diff options
Diffstat (limited to 'sys/vm/vm_page.c')
| -rw-r--r-- | sys/vm/vm_page.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c index f84efa59e7a1..05123473f764 100644 --- a/sys/vm/vm_page.c +++ b/sys/vm/vm_page.c @@ -121,6 +121,8 @@ __FBSDID("$FreeBSD$"); #include <vm/uma.h> #include <vm/uma_int.h> +#include <machine/md_var.h> + /* * Associated with page of user-allocatable memory is a * page structure. @@ -232,6 +234,25 @@ vm_page_startup(vm_offset_t vaddr) bzero((void *)mapped, end - new_end); uma_startup((void *)mapped, boot_pages); +#if defined(__amd64__) || defined(__i386__) + /* + * Allocate a bitmap to indicate that a random physical page + * needs to be included in a minidump. + * + * The amd64 port needs this to indicate which direct map pages + * need to be dumped, via calls to dump_add_page()/dump_drop_page(). + * + * However, i386 still needs this workspace internally within the + * minidump code. In theory, they are not needed on i386, but are + * included should the sf_buf code decide to use them. + */ + page_range = phys_avail[(nblocks - 1) * 2 + 1] / PAGE_SIZE; + vm_page_dump_size = round_page(roundup2(page_range, NBBY) / NBBY); + new_end -= vm_page_dump_size; + vm_page_dump = (void *)(uintptr_t)pmap_map(&vaddr, new_end, + new_end + vm_page_dump_size, VM_PROT_READ | VM_PROT_WRITE); + bzero((void *)vm_page_dump, vm_page_dump_size); +#endif /* * Compute the number of pages of memory that will be available for * use (taking into account the overhead of a page structure per |