[PATCH] i386: Some additional chipset register values validation.

On i945, a mmconfig range hitting the f0000000-ffffffff zone conflicts
with the APIC registers and others.  Consider it invalid.

On E7520, values 0000 and f000 for the window register are defined
invalid in the documentation.

I haven't seen a bios use these values, but who trusts biosen these
days?

Signed-off-by: Olivier Galibert <galibert@pobox.com>
Signed-off-by: Andi Kleen <ak@suse.de>
 arch/i386/pci/mmconfig-shared.c |   25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/arch/i386/pci/mmconfig-shared.c b/arch/i386/pci/mmconfig-shared.c
index 747d8c6..c7cabee 100644 (file)
--- a/arch/i386/pci/mmconfig-shared.c
+++ b/arch/i386/pci/mmconfig-shared.c
@@ -60,14 +60,19 @@ static const char __init *pci_mmcfg_e7520(void)
        u32 win;
        pci_conf1_read(0, 0, PCI_DEVFN(0,0), 0xce, 2, &win);
 
-       pci_mmcfg_config_num = 1;
-       pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL);
-       if (!pci_mmcfg_config)
-               return NULL;
-       pci_mmcfg_config[0].address = (win & 0xf000) << 16;
-       pci_mmcfg_config[0].pci_segment = 0;
-       pci_mmcfg_config[0].start_bus_number = 0;
-       pci_mmcfg_config[0].end_bus_number = 255;
+       win = win & 0xf000;
+       if(win == 0x0000 || win == 0xf000)
+               pci_mmcfg_config_num = 0;
+       else {
+               pci_mmcfg_config_num = 1;
+               pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL);
+               if (!pci_mmcfg_config)
+                       return NULL;
+               pci_mmcfg_config[0].address = win << 16;
+               pci_mmcfg_config[0].pci_segment = 0;
+               pci_mmcfg_config[0].start_bus_number = 0;
+               pci_mmcfg_config[0].end_bus_number = 255;
+       }
 
        return "Intel Corporation E7520 Memory Controller Hub";
 }
@@ -108,6 +113,10 @@ static const char __init *pci_mmcfg_intel_945(void)
        if ((pciexbar & mask) & 0x0fffffffU)
                pci_mmcfg_config_num = 0;
 
+       /* Don't hit the APIC registers and their friends */
+       if ((pciexbar & mask) >= 0xf0000000U)
+               pci_mmcfg_config_num = 0;
+
        if (pci_mmcfg_config_num) {
                pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL);
                if (!pci_mmcfg_config)