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-rw-r--r--kernel/arch/microblaze/mm/init.c437
1 files changed, 437 insertions, 0 deletions
diff --git a/kernel/arch/microblaze/mm/init.c b/kernel/arch/microblaze/mm/init.c
new file mode 100644
index 000000000..77bc7c7e6
--- /dev/null
+++ b/kernel/arch/microblaze/mm/init.c
@@ -0,0 +1,437 @@
+/*
+ * Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/bootmem.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/memblock.h>
+#include <linux/mm.h> /* mem_init */
+#include <linux/initrd.h>
+#include <linux/pagemap.h>
+#include <linux/pfn.h>
+#include <linux/slab.h>
+#include <linux/swap.h>
+#include <linux/export.h>
+
+#include <asm/page.h>
+#include <asm/mmu_context.h>
+#include <asm/pgalloc.h>
+#include <asm/sections.h>
+#include <asm/tlb.h>
+#include <asm/fixmap.h>
+
+/* Use for MMU and noMMU because of PCI generic code */
+int mem_init_done;
+
+#ifndef CONFIG_MMU
+unsigned int __page_offset;
+EXPORT_SYMBOL(__page_offset);
+
+#else
+static int init_bootmem_done;
+#endif /* CONFIG_MMU */
+
+char *klimit = _end;
+
+/*
+ * Initialize the bootmem system and give it all the memory we
+ * have available.
+ */
+unsigned long memory_start;
+EXPORT_SYMBOL(memory_start);
+unsigned long memory_size;
+EXPORT_SYMBOL(memory_size);
+unsigned long lowmem_size;
+
+#ifdef CONFIG_HIGHMEM
+pte_t *kmap_pte;
+EXPORT_SYMBOL(kmap_pte);
+pgprot_t kmap_prot;
+EXPORT_SYMBOL(kmap_prot);
+
+static inline pte_t *virt_to_kpte(unsigned long vaddr)
+{
+ return pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr),
+ vaddr), vaddr);
+}
+
+static void __init highmem_init(void)
+{
+ pr_debug("%x\n", (u32)PKMAP_BASE);
+ map_page(PKMAP_BASE, 0, 0); /* XXX gross */
+ pkmap_page_table = virt_to_kpte(PKMAP_BASE);
+
+ kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
+ kmap_prot = PAGE_KERNEL;
+}
+
+static void highmem_setup(void)
+{
+ unsigned long pfn;
+
+ for (pfn = max_low_pfn; pfn < max_pfn; ++pfn) {
+ struct page *page = pfn_to_page(pfn);
+
+ /* FIXME not sure about */
+ if (!memblock_is_reserved(pfn << PAGE_SHIFT))
+ free_highmem_page(page);
+ }
+}
+#endif /* CONFIG_HIGHMEM */
+
+/*
+ * paging_init() sets up the page tables - in fact we've already done this.
+ */
+static void __init paging_init(void)
+{
+ unsigned long zones_size[MAX_NR_ZONES];
+#ifdef CONFIG_MMU
+ int idx;
+
+ /* Setup fixmaps */
+ for (idx = 0; idx < __end_of_fixed_addresses; idx++)
+ clear_fixmap(idx);
+#endif
+
+ /* Clean every zones */
+ memset(zones_size, 0, sizeof(zones_size));
+
+#ifdef CONFIG_HIGHMEM
+ highmem_init();
+
+ zones_size[ZONE_DMA] = max_low_pfn;
+ zones_size[ZONE_HIGHMEM] = max_pfn;
+#else
+ zones_size[ZONE_DMA] = max_pfn;
+#endif
+
+ /* We don't have holes in memory map */
+ free_area_init_nodes(zones_size);
+}
+
+void __init setup_memory(void)
+{
+ unsigned long map_size;
+ struct memblock_region *reg;
+
+#ifndef CONFIG_MMU
+ u32 kernel_align_start, kernel_align_size;
+
+ /* Find main memory where is the kernel */
+ for_each_memblock(memory, reg) {
+ memory_start = (u32)reg->base;
+ lowmem_size = reg->size;
+ if ((memory_start <= (u32)_text) &&
+ ((u32)_text <= (memory_start + lowmem_size - 1))) {
+ memory_size = lowmem_size;
+ PAGE_OFFSET = memory_start;
+ pr_info("%s: Main mem: 0x%x, size 0x%08x\n",
+ __func__, (u32) memory_start,
+ (u32) memory_size);
+ break;
+ }
+ }
+
+ 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;
+ pr_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:
+ * start: base phys address of kernel - page align
+ * end: base phys address of kernel - page align
+ *
+ * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
+ * max_low_pfn
+ * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
+ */
+
+ /* memory start is from the kernel end (aligned) to higher addr */
+ min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
+ /* RAM is assumed contiguous */
+ max_mapnr = memory_size >> PAGE_SHIFT;
+ max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
+ max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;
+
+ pr_info("%s: max_mapnr: %#lx\n", __func__, max_mapnr);
+ pr_info("%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
+ pr_info("%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
+ pr_info("%s: max_pfn: %#lx\n", __func__, max_pfn);
+
+ /*
+ * Find an area to use for the bootmem bitmap.
