MFC r281495:

Add config option PAE_TABLES for the i386 kernel.  It switches pmap to
use PAE format for the page tables, but does not incur other
consequences of the full PAE config.  In particular, vm_paddr_t and
bus_addr_t are left 32bit, and max supported memory is still limited
by 4GB.

The option allows to have nx permissions for memory mappings on i386
kernel, while keeping the usual i386 KBI and avoiding the kernel data
sizing problems typical for the PAE config.

14 files changed, 54 insertions, 51 deletions

diff --git a/sys/i386/i386/bios.c b/sys/i386/i386/bios.c
index ffe42ba..e35d986 100644
--- a/sys/i386/i386/bios.c
+++ b/sys/i386/i386/bios.c
@@ -389,7 +389,7 @@ bios16(struct bios_args *args, char *fmt, ...)
     args->seg.code32.limit = 0xffff;	
 
     ptd = (pd_entry_t *)rcr3();
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
     if (ptd == IdlePDPT)
 #else
     if (ptd == IdlePTD)
diff --git a/sys/i386/i386/initcpu.c b/sys/i386/i386/initcpu.c
index 291f3fc..9d8c265 100644
--- a/sys/i386/i386/initcpu.c
+++ b/sys/i386/i386/initcpu.c
@@ -784,7 +784,7 @@ initializecpu(void)
 			init_transmeta();
 			break;
 		}
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 		if ((amd_feature & AMDID_NX) != 0) {
 			uint64_t msr;
 
diff --git a/sys/i386/i386/locore.s b/sys/i386/i386/locore.s
index ce6c9f9..7138ab4 100644
--- a/sys/i386/i386/locore.s
+++ b/sys/i386/i386/locore.s
@@ -99,7 +99,7 @@ physfree:	.long	0		/* phys addr of next free page */
 	.globl	IdlePTD
 IdlePTD:	.long	0		/* phys addr of kernel PTD */
 
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	.globl	IdlePDPT
 IdlePDPT:	.long	0		/* phys addr of kernel PDPT */
 #endif
@@ -281,7 +281,7 @@ NON_GPROF_ENTRY(btext)
 1:
 
 /* Now enable paging */
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	movl	R(IdlePDPT), %eax
 	movl	%eax, %cr3
 	movl	%cr4, %eax
@@ -722,7 +722,7 @@ no_kernend:
 	movl	%esi,R(KPTmap)
 
 /* Allocate Page Table Directory */
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	/* XXX only need 32 bytes (easier for now) */
 	ALLOCPAGES(1)
 	movl	%esi,R(IdlePDPT)
@@ -788,7 +788,7 @@ no_kernend:
 	fillkptphys($PG_RW)
 
 /* Map page directory. */
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	movl	R(IdlePDPT), %eax
 	movl	$1, %ecx
 	fillkptphys($PG_RW)
@@ -890,7 +890,7 @@ done_pde:
 	movl	$NPGPTD,%ecx
 	fillkpt(R(IdlePTD), $PG_RW)
 
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	movl	R(IdlePTD), %eax
 	xorl	%ebx, %ebx
 	movl	$NPGPTD, %ecx
diff --git a/sys/i386/i386/machdep.c b/sys/i386/i386/machdep.c
index e2e2932..7e2a820 100644
--- a/sys/i386/i386/machdep.c
+++ b/sys/i386/i386/machdep.c
@@ -3080,7 +3080,7 @@ init386(first)
 	    dblfault_tss.tss_esp2 = (int)&dblfault_stack[sizeof(dblfault_stack)];
 	dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 =
 	    dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	dblfault_tss.tss_cr3 = (int)IdlePDPT;
 #else
 	dblfault_tss.tss_cr3 = (int)IdlePTD;
@@ -3133,7 +3133,7 @@ init386(first)
 
 	/* setup proc 0's pcb */
 	thread0.td_pcb->pcb_flags = 0;
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	thread0.td_pcb->pcb_cr3 = (int)IdlePDPT;
 #else
 	thread0.td_pcb->pcb_cr3 = (int)IdlePTD;
@@ -3385,7 +3385,7 @@ init386(first)
 	    dblfault_tss.tss_esp2 = (int)&dblfault_stack[sizeof(dblfault_stack)];
 	dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 =
 	    dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	dblfault_tss.tss_cr3 = (int)IdlePDPT;
 #else
 	dblfault_tss.tss_cr3 = (int)IdlePTD;
@@ -3457,7 +3457,7 @@ init386(first)
 
