microblaze_mmu_v2: MMU initialization
Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek
parent
3f50425c0c
commit
4dc60832f5
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@ -23,18 +23,26 @@
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#include <asm/sections.h>
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#include <asm/tlb.h>
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#ifndef CONFIG_MMU
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unsigned int __page_offset;
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EXPORT_SYMBOL(__page_offset);
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#else
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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int mem_init_done;
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static int init_bootmem_done;
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#endif /* CONFIG_MMU */
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char *klimit = _end;
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/*
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* Initialize the bootmem system and give it all the memory we
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* have available.
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*/
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unsigned int memory_start;
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unsigned int memory_end; /* due to mm/nommu.c */
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unsigned int memory_size;
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unsigned long memory_start;
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unsigned long memory_end; /* due to mm/nommu.c */
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unsigned long memory_size;
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/*
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* paging_init() sets up the page tables - in fact we've already done this.
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@ -59,6 +67,7 @@ void __init setup_memory(void)
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{
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int i;
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unsigned long map_size;
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#ifndef CONFIG_MMU
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u32 kernel_align_start, kernel_align_size;
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/* Find main memory where is the kernel */
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@ -91,6 +100,7 @@ void __init setup_memory(void)
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__func__, kernel_align_start, kernel_align_start
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+ kernel_align_size, kernel_align_size);
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#endif
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/*
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* Kernel:
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* start: base phys address of kernel - page align
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@ -119,9 +129,13 @@ void __init setup_memory(void)
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* for 4GB of memory, using 4kB pages), plus 1 page
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* (in case the address isn't page-aligned).
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*/
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#ifndef CONFIG_MMU
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map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)_end)),
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min_low_pfn, max_low_pfn);
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#else
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map_size = init_bootmem_node(&contig_page_data,
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PFN_UP(TOPHYS((u32)_end)), min_low_pfn, max_low_pfn);
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#endif
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lmb_reserve(PFN_UP(TOPHYS((u32)_end)) << PAGE_SHIFT, map_size);
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/* free bootmem is whole main memory */
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@ -135,6 +149,9 @@ void __init setup_memory(void)
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reserve_bootmem(lmb.reserved.region[i].base,
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lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT);
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}
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#ifdef CONFIG_MMU
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init_bootmem_done = 1;
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#endif
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paging_init();
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}
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@ -189,8 +206,12 @@ void __init mem_init(void)
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printk(KERN_INFO "Memory: %luk/%luk available\n",
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(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
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num_physpages << (PAGE_SHIFT-10));
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#ifdef CONFIG_MMU
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mem_init_done = 1;
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#endif
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}
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#ifndef CONFIG_MMU
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/* Check against bounds of physical memory */
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int ___range_ok(unsigned long addr, unsigned long size)
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{
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@ -198,3 +219,132 @@ int ___range_ok(unsigned long addr, unsigned long size)
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((addr + size) > memory_end));
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}
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EXPORT_SYMBOL(___range_ok);
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#else
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int page_is_ram(unsigned long pfn)
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{
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return pfn < max_low_pfn;
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}
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/*
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* Check for command-line options that affect what MMU_init will do.
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*/
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static void mm_cmdline_setup(void)
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{
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unsigned long maxmem = 0;
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char *p = cmd_line;
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/* Look for mem= option on command line */
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p = strstr(cmd_line, "mem=");
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if (p) {
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p += 4;
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maxmem = memparse(p, &p);
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if (maxmem && memory_size > maxmem) {
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memory_size = maxmem;
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memory_end = memory_start + memory_size;
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lmb.memory.region[0].size = memory_size;
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}
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}
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}
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/*
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* MMU_init_hw does the chip-specific initialization of the MMU hardware.
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*/
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static void __init mmu_init_hw(void)
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{
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/*
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* The Zone Protection Register (ZPR) defines how protection will
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* be applied to every page which is a member of a given zone. At
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* present, we utilize only two of the zones.
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* The zone index bits (of ZSEL) in the PTE are used for software
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* indicators, except the LSB. For user access, zone 1 is used,
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* for kernel access, zone 0 is used. We set all but zone 1
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* to zero, allowing only kernel access as indicated in the PTE.
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* For zone 1, we set a 01 binary (a value of 10 will not work)
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* to allow user access as indicated in the PTE. This also allows
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* kernel access as indicated in the PTE.
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*/
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__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
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"mts rzpr, r11;"
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: : : "r11");
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}
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/*
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* MMU_init sets up the basic memory mappings for the kernel,
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* including both RAM and possibly some I/O regions,
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* and sets up the page tables and the MMU hardware ready to go.
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*/
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/* called from head.S */
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asmlinkage void __init mmu_init(void)
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{
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unsigned int kstart, ksize;
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if (!lmb.reserved.cnt) {
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printk(KERN_EMERG "Error memory count\n");
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machine_restart(NULL);
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}
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if ((u32) lmb.memory.region[0].size < 0x1000000) {
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printk(KERN_EMERG "Memory must be greater than 16MB\n");
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machine_restart(NULL);
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}
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/* Find main memory where the kernel is */
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memory_start = (u32) lmb.memory.region[0].base;
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memory_end = (u32) lmb.memory.region[0].base +
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(u32) lmb.memory.region[0].size;
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memory_size = memory_end - memory_start;
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mm_cmdline_setup(); /* FIXME parse args from command line - not used */
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/*
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* Map out the kernel text/data/bss from the available physical
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* memory.
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*/
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kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
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/* kernel size */
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ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
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lmb_reserve(kstart, ksize);
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#if defined(CONFIG_BLK_DEV_INITRD)
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/* Remove the init RAM disk from the available memory. */
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/* if (initrd_start) {
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mem_pieces_remove(&phys_avail, __pa(initrd_start),
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initrd_end - initrd_start, 1);
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}*/
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#endif /* CONFIG_BLK_DEV_INITRD */
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/* Initialize the MMU hardware */
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mmu_init_hw();
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/* Map in all of RAM starting at CONFIG_KERNEL_START */
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mapin_ram();
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#ifdef HIGHMEM_START_BOOL
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ioremap_base = HIGHMEM_START;
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#else
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ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */
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#endif /* CONFIG_HIGHMEM */
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ioremap_bot = ioremap_base;
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/* Initialize the context management stuff */
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mmu_context_init();
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}
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/* This is only called until mem_init is done. */
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void __init *early_get_page(void)
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{
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void *p;
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if (init_bootmem_done) {
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p = alloc_bootmem_pages(PAGE_SIZE);
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} else {
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/*
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* Mem start + 32MB -> here is limit
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* because of mem mapping from head.S
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*/
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p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE,
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memory_start + 0x2000000));
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}
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return p;
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}
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#endif /* CONFIG_MMU */
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