patch-2.2.18 linux/drivers/pci/compat.c

• Lines: 32
• Date: Fri Sep 8 17:05:10 2000
• Orig file: v2.2.17/drivers/pci/compat.c
• Orig date: Fri Apr 21 12:46:24 2000

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/pci/compat.c linux/drivers/pci/compat.c
@@ -41,3 +41,31 @@
 		}
 	return PCIBIOS_DEVICE_NOT_FOUND;
 }
+
+/* 2.4 compatibility */
+
+unsigned long pci_resource_len (struct pci_dev *dev, int n_base)
+{
+        u32 l, sz;
+        int reg = PCI_BASE_ADDRESS_0 + (n_base << 2);
+
+        /* XXX temporarily disable I/O and memory decoding for this device? */
+
+        pci_read_config_dword (dev, reg, &l);
+        if (l == 0xffffffff)
+                return 0;
+
+        pci_write_config_dword (dev, reg, ~0);
+        pci_read_config_dword (dev, reg, &sz);
+        pci_write_config_dword (dev, reg, l);
+
+        if (!sz || sz == 0xffffffff)
+                return 0;
+        if ((l & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_MEMORY) {
+                sz = ~(sz & PCI_BASE_ADDRESS_MEM_MASK);
+        } else {
+                sz = ~(sz & PCI_BASE_ADDRESS_IO_MASK) & 0xffff;
+        }
+
+        return sz + 1;
+}