arch/v850/kernel/setup.c

   1 /*
   2  * arch/v850/kernel/setup.c -- Arch-dependent initialization functions
   3  *
   4  *  Copyright (C) 2001,02,03,05,06  NEC Electronics Corporation
   5  *  Copyright (C) 2001,02,03,05,06  Miles Bader <miles@gnu.org>
   6  *
   7  * This file is subject to the terms and conditions of the GNU General
   8  * Public License.  See the file COPYING in the main directory of this
   9  * archive for more details.
  10  *
  11  * Written by Miles Bader <miles@gnu.org>
  12  */
  13
  14 #include <linux/mm.h>
  15 #include <linux/bootmem.h>
  16 #include <linux/swap.h>         /* we don't have swap, but for nr_free_pages */
  17 #include <linux/irq.h>
  18 #include <linux/reboot.h>
  19 #include <linux/personality.h>
  20 #include <linux/major.h>
  21 #include <linux/root_dev.h>
  22 #include <linux/mtd/mtd.h>
  23 #include <linux/init.h>
  24
  25 #include <asm/irq.h>
  26 #include <asm/setup.h>
  27
  28 #include "mach.h"
  29
  30 /* These symbols are all defined in the linker map to delineate various
  31    statically allocated regions of memory.  */
  32
  33 extern char _intv_start, _intv_end;
  34 /* `kram' is only used if the kernel uses part of normal user RAM.  */
  35 extern char _kram_start __attribute__ ((__weak__));
  36 extern char _kram_end __attribute__ ((__weak__));
  37 extern char _init_start, _init_end;
  38 extern char _bootmap;
  39 extern char _stext, _etext, _sdata, _edata, _sbss, _ebss;
  40 /* Many platforms use an embedded root image.  */
  41 extern char _root_fs_image_start __attribute__ ((__weak__));
  42 extern char _root_fs_image_end __attribute__ ((__weak__));
  43
  44
  45 char __initdata command_line[COMMAND_LINE_SIZE];
  46
  47 /* Memory not used by the kernel.  */
  48 static unsigned long total_ram_pages;
  49
  50 /* System RAM.  */
  51 static unsigned long ram_start = 0, ram_len = 0;
  52
  53
  54 #define ADDR_TO_PAGE_UP(x)   ((((unsigned long)x) + PAGE_SIZE-1) >> PAGE_SHIFT)
  55 #define ADDR_TO_PAGE(x)      (((unsigned long)x) >> PAGE_SHIFT)
  56 #define PAGE_TO_ADDR(x)      (((unsigned long)x) << PAGE_SHIFT)
  57
  58 static void init_mem_alloc (unsigned long ram_start, unsigned long ram_len);
  59
  60 void set_mem_root (void *addr, size_t len, char *cmd_line);
  61
  62
  63 void __init setup_arch (char **cmdline)
  64 {
  65         /* Keep a copy of command line */
  66         *cmdline = command_line;
  67         memcpy (boot_command_line, command_line, COMMAND_LINE_SIZE);
  68         boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
  69
  70         console_verbose ();
  71
  72         init_mm.start_code = (unsigned long) &_stext;
  73         init_mm.end_code = (unsigned long) &_etext;
  74         init_mm.end_data = (unsigned long) &_edata;
  75         init_mm.brk = (unsigned long) &_kram_end;
  76
  77         /* Find out what mem this machine has.  */
  78         mach_get_physical_ram (&ram_start, &ram_len);
  79         /* ... and tell the kernel about it.  */
  80         init_mem_alloc (ram_start, ram_len);
  81
  82         printk (KERN_INFO "CPU: %s\nPlatform: %s\n",
  83                 CPU_MODEL_LONG, PLATFORM_LONG);
  84
  85         /* do machine-specific setups.  */
  86         mach_setup (cmdline);
  87
  88 #ifdef CONFIG_MTD
  89         if (!ROOT_DEV && &_root_fs_image_end > &_root_fs_image_start)
  90                 set_mem_root (&_root_fs_image_start,
  91                               &_root_fs_image_end - &_root_fs_image_start,
  92                               *cmdline);
  93 #endif
  94 }
  95
  96 void __init trap_init (void)
  97 {
  98 }
  99
 100 #ifdef CONFIG_MTD
 101
 102 /* From drivers/mtd/devices/slram.c */
 103 #define SLRAM_BLK_SZ 0x4000
 104
 105 /* Set the root filesystem to be the given memory region.