 	/* setup proc 0's pcb */
 	thread0.td_pcb->pcb_flags = 0;
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	thread0.td_pcb->pcb_cr3 = (int)IdlePDPT;
 #else
 	thread0.td_pcb->pcb_cr3 = (int)IdlePTD;
diff --git a/sys/i386/i386/minidump_machdep.c b/sys/i386/i386/minidump_machdep.c
index e0cd1ff..70c29d8 100644
--- a/sys/i386/i386/minidump_machdep.c
+++ b/sys/i386/i386/minidump_machdep.c
@@ -265,7 +265,7 @@ minidumpsys(struct dumperinfo *di)
 	mdhdr.bitmapsize = vm_page_dump_size;
 	mdhdr.ptesize = ptesize;
 	mdhdr.kernbase = KERNBASE;
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	mdhdr.paemode = 1;
 #endif
 
diff --git a/sys/i386/i386/mpboot.s b/sys/i386/i386/mpboot.s
index a3ef283..8f5098d 100644
--- a/sys/i386/i386/mpboot.s
+++ b/sys/i386/i386/mpboot.s
@@ -99,7 +99,7 @@ NON_GPROF_ENTRY(MPentry)
 	movl	%eax,%cr4
 
 	/* Now enable paging mode */
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	movl	R(IdlePDPT), %eax
 	movl	%eax, %cr3
 	movl	%cr4, %eax
diff --git a/sys/i386/i386/pmap.c b/sys/i386/i386/pmap.c
index 3bd44d9..4e09a90 100644
--- a/sys/i386/i386/pmap.c
+++ b/sys/i386/i386/pmap.c
@@ -214,7 +214,7 @@ vm_offset_t kernel_vm_end = KERNBASE + NKPT * NBPDR;
 extern u_int32_t KERNend;
 extern u_int32_t KPTphys;
 
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 pt_entry_t pg_nx;
 static uma_zone_t pdptzone;
 #endif
@@ -339,7 +339,7 @@ static void _pmap_unwire_ptp(pmap_t pmap, vm_page_t m, struct spglist *free);
 static pt_entry_t *pmap_pte_quick(pmap_t pmap, vm_offset_t va);
 static void pmap_pte_release(pt_entry_t *pte);
 static int pmap_unuse_pt(pmap_t, vm_offset_t, struct spglist *);
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 static void *pmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait);
 #endif
 static void pmap_set_pg(void);
@@ -399,7 +399,7 @@ pmap_bootstrap(vm_paddr_t firstaddr)
 	 */
 	PMAP_LOCK_INIT(kernel_pmap);
 	kernel_pmap->pm_pdir = (pd_entry_t *) (KERNBASE + (u_int)IdlePTD);
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	kernel_pmap->pm_pdpt = (pdpt_entry_t *) (KERNBASE + (u_int)IdlePDPT);
 #endif
 	CPU_FILL(&kernel_pmap->pm_active);	/* don't allow deactivation */
@@ -656,7 +656,7 @@ pmap_page_init(vm_page_t m)
 	m->md.pat_mode = PAT_WRITE_BACK;
 }
 
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 static void *
 pmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
 {
@@ -669,7 +669,7 @@ pmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
 #endif
 
