11 files changed, 271 insertions, 209 deletions

diff --git a/arch/sh/include/asm/io_generic.h b/arch/sh/include/asm/io_generic.h
index 1e5d375f55dc..491df93cbf8e 100644
--- a/arch/sh/include/asm/io_generic.h
+++ b/arch/sh/include/asm/io_generic.h
@@ -38,5 +38,6 @@ void IO_CONCAT(__IO_PREFIX,iounmap)(void *addr);
 
 void __iomem *IO_CONCAT(__IO_PREFIX,ioport_map)(unsigned long addr, unsigned int size);
 void IO_CONCAT(__IO_PREFIX,ioport_unmap)(void __iomem *addr);
+void IO_CONCAT(__IO_PREFIX,mem_init)(void);
 
 #undef __IO_PREFIX
diff --git a/arch/sh/include/asm/kexec.h b/arch/sh/include/asm/kexec.h
index 765a5e1660fc..ad6ef8a275ee 100644
--- a/arch/sh/include/asm/kexec.h
+++ b/arch/sh/include/asm/kexec.h
@@ -26,6 +26,10 @@
 /* The native architecture */
 #define KEXEC_ARCH KEXEC_ARCH_SH
 
+#ifdef CONFIG_KEXEC
+/* arch/sh/kernel/machine_kexec.c */
+void reserve_crashkernel(void);
+
 static inline void crash_setup_regs(struct pt_regs *newregs,
                                     struct pt_regs *oldregs)
 {
@@ -59,4 +63,8 @@ static inline void crash_setup_regs(struct pt_regs *newregs,
                 newregs->pc = (unsigned long)current_text_addr();
         }
 }
+#else
+static inline void reserve_crashkernel(void) { }
+#endif /* CONFIG_KEXEC */
+
 #endif /* __ASM_SH_KEXEC_H */
diff --git a/arch/sh/include/asm/machvec.h b/arch/sh/include/asm/machvec.h
index 9c30955630ff..bc0218cb72e1 100644
--- a/arch/sh/include/asm/machvec.h
+++ b/arch/sh/include/asm/machvec.h
@@ -49,6 +49,8 @@ struct sh_machine_vector {
 
         int (*mv_clk_init)(void);
         int (*mv_mode_pins)(void);
+
+        void (*mv_mem_init)(void);
 };
 
 extern struct sh_machine_vector sh_mv;
diff --git a/arch/sh/include/asm/mmzone.h b/arch/sh/include/asm/mmzone.h
index 7f5363b29ba0..8887baff5eff 100644
--- a/arch/sh/include/asm/mmzone.h
+++ b/arch/sh/include/asm/mmzone.h
@@ -42,9 +42,10 @@ setup_bootmem_node(int nid, unsigned long start, unsigned long end)
 void __init plat_mem_setup(void);
 
 /* arch/sh/kernel/setup.c */
-void __init setup_bootmem_allocator(unsigned long start_pfn);
 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
                                unsigned long end_pfn);
+/* arch/sh/mm/init.c */
+void __init allocate_pgdat(unsigned int nid);
 
 #endif /* __KERNEL__ */
 #endif /* __ASM_SH_MMZONE_H */
diff --git a/arch/sh/include/asm/page.h b/arch/sh/include/asm/page.h
index 0152c040f6c3..fb703d120d09 100644
--- a/arch/sh/include/asm/page.h
+++ b/arch/sh/include/asm/page.h
@@ -49,7 +49,7 @@
 
 extern unsigned long shm_align_mask;
 extern unsigned long max_low_pfn, min_low_pfn;
-extern unsigned long memory_start, memory_end;
+extern unsigned long memory_start, memory_end, memory_limit;
 
 static inline unsigned long
 pages_do_alias(unsigned long addr1, unsigned long addr2)
diff --git a/arch/sh/include/asm/setup.h b/arch/sh/include/asm/setup.h
index 4758325bb24a..01fa17a3d759 100644
--- a/arch/sh/include/asm/setup.h
+++ b/arch/sh/include/asm/setup.h
@@ -19,6 +19,7 @@
 #define COMMAND_LINE ((char *) (PARAM+0x100))
 
 void sh_mv_setup(void);
+void check_for_initrd(void);
 