 106    Some parameter may be appended to CMD_LINE.  */
 107 void set_mem_root (void *addr, size_t len, char *cmd_line)
 108 {
 109         /* Some sort of idiocy in MTD means we must supply a length that's
 110            a multiple of SLRAM_BLK_SZ.  We just round up the real length,
 111            as the file system shouldn't attempt to access anything beyond
 112            the end of the image anyway.  */
 113         len = (((len - 1) + SLRAM_BLK_SZ) / SLRAM_BLK_SZ) * SLRAM_BLK_SZ;
 114
 115         /* The only way to pass info to the MTD slram driver is via
 116            the command line.  */
 117         if (*cmd_line) {
 118                 cmd_line += strlen (cmd_line);
 119                 *cmd_line++ = ' ';
 120         }
 121         sprintf (cmd_line, "slram=root,0x%x,+0x%x", (u32)addr, (u32)len);
 122
 123         ROOT_DEV = MKDEV (MTD_BLOCK_MAJOR, 0);
 124 }
 125 #endif
 126
 127 \f
 128 static void irq_nop (unsigned irq) { }
 129 static unsigned irq_zero (unsigned irq) { return 0; }
 130
 131 static void nmi_end (unsigned irq)
 132 {
 133         if (irq != IRQ_NMI (0)) {
 134                 printk (KERN_CRIT "NMI %d is unrecoverable; restarting...",
 135                         irq - IRQ_NMI (0));
 136                 machine_restart (0);
 137         }
 138 }
 139
 140 static struct hw_interrupt_type nmi_irq_type = {
 141         .typename = "NMI",
 142         .startup = irq_zero,            /* startup */
 143         .shutdown = irq_nop,            /* shutdown */
 144         .enable = irq_nop,              /* enable */
 145         .disable = irq_nop,             /* disable */
 146         .ack = irq_nop,         /* ack */
 147         .end = nmi_end,         /* end */
 148 };
 149
 150 void __init init_IRQ (void)
 151 {
 152         init_irq_handlers (0, NUM_MACH_IRQS, 1, 0);
 153         init_irq_handlers (IRQ_NMI (0), NUM_NMIS, 1, &nmi_irq_type);
 154         mach_init_irqs ();
 155 }
 156
 157 \f
 158 void __init mem_init (void)
 159 {
 160         max_mapnr = MAP_NR (ram_start + ram_len);
 161
 162         num_physpages = ADDR_TO_PAGE (ram_len);
 163
 164         total_ram_pages = free_all_bootmem ();
 165
 166         printk (KERN_INFO
 167                 "Memory: %luK/%luK available"
 168                 " (%luK kernel code, %luK data)\n",
 169                 PAGE_TO_ADDR (nr_free_pages()) / 1024,
 170                 ram_len / 1024,
 171                 ((unsigned long)&_etext - (unsigned long)&_stext) / 1024,
 172                 ((unsigned long)&_ebss - (unsigned long)&_sdata) / 1024);
 173 }
 174
 175 void free_initmem (void)
 176 {
 177         unsigned long ram_end = ram_start + ram_len;
 178         unsigned long start = PAGE_ALIGN ((unsigned long)(&_init_start));
 179
 180         if (start >= ram_start && start < ram_end) {
 181                 unsigned long addr;
 182                 unsigned long end = PAGE_ALIGN ((unsigned long)(&_init_end));
 183
 184                 if (end > ram_end)
 185                         end = ram_end;
 186
 187                 printk("Freeing unused kernel memory: %ldK freed\n",
 188                        (end - start) / 1024);
 189
 190                 for (addr = start; addr < end; addr += PAGE_SIZE) {
 191                         struct page *page = virt_to_page (addr);
 192                         ClearPageReserved (page);
 193                         init_page_count (page);
 194                         __free_page (page);
 195                         total_ram_pages++;
 196                 }
 197         }
 198 }
 199
 200 \f
 201 /* Initialize the `bootmem allocator'.  RAM_START and RAM_LEN identify
 202    what RAM may be used.  */
 203 static void __init
 204 init_bootmem_alloc (unsigned long ram_start, unsigned long ram_len)
 205 {
 206         /* The part of the kernel that's in the same managed RAM space
 207            used for general allocation.  */
 208         unsigned long kram_start = (unsigned long)&_kram_start;
 209         unsigned long kram_end = (unsigned long)&_kram_end;
 210         /* End of the managed RAM space.  */
 211         unsigned long ram_end = ram_start + ram_len;
 212         /* Address range of the interrupt vector table.  */
 213         unsigned long intv_start = (unsigned long)&_intv_start;
