diff --git a/sys/amd64/acpica/acpi_machdep.c b/sys/amd64/acpica/acpi_machdep.c
--- a/sys/amd64/acpica/acpi_machdep.c
+++ b/sys/amd64/acpica/acpi_machdep.c
@@ -103,17 +103,17 @@
 
 	header = pmap_mapbios(pa, sizeof(ACPI_TABLE_HEADER));
 	if (strncmp(header->Signature, sig, ACPI_NAMESEG_SIZE) != 0) {
-		pmap_unmapbios((vm_offset_t)header, sizeof(ACPI_TABLE_HEADER));
+		pmap_unmapbios(header, sizeof(ACPI_TABLE_HEADER));
 		return (NULL);
 	}
 	length = header->Length;
-	pmap_unmapbios((vm_offset_t)header, sizeof(ACPI_TABLE_HEADER));
+	pmap_unmapbios(header, sizeof(ACPI_TABLE_HEADER));
 	table = pmap_mapbios(pa, length);
 	if (ACPI_FAILURE(AcpiTbChecksum(table, length))) {
 		if (bootverbose)
 			printf("ACPI: Failed checksum for table %s\n", sig);
 #if (ACPI_CHECKSUM_ABORT)
-		pmap_unmapbios((vm_offset_t)table, length);
+		pmap_unmapbios(table, length);
 		return (NULL);
 #endif
 	}
@@ -132,7 +132,7 @@
 
 	table = pmap_mapbios(address, sizeof(ACPI_TABLE_HEADER));
 	ret = strncmp(table->Signature, sig, ACPI_NAMESEG_SIZE) == 0;
-	pmap_unmapbios((vm_offset_t)table, sizeof(ACPI_TABLE_HEADER));
+	pmap_unmapbios(table, sizeof(ACPI_TABLE_HEADER));
 	return (ret);
 }
 
@@ -154,7 +154,7 @@
 	ACPI_TABLE_HEADER *header;
 
 	header = (ACPI_TABLE_HEADER *)table;
-	pmap_unmapbios((vm_offset_t)table, header->Length);
+	pmap_unmapbios(table, header->Length);
 }
 
 /*
@@ -235,7 +235,7 @@
 			}
 		acpi_unmap_table(rsdt);
 	}
-	pmap_unmapbios((vm_offset_t)rsdp, sizeof(ACPI_TABLE_RSDP));
+	pmap_unmapbios(rsdp, sizeof(ACPI_TABLE_RSDP));
 	if (addr == 0)
 		return (0);
 
diff --git a/sys/amd64/amd64/mem.c b/sys/amd64/amd64/mem.c
--- a/sys/amd64/amd64/mem.c
+++ b/sys/amd64/amd64/mem.c
@@ -148,7 +148,7 @@
 			}
 			p = pmap_mapdev(v, PAGE_SIZE);
 			error = uiomove(p, c, uio);
-			pmap_unmapdev((vm_offset_t)p, PAGE_SIZE);
+			pmap_unmapdev(p, PAGE_SIZE);
 			break;
 		}
 	}
diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -9295,12 +9295,14 @@
 }
 
 void
-pmap_unmapdev(vm_offset_t va, vm_size_t size)
+pmap_unmapdev(void *p, vm_size_t size)
 {
 	struct pmap_preinit_mapping *ppim;
-	vm_offset_t offset;
+	vm_offset_t offset, va;
 	int i;
 
+	va = (vm_offset_t)p;
+
 	/* If we gave a direct map region in pmap_mapdev, do nothing */
 	if (va >= DMAP_MIN_ADDRESS && va < DMAP_MAX_ADDRESS)
 		return;
diff --git a/sys/amd64/include/pmap.h b/sys/amd64/include/pmap.h
--- a/sys/amd64/include/pmap.h
+++ b/sys/amd64/include/pmap.h
@@ -508,7 +508,7 @@
 void	pmap_pinit_pml4(vm_page_t);
 void	pmap_pinit_pml5(vm_page_t);
 bool	pmap_ps_enabled(pmap_t pmap);
-void	pmap_unmapdev(vm_offset_t, vm_size_t);
+void	pmap_unmapdev(void *, vm_size_t);
 void	pmap_invalidate_page(pmap_t, vm_offset_t);
 void	pmap_invalidate_range(pmap_t, vm_offset_t, vm_offset_t);
 void	pmap_invalidate_all(pmap_t);
diff --git a/sys/arm/arm/bus_space_generic.c b/sys/arm/arm/bus_space_generic.c
--- a/sys/arm/arm/bus_space_generic.c
+++ b/sys/arm/arm/bus_space_generic.c
@@ -95,7 +95,7 @@
 generic_bs_unmap(bus_space_tag_t t, bus_space_handle_t h, bus_size_t size)
 {
 
-	pmap_unmapdev((vm_offset_t)h, size);
+	pmap_unmapdev((void *)h, size);
 }
 
 void
diff --git a/sys/arm/arm/nexus.c b/sys/arm/arm/nexus.c
--- a/sys/arm/arm/nexus.c
+++ b/sys/arm/arm/nexus.c
@@ -399,7 +399,7 @@
 #ifdef FDT
 			bus_space_unmap(fdtbus_bs_tag, vaddr, psize);
 #else
-			pmap_unmapdev((vm_offset_t)vaddr, (vm_size_t)psize);
+			pmap_unmapdev((void *)vaddr, (vm_size_t)psize);
 #endif
 			rman_set_virtual(r, NULL);
 			rman_set_bushandle(r, 0);
diff --git a/sys/arm/broadcom/bcm2835/bcm2835_fbd.c b/sys/arm/broadcom/bcm2835/bcm2835_fbd.c
--- a/sys/arm/broadcom/bcm2835/bcm2835_fbd.c
+++ b/sys/arm/broadcom/bcm2835/bcm2835_fbd.c
@@ -152,12 +152,12 @@
 	fbd = device_add_child(sc->dev, "fbd", device_get_unit(sc->dev));
 	if (fbd == NULL) {
 		device_printf(sc->dev, "Failed to add fbd child\n");
-		pmap_unmapdev(sc->info.fb_vbase, sc->info.fb_size);
+		pmap_unmapdev((void *)sc->info.fb_vbase, sc->info.fb_size);
 		return (ENXIO);
 	} else if (device_probe_and_attach(fbd) != 0) {
 		device_printf(sc->dev, "Failed to attach fbd device\n");
 		device_delete_child(sc->dev, fbd);
-		pmap_unmapdev(sc->info.fb_vbase, sc->info.fb_size);
+		pmap_unmapdev((void *)sc->info.fb_vbase, sc->info.fb_size);
 		return (ENXIO);
 	}
 
diff --git a/sys/arm/freescale/fsl_ocotp.c b/sys/arm/freescale/fsl_ocotp.c
--- a/sys/arm/freescale/fsl_ocotp.c
+++ b/sys/arm/freescale/fsl_ocotp.c
@@ -135,7 +135,7 @@
 