 #endif /* __KERNEL__ */
 
diff --git a/arch/sh/kernel/machine_kexec.c b/arch/sh/kernel/machine_kexec.c
index 0e90c7f9564f..5a559e666eb3 100644
--- a/arch/sh/kernel/machine_kexec.c
+++ b/arch/sh/kernel/machine_kexec.c
@@ -8,7 +8,6 @@
  * This source code is licensed under the GNU General Public License,
  * Version 2.  See the file COPYING for more details.
  */
-
 #include <linux/mm.h>
 #include <linux/kexec.h>
 #include <linux/delay.h>
@@ -16,6 +15,7 @@
 #include <linux/numa.h>
 #include <linux/ftrace.h>
 #include <linux/suspend.h>
+#include <linux/lmb.h>
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
 #include <asm/mmu_context.h>
@@ -151,3 +151,60 @@ void arch_crash_save_vmcoreinfo(void)
         VMCOREINFO_CONFIG(X2TLB);
 #endif
 }
+
+void __init reserve_crashkernel(void)
+{
+        unsigned long long crash_size, crash_base;
+        int ret;
+
+        /* this is necessary because of lmb_phys_mem_size() */
+        lmb_analyze();
+
+        ret = parse_crashkernel(boot_command_line, lmb_phys_mem_size(),
+                        &crash_size, &crash_base);
+        if (ret == 0 && crash_size > 0) {
+                crashk_res.start = crash_base;
+                crashk_res.end = crash_base + crash_size - 1;
+        }
+
+        if (crashk_res.end == crashk_res.start)
+                goto disable;
+
+        crash_size = PAGE_ALIGN(crashk_res.end - crashk_res.start + 1);
+        if (!crashk_res.start) {
+                unsigned long max = lmb_end_of_DRAM() - memory_limit;
+                crashk_res.start = __lmb_alloc_base(crash_size, PAGE_SIZE, max);
+                if (!crashk_res.start) {
+                        pr_err("crashkernel allocation failed\n");
+                        goto disable;
+                }
+        } else {
+                ret = lmb_reserve(crashk_res.start, crash_size);
+                if (unlikely(ret < 0)) {
+                        pr_err("crashkernel reservation failed - "
+                               "memory is in use\n");
+                        goto disable;
+                }
+        }
+
+        crashk_res.end = crashk_res.start + crash_size - 1;
+
+        /*
+         * Crash kernel trumps memory limit
+         */
+        if ((lmb_end_of_DRAM() - memory_limit) <= crashk_res.end) {
+                memory_limit = 0;
+                pr_info("Disabled memory limit for crashkernel\n");
+        }
+
+        pr_info("Reserving %ldMB of memory at 0x%08lx "
+                "for crashkernel (System RAM: %ldMB)\n",
+                (unsigned long)(crash_size >> 20),
+                (unsigned long)(crashk_res.start),
+                (unsigned long)(lmb_phys_mem_size() >> 20));
+
+        return;
+
+disable:
+        crashk_res.start = crashk_res.end = 0;
+}
diff --git a/arch/sh/kernel/machvec.c b/arch/sh/kernel/machvec.c
index 1652340ba3f2..85cfaf916fdc 100644
--- a/arch/sh/kernel/machvec.c
+++ b/arch/sh/kernel/machvec.c
@@ -131,6 +131,7 @@ void __init sh_mv_setup(void)
         mv_set(ioport_unmap);
         mv_set(irq_demux);
         mv_set(mode_pins);
+        mv_set(mem_init);
 
         if (!sh_mv.mv_nr_irqs)
                 sh_mv.mv_nr_irqs = NR_IRQS;
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 4f1585f41f2b..272734681d29 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 - 2007 Paul Mundt
+ *  Copyright (C) 2002 - 2010 Paul Mundt
  */
 #include <linux/screen_info.h>
 #include <linux/ioport.h>
@@ -41,6 +41,7 @@
 #include <asm/clock.h>
 #include <asm/smp.h>
 #include <asm/mmu_context.h>
+#include <asm/mmzone.h>
 