+ * We look for the first area which is at least
+ * 128kB in length (128kB is enough for a bitmap
+ * for 4GB of memory, using 4kB pages), plus 1 page
+ * (in case the address isn't page-aligned).
+ */
+ map_size = init_bootmem_node(NODE_DATA(0),
+ PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn);
+ memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);
+
+ /* Add active regions with valid PFNs */
+ for_each_memblock(memory, reg) {
+ unsigned long start_pfn, end_pfn;
+
+ start_pfn = memblock_region_memory_base_pfn(reg);
+ end_pfn = memblock_region_memory_end_pfn(reg);
+ memblock_set_node(start_pfn << PAGE_SHIFT,
+ (end_pfn - start_pfn) << PAGE_SHIFT,
+ &memblock.memory, 0);
+ }
+
+ /* free bootmem is whole main memory */
+ free_bootmem_with_active_regions(0, max_low_pfn);
+
+ /* reserve allocate blocks */
+ for_each_memblock(reserved, reg) {
+ 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);
+ }
+ }
+
+ /* XXX need to clip this if using highmem? */
+ sparse_memory_present_with_active_regions(0);
+
+#ifdef CONFIG_MMU
+ init_bootmem_done = 1;
+#endif
+ paging_init();
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+ free_reserved_area((void *)start, (void *)end, -1, "initrd");
+}
+#endif
+
+void free_initmem(void)
+{
+ free_initmem_default(-1);
+}
+
+void __init mem_init(void)
+{
+ high_memory = (void *)__va(memory_start + lowmem_size - 1);
+
+ /* this will put all memory onto the freelists */
+ free_all_bootmem();
+#ifdef CONFIG_HIGHMEM
+ highmem_setup();
+#endif
+
+ mem_init_print_info(NULL);
+#ifdef CONFIG_MMU
+ pr_info("Kernel virtual memory layout:\n");
+ pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
+#ifdef CONFIG_HIGHMEM
+ pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
+ PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
+#endif /* CONFIG_HIGHMEM */
+ pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
+ ioremap_bot, ioremap_base);
+ pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
+ (unsigned long)VMALLOC_START, VMALLOC_END);
+#endif
+ mem_init_done = 1;
+}
+
+#ifndef CONFIG_MMU
+int page_is_ram(unsigned long pfn)
+{
+ return __range_ok(pfn, 0);
+}
+#else
+int page_is_ram(unsigned long pfn)
+{
+ return pfn < max_low_pfn;
+}
+
+/*
+ * Check for command-line options that affect what MMU_init will do.
+ */
+static void mm_cmdline_setup(void)
+{
+ unsigned long maxmem = 0;
+ char *p = cmd_line;
+
+ /* Look for mem= option on command line */
+ p = strstr(cmd_line, "mem=");
+ if (p) {
+ p += 4;
+ maxmem = memparse(p, &p);
+ if (maxmem && memory_size > maxmem) {
+ memory_size = maxmem;
+ memblock.memory.regions[0].size = memory_size;
+ }
+ }
+}
+
+/*
+ * MMU_init_hw does the chip-specific initialization of the MMU hardware.