 /*
- * ABuse the pte nodes for unmapped kva to thread a kva freelist through.
+ * Abuse the pte nodes for unmapped kva to thread a kva freelist through.
  * Requirements:
  *  - Must deal with pages in order to ensure that none of the PG_* bits
  *    are ever set, PG_V in particular.
@@ -808,7 +808,7 @@ pmap_init(void)
 	if (pv_chunkbase == NULL)
 		panic("pmap_init: not enough kvm for pv chunks");
 	pmap_ptelist_init(&pv_vafree, pv_chunkbase, pv_maxchunks);
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	pdptzone = uma_zcreate("PDPT", NPGPTD * sizeof(pdpt_entry_t), NULL,
 	    NULL, NULL, NULL, (NPGPTD * sizeof(pdpt_entry_t)) - 1,
 	    UMA_ZONE_VM | UMA_ZONE_NOFREE);
@@ -1743,7 +1743,7 @@ pmap_pinit0(pmap_t pmap)
 	 * not need to be inserted into that list.
 	 */
 	pmap->pm_pdir = (pd_entry_t *)(KERNBASE + (vm_offset_t)IdlePTD);
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	pmap->pm_pdpt = (pdpt_entry_t *)(KERNBASE + (vm_offset_t)IdlePDPT);
 #endif
 	pmap->pm_root.rt_root = 0;
@@ -1772,7 +1772,7 @@ pmap_pinit(pmap_t pmap)
 		pmap->pm_pdir = (pd_entry_t *)kva_alloc(NBPTD);
 		if (pmap->pm_pdir == NULL)
 			return (0);
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 		pmap->pm_pdpt = uma_zalloc(pdptzone, M_WAITOK | M_ZERO);
 		KASSERT(((vm_offset_t)pmap->pm_pdpt &
 		    ((NPGPTD * sizeof(pdpt_entry_t)) - 1)) == 0,
@@ -1814,7 +1814,7 @@ pmap_pinit(pmap_t pmap)
 	for (i = 0; i < NPGPTD; i++) {
 		pa = VM_PAGE_TO_PHYS(ptdpg[i]);
 		pmap->pm_pdir[PTDPTDI + i] = pa | PG_V | PG_RW | PG_A | PG_M;
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 		pmap->pm_pdpt[i] = pa | PG_V;
 #endif
 	}
@@ -1973,7 +1973,7 @@ pmap_lazyfix(pmap_t pmap)
 		lsb--;
 		CPU_SETOF(lsb, &mask);
 		mtx_lock_spin(&smp_ipi_mtx);
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 		lazyptd = vtophys(pmap->pm_pdpt);
 #else
 		lazyptd = vtophys(pmap->pm_pdir);
@@ -2057,7 +2057,7 @@ pmap_release(pmap_t pmap)
 
 	for (i = 0; i < NPGPTD; i++) {
 		m = ptdpg[i];
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 		KASSERT(VM_PAGE_TO_PHYS(m) == (pmap->pm_pdpt[i] & PG_FRAME),
 		    ("pmap_release: got wrong ptd page"));
 #endif
@@ -3149,7 +3149,7 @@ retry:
 	}
 	if ((prot & VM_PROT_WRITE) == 0)
 		newpde &= ~(PG_RW | PG_M);
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	if ((prot & VM_PROT_EXECUTE) == 0)
 		newpde |= pg_nx;
 #endif
@@ -3182,7 +3182,7 @@ pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
 		return;
 	}
 
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	if ((prot & (VM_PROT_WRITE|VM_PROT_EXECUTE)) ==
 	    (VM_PROT_WRITE|VM_PROT_EXECUTE))
 		return;
@@ -3285,13 +3285,13 @@ retry:
 				}
 				pbits &= ~(PG_RW | PG_M);
 			}
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 			if ((prot & VM_PROT_EXECUTE) == 0)
 				pbits |= pg_nx;
 #endif
 
 			if (pbits != obits) {
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 				if (!atomic_cmpset_64(pte, obits, pbits))
 					goto retry;
 #else
@@ -3605,7 +3605,7 @@ validate:
 		if ((newpte & PG_MANAGED) != 0)
 			vm_page_aflag_set(m, PGA_WRITEABLE);
 	}
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	if ((prot & VM_PROT_EXECUTE) == 0)
 		newpte |= pg_nx;
 #endif
@@ -3632,7 +3632,7 @@ validate:
 					vm_page_aflag_set(om, PGA_REFERENCED);
 				if (opa != VM_PAGE_TO_PHYS(m))
 					invlva = TRUE;
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 				if ((origpte & PG_NX) == 0 &&
 				    (newpte & PG_NX) != 0)
 					invlva = TRUE;
@@ -3703,7 +3703,7 @@ pmap_enter_pde(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot)
 			return (FALSE);
 		}
 	}
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	if ((prot & VM_PROT_EXECUTE) == 0)
 		newpde |= pg_nx;
 #endif
@@ -3880,7 +3880,7 @@ pmap_enter_quick_locked(pmap_t pmap, vm_offset_t va, vm_page_t m,
 	pmap->pm_stats.resident_count++;
 
