Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/include/asm-mips/pgtable-bits.h b/include/asm-mips/pgtable-bits.h
new file mode 100644
index 0000000..3aad751
--- /dev/null
+++ b/include/asm-mips/pgtable-bits.h
@@ -0,0 +1,149 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994 - 2002 by Ralf Baechle
+ * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
+ * Copyright (C) 2002 Maciej W. Rozycki
+ */
+#ifndef _ASM_PGTABLE_BITS_H
+#define _ASM_PGTABLE_BITS_H
+
+#include <linux/config.h>
+
+/*
+ * Note that we shift the lower 32bits of each EntryLo[01] entry
+ * 6 bits to the left. That way we can convert the PFN into the
+ * physical address by a single 'and' operation and gain 6 additional
+ * bits for storing information which isn't present in a normal
+ * MIPS page table.
+ *
+ * Similar to the Alpha port, we need to keep track of the ref
+ * and mod bits in software. We have a software "yeah you can read
+ * from this page" bit, and a hardware one which actually lets the
+ * process read from the page. On the same token we have a software
+ * writable bit and the real hardware one which actually lets the
+ * process write to the page, this keeps a mod bit via the hardware
+ * dirty bit.
+ *
+ * Certain revisions of the R4000 and R5000 have a bug where if a
+ * certain sequence occurs in the last 3 instructions of an executable
+ * page, and the following page is not mapped, the cpu can do
+ * unpredictable things. The code (when it is written) to deal with
+ * this problem will be in the update_mmu_cache() code for the r4k.
+ */
+#if defined(CONFIG_CPU_MIPS32) && defined(CONFIG_64BIT_PHYS_ADDR)
+
+#define _PAGE_PRESENT (1<<6) /* implemented in software */
+#define _PAGE_READ (1<<7) /* implemented in software */
+#define _PAGE_WRITE (1<<8) /* implemented in software */
+#define _PAGE_ACCESSED (1<<9) /* implemented in software */
+#define _PAGE_MODIFIED (1<<10) /* implemented in software */
+#define _PAGE_FILE (1<<10) /* set:pagecache unset:swap */
+
+#define _PAGE_R4KBUG (1<<0) /* workaround for r4k bug */
+#define _PAGE_GLOBAL (1<<0)
+#define _PAGE_VALID (1<<1)
+#define _PAGE_SILENT_READ (1<<1) /* synonym */
+#define _PAGE_DIRTY (1<<2) /* The MIPS dirty bit */
+#define _PAGE_SILENT_WRITE (1<<2)
+#define _CACHE_MASK (7<<3)
+
+/* MIPS32 defines only values 2 and 3. The rest are implementation
+ * dependent.
+ */
+#define _CACHE_UNCACHED (2<<3)
+#define _CACHE_CACHABLE_NONCOHERENT (3<<3)
+#define _CACHE_CACHABLE_COW (3<<3) /* Au1x */
+
+#else
+
+#define _PAGE_PRESENT (1<<0) /* implemented in software */
+#define _PAGE_READ (1<<1) /* implemented in software */
+#define _PAGE_WRITE (1<<2) /* implemented in software */
+#define _PAGE_ACCESSED (1<<3) /* implemented in software */
+#define _PAGE_MODIFIED (1<<4) /* implemented in software */
+#define _PAGE_FILE (1<<4) /* set:pagecache unset:swap */
+
+#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
+
+#define _PAGE_GLOBAL (1<<8)
+#define _PAGE_VALID (1<<9)
+#define _PAGE_SILENT_READ (1<<9) /* synonym */
+#define _PAGE_DIRTY (1<<10) /* The MIPS dirty bit */
+#define _PAGE_SILENT_WRITE (1<<10)
+#define _CACHE_UNCACHED (1<<11)
+#define _CACHE_MASK (1<<11)
+#define _CACHE_CACHABLE_NONCOHERENT 0
+
+#else
+#define _PAGE_R4KBUG (1<<5) /* workaround for r4k bug */
+#define _PAGE_GLOBAL (1<<6)
+#define _PAGE_VALID (1<<7)
+#define _PAGE_SILENT_READ (1<<7) /* synonym */
+#define _PAGE_DIRTY (1<<8) /* The MIPS dirty bit */
+#define _PAGE_SILENT_WRITE (1<<8)
+#define _CACHE_MASK (7<<9)
+
+#ifdef CONFIG_CPU_SB1
+
+/* No penalty for being coherent on the SB1, so just
+ use it for "noncoherent" spaces, too. Shouldn't hurt. */
+
+#define _CACHE_UNCACHED (2<<9)
+#define _CACHE_CACHABLE_COW (5<<9)
+#define _CACHE_CACHABLE_NONCOHERENT (5<<9)
+#define _CACHE_UNCACHED_ACCELERATED (7<<9)
+
+#elif defined(CONFIG_CPU_RM9000)
+
+#define _CACHE_WT (0 << 9)
+#define _CACHE_WTWA (1 << 9)
+#define _CACHE_UC_B (2 << 9)
+#define _CACHE_WB (3 << 9)
+#define _CACHE_CWBEA (4 << 9)
+#define _CACHE_CWB (5 << 9)
+#define _CACHE_UCNB (6 << 9)
+#define _CACHE_FPC (7 << 9)
+
+#define _CACHE_UNCACHED _CACHE_UC_B
+#define _CACHE_CACHABLE_NONCOHERENT _CACHE_WB
+
+#else
+
+#define _CACHE_CACHABLE_NO_WA (0<<9) /* R4600 only */
+#define _CACHE_CACHABLE_WA (1<<9) /* R4600 only */
+#define _CACHE_UNCACHED (2<<9) /* R4[0246]00 */
+#define _CACHE_CACHABLE_NONCOHERENT (3<<9) /* R4[0246]00 */
+#define _CACHE_CACHABLE_CE (4<<9) /* R4[04]00MC only */
+#define _CACHE_CACHABLE_COW (5<<9) /* R4[04]00MC only */
+#define _CACHE_CACHABLE_CUW (6<<9) /* R4[04]00MC only */
+#define _CACHE_UNCACHED_ACCELERATED (7<<9) /* R10000 only */
+
+#endif
+#endif
+#endif /* defined(CONFIG_CPU_MIPS32) && defined(CONFIG_64BIT_PHYS_ADDR) */
+
+#define __READABLE (_PAGE_READ | _PAGE_SILENT_READ | _PAGE_ACCESSED)
+#define __WRITEABLE (_PAGE_WRITE | _PAGE_SILENT_WRITE | _PAGE_MODIFIED)
+
+#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED | _CACHE_MASK)
+
+#ifdef CONFIG_MIPS_UNCACHED
+#define PAGE_CACHABLE_DEFAULT _CACHE_UNCACHED
+#elif defined(CONFIG_DMA_NONCOHERENT)
+#define PAGE_CACHABLE_DEFAULT _CACHE_CACHABLE_NONCOHERENT
+#elif defined(CONFIG_CPU_RM9000)
+#define PAGE_CACHABLE_DEFAULT _CACHE_CWB
+#else
+#define PAGE_CACHABLE_DEFAULT _CACHE_CACHABLE_COW
+#endif
+
+#if defined(CONFIG_CPU_MIPS32) && defined(CONFIG_64BIT_PHYS_ADDR)
+#define CONF_CM_DEFAULT (PAGE_CACHABLE_DEFAULT >> 3)
+#else
+#define CONF_CM_DEFAULT (PAGE_CACHABLE_DEFAULT >> 9)
+#endif
+
+#endif /* _ASM_PGTABLE_BITS_H */