 	/* We're done with the temporary mapping now. */
 	if (ocotp_regs != NULL)
-		pmap_unmapdev((vm_offset_t)ocotp_regs, ocotp_size);
+		pmap_unmapdev(ocotp_regs, ocotp_size);
 
 	err = 0;
 
diff --git a/sys/arm/include/pmap.h b/sys/arm/include/pmap.h
--- a/sys/arm/include/pmap.h
+++ b/sys/arm/include/pmap.h
@@ -47,7 +47,7 @@
 void pmap_page_set_memattr(vm_page_t, vm_memattr_t);
 
 void *pmap_mapdev(vm_paddr_t, vm_size_t);
-void pmap_unmapdev(vm_offset_t, vm_size_t);
+void pmap_unmapdev(void *, vm_size_t);
 
 static inline void *
 pmap_mapdev_attr(vm_paddr_t addr, vm_size_t size, int attr)
diff --git a/sys/arm/mv/armadaxp/armadaxp_mp.c b/sys/arm/mv/armadaxp/armadaxp_mp.c
--- a/sys/arm/mv/armadaxp/armadaxp_mp.c
+++ b/sys/arm/mv/armadaxp/armadaxp_mp.c
@@ -121,7 +121,7 @@
 	    src++, dst++) {
 		*dst = *src;
 	}
-	pmap_unmapdev((vm_offset_t)dst, PAGE_SIZE);
+	pmap_unmapdev(dst, PAGE_SIZE);
 	if (cputype == CPU_ID_MV88SV584X_V7) {
 		/* Core rev A0 */
 		div_val = read_cpu_clkdiv(CPU_DIVCLK_CTRL2_RATIO_FULL1);
diff --git a/sys/arm64/acpica/acpi_machdep.c b/sys/arm64/acpica/acpi_machdep.c
--- a/sys/arm64/acpica/acpi_machdep.c
+++ b/sys/arm64/acpica/acpi_machdep.c
@@ -71,11 +71,11 @@
 
 	header = pmap_mapbios(pa, sizeof(ACPI_TABLE_HEADER));
 	if (strncmp(header->Signature, sig, ACPI_NAMESEG_SIZE) != 0) {
-		pmap_unmapbios((vm_offset_t)header, sizeof(ACPI_TABLE_HEADER));
+		pmap_unmapbios(header, sizeof(ACPI_TABLE_HEADER));
 		return (NULL);
 	}
 	length = header->Length;
-	pmap_unmapbios((vm_offset_t)header, sizeof(ACPI_TABLE_HEADER));
+	pmap_unmapbios(header, sizeof(ACPI_TABLE_HEADER));
 
 	table = pmap_mapbios(pa, length);
 	if (ACPI_FAILURE(AcpiTbChecksum(table, length))) {
@@ -107,10 +107,10 @@
 	}
 
 	if (strncmp(table->Signature, sig, ACPI_NAMESEG_SIZE) != 0) {
-		pmap_unmapbios((vm_offset_t)table, sizeof(ACPI_TABLE_HEADER));
+		pmap_unmapbios(table, sizeof(ACPI_TABLE_HEADER));
 		return (0);
 	}
-	pmap_unmapbios((vm_offset_t)table, sizeof(ACPI_TABLE_HEADER));
+	pmap_unmapbios(table, sizeof(ACPI_TABLE_HEADER));
 	return (1);
 }
 
@@ -121,7 +121,7 @@
 	ACPI_TABLE_HEADER *header;
 
 	header = (ACPI_TABLE_HEADER *)table;
-	pmap_unmapbios((vm_offset_t)table, header->Length);
+	pmap_unmapbios(table, header->Length);
 }
 
 /*
@@ -182,8 +182,7 @@
 		if (xsdt == NULL) {
 			if (bootverbose)
 				printf("ACPI: Failed to map XSDT\n");
-			pmap_unmapbios((vm_offset_t)rsdp,
-			    sizeof(ACPI_TABLE_RSDP));
+			pmap_unmapbios(rsdp, sizeof(ACPI_TABLE_RSDP));
 			return (0);
 		}
 		count = (xsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) /
@@ -195,7 +194,7 @@
 			}
 		acpi_unmap_table(xsdt);
 	}
-	pmap_unmapbios((vm_offset_t)rsdp, sizeof(ACPI_TABLE_RSDP));
+	pmap_unmapbios(rsdp, sizeof(ACPI_TABLE_RSDP));
 
 	if (addr == 0)
 		return (0);
diff --git a/sys/arm64/arm64/bus_machdep.c b/sys/arm64/arm64/bus_machdep.c
--- a/sys/arm64/arm64/bus_machdep.c
+++ b/sys/arm64/arm64/bus_machdep.c
@@ -116,7 +116,7 @@
 generic_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
 {
 
-	pmap_unmapdev(bsh, size);
+	pmap_unmapdev((void *)bsh, size);
 }
 
 static void
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
@@ -6097,15 +6097,16 @@
 }
 
 void
-pmap_unmapbios(vm_offset_t va, vm_size_t size)
+pmap_unmapbios(void *p, vm_size_t size)
 {
 	struct pmap_preinit_mapping *ppim;
-	vm_offset_t offset, tmpsize, va_trunc;
+	vm_offset_t offset, tmpsize, va, va_trunc;
 	pd_entry_t *pde;
 	pt_entry_t *l2;
 	int i, lvl, l2_blocks, block;
 	bool preinit_map;
 
+	va = (vm_offset_t)p;
 	l2_blocks =
 	   (roundup2(va + size, L2_SIZE) - rounddown2(va, L2_SIZE)) >> L2_SHIFT;
 	KASSERT(l2_blocks > 0, ("pmap_unmapbios: invalid size %lx", size));
diff --git a/sys/arm64/include/pmap.h b/sys/arm64/include/pmap.h
--- a/sys/arm64/include/pmap.h
+++ b/sys/arm64/include/pmap.h
@@ -192,8 +192,8 @@
 
 void	*pmap_mapdev(vm_paddr_t, vm_size_t);
 void	*pmap_mapbios(vm_paddr_t, vm_size_t);
-void	pmap_unmapdev(vm_offset_t, vm_size_t);
-void	pmap_unmapbios(vm_offset_t, vm_size_t);
+void	pmap_unmapdev(void *, vm_size_t);
+void	pmap_unmapbios(void *, vm_size_t);
 
