.page_aligned"))) + l2_bootmap[L2_PAGETABLE_ENTRIES]; + int __mfn_valid(unsigned long mfn) { return likely(mfn < max_page) && |