Linux-2.6.12-rc2v2.6.12-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!

5 files changed, 481 insertions, 0 deletions

diff --git a/arch/m68knommu/mm/Makefile b/arch/m68knommu/mm/Makefile
new file mode 100644
index 000000000000..fc91f254f51b
--- /dev/null
+++ b/arch/m68knommu/mm/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the linux m68knommu specific parts of the memory manager.
+#
+
+obj-y += init.o fault.o memory.o kmap.o
diff --git a/arch/m68knommu/mm/fault.c b/arch/m68knommu/mm/fault.c
new file mode 100644
index 000000000000..6f6673cb5829
--- /dev/null
+++ b/arch/m68knommu/mm/fault.c
@@ -0,0 +1,57 @@
+/*
+ *  linux/arch/m68knommu/mm/fault.c
+ *
+ *  Copyright (C) 1998  D. Jeff Dionne <jeff@lineo.ca>,
+ *  Copyright (C) 2000  Lineo, Inc.  (www.lineo.com) 
+ *
+ *  Based on:
+ *
+ *  linux/arch/m68k/mm/fault.c
+ *
+ *  Copyright (C) 1995  Hamish Macdonald
+ */
+
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/ptrace.h>
+
+#include <asm/system.h>
+#include <asm/pgtable.h>
+
+extern void die_if_kernel(char *, struct pt_regs *, long);
+
+/*
+ * This routine handles page faults.  It determines the problem, and
+ * then passes it off to one of the appropriate routines.
+ *
+ * error_code:
+ *      bit 0 == 0 means no page found, 1 means protection fault
+ *      bit 1 == 0 means read, 1 means write
+ *
+ * If this routine detects a bad access, it returns 1, otherwise it
+ * returns 0.
+ */
+asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
+                              unsigned long error_code)
+{
+#ifdef DEBUG
+        printk (KERN_DEBUG "regs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld\n",
+                regs->sr, regs->pc, address, error_code);
+#endif
+
+        /*
+         * Oops. The kernel tried to access some bad page. We'll have to
+         * terminate things with extreme prejudice.
+         */
+        if ((unsigned long) address < PAGE_SIZE) {
+                printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
+        } else
+                printk(KERN_ALERT "Unable to handle kernel access");
+        printk(KERN_ALERT " at virtual address %08lx\n",address);
+        die_if_kernel("Oops", regs, error_code);
+        do_exit(SIGKILL);
+
+        return 1;
+}
+
diff --git a/arch/m68knommu/mm/init.c b/arch/m68knommu/mm/init.c
new file mode 100644
index 000000000000..89f0b554ffb7
--- /dev/null
+++ b/arch/m68knommu/mm/init.c
@@ -0,0 +1,231 @@
+/*
+ *  linux/arch/m68knommu/mm/init.c
+ *
+ *  Copyright (C) 1998  D. Jeff Dionne <jeff@lineo.ca>,
+ *                      Kenneth Albanowski <kjahds@kjahds.com>,
+ *  Copyright (C) 2000  Lineo, Inc.  (www.lineo.com) 
+ *
+ *  Based on:
+ *
+ *  linux/arch/m68k/mm/init.c
+ *
+ *  Copyright (C) 1995  Hamish Macdonald
+ *
+ *  JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com)
+ *  DEC/2000 -- linux 2.4 support <davidm@snapgear.com>
+ */
+
+#include <linux/config.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/init.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/bootmem.h>
+#include <linux/slab.h>
+
+#include <asm/setup.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/machdep.h>
+
+#undef DEBUG
+
+extern void die_if_kernel(char *,struct pt_regs *,long);
+extern void free_initmem(void);
+
+/*
+ * BAD_PAGE is the page that is used for page faults when linux
+ * is out-of-memory. Older versions of linux just did a
+ * do_exit(), but using this instead means there is less risk
+ * for a process dying in kernel mode, possibly leaving a inode
+ * unused etc..
+ *
+ * BAD_PAGETABLE is the accompanying page-table: it is initialized
+ * to point to BAD_PAGE entries.
+ *
+ * ZERO_PAGE is a special page that is used for zero-initialized
+ * data and COW.
+ */
+static unsigned long empty_bad_page_table;
+
+static unsigned long empty_bad_page;
+
+unsigned long empty_zero_page;
+
+extern unsigned long rom_length;
+
+void show_mem(void)
+{
+    unsigned long i;
+    int free = 0, total = 0, reserved = 0, shared = 0;
+    int cached = 0;
+
+    printk(KERN_INFO "\nMem-info:\n");
+    show_free_areas();
+    i = max_mapnr;
+    while (i-- > 0) {
+        total++;
+        if (PageReserved(mem_map+i))
+            reserved++;
+        else if (PageSwapCache(mem_map+i))
+            cached++;
+        else if (!page_count(mem_map+i))
+            free++;
+        else
+            shared += page_count(mem_map+i) - 1;
+    }
+    printk(KERN_INFO "%d pages of RAM\n",total);
+    printk(KERN_INFO "%d free pages\n",free);
+    printk(KERN_INFO "%d reserved pages\n",reserved);
+    printk(KERN_INFO "%d pages shared\n",shared);
+    printk(KERN_INFO "%d pages swap cached\n",cached);
+}
+
+extern unsigned long memory_start;
+extern unsigned long memory_end;
+
+/*
+ * paging_init() continues the virtual memory environment setup which
+ * was begun by the code in arch/head.S.
