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diff --git a/sys/arm64/arm64/pmap.c b/sys/arm64/arm64/pmap.c
--- a/sys/arm64/arm64/pmap.c
+++ b/sys/arm64/arm64/pmap.c
@@ -1332,6 +1332,7 @@
{
vm_offset_t dpcpu, msgbufpv;
vm_paddr_t start_pa, pa;
+ size_t largest_phys_size;
/* Set this early so we can use the pagetable walking functions */
kernel_pmap_store.pm_l0 = pagetable_l0_ttbr1;
@@ -1346,12 +1347,34 @@
kernel_pmap->pm_ttbr = kernel_pmap->pm_l0_paddr;
kernel_pmap->pm_asid_set = &asids;
+ /* Reserve some VA space for early BIOS/ACPI mapping */
+ preinit_map_va = roundup2(bs_state.freemempos, L2_SIZE);
+
+ virtual_avail = preinit_map_va + PMAP_PREINIT_MAPPING_SIZE;
+ virtual_avail = roundup2(virtual_avail, L1_SIZE);
+ virtual_end = VM_MAX_KERNEL_ADDRESS - PMAP_MAPDEV_EARLY_SIZE;
+ kernel_vm_end = virtual_avail;
+
/*
* We only use PXN when we know nothing will be executed from it, e.g.
* the DMAP region.
*/
bs_state.table_attrs &= ~TATTR_PXN_TABLE;
+ /* Update the physmap array. */
+ physmap_idx = physmem_avail(physmap, nitems(physmap));
+
+ /*
+ * Find the minimum physical address and largest region.
+ */
+ largest_phys_size = 0;
+ for (int i = 0; i < physmap_idx; i += 2) {
+ if ((physmap[i + 1] - physmap[i]) > largest_phys_size) {
+ largest_phys_size = physmap[i + 1] - physmap[i];
+ bs_state.freemempos = PHYS_TO_DMAP(physmap[i]);
+ }
+ }
+
start_pa = pmap_early_vtophys(bs_state.freemempos);
/*
@@ -1378,19 +1401,9 @@
alloc_pages(msgbufpv, round_page(msgbufsize) / PAGE_SIZE);
msgbufp = (void *)msgbufpv;
- /* Reserve some VA space for early BIOS/ACPI mapping */
- preinit_map_va = roundup2(bs_state.freemempos, L2_SIZE);
-
- virtual_avail = preinit_map_va + PMAP_PREINIT_MAPPING_SIZE;
- virtual_avail = roundup2(virtual_avail, L1_SIZE);
- virtual_end = VM_MAX_KERNEL_ADDRESS - (PMAP_MAPDEV_EARLY_SIZE);
- kernel_vm_end = virtual_avail;
-
pa = pmap_early_vtophys(bs_state.freemempos);
physmem_exclude_region(start_pa, pa - start_pa, EXFLAG_NOALLOC);
-
- cpu_tlb_flushID();
}
#if defined(KASAN) || defined(KMSAN)

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