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-rw-r--r--arch/microblaze/mm/init.c349
1 files changed, 349 insertions, 0 deletions
diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
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+++ b/arch/microblaze/mm/init.c
@@ -0,0 +1,349 @@
+/*
+ * 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/dma-map-ops.h>
+#include <linux/memblock.h>
+#include <linux/init.h>
+#include <linux/kernel.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);
+#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;
+
+EXPORT_SYMBOL(min_low_pfn);
+EXPORT_SYMBOL(max_low_pfn);
+
+#ifdef CONFIG_HIGHMEM
+pte_t *kmap_pte;
+EXPORT_SYMBOL(kmap_pte);
+
+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));
+}
+
+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(zones_size);
+}
+
+void __init setup_memory(void)
+{
+#ifndef CONFIG_MMU
+ u32 kernel_align_start, kernel_align_size;
+ phys_addr_t start, end;
+ u64 i;
+
+ /* Find main memory where is the kernel */
+ for_each_mem_range(i, &start, &end) {
+ memory_start = start;
+ lowmem_size = end - start;
+ 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);
+
+ paging_init();
+}
+
+void __init mem_init(void)
+{
+ high_memory = (void *)__va(memory_start + lowmem_size - 1);
+
+ /* this will put all memory onto the freelists */
+ memblock_free_all();
+#ifdef CONFIG_HIGHMEM
+ highmem_setup();
+#endif
+
+ mem_init_print_info(NULL);
+ 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);
+
+ parse_early_param();
+
+ /* CMA initialization */
+ dma_contiguous_reserve(memory_start + lowmem_size - 1);
+}
+
+/* This is only called until mem_init is done. */
+void __init *early_get_page(void)
+{
+ /*
+ * Mem start + kernel_tlb -> here is limit
+ * because of mem mapping from head.S
+ */
+ return memblock_alloc_try_nid_raw(PAGE_SIZE, PAGE_SIZE,
+ MEMBLOCK_LOW_LIMIT, memory_start + kernel_tlb,
+ NUMA_NO_NODE);
+}
+
+#endif /* CONFIG_MMU */
+
+void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
+{
+ void *p;
+
+ if (mem_init_done) {
+ p = kzalloc(size, mask);
+ } else {
+ p = memblock_alloc(size, SMP_CACHE_BYTES);
+ if (!p)
+ panic("%s: Failed to allocate %zu bytes\n",
+ __func__, size);
+ }
+
+ return p;
+}