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authorMatias Zabaljauregui <matias.zabaljauregui@cern.ch>2007-10-22 11:03:33 +1000
committerRusty Russell <rusty@rustcorp.com.au>2007-10-23 15:49:53 +1000
commitdf29f43e650df29456804dabdb2611de914e7c0f (patch)
tree2f8de4a2f1b7c4141e710123fc86db266f507d83 /drivers/lguest/lg.h
parent47aee45ae3c708ab678e09abfba0efaf6ca0e87a (diff)
Pagetables to use normal kernel types
This is my first step in the migration of page_tables.c to the kernel types and functions/macros (2.6.23-rc3). Seems to be working OK. Signed-off-by: Matias Zabaljauregui <matias.zabaljauregui@cern.ch> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest/lg.h')
-rw-r--r--drivers/lguest/lg.h45
1 files changed, 8 insertions, 37 deletions
diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h
index c2557cfd86c..dc15b88208f 100644
--- a/drivers/lguest/lg.h
+++ b/drivers/lguest/lg.h
@@ -28,45 +28,10 @@ struct lguest_dma_info
u8 interrupt; /* 0 when not registered */
};
-/*H:310 The page-table code owes a great debt of gratitude to Andi Kleen. He
- * reviewed the original code which used "u32" for all page table entries, and
- * insisted that it would be far clearer with explicit typing. I thought it
- * was overkill, but he was right: it is much clearer than it was before.
- *
- * We have separate types for the Guest's ptes & pgds and the shadow ptes &
- * pgds. There's already a Linux type for these (pte_t and pgd_t) but they
- * change depending on kernel config options (PAE). */
-
-/* Each entry is identical: lower 12 bits of flags and upper 20 bits for the
- * "page frame number" (0 == first physical page, etc). They are different
- * types so the compiler will warn us if we mix them improperly. */
-typedef union {
- struct { unsigned flags:12, pfn:20; };
- struct { unsigned long val; } raw;
-} spgd_t;
-typedef union {
- struct { unsigned flags:12, pfn:20; };
- struct { unsigned long val; } raw;
-} spte_t;
-typedef union {
- struct { unsigned flags:12, pfn:20; };
- struct { unsigned long val; } raw;
-} gpgd_t;
-typedef union {
- struct { unsigned flags:12, pfn:20; };
- struct { unsigned long val; } raw;
-} gpte_t;
-
-/* We have two convenient macros to convert a "raw" value as handed to us by
- * the Guest into the correct Guest PGD or PTE type. */
-#define mkgpte(_val) ((gpte_t){.raw.val = _val})
-#define mkgpgd(_val) ((gpgd_t){.raw.val = _val})
-/*:*/
-
struct pgdir
{
unsigned long cr3;
- spgd_t *pgdir;
+ pgd_t *pgdir;
};
/* We have two pages shared with guests, per cpu. */
@@ -157,6 +122,12 @@ int lguest_address_ok(const struct lguest *lg,
unsigned long addr, unsigned long len);
int run_guest(struct lguest *lg, unsigned long __user *user);
+/* Helper macros to obtain the first 12 or the last 20 bits, this is only the
+ * first step in the migration to the kernel types. pte_pfn is already defined
+ * in the kernel. */
+#define pgd_flags(x) (pgd_val(x) & ~PAGE_MASK)
+#define pte_flags(x) (pte_val(x) & ~PAGE_MASK)
+#define pgd_pfn(x) (pgd_val(x) >> PAGE_SHIFT)
/* interrupts_and_traps.c: */
void maybe_do_interrupt(struct lguest *lg);
@@ -187,7 +158,7 @@ void guest_set_pmd(struct lguest *lg, unsigned long cr3, u32 i);
void guest_pagetable_clear_all(struct lguest *lg);
void guest_pagetable_flush_user(struct lguest *lg);
void guest_set_pte(struct lguest *lg, unsigned long cr3,
- unsigned long vaddr, gpte_t val);
+ unsigned long vaddr, pte_t val);
void map_switcher_in_guest(struct lguest *lg, struct lguest_pages *pages);
int demand_page(struct lguest *info, unsigned long cr2, int errcode);
void pin_page(struct lguest *lg, unsigned long vaddr);