 boolean_t pmap_map_io_transient(vm_page_t *, vm_offset_t *, int, boolean_t);
 void	pmap_unmap_io_transient(vm_page_t *, vm_offset_t *, int, boolean_t);
diff --git a/sys/compat/linuxkpi/common/src/linux_compat.c b/sys/compat/linuxkpi/common/src/linux_compat.c
--- a/sys/compat/linuxkpi/common/src/linux_compat.c
+++ b/sys/compat/linuxkpi/common/src/linux_compat.c
@@ -1976,7 +1976,7 @@
 	if (vmmap == NULL)
 		return;
 #if defined(__i386__) || defined(__amd64__) || defined(__powerpc__) || defined(__aarch64__) || defined(__riscv)
-	pmap_unmapdev((vm_offset_t)addr, vmmap->vm_size);
+	pmap_unmapdev(addr, vmmap->vm_size);
 #endif
 	kfree(vmmap);
 }
diff --git a/sys/compat/x86bios/x86bios.c b/sys/compat/x86bios/x86bios.c
--- a/sys/compat/x86bios/x86bios.c
+++ b/sys/compat/x86bios/x86bios.c
@@ -662,14 +662,14 @@
 	}
 	if (x86bios_ivt != NULL) {
 #ifdef X86BIOS_NATIVE_ARCH
-		pmap_unmapbios((vm_offset_t)x86bios_ivt, X86BIOS_IVT_SIZE);
+		pmap_unmapbios(x86bios_ivt, X86BIOS_IVT_SIZE);
 #else
 		free(x86bios_ivt, M_DEVBUF);
 		x86bios_ivt = NULL;
 #endif
 	}
 	if (x86bios_rom != NULL)
-		pmap_unmapdev((vm_offset_t)x86bios_rom, X86BIOS_ROM_SIZE);
+		pmap_unmapdev(x86bios_rom, X86BIOS_ROM_SIZE);
 	if (x86bios_seg != NULL) {
 		contigfree(x86bios_seg, X86BIOS_SEG_SIZE, M_DEVBUF);
 		x86bios_seg = NULL;
diff --git a/sys/dev/acpica/Osd/OsdMemory.c b/sys/dev/acpica/Osd/OsdMemory.c
--- a/sys/dev/acpica/Osd/OsdMemory.c
+++ b/sys/dev/acpica/Osd/OsdMemory.c
@@ -63,7 +63,7 @@
 void
 AcpiOsUnmapMemory(void *LogicalAddress, ACPI_SIZE Length)
 {
-    pmap_unmapbios((vm_offset_t)LogicalAddress, Length);
+    pmap_unmapbios(LogicalAddress, Length);
 }
 
 ACPI_STATUS
@@ -110,7 +110,7 @@
 	break;
     }
 
-    pmap_unmapdev((vm_offset_t)LogicalAddress, Width / 8);
+    pmap_unmapdev(LogicalAddress, Width / 8);
 
     return (AE_OK);
 }
@@ -139,7 +139,7 @@
 	break;
     }
 
-    pmap_unmapdev((vm_offset_t)LogicalAddress, Width / 8);
+    pmap_unmapdev(LogicalAddress, Width / 8);
 
     return (AE_OK);
 }
diff --git a/sys/dev/acpica/acpi_apei.c b/sys/dev/acpica/acpi_apei.c
--- a/sys/dev/acpica/acpi_apei.c
+++ b/sys/dev/acpica/acpi_apei.c
@@ -787,8 +787,7 @@
 			free(ge->copybuf, M_DEVBUF);
 		}
 		if (ge->buf) {
-			pmap_unmapdev((vm_offset_t)ge->buf,
-			    ge->v1.ErrorBlockLength);
+			pmap_unmapdev(ge->buf, ge->v1.ErrorBlockLength);
 		}
 		free(ge, M_DEVBUF);
 	}
diff --git a/sys/dev/acpica/acpi_pxm.c b/sys/dev/acpica/acpi_pxm.c
--- a/sys/dev/acpica/acpi_pxm.c
+++ b/sys/dev/acpica/acpi_pxm.c
@@ -666,7 +666,7 @@
 			    pc->pc_domain);
 	}
 	/* XXXMJ the page is leaked. */
-	pmap_unmapbios((vm_offset_t)cpus, sizeof(*cpus) * max_cpus);
+	pmap_unmapbios(cpus, sizeof(*cpus) * max_cpus);
 	srat_physaddr = 0;
 	cpus = NULL;
 }
diff --git a/sys/dev/cesa/cesa.h b/sys/dev/cesa/cesa.h
--- a/sys/dev/cesa/cesa.h
+++ b/sys/dev/cesa/cesa.h
@@ -259,7 +259,7 @@
 
 	/* CESA SRAM Address */
 	bus_addr_t			sc_sram_base_pa;
-	vm_offset_t			sc_sram_base_va;
+	void				*sc_sram_base_va;
 	bus_size_t			sc_sram_size;
 };
 
diff --git a/sys/dev/cesa/cesa.c b/sys/dev/cesa/cesa.c
--- a/sys/dev/cesa/cesa.c
+++ b/sys/dev/cesa/cesa.c
@@ -962,7 +962,7 @@
 	sram_va = pmap_mapdev(sc->sc_sram_base_pa, sc->sc_sram_size);
 	if (sram_va == NULL)
 		return (ENOMEM);
-	sc->sc_sram_base_va = (vm_offset_t)sram_va;
+	sc->sc_sram_base_va = sram_va;
 
 	return (0);
 }
@@ -1072,7 +1072,7 @@
 	sram_va = pmap_mapdev(sc->sc_sram_base_pa, sc->sc_sram_size);
 	if (sram_va == NULL)
 		return (ENOMEM);
-	sc->sc_sram_base_va = (vm_offset_t)sram_va;
+	sc->sc_sram_base_va = sram_va;
 
 	return (0);
 }
diff --git a/sys/dev/drm2/drm_memory.c b/sys/dev/drm2/drm_memory.c
--- a/sys/dev/drm2/drm_memory.c
+++ b/sys/dev/drm2/drm_memory.c
@@ -129,6 +129,6 @@
 	    dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
 		vunmap(map->handle);
 	else
-		pmap_unmapdev((vm_offset_t)map->handle, map->size);
+		pmap_unmapdev(map->handle, map->size);
 }
 EXPORT_SYMBOL(drm_core_ioremapfree);
diff --git a/sys/dev/drm2/ttm/ttm_bo_util.c b/sys/dev/drm2/ttm/ttm_bo_util.c
--- a/sys/dev/drm2/ttm/ttm_bo_util.c
+++ b/sys/dev/drm2/ttm/ttm_bo_util.c
@@ -224,7 +224,7 @@
 	man = &bdev->man[mem->mem_type];
 
 	if (virtual && mem->bus.addr == NULL)
-		pmap_unmapdev((vm_offset_t)virtual, mem->bus.size);
+		pmap_unmapdev(virtual, mem->bus.size);
 	(void) ttm_mem_io_lock(man, false);
 	ttm_mem_io_free(bdev, mem);
 	ttm_mem_io_unlock(man);
@@ -263,7 +263,7 @@
 
 	memcpy(dst, src, PAGE_SIZE);
 
-	pmap_unmapdev((vm_offset_t)dst, PAGE_SIZE);
+	pmap_unmapdev(dst, PAGE_SIZE);
 
 	return 0;
 }
@@ -285,7 +285,7 @@
 
 	memcpy(dst, src, PAGE_SIZE);
 
