[PATCH x86 for review II] [28/39] i386: fix size_or_mask and size_and_mask

Andi Kleen
2007-02-12T07:38:58Z

From: "Andreas Herrmann" <andreas.herrmann3@amd.com>
mtrr: fix size_or_mask and size_and_mask

This fixes two bugs in /proc/mtrr interface:
o If physical address size crosses the 44 bit boundary
size_or_mask is evaluated wrong.
o size_and_mask limits width of physical base
address for an MTRR to be less than 44 bits.

TBD: later patch had one more change, but I think that was bogus.
TBD: need to double check

Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Signed-off-by: Andi Kleen <ak@suse.de>

---
arch/i386/kernel/cpu/mtrr/main.c | 6 +++---
arch/i386/kernel/cpu/mtrr/mtrr.h | 2 +-
2 files changed, 4 insertions(+), 4 deletions(-)

Index: linux/arch/i386/kernel/cpu/mtrr/main.c
===================================================================
--- linux.orig/arch/i386/kernel/cpu/mtrr/main.c
+++ linux/arch/i386/kernel/cpu/mtrr/main.c
@@ -50,7 +50,7 @@ u32 num_var_ranges = 0;
unsigned int *usage_table;
static DEFINE_MUTEX(mtrr_mutex);

-u32 size_or_mask, size_and_mask;
+u64 size_or_mask, size_and_mask;

static struct mtrr_ops * mtrr_ops[X86_VENDOR_NUM] = {};

@@ -662,8 +662,8 @@ void __init mtrr_bp_init(void)
boot_cpu_data.x86_mask == 0x4))
phys_addr = 36;

- size_or_mask = ~((1 << (phys_addr - PAGE_SHIFT)) - 1);
- size_and_mask = ~size_or_mask & 0xfff00000;
+ size_or_mask = ~((1ULL << (phys_addr - PAGE_SHIFT)) - 1);
+ size_and_mask = ~size_or_mask & 0xfffff00000ULL;
} else if (boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR &&
boot_cpu_data.x86 == 6) {
/* VIA C* family have Intel style MTRRs, but
Index: linux/arch/i386/kernel/cpu/mtrr/mtrr.h
===================================================================
--- linux.orig/arch/i386/kernel/cpu/mtrr/mtrr.h
+++ linux/arch/i386/kernel/cpu/mtrr/mtrr.h
@@ -84,7 +84,7 @@ void get_mtrr_state(void);

extern void set_mtrr_ops(struct mtrr_ops * ops);

-extern u32 size_or_mask, size_and_mask;
+extern u64 size_or_mask, size_and_mask;
extern struct mtrr_ops * mtrr_if;

#define is_cpu(vnd) (mtrr_if && mtrr_if->vendor == X86_VENDOR_##vnd)