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The Xen target was completely ignored when porting the biosmem and
vm_page physical memory allocators. Let's fix this.
* i386/Makefrag.am (libkernel_a_SOURCES): Add i386/i386at/biosmem.{c,h}.
* i386/i386/vm_page.h (VM_PAGE_MAX_SEGS, VM_PAGE_DIRECTMAP_LIMIT,
VM_PAGE_HIGHMEM_LIMIT): Define for Xen.
* i386/i386at/biosmem.c: Include mach/xen.h.
(biosmem_panic_setup_msg): Comment out for Xen since it's unused.
(biosmem_map_build, biosmem_map_build_simple,
biosmem_save_cmdline_sizes, biosmem_find_boot_data_update,
biosmem_find_boot_data, biosmem_setup_allocator): Likewise.
(biosmem_bootstrap_common): New function.
(biosmem_xen_bootstrap): Likewise, for Xen.
(biosmem_bootalloc): Perform bottom-up allocations for Xen.
* i386/i386at/biosmem.h (biosmem_xen_bootstrap): New prototype, for Xen.
* i386/i386at/model_dep.c (i386at_init): Call biosmem_xen_bootstrap instead
of biosmem_bootstrap on Xen.
* i386/include/mach/i386/vm_types.h (phys_addr_t): Define as an unsigned
64-bits integer when PAE is enabled.
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