-	pmap_unmapdev((vm_offset_t)src, PAGE_SIZE);
+	pmap_unmapdev(src, PAGE_SIZE);
 
 	return 0;
 }
@@ -570,7 +570,7 @@
 		return;
 	switch (map->bo_kmap_type) {
 	case ttm_bo_map_iomap:
-		pmap_unmapdev((vm_offset_t)map->virtual, map->size);
+		pmap_unmapdev(map->virtual, map->size);
 		break;
 	case ttm_bo_map_vmap:
 		pmap_qremove((vm_offset_t)(map->virtual), map->num_pages);
diff --git a/sys/dev/fb/vesa.c b/sys/dev/fb/vesa.c
--- a/sys/dev/fb/vesa.c
+++ b/sys/dev/fb/vesa.c
@@ -1305,7 +1305,8 @@
 			}
 			int10_set_mode(adp->va_initial_bios_mode);
 			if (adp->va_info.vi_flags & V_INFO_LINEAR)
-				pmap_unmapdev(adp->va_buffer, vesa_vmem_max);
+				pmap_unmapdev((void *)adp->va_buffer,
+				    vesa_vmem_max);
 			/* 
 			 * Once (*prevvidsw->get_info)() succeeded, 
 			 * (*prevvidsw->set_mode)() below won't fail...
@@ -1350,7 +1351,7 @@
 		adp->va_flags |= V_ADP_DAC8;
 
 	if (adp->va_info.vi_flags & V_INFO_LINEAR)
-		pmap_unmapdev(adp->va_buffer, vesa_vmem_max);
+		pmap_unmapdev((void *)adp->va_buffer, vesa_vmem_max);
 
 #if VESA_DEBUG > 0
 	printf("VESA: mode set!\n");
diff --git a/sys/dev/ioat/ioat_test.c b/sys/dev/ioat/ioat_test.c
--- a/sys/dev/ioat/ioat_test.c
+++ b/sys/dev/ioat/ioat_test.c
@@ -504,8 +504,7 @@
 	ioat_test_release_memory(test);
 out:
 	if (test->testkind == IOAT_TEST_RAW_DMA && !test->raw_is_virtual)
-		pmap_unmapdev((vm_offset_t)test->raw_vtarget,
-		    test->buffer_size);
+		pmap_unmapdev(test->raw_vtarget, test->buffer_size);
 	ioat_put_dmaengine(dmaengine);
 }
 
diff --git a/sys/dev/ipmi/ipmi_smbios.c b/sys/dev/ipmi/ipmi_smbios.c
--- a/sys/dev/ipmi/ipmi_smbios.c
+++ b/sys/dev/ipmi/ipmi_smbios.c
@@ -182,10 +182,10 @@
 	 */
 	header = pmap_mapbios(addr, sizeof(struct smbios_eps));
 	table = pmap_mapbios(addr, header->length);
-	pmap_unmapbios((vm_offset_t)header, sizeof(struct smbios_eps));
+	pmap_unmapbios(header, sizeof(struct smbios_eps));
 	header = table;
 	if (smbios_cksum(header) != 0) {
-		pmap_unmapbios((vm_offset_t)header, header->length);
+		pmap_unmapbios(header, header->length);
 		return;
 	}
 
@@ -196,8 +196,8 @@
 	    info);
 
 	/* Unmap everything. */
-	pmap_unmapbios((vm_offset_t)table, header->structure_table_length);
-	pmap_unmapbios((vm_offset_t)header, header->length);
+	pmap_unmapbios(table, header->structure_table_length);
+	pmap_unmapbios(header, header->length);
 }
 
 /*
diff --git a/sys/dev/mxge/if_mxge.c b/sys/dev/mxge/if_mxge.c
--- a/sys/dev/mxge/if_mxge.c
+++ b/sys/dev/mxge/if_mxge.c
@@ -435,7 +435,7 @@
 	if (! (vendor_id == ivend && device_id == idev)) {
 		device_printf(sc->dev, "mapping failed: 0x%x:0x%x\n",
 			      vendor_id, device_id);
-		pmap_unmapdev((vm_offset_t)va, PAGE_SIZE);
+		pmap_unmapdev(va, PAGE_SIZE);
 		return;
 	}
 
@@ -444,11 +444,11 @@
 
 	if (val == 0xffffffff) {
 		device_printf(sc->dev, "extended mapping failed\n");
-		pmap_unmapdev((vm_offset_t)va, PAGE_SIZE);
+		pmap_unmapdev(va, PAGE_SIZE);
 		return;
 	}
 	*ptr32 = val | 0x40;
-	pmap_unmapdev((vm_offset_t)va, PAGE_SIZE);
+	pmap_unmapdev(va, PAGE_SIZE);
 	if (mxge_verbose)
 		device_printf(sc->dev,
 			      "Enabled ECRC on upstream Nvidia bridge "
diff --git a/sys/dev/ofw/ofw_pcib.c b/sys/dev/ofw/ofw_pcib.c
--- a/sys/dev/ofw/ofw_pcib.c
+++ b/sys/dev/ofw/ofw_pcib.c
@@ -622,7 +622,7 @@
 	}
 
 	psize = rman_get_size(res);
-	pmap_unmapdev((vm_offset_t)rman_get_virtual(res), psize);
+	pmap_unmapdev(rman_get_virtual(res), psize);
 
 	return (rman_deactivate_resource(res));
 }
diff --git a/sys/dev/pci/vga_pci.c b/sys/dev/pci/vga_pci.c
--- a/sys/dev/pci/vga_pci.c
+++ b/sys/dev/pci/vga_pci.c
@@ -285,7 +285,7 @@
 #if defined(__amd64__) || defined(__i386__)
 	if (vga_pci_is_boot_display(dev)) {
 		/* We mapped the BIOS shadow copy located at 0xC0000. */
-		pmap_unmapdev((vm_offset_t)bios, VGA_PCI_BIOS_SHADOW_SIZE);
+		pmap_unmapdev(bios, VGA_PCI_BIOS_SHADOW_SIZE);
 
 		return;
 	}
diff --git a/sys/dev/powermac_nvram/powermac_nvram.c b/sys/dev/powermac_nvram/powermac_nvram.c
--- a/sys/dev/powermac_nvram/powermac_nvram.c
+++ b/sys/dev/powermac_nvram/powermac_nvram.c
@@ -156,14 +156,14 @@
 	 */
 	i = (i/4) - 2;
 
-	sc->sc_bank0 = (vm_offset_t)pmap_mapdev(reg[i], NVRAM_SIZE * 2);
-	sc->sc_bank1 = sc->sc_bank0 + NVRAM_SIZE;
+	sc->sc_bank0 = pmap_mapdev(reg[i], NVRAM_SIZE * 2);
+	sc->sc_bank1 = (char *)sc->sc_bank0 + NVRAM_SIZE;
 
-	gen0 = powermac_nvram_check((void *)sc->sc_bank0);
-	gen1 = powermac_nvram_check((void *)sc->sc_bank1);
+	gen0 = powermac_nvram_check(sc->sc_bank0);
+	gen1 = powermac_nvram_check(sc->sc_bank1);
 
 	if (gen0 == -1 && gen1 == -1) {
-		if ((void *)sc->sc_bank0 != NULL)
+		if (sc->sc_bank0 != NULL)
 			pmap_unmapdev(sc->sc_bank0, NVRAM_SIZE * 2);
 		device_printf(dev, "both banks appear to be corrupt\n");
 		return ENXIO;
@@ -172,7 +172,7 @@
 	    gen0, gen1);
 
 	sc->sc_bank = (gen0 > gen1) ? sc->sc_bank0 : sc->sc_bank1;
-	bcopy((void *)sc->sc_bank, (void *)sc->sc_data, NVRAM_SIZE);
+	bcopy(sc->sc_bank, sc->sc_data, NVRAM_SIZE);
 
 	sc->sc_cdev = make_dev(&powermac_nvram_cdevsw, 0, 0, 0, 0600,
 	    "powermac_nvram");
@@ -190,7 +190,7 @@
 
 	sc = device_get_softc(dev);
 
