sh: bootmem tidying for discontig/sparsemem preparation.

This reworks some of the node 0 bootmem initialization in
preparation for discontigmem and sparsemem support.

ARCH_POPULATES_NODE_MAP is switched to as a result of this.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 95 insertions, 69 deletions

diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 4d6d89115194..60cc2161438f 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -4,7 +4,7 @@
  * This file handles the architecture-dependent parts of initialization
  *
  *  Copyright (C) 1999  Niibe Yutaka
- *  Copyright (C) 2002 - 2006 Paul Mundt
+ *  Copyright (C) 2002 - 2007 Paul Mundt
  */
 #include <linux/screen_info.h>
 #include <linux/ioport.h>
@@ -15,15 +15,18 @@
 #include <linux/seq_file.h>
 #include <linux/root_dev.h>
 #include <linux/utsname.h>
+#include <linux/nodemask.h>
 #include <linux/cpu.h>
 #include <linux/pfn.h>
 #include <linux/fs.h>
+#include <linux/mm.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 #include <asm/sections.h>
 #include <asm/irq.h>
 #include <asm/setup.h>
 #include <asm/clock.h>
+#include <asm/mmu_context.h>
 
 extern void * __rd_start, * __rd_end;
 
@@ -202,53 +205,33 @@ static int __init sh_mv_setup(char **cmdline_p)
         return 0;
 }
 
-void __init setup_arch(char **cmdline_p)
+/*
+ * Register fully available low RAM pages with the bootmem allocator.
+ */
+static void __init register_bootmem_low_pages(void)
 {
-        unsigned long bootmap_size;
-        unsigned long start_pfn, max_pfn, max_low_pfn;
-
-#ifdef CONFIG_CMDLINE_BOOL
-        strcpy(COMMAND_LINE, CONFIG_CMDLINE);
-#endif
-
-        ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
-
-#ifdef CONFIG_BLK_DEV_RAM
-        rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
-        rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
-        rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
-#endif
-
-        if (!MOUNT_ROOT_RDONLY)
-                root_mountflags &= ~MS_RDONLY;
-        init_mm.start_code = (unsigned long) _text;
-        init_mm.end_code = (unsigned long) _etext;
-        init_mm.end_data = (unsigned long) _edata;
-        init_mm.brk = (unsigned long) _end;
-
-        code_resource.start = (unsigned long)virt_to_phys(_text);
-        code_resource.end = (unsigned long)virt_to_phys(_etext)-1;
-        data_resource.start = (unsigned long)virt_to_phys(_etext);
-        data_resource.end = (unsigned long)virt_to_phys(_edata)-1;
-
-        sh_mv_setup(cmdline_p);
-
+        unsigned long curr_pfn, last_pfn, pages;
 
         /*
-         * Find the highest page frame number we have available
+         * We are rounding up the start address of usable memory:
          */
-        max_pfn = PFN_DOWN(__pa(memory_end));
+        curr_pfn = PFN_UP(__MEMORY_START);
 
         /*
-         * Determine low and high memory ranges:
+         * ... and at the end of the usable range downwards:
          */
-        max_low_pfn = max_pfn;
+        last_pfn = PFN_DOWN(__pa(memory_end));
 
-        /*
-         * Partially used pages are not usable - thus
-         * we are rounding upwards:
-         */
-        start_pfn = PFN_UP(__pa(_end));
+        if (last_pfn > max_low_pfn)
+                last_pfn = max_low_pfn;
+
+        pages = last_pfn - curr_pfn;
+        free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
+}
+
+void __init setup_bootmem_allocator(unsigned long start_pfn)
+{
+        unsigned long bootmap_size;
 
         /*
          * Find a proper area for the bootmem bitmap. After this
@@ -256,31 +239,11 @@ void __init setup_arch(char **cmdline_p)
          * is intact) must be done via bootmem_alloc().
          */
         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
-                                         __MEMORY_START>>PAGE_SHIFT,
-                                         max_low_pfn);
-        /*
-         * Register fully available low RAM pages with the bootmem allocator.
-         */
-        {
-                unsigned long curr_pfn, last_pfn, pages;
-
-                /*
-                 * We are rounding up the start address of usable memory:
-                 */
-                curr_pfn = PFN_UP(__MEMORY_START);
-                /*
-                 * ... and at the end of the usable range downwards:
-                 */
-                last_pfn = PFN_DOWN(__pa(memory_end));
+                                         min_low_pfn, max_low_pfn);
 