 /*
  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
@@ -94,6 +95,7 @@ unsigned long memory_start;
 EXPORT_SYMBOL(memory_start);
 unsigned long memory_end = 0;
 EXPORT_SYMBOL(memory_end);
+unsigned long memory_limit = 0;
 
 static struct resource mem_resources[MAX_NUMNODES];
 
@@ -101,94 +103,18 @@ int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
 
 static int __init early_parse_mem(char *p)
 {
-        unsigned long size;
+        if (!p)
+                return 1;
 
-        memory_start = (unsigned long)__va(__MEMORY_START);
-        size = memparse(p, &p);
+        memory_limit = PAGE_ALIGN(memparse(p, &p));
 
-        if (size > __MEMORY_SIZE) {
-                printk(KERN_ERR
-                        "Using mem= to increase the size of kernel memory "
-                        "is not allowed.\n"
-                        "  Recompile the kernel with the correct value for "
-                        "CONFIG_MEMORY_SIZE.\n");
-                return 0;
-        }
-
-        memory_end = memory_start + size;
+        pr_notice("Memory limited to %ldMB\n", memory_limit >> 20);
 
         return 0;
 }
 early_param("mem", early_parse_mem);
 
-/*
- * Register fully available low RAM pages with the bootmem allocator.
- */
-static void __init register_bootmem_low_pages(void)
-{
-        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));
-
-        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));
-}
-
-#ifdef CONFIG_KEXEC
-static void __init reserve_crashkernel(void)
-{
-        unsigned long long free_mem;
-        unsigned long long crash_size, crash_base;
-        void *vp;
-        int ret;
-
-        free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
-
-        ret = parse_crashkernel(boot_command_line, free_mem,
-                        &crash_size, &crash_base);
-        if (ret == 0 && crash_size) {
-                if (crash_base <= 0) {
-                        vp = alloc_bootmem_nopanic(crash_size);
-                        if (!vp) {
-                                printk(KERN_INFO "crashkernel allocation "
-                                       "failed\n");
-                                return;
-                        }
-                        crash_base = __pa(vp);
-                } else if (reserve_bootmem(crash_base, crash_size,
-                                        BOOTMEM_EXCLUSIVE) < 0) {
-                        printk(KERN_INFO "crashkernel reservation failed - "
-                                        "memory is in use\n");
-                        return;
-                }
-
-                printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
-                                "for crashkernel (System RAM: %ldMB)\n",
-                                (unsigned long)(crash_size >> 20),
-                                (unsigned long)(crash_base >> 20),
-                                (unsigned long)(free_mem >> 20));
-                crashk_res.start = crash_base;
-                crashk_res.end   = crash_base + crash_size - 1;
-                insert_resource(&iomem_resource, &crashk_res);
-        }
-}
-#else
-static inline void __init reserve_crashkernel(void)
-{}
-#endif
-
-static void __init check_for_initrd(void)
+void __init check_for_initrd(void)
 {
 #ifdef CONFIG_BLK_DEV_INITRD
         unsigned long start, end;
@@ -235,7 +161,7 @@ static void __init check_for_initrd(void)
         initrd_start = (unsigned long)__va(__pa(start));
         initrd_end = initrd_start + INITRD_SIZE;
 
-        reserve_bootmem(__pa(initrd_start), INITRD_SIZE, BOOTMEM_DEFAULT);
+        lmb_reserve(__pa(initrd_start), INITRD_SIZE);
 
         return;
 
@@ -265,13 +191,18 @@ void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
                                                 unsigned long end_pfn)
 {
         struct resource *res = &mem_resources[nid];
+        unsigned long start, end;
 
