x86: introduce initmem_init for 32 bit

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 90 insertions, 0 deletions

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index a0484adbf59d..9bc8607d7980 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -540,6 +540,96 @@ static void __init set_nx(void)
 }
 #endif
 
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+extern unsigned long find_max_low_pfn(void);
+unsigned long __init initmem_init(unsigned long start_pfn,
+                                  unsigned long end_pfn)
+{
+        /*
+         * partially used pages are not usable - thus
+         * we are rounding upwards:
+         */
+        min_low_pfn = PFN_UP(init_pg_tables_end);
+
+        max_low_pfn = find_max_low_pfn();
+
+#ifdef CONFIG_HIGHMEM
+        highstart_pfn = highend_pfn = max_pfn;
+        if (max_pfn > max_low_pfn)
+                highstart_pfn = max_low_pfn;
+        memory_present(0, 0, highend_pfn);
+        printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
+                pages_to_mb(highend_pfn - highstart_pfn));
+        num_physpages = highend_pfn;
+        high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
+#else
+        memory_present(0, 0, max_low_pfn);
+        num_physpages = max_low_pfn;
+        high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
+#endif
+#ifdef CONFIG_FLATMEM
+        max_mapnr = num_physpages;
+#endif
+        printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
+                        pages_to_mb(max_low_pfn));
+
+        setup_bootmem_allocator();
+
+        return max_low_pfn;
+}
+
+void __init zone_sizes_init(void)
+{
+        unsigned long max_zone_pfns[MAX_NR_ZONES];
+        memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
+        max_zone_pfns[ZONE_DMA] =
+                virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
+        max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+        remove_all_active_ranges();
+#ifdef CONFIG_HIGHMEM
+        max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
+        e820_register_active_regions(0, 0, highend_pfn);
+#else
+        e820_register_active_regions(0, 0, max_low_pfn);
+#endif
+
+        free_area_init_nodes(max_zone_pfns);
+}
+#endif /* !CONFIG_NEED_MULTIPLE_NODES */
+
+extern void reserve_initrd(void);
+
+void __init setup_bootmem_allocator(void)
+{
+        int i;
+        unsigned long bootmap_size, bootmap;
+        /*
+         * Initialize the boot-time allocator (with low memory only):
+         */
+        bootmap_size = bootmem_bootmap_pages(max_low_pfn)<<PAGE_SHIFT;
+        bootmap = find_e820_area(min_low_pfn<<PAGE_SHIFT,
+                                 max_pfn_mapped<<PAGE_SHIFT, bootmap_size,
+                                 PAGE_SIZE);
+        if (bootmap == -1L)
+                panic("Cannot find bootmem map of size %ld\n", bootmap_size);
+        reserve_early(bootmap, bootmap + bootmap_size, "BOOTMAP");
+#ifdef CONFIG_BLK_DEV_INITRD
+        reserve_initrd();
+#endif
+        bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, max_low_pfn);
+        printk(KERN_INFO "  mapped low ram: 0 - %08lx\n",
+                 max_pfn_mapped<<PAGE_SHIFT);
+        printk(KERN_INFO "  low ram: %08lx - %08lx\n",
+                 min_low_pfn<<PAGE_SHIFT, max_low_pfn<<PAGE_SHIFT);
+        printk(KERN_INFO "  bootmap %08lx - %08lx\n",
+                 bootmap, bootmap + bootmap_size);
+        for_each_online_node(i)
+                free_bootmem_with_active_regions(i, max_low_pfn);
+        early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT);
+
+}
+
+
 /*
  * paging_init() sets up the page tables - note that the first 8MB are
  * already mapped by head.S.