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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] [XEN] Add new safe pte update macros and use as necessary when
# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Node ID 1d83974d08b1e4b6a38e979eda8179a06ffccc81
# Parent 93314655b16f62809c83644eed84592ebe4e8001
[XEN] Add new safe pte update macros and use as necessary when
updating active pagetables.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
xen/arch/x86/mm.c | 54 +++++++++++++++++--------------
xen/arch/x86/mm/shadow/multi.c | 2 +
xen/arch/x86/x86_32/domain_page.c | 10 ++---
xen/arch/x86/x86_32/mm.c | 35 ++++++++++----------
xen/arch/x86/x86_64/mm.c | 31 +++++++++--------
xen/include/asm-x86/page.h | 15 ++++++--
xen/include/asm-x86/x86_32/page-2level.h | 3 +
xen/include/asm-x86/x86_32/page-3level.h | 7 ++++
xen/include/asm-x86/x86_64/page.h | 3 +
9 files changed, 95 insertions(+), 65 deletions(-)
diff -r 93314655b16f -r 1d83974d08b1 xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c Thu Dec 07 14:40:13 2006 +0000
+++ b/xen/arch/x86/mm.c Thu Dec 07 14:57:14 2006 +0000
@@ -335,7 +335,7 @@ void make_cr3(struct vcpu *v, unsigned l
cache->high_mfn = mfn;
/* Map the guest L3 table and copy to the chosen low-memory cache. */
- *(fix_pae_highmem_pl1e - cpu) = l1e_from_pfn(mfn, __PAGE_HYPERVISOR);
+ l1e_write(fix_pae_highmem_pl1e-cpu, l1e_from_pfn(mfn, __PAGE_HYPERVISOR));
/* First check the previous high mapping can't be in the TLB.
* (i.e. have we loaded CR3 since we last did this?) */
if ( unlikely(this_cpu(make_cr3_timestamp) == this_cpu(tlbflush_time)) )
@@ -343,7 +343,7 @@ void make_cr3(struct vcpu *v, unsigned l
highmem_l3tab = (l3_pgentry_t *)fix_to_virt(FIX_PAE_HIGHMEM_0 + cpu);
lowmem_l3tab = cache->table[cache->inuse_idx];
memcpy(lowmem_l3tab, highmem_l3tab, sizeof(cache->table[0]));
- *(fix_pae_highmem_pl1e - cpu) = l1e_empty();
+ l1e_write(fix_pae_highmem_pl1e-cpu, l1e_empty());
this_cpu(make_cr3_timestamp) = this_cpu(tlbflush_time);
v->arch.cr3 = __pa(lowmem_l3tab);
@@ -380,7 +380,7 @@ void invalidate_shadow_ldt(struct vcpu *
{
pfn = l1e_get_pfn(v->arch.perdomain_ptes[i]);
if ( pfn == 0 ) continue;
- v->arch.perdomain_ptes[i] = l1e_empty();
+ l1e_write(&v->arch.perdomain_ptes[i], l1e_empty());
page = mfn_to_page(pfn);
ASSERT_PAGE_IS_TYPE(page, PGT_ldt_page);
ASSERT_PAGE_IS_DOMAIN(page, v->domain);
@@ -449,7 +449,7 @@ int map_ldt_shadow_page(unsigned int off
nl1e = l1e_from_pfn(mfn, l1e_get_flags(l1e) | _PAGE_RW);
- v->arch.perdomain_ptes[off + 16] = nl1e;
+ l1e_write(&v->arch.perdomain_ptes[off + 16], nl1e);
v->arch.shadow_ldt_mapcnt++;
return 1;
@@ -851,7 +851,7 @@ static int create_pae_xen_mappings(l3_pg
static int create_pae_xen_mappings(l3_pgentry_t *pl3e)
{
struct page_info *page;
- l2_pgentry_t *pl2e;
+ l2_pgentry_t *pl2e, l2e;
l3_pgentry_t l3e3;
int i;
@@ -892,15 +892,19 @@ static int create_pae_xen_mappings(l3_pg
&idle_pg_table_l2[L2_PAGETABLE_FIRST_XEN_SLOT],
L2_PAGETABLE_XEN_SLOTS * sizeof(l2_pgentry_t));
for ( i = 0; i < PDPT_L2_ENTRIES; i++ )
- pl2e[l2_table_offset(PERDOMAIN_VIRT_START) + i] =
- l2e_from_page(
- virt_to_page(page_get_owner(page)->arch.mm_perdomain_pt) + i,
- __PAGE_HYPERVISOR);
+ {
+ l2e = l2e_from_page(
+ virt_to_page(page_get_owner(page)->arch.mm_perdomain_pt) + i,
+ __PAGE_HYPERVISOR);
+ l2e_write(&pl2e[l2_table_offset(PERDOMAIN_VIRT_START) + i], l2e);
+ }
for ( i = 0; i < (LINEARPT_MBYTES >> (L2_PAGETABLE_SHIFT - 20)); i++ )
- pl2e[l2_table_offset(LINEAR_PT_VIRT_START) + i] =
- (l3e_get_flags(pl3e[i]) & _PAGE_PRESENT) ?
