1 files changed, 43 insertions, 24 deletions

diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
index a72f42498c25..2253e122aa85 100644
--- a/arch/microblaze/mm/init.c
+++ b/arch/microblaze/mm/init.c
@@ -44,9 +44,9 @@ char *klimit = _end;
  */
 unsigned long memory_start;
 EXPORT_SYMBOL(memory_start);
-unsigned long memory_end; /* due to mm/nommu.c */
 unsigned long memory_size;
 EXPORT_SYMBOL(memory_size);
+unsigned long lowmem_size;
 
 /*
  * paging_init() sets up the page tables - in fact we've already done this.
@@ -58,7 +58,7 @@ static void __init paging_init(void)
         /* Clean every zones */
         memset(zones_size, 0, sizeof(zones_size));
 
-        zones_size[ZONE_DMA] = max_mapnr;
+        zones_size[ZONE_DMA] = max_pfn;
 
         free_area_init(zones_size);
 }
@@ -74,32 +74,31 @@ void __init setup_memory(void)
         /* Find main memory where is the kernel */
         for_each_memblock(memory, reg) {
                 memory_start = (u32)reg->base;
-                memory_end = (u32) reg->base + reg->size;
+                lowmem_size = reg->size;
                 if ((memory_start <= (u32)_text) &&
-                                        ((u32)_text <= memory_end)) {
-                        memory_size = memory_end - memory_start;
+                        ((u32)_text <= (memory_start + lowmem_size - 1))) {
+                        memory_size = lowmem_size;
                         PAGE_OFFSET = memory_start;
-                        printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "
+                        printk(KERN_INFO "%s: Main mem: 0x%x, "
                                 "size 0x%08x\n", __func__, (u32) memory_start,
-                                        (u32) memory_end, (u32) memory_size);
+                                        (u32) memory_size);
                         break;
                 }
         }
 
-        if (!memory_start || !memory_end) {
-                panic("%s: Missing memory setting 0x%08x-0x%08x\n",
-                        __func__, (u32) memory_start, (u32) memory_end);
+        if (!memory_start || !memory_size) {
+                panic("%s: Missing memory setting 0x%08x, size=0x%08x\n",
+                        __func__, (u32) memory_start, (u32) memory_size);
         }
 
         /* reservation of region where is the kernel */
         kernel_align_start = PAGE_DOWN((u32)_text);
         /* ALIGN can be remove because _end in vmlinux.lds.S is align */
         kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
-        memblock_reserve(kernel_align_start, kernel_align_size);
-        printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
+        printk(KERN_INFO "%s: kernel addr:0x%08x-0x%08x size=0x%08x\n",
                 __func__, kernel_align_start, kernel_align_start
                         + kernel_align_size, kernel_align_size);
-
+        memblock_reserve(kernel_align_start, kernel_align_size);
 #endif
         /*
          * Kernel:
@@ -116,11 +115,13 @@ void __init setup_memory(void)
         min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
         /* RAM is assumed contiguous */
         num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
-        max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;
+        max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
+        max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;
 
         printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
         printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
         printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
+        printk(KERN_INFO "%s: max_pfn: %#lx\n", __func__, max_pfn);
 
         /*
          * Find an area to use for the bootmem bitmap.
@@ -134,14 +135,25 @@ void __init setup_memory(void)
         memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);
 
         /* free bootmem is whole main memory */
-        free_bootmem(memory_start, memory_size);
+        free_bootmem(memory_start, lowmem_size);
 
         /* reserve allocate blocks */
         for_each_memblock(reserved, reg) {
-                pr_debug("reserved - 0x%08x-0x%08x\n",
-                         (u32) reg->base, (u32) reg->size);
-                reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
+                unsigned long top = reg->base + reg->size - 1;
+
+                pr_debug("reserved - 0x%08x-0x%08x, %lx, %lx\n",
+                         (u32) reg->base, (u32) reg->size, top,
+                                                memory_start + lowmem_size - 1);
+
+                if (top <= (memory_start + lowmem_size - 1)) {
+                        reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
+                } else if (reg->base < (memory_start + lowmem_size - 1)) {
+                        unsigned long trunc_size = memory_start + lowmem_size -
+                                                                reg->base;
+                        reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT);
+                }
         }
+
 #ifdef CONFIG_MMU
         init_bootmem_done = 1;
 #endif
@@ -186,7 +198,8 @@ void free_initmem(void)
 
 void __init mem_init(void)
 {
-        high_memory = (void *)__va(memory_end);
+        high_memory = (void *)__va(memory_start + lowmem_size - 1);
+
         /* this will put all memory onto the freelists */
         totalram_pages += free_all_bootmem();
 
@@ -222,7 +235,6 @@ static void mm_cmdline_setup(void)
                 maxmem = memparse(p, &p);
                 if (maxmem && memory_size > maxmem) {
                         memory_size = maxmem;
-                        memory_end = memory_start + memory_size;
                         memblock.memory.regions[0].size = memory_size;
                 }
         }
@@ -272,9 +284,12 @@ asmlinkage void __init mmu_init(void)
         }
         /* Find main memory where the kernel is */
         memory_start = (u32) memblock.memory.regions[0].base;
-        memory_end = (u32) memblock.memory.regions[0].base +
-                                (u32) memblock.memory.regions[0].size;
-        memory_size = memory_end - memory_start;
+        lowmem_size = memory_size = (u32) memblock.memory.regions[0].size;
+
+        if (lowmem_size > CONFIG_LOWMEM_SIZE) {
+                lowmem_size = CONFIG_LOWMEM_SIZE;
+                memory_size = lowmem_size;
+        }
 
         mm_cmdline_setup(); /* FIXME parse args from command line - not used */
 
@@ -307,9 +322,13 @@ asmlinkage void __init mmu_init(void)
         ioremap_base = 0xfe000000UL;    /* for now, could be 0xfffff000 */
 #endif /* CONFIG_HIGHMEM_START_BOOL */
         ioremap_bot = ioremap_base;
-
         /* Initialize the context management stuff */
         mmu_context_init();
+
+        /* Shortly after that, the entire linear mapping will be available */
+        /* This will also cause that unflatten device tree will be allocated
+         * inside 768MB limit */
+        memblock_set_current_limit(memory_start + lowmem_size - 1);
 }
 
 /* This is only called until mem_init is done. */