diff options
| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2012-03-23 00:15:42 +0100 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2012-03-23 00:15:42 +0100 |
| commit | d87d897ae7890ed7a58ec65c0c60a2258747e3c1 (patch) | |
| tree | c875529d136c3322175c301f300dc43167ba2a6c /i386/i386at/model_dep.c | |
| parent | 809f7720aa0c1704e821ce31b147765c9676f0e6 (diff) | |
Fix boot with big values of _start
When _start is not close to 0, just using init_alloc_aligned() is not enough
to know how much should be duplicated between linear and virtual mappings.
Just mapping everything that can be is not very costly and should just work
when it can work.
* i386/i386at/model_dep.c (i386at_init) [VM_MIN_KERNEL_ADDRESS !=
LINEAR_MIN_KERNEL_ADDRESS]: Extend `nb_direct' to VM_MIN_KERNEL_ADDRESS -
LINEAR_MIN_KERNEL_ADDRESS.
Diffstat (limited to 'i386/i386at/model_dep.c')
| -rw-r--r-- | i386/i386at/model_dep.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/i386/i386at/model_dep.c b/i386/i386at/model_dep.c index 1fc1bf9c..ef2d672a 100644 --- a/i386/i386at/model_dep.c +++ b/i386/i386at/model_dep.c @@ -319,7 +319,7 @@ i386at_init(void) /* XXX move to intel/pmap.h */ extern pt_entry_t *kernel_page_dir; int nb_direct, i; - vm_offset_t addr; + vm_offset_t addr, delta; /* * Initialize the PIC prior to any possible call to an spl. @@ -389,8 +389,10 @@ i386at_init(void) * page-level write protection works in kernel mode. */ #if VM_MIN_KERNEL_ADDRESS != LINEAR_MIN_KERNEL_ADDRESS - init_alloc_aligned(0, &addr); - nb_direct = (addr + NPTES * PAGE_SIZE - 1) / (NPTES * PAGE_SIZE); + delta = VM_MIN_KERNEL_ADDRESS - LINEAR_MIN_KERNEL_ADDRESS; + if ((vm_offset_t)(-delta) < delta) + delta = (vm_offset_t)(-delta); + nb_direct = delta >> PDESHIFT; for (i = 0; i < nb_direct; i++) kernel_page_dir[lin2pdenum(VM_MIN_KERNEL_ADDRESS) + i] = kernel_page_dir[lin2pdenum(LINEAR_MIN_KERNEL_ADDRESS) + i]; |