- l2e_from_pfn(l3e_get_pfn(pl3e[i]), __PAGE_HYPERVISOR) :
- l2e_empty();
+ {
+ l2e = l2e_empty();
+ if ( l3e_get_flags(pl3e[i]) & _PAGE_PRESENT )
+ l2e = l2e_from_pfn(l3e_get_pfn(pl3e[i]), __PAGE_HYPERVISOR);
+ l2e_write(&pl2e[l2_table_offset(LINEAR_PT_VIRT_START) + i], l2e);
+ }
unmap_domain_page(pl2e);
return 1;
@@ -2760,7 +2764,7 @@ void destroy_gdt(struct vcpu *v)
{
if ( (pfn = l1e_get_pfn(v->arch.perdomain_ptes[i])) != 0 )
put_page_and_type(mfn_to_page(pfn));
- v->arch.perdomain_ptes[i] = l1e_empty();
+ l1e_write(&v->arch.perdomain_ptes[i], l1e_empty());
v->arch.guest_context.gdt_frames[i] = 0;
}
}
@@ -2794,8 +2798,8 @@ long set_gdt(struct vcpu *v,
for ( i = 0; i < nr_pages; i++ )
{
v->arch.guest_context.gdt_frames[i] = frames[i];
- v->arch.perdomain_ptes[i] =
- l1e_from_pfn(frames[i], __PAGE_HYPERVISOR);
+ l1e_write(&v->arch.perdomain_ptes[i],
+ l1e_from_pfn(frames[i], __PAGE_HYPERVISOR));
}
return 0;
@@ -3298,8 +3302,8 @@ int map_pages_to_xen(
!map_small_pages )
{
/* Super-page mapping. */
- ol2e = *pl2e;
- *pl2e = l2e_from_pfn(mfn, flags|_PAGE_PSE);
+ ol2e = *pl2e;
+ l2e_write(pl2e, l2e_from_pfn(mfn, flags|_PAGE_PSE));
if ( (l2e_get_flags(ol2e) & _PAGE_PRESENT) )
{
@@ -3319,22 +3323,24 @@ int map_pages_to_xen(
{
pl1e = page_to_virt(alloc_xen_pagetable());
clear_page(pl1e);
- *pl2e = l2e_from_page(virt_to_page(pl1e), __PAGE_HYPERVISOR);
+ l2e_write(pl2e, l2e_from_page(virt_to_page(pl1e),
+ __PAGE_HYPERVISOR));
}
else if ( l2e_get_flags(*pl2e) & _PAGE_PSE )
{
pl1e = page_to_virt(alloc_xen_pagetable());
for ( i = 0; i < L1_PAGETABLE_ENTRIES; i++ )
- pl1e[i] = l1e_from_pfn(
- l2e_get_pfn(*pl2e) + i,
- l2e_get_flags(*pl2e) & ~_PAGE_PSE);
- *pl2e = l2e_from_page(virt_to_page(pl1e), __PAGE_HYPERVISOR);
+ l1e_write(&pl1e[i],
+ l1e_from_pfn(l2e_get_pfn(*pl2e) + i,
+ l2e_get_flags(*pl2e) & ~_PAGE_PSE));
+ l2e_write(pl2e, l2e_from_page(virt_to_page(pl1e),
+ __PAGE_HYPERVISOR));
local_flush_tlb_pge();
}
pl1e = l2e_to_l1e(*pl2e) + l1_table_offset(virt);
ol1e = *pl1e;
- *pl1e = l1e_from_pfn(mfn, flags);
+ l1e_write(pl1e, l1e_from_pfn(mfn, flags));
if ( (l1e_get_flags(ol1e) & _PAGE_PRESENT) )
local_flush_tlb_one(virt);
diff -r 93314655b16f -r 1d83974d08b1 xen/arch/x86/mm/shadow/multi.c
--- a/xen/arch/x86/mm/shadow/multi.c Thu Dec 07 14:40:13 2006 +0000
+++ b/xen/arch/x86/mm/shadow/multi.c Thu Dec 07 14:57:14 2006 +0000
@@ -851,7 +851,9 @@ static inline void safe_write_entry(void
* then writing the high word before the low word. */
BUILD_BUG_ON(sizeof (shadow_l1e_t) != 2 * sizeof (unsigned long));
d[0] = 0;
+ wmb();
d[1] = s[1];
+ wmb();
d[0] = s[0];
#else