+ */
+static void __init mmu_init_hw(void)
+{
+ /*
+ * The Zone Protection Register (ZPR) defines how protection will
+ * be applied to every page which is a member of a given zone. At
+ * present, we utilize only two of the zones.
+ * The zone index bits (of ZSEL) in the PTE are used for software
+ * indicators, except the LSB. For user access, zone 1 is used,
+ * for kernel access, zone 0 is used. We set all but zone 1
+ * to zero, allowing only kernel access as indicated in the PTE.
+ * For zone 1, we set a 01 binary (a value of 10 will not work)
+ * to allow user access as indicated in the PTE. This also allows
+ * kernel access as indicated in the PTE.
+ */
+ __asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
+ "mts rzpr, r11;"
+ : : : "r11");
+}
+
+/*
+ * MMU_init sets up the basic memory mappings for the kernel,
+ * including both RAM and possibly some I/O regions,
+ * and sets up the page tables and the MMU hardware ready to go.
+ */
+
+/* called from head.S */
+asmlinkage void __init mmu_init(void)
+{
+ unsigned int kstart, ksize;
+
+ if (!memblock.reserved.cnt) {
+ pr_emerg("Error memory count\n");
+ machine_restart(NULL);
+ }
+
+ if ((u32) memblock.memory.regions[0].size < 0x400000) {
+ pr_emerg("Memory must be greater than 4MB\n");
+ machine_restart(NULL);
+ }
+
+ if ((u32) memblock.memory.regions[0].size < kernel_tlb) {
+ pr_emerg("Kernel size is greater than memory node\n");
+ machine_restart(NULL);
+ }
+
+ /* Find main memory where the kernel is */
+ memory_start = (u32) memblock.memory.regions[0].base;
+ lowmem_size = memory_size = (u32) memblock.memory.regions[0].size;
+
+ if (lowmem_size > CONFIG_LOWMEM_SIZE) {
+ lowmem_size = CONFIG_LOWMEM_SIZE;
+#ifndef CONFIG_HIGHMEM
+ memory_size = lowmem_size;
+#endif
+ }
+
+ mm_cmdline_setup(); /* FIXME parse args from command line - not used */
+
+ /*
+ * Map out the kernel text/data/bss from the available physical
+ * memory.
+ */
+ kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
+ /* kernel size */
+ ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
+ memblock_reserve(kstart, ksize);
+
+#if defined(CONFIG_BLK_DEV_INITRD)
+ /* Remove the init RAM disk from the available memory. */
+ if (initrd_start) {
+ unsigned long size;
+ size = initrd_end - initrd_start;
+ memblock_reserve(__virt_to_phys(initrd_start), size);
+ }
+#endif /* CONFIG_BLK_DEV_INITRD */
+
+ /* Initialize the MMU hardware */
+ mmu_init_hw();
+
+ /* Map in all of RAM starting at CONFIG_KERNEL_START */
+ mapin_ram();
+
+ /* Extend vmalloc and ioremap area as big as possible */
+#ifdef CONFIG_HIGHMEM
+ ioremap_base = ioremap_bot = PKMAP_BASE;
+#else
+ ioremap_base = ioremap_bot = FIXADDR_START;
+#endif
+
+ /* 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. */
+void __init *early_get_page(void)
+{
+ void *p;
+ if (init_bootmem_done) {
+ p = alloc_bootmem_pages(PAGE_SIZE);
+ } else {
+ /*
+ * Mem start + kernel_tlb -> here is limit
+ * because of mem mapping from head.S
+ */
+ p = __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE,
+ memory_start + kernel_tlb));
+ }
+ return p;
+}
+
+#endif /* CONFIG_MMU */
+
+void * __init_refok alloc_maybe_bootmem(size_t size, gfp_t mask)
+{
+ if (mem_init_done)
+ return kmalloc(size, mask);
+ else
+ return alloc_bootmem(size);
+}
+
+void * __init_refok zalloc_maybe_bootmem(size_t size, gfp_t mask)
+{
+ void *p;
+
+ if (mem_init_done)
+ p = kzalloc(size, mask);
+ else {
+ p = alloc_bootmem(size);
+ if (p)
+ memset(p, 0, size);
+ }
+ return p;
+}