-                if (last_pfn > max_low_pfn)
-                        last_pfn = max_low_pfn;
-
-                pages = last_pfn - curr_pfn;
-                free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
-                                  PFN_PHYS(pages));
-        }
+        register_bootmem_low_pages();
 
+        node_set_online(0);
 
         /*
          * Reserve the kernel text and
@@ -289,14 +252,14 @@ void __init setup_arch(char **cmdline_p)
          * case of us accidentally initializing the bootmem allocator with
          * an invalid RAM area.
          */
-        reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
+        reserve_bootmem(__MEMORY_START+PAGE_SIZE,
                 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 
         /*
          * reserve physical page 0 - it's a special BIOS page on many boxes,
          * enabling clean reboots, SMP operation, laptop functions.
          */
-        reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);
+        reserve_bootmem(__MEMORY_START, PAGE_SIZE);
 
 #ifdef CONFIG_BLK_DEV_INITRD
         ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
@@ -310,8 +273,8 @@ void __init setup_arch(char **cmdline_p)
 
         if (LOADER_TYPE && INITRD_START) {
                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
-                        reserve_bootmem_node(NODE_DATA(0), INITRD_START +
-                                                __MEMORY_START, INITRD_SIZE);
+                        reserve_bootmem(INITRD_START + __MEMORY_START,
+                                        INITRD_SIZE);
                         initrd_start = INITRD_START + PAGE_OFFSET +
                                         __MEMORY_START;
                         initrd_end = initrd_start + INITRD_SIZE;
@@ -324,6 +287,71 @@ void __init setup_arch(char **cmdline_p)
                 }
         }
 #endif
+}
+
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+static void __init setup_memory(void)
+{
+        unsigned long start_pfn;
+
+        /*
+         * Partially used pages are not usable - thus
+         * we are rounding upwards:
+         */
+        start_pfn = PFN_UP(__pa(_end));
+        setup_bootmem_allocator(start_pfn);
+}
+#else
+extern void __init setup_memory(void);
+#endif
+
+void __init setup_arch(char **cmdline_p)
+{
+        enable_mmu();
+
+#ifdef CONFIG_CMDLINE_BOOL
+        strcpy(COMMAND_LINE, CONFIG_CMDLINE);
+#endif
+
+        ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
+
+#ifdef CONFIG_BLK_DEV_RAM
+        rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
+        rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
+        rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
+#endif
+
+        if (!MOUNT_ROOT_RDONLY)
+                root_mountflags &= ~MS_RDONLY;
+        init_mm.start_code = (unsigned long) _text;
+        init_mm.end_code = (unsigned long) _etext;
+        init_mm.end_data = (unsigned long) _edata;
+        init_mm.brk = (unsigned long) _end;
+
+        code_resource.start = virt_to_phys(_text);
+        code_resource.end = virt_to_phys(_etext)-1;
+        data_resource.start = virt_to_phys(_etext);
+        data_resource.end = virt_to_phys(_edata)-1;
+
+        parse_early_param();
+
+        sh_mv_setup(cmdline_p);
+
+        /*
+         * Find the highest page frame number we have available
+         */
+        max_pfn = PFN_DOWN(__pa(memory_end));
+
+        /*
+         * Determine low and high memory ranges:
+         */
+        max_low_pfn = max_pfn;
+        min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
+
+        nodes_clear(node_online_map);
+        setup_memory();
+        paging_init();
+        sparse_init();
 
 #ifdef CONFIG_DUMMY_CONSOLE
         conswitchp = &dummy_con;
@@ -332,8 +360,6 @@ void __init setup_arch(char **cmdline_p)
         /* Perform the machine specific initialisation */
         if (likely(sh_mv.mv_setup))
                 sh_mv.mv_setup(cmdline_p);
-
-        paging_init();
 }
 
 struct sh_machine_vector* __init get_mv_byname(const char* name)