+ * The parameters are pointers to where to stick the starting and ending
+ * addresses of available kernel virtual memory.
+ */
+void paging_init(void)
+{
+        /*
+         * Make sure start_mem is page aligned, otherwise bootmem and
+         * page_alloc get different views of the world.
+         */
+#ifdef DEBUG
+        unsigned long start_mem = PAGE_ALIGN(memory_start);
+#endif
+        unsigned long end_mem   = memory_end & PAGE_MASK;
+
+#ifdef DEBUG
+        printk (KERN_DEBUG "start_mem is %#lx\nvirtual_end is %#lx\n",
+                start_mem, end_mem);
+#endif
+
+        /*
+         * Initialize the bad page table and bad page to point
+         * to a couple of allocated pages.
+         */
+        empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
+        empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
+        empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
+        memset((void *)empty_zero_page, 0, PAGE_SIZE);
+
+        /*
+         * Set up SFC/DFC registers (user data space).
+         */
+        set_fs (USER_DS);
+
+#ifdef DEBUG
+        printk (KERN_DEBUG "before free_area_init\n");
+
+        printk (KERN_DEBUG "free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
+                start_mem, end_mem);
+#endif
+
+        {
+                unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
+
+                zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
+                zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
+#ifdef CONFIG_HIGHMEM
+                zones_size[ZONE_HIGHMEM] = 0;
+#endif
+                free_area_init(zones_size);
+        }
+}
+
+void mem_init(void)
+{
+        int codek = 0, datak = 0, initk = 0;
+        unsigned long tmp;
+        extern char _etext, _stext, _sdata, _ebss, __init_begin, __init_end;
+        extern unsigned int _ramend, _rambase;
+        unsigned long len = _ramend - _rambase;
+        unsigned long start_mem = memory_start; /* DAVIDM - these must start at end of kernel */
+        unsigned long end_mem   = memory_end; /* DAVIDM - this must not include kernel stack at top */
+
+#ifdef DEBUG
+        printk(KERN_DEBUG "Mem_init: start=%lx, end=%lx\n", start_mem, end_mem);
+#endif
+
+        end_mem &= PAGE_MASK;
+        high_memory = (void *) end_mem;
+
+        start_mem = PAGE_ALIGN(start_mem);
+        max_mapnr = num_physpages = (((unsigned long) high_memory) - PAGE_OFFSET) >> PAGE_SHIFT;
+
+        /* this will put all memory onto the freelists */
+        totalram_pages = free_all_bootmem();
+
+        codek = (&_etext - &_stext) >> 10;
+        datak = (&_ebss - &_sdata) >> 10;
+        initk = (&__init_begin - &__init_end) >> 10;
+
+        tmp = nr_free_pages() << PAGE_SHIFT;
+        printk(KERN_INFO "Memory available: %luk/%luk RAM, %luk/%luk ROM (%dk kernel code, %dk data)\n",
+               tmp >> 10,
+               len >> 10,
+               (rom_length > 0) ? ((rom_length >> 10) - codek) : 0,
+               rom_length >> 10,
+               codek,
+               datak
+               );
+}
+
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+        int pages = 0;
+        for (; start < end; start += PAGE_SIZE) {
+                ClearPageReserved(virt_to_page(start));
+                set_page_count(virt_to_page(start), 1);
+                free_page(start);
+                totalram_pages++;
+                pages++;
+        }
+        printk (KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages);
+}
+#endif
+
+void
+free_initmem()
+{
+#ifdef CONFIG_RAMKERNEL
+        unsigned long addr;
+        extern char __init_begin, __init_end;
+        /*
+         * The following code should be cool even if these sections
+         * are not page aligned.
+         */
+        addr = PAGE_ALIGN((unsigned long)(&__init_begin));
+        /* next to check that the page we free is not a partial page */
+        for (; addr + PAGE_SIZE < (unsigned long)(&__init_end); addr +=PAGE_SIZE) {
+                ClearPageReserved(virt_to_page(addr));
+                set_page_count(virt_to_page(addr), 1);
+                free_page(addr);
+                totalram_pages++;
+        }
+        printk(KERN_NOTICE "Freeing unused kernel memory: %ldk freed (0x%x - 0x%x)\n",
+                        (addr - PAGE_ALIGN((long) &__init_begin)) >> 10,
+                        (int)(PAGE_ALIGN((unsigned long)(&__init_begin))),
+                        (int)(addr - PAGE_SIZE));
+#endif
+}
+
diff --git a/arch/m68knommu/mm/kmap.c b/arch/m68knommu/mm/kmap.c
new file mode 100644
index 000000000000..04213e1c1e57
--- /dev/null
+++ b/arch/m68knommu/mm/kmap.c
@@ -0,0 +1,56 @@
+/*
+ *  linux/arch/m68knommu/mm/kmap.c
+ *
+ *  Copyright (C) 2000 Lineo, <davidm@snapgear.com>
+ *  Copyright (C) 2000-2002 David McCullough <davidm@snapgear.com>
+ */
+
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+
+#include <asm/setup.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/io.h>
+#include <asm/system.h>
+
+#undef DEBUG
+
+/*
+ * Map some physical address range into the kernel address space.