         WARN_ON(res->name); /* max one active range per node for now */
 
+        start = start_pfn << PAGE_SHIFT;
+        end = end_pfn << PAGE_SHIFT;
+
         res->name = "System RAM";
-        res->start = start_pfn << PAGE_SHIFT;
-        res->end = (end_pfn << PAGE_SHIFT) - 1;
+        res->start = start;
+        res->end = end - 1;
         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+
         if (request_resource(&iomem_resource, res)) {
                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
                        start_pfn, end_pfn);
@@ -287,100 +218,18 @@ void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
         request_resource(res, &data_resource);
         request_resource(res, &bss_resource);
 
-        add_active_range(nid, start_pfn, end_pfn);
-}
-
-void __init setup_bootmem_allocator(unsigned long free_pfn)
-{
-        unsigned long bootmap_size;
-        unsigned long bootmap_pages, bootmem_paddr;
-        u64 total_pages = (lmb_end_of_DRAM() - __MEMORY_START) >> PAGE_SHIFT;
-        int i;
-
-        bootmap_pages = bootmem_bootmap_pages(total_pages);
-
-        bootmem_paddr = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
-
-        /*
-         * Find a proper area for the bootmem bitmap. After this
-         * bootstrap step all allocations (until the page allocator
-         * is intact) must be done via bootmem_alloc().
-         */
-        bootmap_size = init_bootmem_node(NODE_DATA(0),
-                                         bootmem_paddr >> PAGE_SHIFT,
-                                         min_low_pfn, max_low_pfn);
-
-        /* Add active regions with valid PFNs. */
-        for (i = 0; i < lmb.memory.cnt; i++) {
-                unsigned long start_pfn, end_pfn;
-                start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
-                end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
-                __add_active_range(0, start_pfn, end_pfn);
-        }
-
-        /*
-         * Add all physical memory to the bootmem map and mark each
-         * area as present.
-         */
-        register_bootmem_low_pages();
-
-        /* Reserve the sections we're already using. */
-        for (i = 0; i < lmb.reserved.cnt; i++)
-                reserve_bootmem(lmb.reserved.region[i].base,
-                                lmb_size_bytes(&lmb.reserved, i),
-                                BOOTMEM_DEFAULT);
-
-        node_set_online(0);
-
-        sparse_memory_present_with_active_regions(0);
-
-        check_for_initrd();
-
-        reserve_crashkernel();
-}
-
-#ifndef CONFIG_NEED_MULTIPLE_NODES
-static void __init setup_memory(void)
-{
-        unsigned long start_pfn;
-        u64 base = min_low_pfn << PAGE_SHIFT;
-        u64 size = (max_low_pfn << PAGE_SHIFT) - base;
-
         /*
-         * Partially used pages are not usable - thus
-         * we are rounding upwards:
+         * Also make sure that there is a PMB mapping that covers this
+         * range before we attempt to activate it, to avoid reset by MMU.
+         * We can hit this path with NUMA or memory hot-add.
          */
-        start_pfn = PFN_UP(__pa(_end));
+        pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
+                         PAGE_KERNEL);
 
-        lmb_add(base, size);
-
-        /*
-         * Reserve the kernel text and
-         * Reserve the bootmem bitmap. We do this in two steps (first step
-         * was init_bootmem()), because this catches the (definitely buggy)
-         * case of us accidentally initializing the bootmem allocator with
-         * an invalid RAM area.
-         */
-        lmb_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
-                    (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) -
-                    (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));
-
-        /*
-         * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
-         */
-        if (CONFIG_ZERO_PAGE_OFFSET != 0)
-                lmb_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET);
-
-        lmb_analyze();
-        lmb_dump_all();
-
-        setup_bootmem_allocator(start_pfn);
+        add_active_range(nid, start_pfn, end_pfn);
 }
-#else
-extern void __init setup_memory(void);
-#endif
 
-void __init __attribute__ ((weak)) plat_early_device_setup(void)
+void __init __weak plat_early_device_setup(void)
 {
 }
 
@@ -421,10 +270,6 @@ void __init setup_arch(char **cmdline_p)
         bss_resource.start = virt_to_phys(__bss_start);
         bss_resource.end = virt_to_phys(_ebss)-1;
 
