source: patches/linux-2.6.20.1-mips_fixes-1.patch@ 686949f

.6.20.1/arch/mips/kernel/Makefile

@@ -56 +56 @@
 obj-$(CONFIG_64BIT)             += scall64-64.o
 obj-$(CONFIG_BINFMT_IRIX)       += binfmt_irix.o
 obj-$(CONFIG_MIPS32_COMPAT)     += linux32.o ptrace32.o signal32.o
-obj-$(CONFIG_MIPS32_N32)        += binfmt_elfn32.o scall64-n32.o signal_n32.o
+obj-$(CONFIG_MIPS32_N32)        += binfmt_elfn32.o scall64-n32.o ptrace32.o signal_n32.o
 obj-$(CONFIG_MIPS32_O32)        += binfmt_elfo32.o scall64-o32.o
 
 obj-$(CONFIG_KGDB)              += gdb-low.o gdb-stub.o

.6.20.1/include/asm-mips/mach-cobalt/ide.h

@@ +1 @@
+
+/*
+ * PIO "in" transfers can cause D-cache lines to be allocated
+ * to the data being read. If the target is the page cache then
+ * the kernel can create a user space mapping of the same page
+ * without flushing it from the D-cache. This has large potential
+ * to create cache aliases. The Cobalts seem to trigger this
+ * problem easily.
+ *
+ * MIPs doesn't have a flush_dcache_range() so we roll
+ * our own.
+ *
+ * -- pdh
+ */
+
+#define MAX_HWIFS                      2
+
+#include <asm/r4kcache.h>
+
+static inline void __flush_dcache(void)
+{
+       unsigned long dc_size, dc_line, addr, end;
+
+       dc_size = current_cpu_data.dcache.ways << current_cpu_data.dcache.waybit;
+       dc_line = current_cpu_data.dcache.linesz;
+
+       addr = CKSEG0;
+       end = addr + dc_size;
+
+       for (; addr < end; addr += dc_line)
+               flush_dcache_line_indexed(addr);
+}
+
+static inline void __flush_dcache_range(unsigned long start, unsigned long end)
+{
+       unsigned long dc_size, dc_line, addr;
+
+       dc_size = current_cpu_data.dcache.ways << current_cpu_data.dcache.waybit;
+       dc_line = current_cpu_data.dcache.linesz;
+
+       addr = start & ~(dc_line - 1);
+       end += dc_line - 1;
+
+       if (end - addr < dc_size)
+               for (; addr < end; addr += dc_line)
+                       flush_dcache_line(addr);
+       else
+               __flush_dcache();
+}
+
+static inline void __ide_insw(unsigned long port, void *addr, unsigned int count)
+{
+       insw(port, addr, count);
+
+       __flush_dcache_range((unsigned long) addr, (unsigned long) addr + count * 2);
+}
+
+static inline void __ide_insl(unsigned long port, void *addr, unsigned int count)
+{
+       insl(port, addr, count);
+
+       __flush_dcache_range((unsigned long) addr, (unsigned long) addr + count * 4);
+}
+
+static inline void __ide_mm_insw(volatile void __iomem *port, void *addr, unsigned int count)
+{
+       readsw(port, addr, count);
+
+       __flush_dcache_range((unsigned long) addr, (unsigned long) addr + count * 2);
+}
+
+static inline void __ide_mm_insl(volatile void __iomem *port, void *addr, unsigned int count)
+{
+       readsl(port, addr, count);
+
+       __flush_dcache_range((unsigned long) addr, (unsigned long) addr + count * 4);
+}
+
+#define insw                   __ide_insw
+#define insl                   __ide_insl
+
+#define __ide_mm_outsw         writesw
+#define __ide_mm_outsl         writesl