-	if ((void *)sc->sc_bank0 != NULL)
+	if (sc->sc_bank0 != NULL)
 		pmap_unmapdev(sc->sc_bank0, NVRAM_SIZE * 2);
 
 	if (sc->sc_cdev != NULL)
@@ -224,12 +224,12 @@
 {
 	struct powermac_nvram_softc *sc = dev->si_drv1;
 	struct core99_header *header;
-	vm_offset_t bank;
+	void *bank;
 
 	sx_xlock(&sc->sc_lock);
 	if (sc->sc_wpos != sizeof(sc->sc_data)) {
 		/* Short write, restore in-memory copy */
-		bcopy((void *)sc->sc_bank, (void *)sc->sc_data, NVRAM_SIZE);
+		bcopy(sc->sc_bank, sc->sc_data, NVRAM_SIZE);
 		sc->sc_isopen = 0;
 		sx_xunlock(&sc->sc_lock);
 		return 0;
@@ -249,8 +249,8 @@
 	    (uint8_t *)&(header->adler_checksum));
 
 	bank = (sc->sc_bank == sc->sc_bank0) ? sc->sc_bank1 : sc->sc_bank0;
-	if (erase_bank(sc->sc_dev, (uint8_t *)bank) != 0 ||
-	    write_bank(sc->sc_dev, (uint8_t *)bank, sc->sc_data) != 0) {
+	if (erase_bank(sc->sc_dev, bank) != 0 ||
+	    write_bank(sc->sc_dev, bank, sc->sc_data) != 0) {
 		sc->sc_isopen = 0;
 		sx_xunlock(&sc->sc_lock);
 		return ENOSPC;
diff --git a/sys/dev/powermac_nvram/powermac_nvramvar.h b/sys/dev/powermac_nvram/powermac_nvramvar.h
--- a/sys/dev/powermac_nvram/powermac_nvramvar.h
+++ b/sys/dev/powermac_nvram/powermac_nvramvar.h
@@ -51,9 +51,9 @@
 	device_t		sc_dev;
 	struct sx		sc_lock;
 	phandle_t		sc_node;
-	vm_offset_t		sc_bank;
-	vm_offset_t		sc_bank0;
-	vm_offset_t		sc_bank1;
+	void *			sc_bank;
+	void *			sc_bank0;
+	void *			sc_bank1;
 	uint8_t			sc_data[NVRAM_SIZE];
 
 	struct cdev *		sc_cdev;
diff --git a/sys/dev/smbios/smbios.c b/sys/dev/smbios/smbios.c
--- a/sys/dev/smbios/smbios.c
+++ b/sys/dev/smbios/smbios.c
@@ -124,7 +124,7 @@
 		device_set_driver(child, driver);
 		bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length);
 		device_set_desc(child, "System Management BIOS");
-		pmap_unmapbios((vm_offset_t)eps, 0x1f);
+		pmap_unmapbios(eps, 0x1f);
 	}
 
 	return;
diff --git a/sys/dev/vt/hw/efifb/efifb.c b/sys/dev/vt/hw/efifb/efifb.c
--- a/sys/dev/vt/hw/efifb/efifb.c
+++ b/sys/dev/vt/hw/efifb/efifb.c
@@ -154,5 +154,5 @@
 	struct fb_info	*info = softc;
 
 	vt_fb_fini(vd, softc);
-	pmap_unmapdev(info->fb_vbase, info->fb_size);
+	pmap_unmapdev((void *)info->fb_vbase, info->fb_size);
 }
diff --git a/sys/dev/vt/hw/vbefb/vbefb.c b/sys/dev/vt/hw/vbefb/vbefb.c
--- a/sys/dev/vt/hw/vbefb/vbefb.c
+++ b/sys/dev/vt/hw/vbefb/vbefb.c
@@ -159,5 +159,5 @@
 	struct fb_info	*info = softc;
 
 	vt_fb_fini(vd, softc);
-	pmap_unmapdev(info->fb_vbase, info->fb_size);
+	pmap_unmapdev((void *)info->fb_vbase, info->fb_size);
 }
diff --git a/sys/dev/xen/bus/xenpv.c b/sys/dev/xen/bus/xenpv.c
--- a/sys/dev/xen/bus/xenpv.c
+++ b/sys/dev/xen/bus/xenpv.c
@@ -144,12 +144,12 @@
 xenpv_free_physmem(device_t dev, device_t child, int res_id, struct resource *res)
 {
 	vm_paddr_t phys_addr;
-	vm_offset_t virt_addr;
+	void *virt_addr;
 	size_t size;
 
 	phys_addr = rman_get_start(res);
 	size = rman_get_size(res);
-	virt_addr = (vm_offset_t)rman_get_virtual(res);
+	virt_addr = rman_get_virtual(res);
 
 	pmap_unmapdev(virt_addr, size);
 	vm_phys_fictitious_unreg_range(phys_addr, phys_addr + size);
diff --git a/sys/i386/acpica/acpi_machdep.c b/sys/i386/acpica/acpi_machdep.c
--- a/sys/i386/acpica/acpi_machdep.c
+++ b/sys/i386/acpica/acpi_machdep.c
@@ -96,7 +96,7 @@
 	/* BIOS address 0xffff5 contains the date in the format mm/dd/yy. */
 	va = pmap_mapbios(0xffff0, 16);
 	sscanf(va + 11, "%2d", &year);
-	pmap_unmapbios((vm_offset_t)va, 16);
+	pmap_unmapbios(va, 16);
 
 	/* 
 	 * Date must be >= 1/1/1999 or we don't trust ACPI.  Note that this
@@ -121,17 +121,17 @@
 
 	header = pmap_mapbios(pa, sizeof(ACPI_TABLE_HEADER));
 	if (strncmp(header->Signature, sig, ACPI_NAMESEG_SIZE) != 0) {
-		pmap_unmapbios((vm_offset_t)header, sizeof(ACPI_TABLE_HEADER));
+		pmap_unmapbios(header, sizeof(ACPI_TABLE_HEADER));
 		return (NULL);
 	}
 	length = header->Length;
-	pmap_unmapbios((vm_offset_t)header, sizeof(ACPI_TABLE_HEADER));
+	pmap_unmapbios(header, sizeof(ACPI_TABLE_HEADER));
 	table = pmap_mapbios(pa, length);
 	if (ACPI_FAILURE(AcpiTbChecksum(table, length))) {
 		if (bootverbose)
 			printf("ACPI: Failed checksum for table %s\n", sig);
 #if (ACPI_CHECKSUM_ABORT)
-		pmap_unmapbios((vm_offset_t)table, length);
+		pmap_unmapbios(table, length);
 		return (NULL);
 #endif
 	}
@@ -150,7 +150,7 @@
 
 	table = pmap_mapbios(address, sizeof(ACPI_TABLE_HEADER));
 	ret = strncmp(table->Signature, sig, ACPI_NAMESEG_SIZE) == 0;
-	pmap_unmapbios((vm_offset_t)table, sizeof(ACPI_TABLE_HEADER));
+	pmap_unmapbios(table, sizeof(ACPI_TABLE_HEADER));
 	return (ret);
 }
 