/* In 32-bit and 64-bit, sizeof(pte) == sizeof(ulong) == 1 word,
diff -r 93314655b16f -r 1d83974d08b1 xen/arch/x86/x86_32/domain_page.c
--- a/xen/arch/x86/x86_32/domain_page.c Thu Dec 07 14:40:13 2006 +0000
+++ b/xen/arch/x86/x86_32/domain_page.c Thu Dec 07 14:57:14 2006 +0000
@@ -107,7 +107,7 @@ void *map_domain_page(unsigned long mfn)
spin_unlock(&cache->lock);
- cache->l1tab[idx] = l1e_from_pfn(mfn, __PAGE_HYPERVISOR);
+ l1e_write(&cache->l1tab[idx], l1e_from_pfn(mfn, __PAGE_HYPERVISOR));
out:
va = MAPCACHE_VIRT_START + (idx << PAGE_SHIFT);
@@ -147,7 +147,7 @@ void unmap_domain_page(void *va)
{
/* /First/, zap the PTE. */
ASSERT(l1e_get_pfn(cache->l1tab[hashent->idx]) == hashent->mfn);
- cache->l1tab[hashent->idx] = l1e_empty();
+ l1e_write(&cache->l1tab[hashent->idx], l1e_empty());
/* /Second/, mark as garbage. */
set_bit(hashent->idx, cache->garbage);
}
@@ -159,7 +159,7 @@ void unmap_domain_page(void *va)
else
{
/* /First/, zap the PTE. */
- cache->l1tab[idx] = l1e_empty();
+ l1e_write(&cache->l1tab[idx], l1e_empty());
/* /Second/, mark as garbage. */
set_bit(idx, cache->garbage);
}
@@ -229,7 +229,7 @@ void *map_domain_page_global(unsigned lo
pl2e = virt_to_xen_l2e(va);
pl1e = l2e_to_l1e(*pl2e) + l1_table_offset(va);
- *pl1e = l1e_from_pfn(mfn, __PAGE_HYPERVISOR);
+ l1e_write(pl1e, l1e_from_pfn(mfn, __PAGE_HYPERVISOR));
return (void *)va;
}
@@ -246,7 +246,7 @@ void unmap_domain_page_global(void *va)
/* /First/, we zap the PTE. */
pl2e = virt_to_xen_l2e(__va);
pl1e = l2e_to_l1e(*pl2e) + l1_table_offset(__va);
- *pl1e = l1e_empty();
+ l1e_write(pl1e, l1e_empty());
/* /Second/, we add to the garbage map. */
idx = (__va - IOREMAP_VIRT_START) >> PAGE_SHIFT;
diff -r 93314655b16f -r 1d83974d08b1 xen/arch/x86/x86_32/mm.c
--- a/xen/arch/x86/x86_32/mm.c Thu Dec 07 14:40:13 2006 +0000
+++ b/xen/arch/x86/x86_32/mm.c Thu Dec 07 14:57:14 2006 +0000
@@ -99,11 +99,12 @@ void __init paging_init(void)
{
if ( (pg = alloc_domheap_pages(NULL, PAGETABLE_ORDER, 0)) == NULL )
panic("Not enough memory to bootstrap Xen.\n");
- idle_pg_table_l2[l2_linear_offset(RDWR_MPT_VIRT_START) + i] =
- l2e_from_page(pg, PAGE_HYPERVISOR | _PAGE_PSE);
+ l2e_write(&idle_pg_table_l2[l2_linear_offset(RDWR_MPT_VIRT_START) + i],
+ l2e_from_page(pg, PAGE_HYPERVISOR | _PAGE_PSE));
/* NB. Cannot be GLOBAL as shadow_mode_translate reuses this area. */
- idle_pg_table_l2[l2_linear_offset(RO_MPT_VIRT_START) + i] =
- l2e_from_page(pg, (__PAGE_HYPERVISOR | _PAGE_PSE) & ~_PAGE_RW);
+ l2e_write(&idle_pg_table_l2[l2_linear_offset(RO_MPT_VIRT_START) + i],
+ l2e_from_page(
+ pg, (__PAGE_HYPERVISOR | _PAGE_PSE) & ~_PAGE_RW));