 	pa = VM_PAGE_TO_PHYS(m) | pmap_cache_bits(m->md.pat_mode, 0);
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	if ((prot & VM_PROT_EXECUTE) == 0)
 		pa |= pg_nx;
 #endif
@@ -5460,7 +5460,7 @@ pmap_activate(struct thread *td)
 	CPU_CLR(cpuid, &oldpmap->pm_active);
 	CPU_SET(cpuid, &pmap->pm_active);
 #endif
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	cr3 = vtophys(pmap->pm_pdpt);
 #else
 	cr3 = vtophys(pmap->pm_pdir);
diff --git a/sys/i386/i386/swtch.s b/sys/i386/i386/swtch.s
index e810434..2859ec7 100644
--- a/sys/i386/i386/swtch.s
+++ b/sys/i386/i386/swtch.s
@@ -174,7 +174,7 @@ ENTRY(cpu_switch)
 
 	/* switch address space */
 	movl	PCB_CR3(%edx),%eax
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	cmpl	%eax,IdlePDPT			/* Kernel address space? */
 #else
 	cmpl	%eax,IdlePTD			/* Kernel address space? */
diff --git a/sys/i386/i386/trap.c b/sys/i386/i386/trap.c
index 786c1f0..1bf76bd 100644
--- a/sys/i386/i386/trap.c
+++ b/sys/i386/i386/trap.c
@@ -884,7 +884,7 @@ trap_pfault(frame, usermode, eva)
 	 */
 	if (frame->tf_err & PGEX_W)
 		ftype = VM_PROT_WRITE;
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	else if ((frame->tf_err & PGEX_I) && pg_nx != 0)
 		ftype = VM_PROT_EXECUTE;
 #endif
diff --git a/sys/i386/i386/vm86bios.s b/sys/i386/i386/vm86bios.s
index db8aea0..9c2a373 100644
--- a/sys/i386/i386/vm86bios.s
+++ b/sys/i386/i386/vm86bios.s
@@ -122,7 +122,7 @@ ENTRY(vm86_bioscall)
 	movl	SCR_NEWPTD(%edx),%eax	/* mapping for vm86 page table */
 	movl	%eax,0(%ebx)		/* ... install as PTD entry 0 */
 
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	movl	IdlePDPT,%ecx
 #endif
 	movl	%ecx,%cr3		/* new page tables */
diff --git a/sys/i386/i386/vm_machdep.c b/sys/i386/i386/vm_machdep.c
index d0a0740..7b73a2d 100644
--- a/sys/i386/i386/vm_machdep.c
+++ b/sys/i386/i386/vm_machdep.c
@@ -294,7 +294,7 @@ cpu_fork(td1, p2, td2, flags)
 	 * Set registers for trampoline to user mode.  Leave space for the
 	 * return address on stack.  These are the kernel mode register values.
 	 */
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 	pcb2->pcb_cr3 = vtophys(vmspace_pmap(p2->p_vmspace)->pm_pdpt);
 #else
 	pcb2->pcb_cr3 = vtophys(vmspace_pmap(p2->p_vmspace)->pm_pdir);
diff --git a/sys/i386/include/param.h b/sys/i386/include/param.h
index d7148ae..54477c1 100644
--- a/sys/i386/include/param.h
+++ b/sys/i386/include/param.h
@@ -90,7 +90,7 @@
 #define PAGE_MASK	(PAGE_SIZE-1)
 #define NPTEPG		(PAGE_SIZE/(sizeof (pt_entry_t)))
 
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 #define NPGPTD		4
 #define PDRSHIFT	21		/* LOG2(NBPDR) */
 #define NPGPTD_SHIFT	9
diff --git a/sys/i386/include/pmap.h b/sys/i386/include/pmap.h
index 2c9a409..0d8057f 100644
--- a/sys/i386/include/pmap.h
+++ b/sys/i386/include/pmap.h
@@ -63,7 +63,7 @@
 #define	PG_AVAIL2	0x400	/*   <	programmers use		*/
 #define	PG_AVAIL3	0x800	/*    \				*/
 #define	PG_PDE_PAT	0x1000	/* PAT	PAT index		*/
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 #define	PG_NX		(1ull<<63) /* No-execute */
 #endif
 