+ */
+void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
+{
+        return (void *)physaddr;
+}
+
+/*
+ * Unmap a ioremap()ed region again.
+ */
+void iounmap(void *addr)
+{
+}
+
+/*
+ * __iounmap unmaps nearly everything, so be careful
+ * it doesn't free currently pointer/page tables anymore but it
+ * wans't used anyway and might be added later.
+ */
+void __iounmap(void *addr, unsigned long size)
+{
+}
+
+/*
+ * Set new cache mode for some kernel address space.
+ * The caller must push data for that range itself, if such data may already
+ * be in the cache.
+ */
+void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
+{
+}
diff --git a/arch/m68knommu/mm/memory.c b/arch/m68knommu/mm/memory.c
new file mode 100644
index 000000000000..0eef72915e61
--- /dev/null
+++ b/arch/m68knommu/mm/memory.c
@@ -0,0 +1,132 @@
+/*
+ *  linux/arch/m68knommu/mm/memory.c
+ *
+ *  Copyright (C) 1998  Kenneth Albanowski <kjahds@kjahds.com>,
+ *  Copyright (C) 1999-2002, Greg Ungerer (gerg@snapgear.com)
+ *
+ *  Based on:
+ *
+ *  linux/arch/m68k/mm/memory.c
+ *
+ *  Copyright (C) 1995  Hamish Macdonald
+ */
+
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+
+#include <asm/setup.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/traps.h>
+#include <asm/io.h>
+
+/*
+ * cache_clear() semantics: Clear any cache entries for the area in question,
+ * without writing back dirty entries first. This is useful if the data will
+ * be overwritten anyway, e.g. by DMA to memory. The range is defined by a
+ * _physical_ address.
+ */
+
+void cache_clear (unsigned long paddr, int len)
+{
+}
+
+
+/*
+ *      Define cache invalidate functions. The ColdFire 5407 is really
+ *      the only processor that needs to do some work here. Anything
+ *      that has separate data and instruction caches will be a problem.
+ */
+#ifdef CONFIG_M5407
+
+static __inline__ void cache_invalidate_lines(unsigned long paddr, int len)
+{
+        unsigned long   sset, eset;
+
+        sset = (paddr & 0x00000ff0);
+        eset = ((paddr + len) & 0x0000ff0) + 0x10;
+
+        __asm__ __volatile__ (
+                "nop\n\t"
+                "clrl   %%d0\n\t"
+                "1:\n\t"
+                "movel  %0,%%a0\n\t"
+                "addl   %%d0,%%a0\n\t"
+                "2:\n\t"
+                ".word  0xf4e8\n\t"
+                "addl   #0x10,%%a0\n\t"
+                "cmpl   %1,%%a0\n\t"
+                "blt    2b\n\t"
+                "addql  #1,%%d0\n\t"
+                "cmpil  #4,%%d0\n\t"
+                "bne    1b"
+                : : "a" (sset), "a" (eset) : "d0", "a0" );
+}
+
+#else
+#define cache_invalidate_lines(a,b)
+#endif
+
+
+/*
+ * cache_push() semantics: Write back any dirty cache data in the given area,
+ * and invalidate the range in the instruction cache. It needs not (but may)
+ * invalidate those entries also in the data cache. The range is defined by a
+ * _physical_ address.
+ */
+
+void cache_push (unsigned long paddr, int len)
+{
+        cache_invalidate_lines(paddr, len);
+}
+
+
+/*
+ * cache_push_v() semantics: Write back any dirty cache data in the given
+ * area, and invalidate those entries at least in the instruction cache. This
+ * is intended to be used after data has been written that can be executed as
+ * code later. The range is defined by a _user_mode_ _virtual_ address  (or,
+ * more exactly, the space is defined by the %sfc/%dfc register.)
+ */
+
+void cache_push_v (unsigned long vaddr, int len)
+{
+        cache_invalidate_lines(vaddr, len);
+}
+
+/* Map some physical address range into the kernel address space. The
+ * code is copied and adapted from map_chunk().
+ */
+
+unsigned long kernel_map(unsigned long paddr, unsigned long size,
+                         int nocacheflag, unsigned long *memavailp )
+{
+        return paddr;
+}
+
+
+int is_in_rom(unsigned long addr)
+{
+        extern unsigned long _ramstart, _ramend;
+
+        /*
+         *      What we are really trying to do is determine if addr is
+         *      in an allocated kernel memory region. If not then assume
+         *      we cannot free it or otherwise de-allocate it. Ideally
+         *      we could restrict this to really being in a ROM or flash,
+         *      but that would need to be done on a board by board basis,
+         *      not globally.
+         */
+        if ((addr < _ramstart) || (addr >= _ramend))
+                return(1);
+
+        /* Default case, not in ROM */
+        return(0);
+}
+