-        memory_start = (unsigned long)__va(__MEMORY_START);
-        if (!memory_end)
-                memory_end = memory_start + __MEMORY_SIZE;
-
 #ifdef CONFIG_CMDLINE_OVERWRITE
         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 #else
@@ -441,39 +286,18 @@ void __init setup_arch(char **cmdline_p)
 
         parse_early_param();
 
-        uncached_init();
-
         plat_early_device_setup();
 
-        /* Let earlyprintk output early console messages */
-        early_platform_driver_probe("earlyprintk", 1, 1);
-
         sh_mv_setup();
 
-        /*
-         * 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);
+        /* Let earlyprintk output early console messages */
+        early_platform_driver_probe("earlyprintk", 1, 1);
 
-        pmb_init();
-        lmb_init();
-        setup_memory();
-        sparse_init();
+        paging_init();
 
 #ifdef CONFIG_DUMMY_CONSOLE
         conswitchp = &dummy_con;
 #endif
-        paging_init();
-
-        ioremap_fixed_init();
 
         /* Perform the machine specific initialisation */
         if (likely(sh_mv.mv_setup))
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index c505de61a5ca..7f3cb5254abb 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -2,7 +2,7 @@
  * linux/arch/sh/mm/init.c
  *
  *  Copyright (C) 1999  Niibe Yutaka
- *  Copyright (C) 2002 - 2007  Paul Mundt
+ *  Copyright (C) 2002 - 2010  Paul Mundt
  *
  *  Based on linux/arch/i386/mm/init.c:
  *   Copyright (C) 1995  Linus Torvalds
@@ -16,17 +16,31 @@
 #include <linux/pagemap.h>
 #include <linux/percpu.h>
 #include <linux/io.h>
+#include <linux/lmb.h>
+#include <linux/kexec.h>
 #include <linux/dma-mapping.h>
 #include <asm/mmu_context.h>
+#include <asm/mmzone.h>
 #include <asm/tlb.h>
 #include <asm/cacheflush.h>
 #include <asm/sections.h>
+#include <asm/setup.h>
 #include <asm/cache.h>
 #include <asm/sizes.h>
 
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 pgd_t swapper_pg_dir[PTRS_PER_PGD];
 
+void __init generic_mem_init(void)
+{
+        lmb_add(__MEMORY_START, __MEMORY_SIZE);
+}
+
+void __init __weak plat_mem_setup(void)
+{
+        /* Nothing to see here, move along. */
+}
+
 #ifdef CONFIG_MMU
 static pte_t *__get_pte_phys(unsigned long addr)
 {
@@ -152,15 +166,166 @@ void __init page_table_range_init(unsigned long start, unsigned long end,
 }
 #endif  /* CONFIG_MMU */
 