@@ -172,7 +172,7 @@
 	ACPI_TABLE_HEADER *header;
 
 	header = (ACPI_TABLE_HEADER *)table;
-	pmap_unmapbios((vm_offset_t)table, header->Length);
+	pmap_unmapbios(table, header->Length);
 }
 
 /*
@@ -253,7 +253,7 @@
 			}
 		acpi_unmap_table(rsdt);
 	}
-	pmap_unmapbios((vm_offset_t)rsdp, sizeof(ACPI_TABLE_RSDP));
+	pmap_unmapbios(rsdp, sizeof(ACPI_TABLE_RSDP));
 	if (addr == 0)
 		return (0);
 
diff --git a/sys/i386/i386/pmap.c b/sys/i386/i386/pmap.c
--- a/sys/i386/i386/pmap.c
+++ b/sys/i386/i386/pmap.c
@@ -5503,12 +5503,13 @@
 }
 
 static void
-__CONCAT(PMTYPE, unmapdev)(vm_offset_t va, vm_size_t size)
+__CONCAT(PMTYPE, unmapdev)(void *p, vm_size_t size)
 {
 	struct pmap_preinit_mapping *ppim;
-	vm_offset_t offset;
+	vm_offset_t offset, va;
 	int i;
 
+	va = (vm_offset_t)p;
 	if (va >= PMAP_MAP_LOW && va <= KERNBASE && va + size <= KERNBASE)
 		return;
 	offset = va & PAGE_MASK;
diff --git a/sys/i386/i386/pmap_base.c b/sys/i386/i386/pmap_base.c
--- a/sys/i386/i386/pmap_base.c
+++ b/sys/i386/i386/pmap_base.c
@@ -807,10 +807,10 @@
 }
 
 void
-pmap_unmapdev(vm_offset_t va, vm_size_t size)
+pmap_unmapdev(void *p, vm_size_t size)
 {
 
-	pmap_methods_ptr->pm_unmapdev(va, size);
+	pmap_methods_ptr->pm_unmapdev(p, size);
 }
 
 void
diff --git a/sys/i386/include/pmap.h b/sys/i386/include/pmap.h
--- a/sys/i386/include/pmap.h
+++ b/sys/i386/include/pmap.h
@@ -277,7 +277,7 @@
 void	pmap_remap_lowptdi(bool);
 void	pmap_set_nx(void);
 void	pmap_sf_buf_map(struct sf_buf *sf);
-void	pmap_unmapdev(vm_offset_t, vm_size_t);
+void	pmap_unmapdev(void *, vm_size_t);
 void	pmap_invalidate_page(pmap_t, vm_offset_t);
 void	pmap_invalidate_range(pmap_t, vm_offset_t, vm_offset_t);
 void	pmap_invalidate_all(pmap_t);
diff --git a/sys/i386/include/pmap_base.h b/sys/i386/include/pmap_base.h
--- a/sys/i386/include/pmap_base.h
+++ b/sys/i386/include/pmap_base.h
@@ -96,7 +96,7 @@
 	void (*pm_remove_write)(vm_page_t);
 	int (*pm_ts_referenced)(vm_page_t);
 	void *(*pm_mapdev_attr)(vm_paddr_t, vm_size_t, int, int);
-	void (*pm_unmapdev)(vm_offset_t, vm_size_t);
+	void (*pm_unmapdev)(void *, vm_size_t);
 	void (*pm_page_set_memattr)(vm_page_t, vm_memattr_t);
 	vm_paddr_t (*pm_extract)(pmap_t, vm_offset_t);
 	vm_page_t (*pm_extract_and_hold)(pmap_t, vm_offset_t, vm_prot_t);
diff --git a/sys/kern/subr_devmap.c b/sys/kern/subr_devmap.c
--- a/sys/kern/subr_devmap.c
+++ b/sys/kern/subr_devmap.c
@@ -325,14 +325,15 @@
  * Unmap device memory and free the kva space.
  */
 void
-pmap_unmapdev(vm_offset_t va, vm_size_t size)
+pmap_unmapdev(void *p, vm_size_t size)
 {
-	vm_offset_t offset;
+	vm_offset_t offset, va;
 
 	/* Nothing to do if we find the mapping in the static table. */
-	if (devmap_vtop((void*)va, size) != DEVMAP_PADDR_NOTFOUND)
+	if (devmap_vtop(p, size) != DEVMAP_PADDR_NOTFOUND)
 		return;
 
+	va = (vm_offset_t)p;
 	offset = va & PAGE_MASK;
 	va = trunc_page(va);
 	size = round_page(size + offset);
diff --git a/sys/powerpc/aim/mmu_oea.c b/sys/powerpc/aim/mmu_oea.c
--- a/sys/powerpc/aim/mmu_oea.c
+++ b/sys/powerpc/aim/mmu_oea.c
@@ -315,7 +315,7 @@
 void moea_bootstrap(vm_offset_t, vm_offset_t);
 void *moea_mapdev(vm_paddr_t, vm_size_t);
 void *moea_mapdev_attr(vm_paddr_t, vm_size_t, vm_memattr_t);
-void moea_unmapdev(vm_offset_t, vm_size_t);
+void moea_unmapdev(void *, vm_size_t);
 vm_paddr_t moea_kextract(vm_offset_t);
 void moea_kenter_attr(vm_offset_t, vm_paddr_t, vm_memattr_t);
 void moea_kenter(vm_offset_t, vm_paddr_t);
@@ -2724,14 +2724,15 @@
 }
 
 void
-moea_unmapdev(vm_offset_t va, vm_size_t size)
+moea_unmapdev(void *p, vm_size_t size)
 {
-	vm_offset_t base, offset;
+	vm_offset_t base, offset, va;
 