@@ -71,7 +71,7 @@
 /* Our various interpretations of the above */
 #define PG_W		PG_AVAIL1	/* "Wired" pseudoflag */
 #define	PG_MANAGED	PG_AVAIL2
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 #define	PG_FRAME	(0x000ffffffffff000ull)
 #define	PG_PS_FRAME	(0x000fffffffe00000ull)
 #else
@@ -110,7 +110,7 @@
  * is 1 Gigabyte.  Double everything.  It must be a multiple of 8 for PAE.
  */
 #ifndef KVA_PAGES
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 #define KVA_PAGES	512
 #else
 #define KVA_PAGES	256
@@ -128,11 +128,14 @@
  * be calculated as follows:
  *     max_phys / PAGE_SIZE * sizeof(struct vm_page) / NBPDR
  * PAE:      max_phys 16G, sizeof(vm_page) 76, NBPDR 2M, 152 page table pages.
+ * PAE_TABLES: max_phys 4G,  sizeof(vm_page) 68, NBPDR 2M, 36 page table pages.
  * Non-PAE:  max_phys 4G,  sizeof(vm_page) 68, NBPDR 4M, 18 page table pages.
  */
 #ifndef NKPT
-#ifdef PAE
+#if defined(PAE)
 #define	NKPT		240
+#elif defined(PAE_TABLES)
+#define	NKPT		60
 #else
 #define	NKPT		30
 #endif
@@ -166,7 +169,7 @@
 
 #include <vm/_vm_radix.h>
 
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 
 typedef uint64_t pdpt_entry_t;
 typedef uint64_t pd_entry_t;
@@ -193,7 +196,7 @@ extern pt_entry_t PTmap[];
 extern pd_entry_t PTD[];
 extern pd_entry_t PTDpde[];
 
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 extern pdpt_entry_t *IdlePDPT;
 #endif
 extern pd_entry_t *IdlePTD;	/* physical address of "Idle" state directory */
@@ -331,7 +334,7 @@ pmap_kextract(vm_offset_t va)
 #define PT_UPDATES_FLUSH()
 #endif
 
-#if defined(PAE) && !defined(XEN)
+#if (defined(PAE) || defined(PAE_TABLES)) && !defined(XEN)
 
 #define	pde_cmpset(pdep, old, new)	atomic_cmpset_64_i586(pdep, old, new)
 #define	pte_load_store(ptep, pte)	atomic_swap_64_i586(ptep, pte)
@@ -340,7 +343,7 @@ pmap_kextract(vm_offset_t va)
 
 extern pt_entry_t pg_nx;
 
-#elif !defined(PAE) && !defined(XEN)
+#elif !defined(PAE) && !defined(PAE_TABLES) && !defined(XEN)
 
 #define	pde_cmpset(pdep, old, new)	atomic_cmpset_int(pdep, old, new)
 #define	pte_load_store(ptep, pte)	atomic_swap_int(ptep, pte)
@@ -375,8 +378,8 @@ struct pmap {
 	cpuset_t		pm_active;	/* active on cpus */
 	struct pmap_statistics	pm_stats;	/* pmap statistics */
 	LIST_ENTRY(pmap) 	pm_list;	/* List of all pmaps */
-#ifdef PAE
-	pdpt_entry_t		*pm_pdpt;	/* KVA of page director pointer
+#if defined(PAE) || defined(PAE_TABLES)
+	pdpt_entry_t		*pm_pdpt;	/* KVA of page directory pointer
 						   table */
 #endif
 	struct vm_radix		pm_root;	/* spare page table pages */
diff --git a/sys/i386/include/vmparam.h b/sys/i386/include/vmparam.h
index 9a0dfd8..2e75c8c 100644
--- a/sys/i386/include/vmparam.h
+++ b/sys/i386/include/vmparam.h
@@ -120,11 +120,11 @@
 #endif
 
 /*
- * Level 0 reservations consist of 512 pages under PAE and 1024 pages
- * otherwise.
+ * Level 0 reservations consist of 512 pages when PAE pagetables are
+ * used, and 1024 pages otherwise.
  */
 #ifndef	VM_LEVEL_0_ORDER
-#ifdef PAE
+#if defined(PAE) || defined(PAE_TABLES)
 #define	VM_LEVEL_0_ORDER	9
 #else
 #define	VM_LEVEL_0_ORDER	10