ChangeSet 1.2218, 2005/03/16 09:37:39-08:00, [EMAIL PROTECTED]
[IA64] override for pgd_addr_end to step around holes
Every user region has a hole in the middle where we don't have
enough bits in pgd+pmd+pte so pgd_addr_end needs some extra math
to compute the virtual address base of the next pgd entry.
Thanks to Dave Miller for pointing me in the right direction.
Signed-off-by: Tony Luck <[EMAIL PROTECTED]>
pgtable.h | 17 +++++++++++++++++
1 files changed, 17 insertions(+)
diff -Nru a/include/asm-ia64/pgtable.h b/include/asm-ia64/pgtable.h
--- a/include/asm-ia64/pgtable.h 2005-03-17 11:06:29 -08:00
+++ b/include/asm-ia64/pgtable.h 2005-03-17 11:06:29 -08:00
@@ -550,6 +550,23 @@
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
#define __HAVE_ARCH_PTE_SAME
#define __HAVE_ARCH_PGD_OFFSET_GATE
+
+/*
+ * Override for pgd_addr_end() to deal with the virtual address space holes
+ * in each region. Virtual address bits are used like this:
+ * +--------+------+--------+-----+-----+--------+
+ * | pgdhi3 | rsvd | pgdlow | pmd | pte | offset |
+ * +--------+------+--------+-----+-----+--------+
+ * The high bit of 'pgdlow' must be sign extended across the 'rsvd' bits.
+ */
+#define IA64_PGD_SIGNEXTEND (PGDIR_SIZE << (PAGE_SHIFT-7))
+#define pgd_addr_end(addr, end)
\
+({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \
+ if (__boundary & IA64_PGD_SIGNEXTEND) \
+ __boundary |= (RGN_SIZE - 1) & ~(IA64_PGD_SIGNEXTEND-1);\
+ (__boundary - 1 < (end) - 1)? __boundary: (end); \
+})
+
#include <asm-generic/pgtable-nopud.h>
#include <asm-generic/pgtable.h>
-
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