}
/* Fill with an obvious debug pattern. */
@@ -115,8 +116,8 @@ void __init paging_init(void)
{
ioremap_pt = alloc_xenheap_page();
clear_page(ioremap_pt);
- idle_pg_table_l2[l2_linear_offset(IOREMAP_VIRT_START) + i] =
- l2e_from_page(virt_to_page(ioremap_pt), __PAGE_HYPERVISOR);
+ l2e_write(&idle_pg_table_l2[l2_linear_offset(IOREMAP_VIRT_START) + i],
+ l2e_from_page(virt_to_page(ioremap_pt), __PAGE_HYPERVISOR));
}
}
@@ -125,10 +126,10 @@ void __init setup_idle_pagetable(void)
int i;
for ( i = 0; i < PDPT_L2_ENTRIES; i++ )
- idle_pg_table_l2[l2_linear_offset(PERDOMAIN_VIRT_START) + i] =
- l2e_from_page(virt_to_page(idle_vcpu[0]->domain->
- arch.mm_perdomain_pt) + i,
- __PAGE_HYPERVISOR);
+ l2e_write(&idle_pg_table_l2[l2_linear_offset(PERDOMAIN_VIRT_START)+i],
+ l2e_from_page(virt_to_page(idle_vcpu[0]->domain->
+ arch.mm_perdomain_pt) + i,
+ __PAGE_HYPERVISOR));
}
void __init zap_low_mappings(l2_pgentry_t *base)
@@ -136,14 +137,16 @@ void __init zap_low_mappings(l2_pgentry_
int i;
u32 addr;
- for (i = 0; ; i++) {
- addr = (i << L2_PAGETABLE_SHIFT);
- if (addr >= HYPERVISOR_VIRT_START)
+ for ( i = 0; ; i++ )
+ {
+ addr = i << L2_PAGETABLE_SHIFT;
+ if ( addr >= HYPERVISOR_VIRT_START )
break;
- if (l2e_get_paddr(base[i]) != addr)
+ if ( l2e_get_paddr(base[i]) != addr )
continue;
- base[i] = l2e_empty();
- }
+ l2e_write(&base[i], l2e_empty());
+ }
+
flush_tlb_all_pge();
}
diff -r 93314655b16f -r 1d83974d08b1 xen/arch/x86/x86_64/mm.c
--- a/xen/arch/x86/x86_64/mm.c Thu Dec 07 14:40:13 2006 +0000
+++ b/xen/arch/x86/x86_64/mm.c Thu Dec 07 14:57:14 2006 +0000
@@ -59,7 +59,7 @@ l2_pgentry_t *virt_to_xen_l2e(unsigned l
{
pl3e = page_to_virt(alloc_xen_pagetable());
clear_page(pl3e);
- *pl4e = l4e_from_paddr(__pa(pl3e), __PAGE_HYPERVISOR);
+ l4e_write(pl4e, l4e_from_paddr(__pa(pl3e), __PAGE_HYPERVISOR));
}
pl3e = l4e_to_l3e(*pl4e) + l3_table_offset(v);
@@ -67,7 +67,7 @@ l2_pgentry_t *virt_to_xen_l2e(unsigned l
{
pl2e = page_to_virt(alloc_xen_pagetable());
clear_page(pl2e);
- *pl3e = l3e_from_paddr(__pa(pl2e), __PAGE_HYPERVISOR);
+ l3e_write(pl3e, l3e_from_paddr(__pa(pl2e), __PAGE_HYPERVISOR));
}
pl2e = l3e_to_l2e(*pl3e) + l2_table_offset(v);
@@ -85,8 +85,8 @@ void __init paging_init(void)
if ( (l2_pg = alloc_domheap_page(NULL)) == NULL )
goto nomem;
l3_ro_mpt = clear_page(page_to_virt(l2_pg));
- idle_pg_table[l4_table_offset(RO_MPT_VIRT_START)] =
- l4e_from_page(l2_pg, __PAGE_HYPERVISOR | _PAGE_USER);
+ l4e_write(&idle_pg_table[l4_table_offset(RO_MPT_VIRT_START)],
+ l4e_from_page(l2_pg, __PAGE_HYPERVISOR | _PAGE_USER));
/*
* Allocate and map the machine-to-phys table.