 	/*
 	 * If this is outside kernel virtual space, then it's a
 	 * battable entry and doesn't require unmapping
 	 */
+	va = (vm_offset_t)p;
 	if ((va >= VM_MIN_KERNEL_ADDRESS) && (va <= virtual_end)) {
 		base = trunc_page(va);
 		offset = va & PAGE_MASK;
diff --git a/sys/powerpc/aim/mmu_oea64.c b/sys/powerpc/aim/mmu_oea64.c
--- a/sys/powerpc/aim/mmu_oea64.c
+++ b/sys/powerpc/aim/mmu_oea64.c
@@ -425,7 +425,7 @@
 void moea64_deactivate(struct thread *);
 void *moea64_mapdev(vm_paddr_t, vm_size_t);
 void *moea64_mapdev_attr(vm_paddr_t, vm_size_t, vm_memattr_t);
-void moea64_unmapdev(vm_offset_t, vm_size_t);
+void moea64_unmapdev(void *, vm_size_t);
 vm_paddr_t moea64_kextract(vm_offset_t);
 void moea64_page_set_memattr(vm_page_t m, vm_memattr_t ma);
 void moea64_kenter_attr(vm_offset_t, vm_paddr_t, vm_memattr_t ma);
@@ -3206,10 +3206,11 @@
 }
 
 void
-moea64_unmapdev(vm_offset_t va, vm_size_t size)
+moea64_unmapdev(void *p, vm_size_t size)
 {
-	vm_offset_t base, offset;
+	vm_offset_t base, offset, va;
 
+	va = (vm_offset_t)p;
 	base = trunc_page(va);
 	offset = va & PAGE_MASK;
 	size = roundup2(offset + size, PAGE_SIZE);
diff --git a/sys/powerpc/aim/mmu_radix.c b/sys/powerpc/aim/mmu_radix.c
--- a/sys/powerpc/aim/mmu_radix.c
+++ b/sys/powerpc/aim/mmu_radix.c
@@ -489,7 +489,7 @@
 
 static void *mmu_radix_mapdev(vm_paddr_t, vm_size_t);
 static void *mmu_radix_mapdev_attr(vm_paddr_t, vm_size_t, vm_memattr_t);
-static void mmu_radix_unmapdev(vm_offset_t, vm_size_t);
+static void mmu_radix_unmapdev(void *, vm_size_t);
 static void mmu_radix_kenter_attr(vm_offset_t, vm_paddr_t, vm_memattr_t ma);
 static boolean_t mmu_radix_dev_direct_mapped(vm_paddr_t, vm_size_t);
 static void mmu_radix_dumpsys_map(vm_paddr_t pa, size_t sz, void **va);
@@ -5900,12 +5900,14 @@
 }
 
 static void
-mmu_radix_unmapdev(vm_offset_t va, vm_size_t size)
+mmu_radix_unmapdev(void *p, vm_size_t size)
 {
-	vm_offset_t offset;
+	vm_offset_t offset, va;
+
+	CTR3(KTR_PMAP, "%s(%p, %#x)", __func__, p, size);
 
-	CTR3(KTR_PMAP, "%s(%#x, %#x)", __func__, va, size);
 	/* If we gave a direct map region in pmap_mapdev, do nothing */
+	va = (vm_offset_t)p;
 	if (va >= DMAP_MIN_ADDRESS && va < DMAP_MAX_ADDRESS)
 		return;
 
diff --git a/sys/powerpc/booke/pmap.c b/sys/powerpc/booke/pmap.c
--- a/sys/powerpc/booke/pmap.c
+++ b/sys/powerpc/booke/pmap.c
@@ -333,7 +333,7 @@
 static void		mmu_booke_bootstrap(vm_offset_t, vm_offset_t);
 static void		*mmu_booke_mapdev(vm_paddr_t, vm_size_t);
 static void		*mmu_booke_mapdev_attr(vm_paddr_t, vm_size_t, vm_memattr_t);
-static void		mmu_booke_unmapdev(vm_offset_t, vm_size_t);
+static void		mmu_booke_unmapdev(void *, vm_size_t);
 static vm_paddr_t	mmu_booke_kextract(vm_offset_t);
 static void		mmu_booke_kenter(vm_offset_t, vm_paddr_t);
 static void		mmu_booke_kenter_attr(vm_offset_t, vm_paddr_t, vm_memattr_t);
@@ -2313,14 +2313,15 @@
  * 'Unmap' a range mapped by mmu_booke_mapdev().
  */
 static void
-mmu_booke_unmapdev(vm_offset_t va, vm_size_t size)
+mmu_booke_unmapdev(void *p, vm_size_t size)
 {
 #ifdef SUPPORTS_SHRINKING_TLB1
-	vm_offset_t base, offset;
+	vm_offset_t base, offset, va;
 
 	/*
 	 * Unmap only if this is inside kernel virtual space.
 	 */
+	va = (vm_offset_t)p;
 	if ((va >= VM_MIN_KERNEL_ADDRESS) && (va <= VM_MAX_KERNEL_ADDRESS)) {
 		base = trunc_page(va);
 		offset = va & PAGE_MASK;
diff --git a/sys/powerpc/include/mmuvar.h b/sys/powerpc/include/mmuvar.h
--- a/sys/powerpc/include/mmuvar.h
+++ b/sys/powerpc/include/mmuvar.h
@@ -38,7 +38,7 @@
 typedef	void	(*pmap_kremove_t)(vm_offset_t);
 typedef	void	*(*pmap_mapdev_t)(vm_paddr_t, vm_size_t);
 typedef	void	*(*pmap_mapdev_attr_t)(vm_paddr_t, vm_size_t, vm_memattr_t);
-typedef	void	(*pmap_unmapdev_t)(vm_offset_t, vm_size_t);
+typedef	void	(*pmap_unmapdev_t)(void *, vm_size_t);
 typedef	void	(*pmap_page_set_memattr_t)(vm_page_t, vm_memattr_t);
 typedef	int	(*pmap_change_attr_t)(vm_offset_t, vm_size_t, vm_memattr_t);
 typedef	int	(*pmap_map_user_ptr_t)(pmap_t, volatile const void *,
diff --git a/sys/powerpc/include/pmap.h b/sys/powerpc/include/pmap.h
--- a/sys/powerpc/include/pmap.h
+++ b/sys/powerpc/include/pmap.h
@@ -310,7 +310,7 @@
 void		pmap_kremove(vm_offset_t);
 void		*pmap_mapdev(vm_paddr_t, vm_size_t);
 void		*pmap_mapdev_attr(vm_paddr_t, vm_size_t, vm_memattr_t);
-void		pmap_unmapdev(vm_offset_t, vm_size_t);
+void		pmap_unmapdev(void *, vm_size_t);
 void		pmap_page_set_memattr(vm_page_t, vm_memattr_t);
 int		pmap_change_attr(vm_offset_t, vm_size_t, vm_memattr_t);
 int		pmap_map_user_ptr(pmap_t pm, volatile const void *uaddr,
diff --git a/sys/powerpc/mpc85xx/lbc.c b/sys/powerpc/mpc85xx/lbc.c
--- a/sys/powerpc/mpc85xx/lbc.c
+++ b/sys/powerpc/mpc85xx/lbc.c
@@ -157,7 +157,8 @@
 		if (sc->sc_range[r].size == 0)
 			return;
 