-/*
- * paging_init() sets up the page tables
- */
+void __init allocate_pgdat(unsigned int nid)
+{
+        unsigned long start_pfn, end_pfn;
+#ifdef CONFIG_NEED_MULTIPLE_NODES
+        unsigned long phys;
+#endif
+
+        get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
+
+#ifdef CONFIG_NEED_MULTIPLE_NODES
+        phys = __lmb_alloc_base(sizeof(struct pglist_data),
+                                SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
+        /* Retry with all of system memory */
+        if (!phys)
+                phys = __lmb_alloc_base(sizeof(struct pglist_data),
+                                        SMP_CACHE_BYTES, lmb_end_of_DRAM());
+        if (!phys)
+                panic("Can't allocate pgdat for node %d\n", nid);
+
+        NODE_DATA(nid) = __va(phys);
+        memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
+
+        NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
+#endif
+
+        NODE_DATA(nid)->node_start_pfn = start_pfn;
+        NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
+}
+
+static void __init bootmem_init_one_node(unsigned int nid)
+{
+        unsigned long total_pages, paddr;
+        unsigned long end_pfn;
+        struct pglist_data *p;
+        int i;
+
+        p = NODE_DATA(nid);
+
+        /* Nothing to do.. */
+        if (!p->node_spanned_pages)
+                return;
+
+        end_pfn = p->node_start_pfn + p->node_spanned_pages;
+
+        total_pages = bootmem_bootmap_pages(p->node_spanned_pages);
+
+        paddr = lmb_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
+        if (!paddr)
+                panic("Can't allocate bootmap for nid[%d]\n", nid);
+
+        init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
+
+        free_bootmem_with_active_regions(nid, end_pfn);
+
+        /*
+         * XXX Handle initial reservations for the system memory node
+         * only for the moment, we'll refactor this later for handling
+         * reservations in other nodes.
+         */
+        if (nid == 0) {
+                /* Reserve the sections we're already using. */
+                for (i = 0; i < lmb.reserved.cnt; i++)
+                        reserve_bootmem(lmb.reserved.region[i].base,
+                                        lmb_size_bytes(&lmb.reserved, i),
+                                        BOOTMEM_DEFAULT);
+        }
+
+        sparse_memory_present_with_active_regions(nid);
+}
+
+static void __init do_init_bootmem(void)
+{
+        int i;
+
+        /* Add active regions with valid PFNs. */
+        for (i = 0; i < lmb.memory.cnt; i++) {
+                unsigned long start_pfn, end_pfn;
+                start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
+                end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
+                __add_active_range(0, start_pfn, end_pfn);
+        }
+
+        /* All of system RAM sits in node 0 for the non-NUMA case */
+        allocate_pgdat(0);
+        node_set_online(0);
+
+        plat_mem_setup();
+
+        for_each_online_node(i)
+                bootmem_init_one_node(i);
+
+        sparse_init();
+}
+
+static void __init early_reserve_mem(void)
+{
+        unsigned long start_pfn;
+
+        /*
+         * Partially used pages are not usable - thus
+         * we are rounding upwards:
+         */
+        start_pfn = PFN_UP(__pa(_end));
+
+        /*
+         * Reserve the kernel text and Reserve the bootmem bitmap. We do
+         * this in two steps (first step was init_bootmem()), because
+         * this catches the (definitely buggy) case of us accidentally
+         * initializing the bootmem allocator with an invalid RAM area.
+         */
+        lmb_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
+                    (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) -
+                    (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));
+
+        /*
+         * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
+         */
+        if (CONFIG_ZERO_PAGE_OFFSET != 0)
+                lmb_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET);
+
+        /*
+         * Handle additional early reservations
+         */
+        check_for_initrd();
+        reserve_crashkernel();
+}
+
 void __init paging_init(void)
 {
         unsigned long max_zone_pfns[MAX_NR_ZONES];
         unsigned long vaddr, end;
         int nid;
 
+        lmb_init();
+
+        sh_mv.mv_mem_init();
+
+        early_reserve_mem();
+
+        lmb_enforce_memory_limit(memory_limit);
+        lmb_analyze();
+
+        lmb_dump_all();
+
+        /*
+         * Determine low and high memory ranges:
+         */
+        max_low_pfn = max_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT;
+        min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
+
+        nodes_clear(node_online_map);
+
+        memory_start = (unsigned long)__va(__MEMORY_START);
+        memory_end = memory_start + (memory_limit ?: lmb_phys_mem_size());
+
+        uncached_init();
+        pmb_init();
+        do_init_bootmem();
+        ioremap_fixed_init();
+
         /* We don't need to map the kernel through the TLB, as
          * it is permanatly mapped using P1. So clear the
          * entire pgd. */
diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c
index e9f5384f3f1c..18623ba751b3 100644
--- a/arch/sh/mm/pmb.c
+++ b/arch/sh/mm/pmb.c
@@ -341,6 +341,8 @@ int pmb_bolt_mapping(unsigned long vaddr, phys_addr_t phys,
         unsigned long flags, pmb_flags;
         int i, mapped;
 
+        if (size < SZ_16M)
+                return -EINVAL;
         if (!pmb_addr_valid(vaddr, size))
                 return -EFAULT;
         if (pmb_mapping_exists(vaddr, phys, size))