@@ -111,18 +111,19 @@ void __init paging_init(void)
goto nomem;
va = RO_MPT_VIRT_START + (i << L2_PAGETABLE_SHIFT);
l2_ro_mpt = clear_page(page_to_virt(l2_pg));
- l3_ro_mpt[l3_table_offset(va)] =
- l3e_from_page(l2_pg, __PAGE_HYPERVISOR | _PAGE_USER);
+ l3e_write(&l3_ro_mpt[l3_table_offset(va)],
+ l3e_from_page(l2_pg, __PAGE_HYPERVISOR | _PAGE_USER));
l2_ro_mpt += l2_table_offset(va);
}
/* NB. Cannot be GLOBAL as shadow_mode_translate reuses this area. */
- *l2_ro_mpt++ = l2e_from_page(
- l1_pg, /*_PAGE_GLOBAL|*/_PAGE_PSE|_PAGE_USER|_PAGE_PRESENT);
+ l2e_write(l2_ro_mpt, l2e_from_page(
+ l1_pg, /*_PAGE_GLOBAL|*/_PAGE_PSE|_PAGE_USER|_PAGE_PRESENT));
+ l2_ro_mpt++;
}
/* Set up linear page table mapping. */
- idle_pg_table[l4_table_offset(LINEAR_PT_VIRT_START)] =
- l4e_from_paddr(__pa(idle_pg_table), __PAGE_HYPERVISOR);
+ l4e_write(&idle_pg_table[l4_table_offset(LINEAR_PT_VIRT_START)],
+ l4e_from_paddr(__pa(idle_pg_table), __PAGE_HYPERVISOR));
return;
nomem:
@@ -132,15 +133,15 @@ void __init setup_idle_pagetable(void)
void __init setup_idle_pagetable(void)
{
/* Install per-domain mappings for idle domain. */
- idle_pg_table[l4_table_offset(PERDOMAIN_VIRT_START)] =
- l4e_from_page(
- virt_to_page(idle_vcpu[0]->domain->arch.mm_perdomain_l3),
- __PAGE_HYPERVISOR);
+ l4e_write(&idle_pg_table[l4_table_offset(PERDOMAIN_VIRT_START)],
+ l4e_from_page(
+ virt_to_page(idle_vcpu[0]->domain->arch.mm_perdomain_l3),
+ __PAGE_HYPERVISOR));
}
void __init zap_low_mappings(void)
{
- idle_pg_table[0] = l4e_empty();
+ l4e_write(&idle_pg_table[0], l4e_empty());
flush_tlb_all_pge();
}
diff -r 93314655b16f -r 1d83974d08b1 xen/include/asm-x86/page.h
--- a/xen/include/asm-x86/page.h Thu Dec 07 14:40:13 2006 +0000
+++ b/xen/include/asm-x86/page.h Thu Dec 07 14:57:14 2006 +0000
@@ -33,9 +33,18 @@
/* Write a pte atomically to memory. */
#define l1e_write_atomic(l1ep, l1e) pte_write_atomic(l1ep, l1e_get_intpte(l1e))
-#define l2e_write_atomic(l2ep, l2e) pte_write_atomic(l2ep, l1e_get_intpte(l2e))
-#define l3e_write_atomic(l3ep, l3e) pte_write_atomic(l3ep, l1e_get_intpte(l3e))
-#define l4e_write_atomic(l4ep, l4e) pte_write_atomic(l4ep, l1e_get_intpte(l4e))
+#define l2e_write_atomic(l2ep, l2e) pte_write_atomic(l2ep, l2e_get_intpte(l2e))
+#define l3e_write_atomic(l3ep, l3e) pte_write_atomic(l3ep, l3e_get_intpte(l3e))
+#define l4e_write_atomic(l4ep, l4e) pte_write_atomic(l4ep, l4e_get_intpte(l4e))
+
+/*
+ * Write a pte safely but non-atomically to memory.