-		pmap_unmapdev(sc->sc_range[r].kva, sc->sc_range[r].size);
+		pmap_unmapdev((void *)sc->sc_range[r].kva,
+		    sc->sc_range[r].size);
 		law_disable(OCP85XX_TGTIF_LBC, sc->sc_range[r].addr,
 		    sc->sc_range[r].size);
 		r++;
diff --git a/sys/powerpc/powermac/macio.c b/sys/powerpc/powermac/macio.c
--- a/sys/powerpc/powermac/macio.c
+++ b/sys/powerpc/powermac/macio.c
@@ -650,7 +650,7 @@
 		u_int32_t psize;
 
 		psize = rman_get_size(res);
-		pmap_unmapdev((vm_offset_t)rman_get_virtual(res), psize);
+		pmap_unmapdev(rman_get_virtual(res), psize);
 	}
 
 	return (rman_deactivate_resource(res));
diff --git a/sys/powerpc/powermac/uninorth.c b/sys/powerpc/powermac/uninorth.c
--- a/sys/powerpc/powermac/uninorth.c
+++ b/sys/powerpc/powermac/uninorth.c
@@ -613,7 +613,7 @@
 		u_int32_t psize;
 		
 		psize = rman_get_size(res);
-		pmap_unmapdev((vm_offset_t)rman_get_virtual(res), psize);
+		pmap_unmapdev(rman_get_virtual(res), psize);
 	}
 
 	return (rman_deactivate_resource(res));
diff --git a/sys/powerpc/powerpc/nexus.c b/sys/powerpc/powerpc/nexus.c
--- a/sys/powerpc/powerpc/nexus.c
+++ b/sys/powerpc/powerpc/nexus.c
@@ -269,7 +269,7 @@
 		bus_size_t psize;
 
 		psize = rman_get_size(r);
-		pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
+		pmap_unmapdev(rman_get_virtual(r), psize);
 	}
 
 	return (rman_deactivate_resource(r));
@@ -349,7 +349,7 @@
 	 */
 	switch (type) {
 	case SYS_RES_MEMORY:
-		pmap_unmapdev((vm_offset_t)map->r_vaddr, map->r_size);
+		pmap_unmapdev(map->r_vaddr, map->r_size);
 		/* FALLTHROUGH */
 	case SYS_RES_IOPORT:
 		break;
diff --git a/sys/powerpc/powerpc/pmap_dispatch.c b/sys/powerpc/powerpc/pmap_dispatch.c
--- a/sys/powerpc/powerpc/pmap_dispatch.c
+++ b/sys/powerpc/powerpc/pmap_dispatch.c
@@ -175,7 +175,7 @@
 DEFINE_PMAP_IFUNC(void *, mapdev, (vm_paddr_t, vm_size_t));
 DEFINE_PMAP_IFUNC(void *, mapdev_attr, (vm_paddr_t, vm_size_t, vm_memattr_t));
 DEFINE_PMAP_IFUNC(void, page_set_memattr, (vm_page_t, vm_memattr_t));
-DEFINE_PMAP_IFUNC(void, unmapdev, (vm_offset_t, vm_size_t));
+DEFINE_PMAP_IFUNC(void, unmapdev, (void *, vm_size_t));
 DEFINE_PMAP_IFUNC(int, map_user_ptr,
     (pmap_t, volatile const void *, void **, size_t, size_t *));
 DEFINE_PMAP_IFUNC(int, decode_kernel_ptr, (vm_offset_t, int *, vm_offset_t *));
diff --git a/sys/powerpc/psim/iobus.c b/sys/powerpc/psim/iobus.c
--- a/sys/powerpc/psim/iobus.c
+++ b/sys/powerpc/psim/iobus.c
@@ -395,7 +395,7 @@
 		u_int32_t psize;
 
 		psize = rman_get_size(res);
-		pmap_unmapdev((vm_offset_t)rman_get_virtual(res), psize);
+		pmap_unmapdev(rman_get_virtual(res), psize);
 	}
 
 	return (rman_deactivate_resource(res));
diff --git a/sys/riscv/include/pmap.h b/sys/riscv/include/pmap.h
--- a/sys/riscv/include/pmap.h
+++ b/sys/riscv/include/pmap.h
@@ -169,8 +169,8 @@
 
 void	*pmap_mapdev(vm_paddr_t, vm_size_t);
 void	*pmap_mapbios(vm_paddr_t, vm_size_t);
-void	pmap_unmapdev(vm_offset_t, vm_size_t);
-void	pmap_unmapbios(vm_offset_t, vm_size_t);
+void	pmap_unmapdev(void *, vm_size_t);
+void	pmap_unmapbios(void *, vm_size_t);
 
 boolean_t pmap_map_io_transient(vm_page_t *, vm_offset_t *, int, boolean_t);
 void	pmap_unmap_io_transient(vm_page_t *, vm_offset_t *, int, boolean_t);
diff --git a/sys/riscv/riscv/bus_machdep.c b/sys/riscv/riscv/bus_machdep.c
--- a/sys/riscv/riscv/bus_machdep.c
+++ b/sys/riscv/riscv/bus_machdep.c
@@ -106,7 +106,7 @@
 generic_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
 {
 
-	pmap_unmapdev(bsh, size);
+	pmap_unmapdev((void *)bsh, size);
 }
 
 static void
diff --git a/sys/riscv/riscv/pmap.c b/sys/riscv/riscv/pmap.c
--- a/sys/riscv/riscv/pmap.c
+++ b/sys/riscv/riscv/pmap.c
@@ -4455,7 +4455,7 @@
 }
 
 void
-pmap_unmapbios(vm_paddr_t pa, vm_size_t size)
+pmap_unmapbios(void *p, vm_size_t size)
 {
 }
 
diff --git a/sys/x86/x86/bus_machdep.c b/sys/x86/x86/bus_machdep.c
--- a/sys/x86/x86/bus_machdep.c
+++ b/sys/x86/x86/bus_machdep.c
@@ -59,5 +59,5 @@
 {
 
 	if (tag == X86_BUS_SPACE_MEM)
-		pmap_unmapdev(bsh, size);
+		pmap_unmapdev((void *)bsh, size);
 }
diff --git a/sys/x86/x86/io_apic.c b/sys/x86/x86/io_apic.c
--- a/sys/x86/x86/io_apic.c
+++ b/sys/x86/x86/io_apic.c
@@ -613,7 +613,7 @@
 {
 	struct ioapic *io;
 	struct ioapic_intsrc *intpin;
-	volatile ioapic_t *apic;
+	ioapic_t *apic;
 	u_int numintr, i;
 	uint32_t value;
 
@@ -625,7 +625,7 @@
 
 	/* If it's version register doesn't seem to work, punt. */
 	if (value == 0xffffffff) {
-		pmap_unmapdev((vm_offset_t)apic, IOAPIC_MEM_REGION);
+		pmap_unmapdev(apic, IOAPIC_MEM_REGION);
 		return (NULL);
 	}
 
diff --git a/sys/x86/x86/nexus.c b/sys/x86/x86/nexus.c
--- a/sys/x86/x86/nexus.c
+++ b/sys/x86/x86/nexus.c
@@ -542,7 +542,7 @@
 	 */
 	switch (type) {
 	case SYS_RES_MEMORY:
-		pmap_unmapdev((vm_offset_t)map->r_vaddr, map->r_size);
+		pmap_unmapdev(map->r_vaddr, map->r_size);
 		/* FALLTHROUGH */
 	case SYS_RES_IOPORT:
 		break;