+ * The PTE may become temporarily not-present during the update.
+ */
+#define l1e_write(l1ep, l1e) pte_write(l1ep, l1e_get_intpte(l1e))
+#define l2e_write(l2ep, l2e) pte_write(l2ep, l2e_get_intpte(l2e))
+#define l3e_write(l3ep, l3e) pte_write(l3ep, l3e_get_intpte(l3e))
+#define l4e_write(l4ep, l4e) pte_write(l4ep, l4e_get_intpte(l4e))
/* Get direct integer representation of a pte's contents (intpte_t). */
#define l1e_get_intpte(x) ((x).l1)
diff -r 93314655b16f -r 1d83974d08b1 xen/include/asm-x86/x86_32/page-2level.h
--- a/xen/include/asm-x86/x86_32/page-2level.h Thu Dec 07 14:40:13 2006 +0000
+++ b/xen/include/asm-x86/x86_32/page-2level.h Thu Dec 07 14:57:14 2006 +0000
@@ -29,7 +29,8 @@ typedef l2_pgentry_t root_pgentry_t;
#endif /* !__ASSEMBLY__ */
#define pte_read_atomic(ptep) (*(intpte_t *)(ptep))
-#define pte_write_atomic(ptep, pte) (*(intpte_t *)(ptep)) = (pte))
+#define pte_write_atomic(ptep, pte) ((*(intpte_t *)(ptep)) = (pte))
+#define pte_write(ptep, pte) ((*(intpte_t *)(ptep)) = (pte))
/* root table */
#define root_get_pfn l2e_get_pfn
diff -r 93314655b16f -r 1d83974d08b1 xen/include/asm-x86/x86_32/page-3level.h
--- a/xen/include/asm-x86/x86_32/page-3level.h Thu Dec 07 14:40:13 2006 +0000
+++ b/xen/include/asm-x86/x86_32/page-3level.h Thu Dec 07 14:57:14 2006 +0000
@@ -48,6 +48,13 @@ typedef l3_pgentry_t root_pgentry_t;
while ( (__npte = cmpxchg((intpte_t *)(ptep), __pte, (pte))) != __pte ) \
__pte = __npte; \
} while ( 0 )
+#define pte_write(ptep, pte) do { \
+ *((u32 *)(ptep)+0) = 0; \
+ wmb(); \
+ *((u32 *)(ptep)+1) = (pte) >> 32; \
+ wmb(); \
+ *((u32 *)(ptep)+0) = (pte) >> 0; \
+} while ( 0 )
/* root table */
#define root_get_pfn l3e_get_pfn
diff -r 93314655b16f -r 1d83974d08b1 xen/include/asm-x86/x86_64/page.h
--- a/xen/include/asm-x86/x86_64/page.h Thu Dec 07 14:40:13 2006 +0000
+++ b/xen/include/asm-x86/x86_64/page.h Thu Dec 07 14:57:14 2006 +0000
@@ -44,7 +44,8 @@ typedef l4_pgentry_t root_pgentry_t;
#endif /* !__ASSEMBLY__ */
#define pte_read_atomic(ptep) (*(intpte_t *)(ptep))
-#define pte_write_atomic(ptep, pte) (*(intpte_t *)(ptep)) = (pte))
+#define pte_write_atomic(ptep, pte) ((*(intpte_t *)(ptep)) = (pte))
+#define pte_write(ptep, pte) ((*(intpte_t *)(ptep)) = (pte))
/* Given a virtual address, get an entry offset into a linear page table. */
#define l1_linear_offset(_a) (((_a) & VADDR_MASK) >> L1_PAGETABLE_SHIFT)
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