 214         unsigned long intv_end = (unsigned long)&_intv_end;
 215         /* True if the interrupt vectors are in the managed RAM area.  */
 216         int intv_in_ram = (intv_end > ram_start && intv_start < ram_end);
 217         /* True if the interrupt vectors are inside the kernel's RAM.  */
 218         int intv_in_kram = (intv_end > kram_start && intv_start < kram_end);
 219         /* A pointer to an optional function that reserves platform-specific
 220            memory regions.  We declare the pointer `volatile' to avoid gcc
 221            turning the call into a static call (the problem is that since
 222            it's a weak symbol, a static call may end up trying to reference
 223            the location 0x0, which is not always reachable).  */
 224         void (*volatile mrb) (void) = mach_reserve_bootmem;
 225         /* The bootmem allocator's allocation bitmap.  */
 226         unsigned long bootmap = (unsigned long)&_bootmap;
 227         unsigned long bootmap_len;
 228
 229         /* Round bootmap location up to next page.  */
 230         bootmap = PAGE_TO_ADDR (ADDR_TO_PAGE_UP (bootmap));
 231
 232         /* Initialize bootmem allocator.  */
 233         bootmap_len = init_bootmem_node (NODE_DATA (0),
 234                                          ADDR_TO_PAGE (bootmap),
 235                                          ADDR_TO_PAGE (PAGE_OFFSET),
 236                                          ADDR_TO_PAGE (ram_end));
 237
 238         /* Now make the RAM actually allocatable (it starts out `reserved'). */
 239         free_bootmem (ram_start, ram_len);
 240
 241         if (kram_end > kram_start)
 242                 /* Reserve the RAM part of the kernel's address space, so it
 243                    doesn't get allocated.  */
 244                 reserve_bootmem(kram_start, kram_end - kram_start,
 245                                 BOOTMEM_DEFAULT);
 246
 247         if (intv_in_ram && !intv_in_kram)
 248                 /* Reserve the interrupt vector space.  */
 249                 reserve_bootmem(intv_start, intv_end - intv_start,
 250                                 BOOTMEM_DEFAULT);
 251
 252         if (bootmap >= ram_start && bootmap < ram_end)
 253                 /* Reserve the bootmap space.  */
 254                 reserve_bootmem(bootmap, bootmap_len,
 255                                 BOOTMEM_DEFAULT);
 256
 257         /* Reserve the memory used by the root filesystem image if it's
 258            in RAM.  */
 259         if (&_root_fs_image_end > &_root_fs_image_start
 260             && (unsigned long)&_root_fs_image_start >= ram_start
 261             && (unsigned long)&_root_fs_image_start < ram_end)
 262                 reserve_bootmem ((unsigned long)&_root_fs_image_start,
 263                                  &_root_fs_image_end - &_root_fs_image_start,
 264                                  BOOTMEM_DEFAULT);
 265
 266         /* Let the platform-dependent code reserve some too.  */
 267         if (mrb)
 268                 (*mrb) ();
 269 }
 270
 271 /* Tell the kernel about what RAM it may use for memory allocation.  */
 272 static void __init
 273 init_mem_alloc (unsigned long ram_start, unsigned long ram_len)
 274 {
 275         unsigned i;
 276         unsigned long zones_size[MAX_NR_ZONES];
 277
 278         init_bootmem_alloc (ram_start, ram_len);
 279
 280         for (i = 0; i < MAX_NR_ZONES; i++)
 281                 zones_size[i] = 0;
 282
 283         /* We stuff all the memory into one area, which includes the
 284            initial gap from PAGE_OFFSET to ram_start.  */
 285         zones_size[ZONE_DMA]
 286                 = ADDR_TO_PAGE (ram_len + (ram_start - PAGE_OFFSET));
 287
 288         /* The allocator is very picky about the address of the first
 289            allocatable page -- it must be at least as aligned as the
 290            maximum allocation -- so try to detect cases where it will get
 291            confused and signal them at compile time (this is a common
 292            problem when porting to a new platform with ).  There is a
 293            similar runtime check in free_area_init_core.  */
 294 #if ((PAGE_OFFSET >> PAGE_SHIFT) & ((1UL << (MAX_ORDER - 1)) - 1))
 295 #error MAX_ORDER is too large for given PAGE_OFFSET (use CONFIG_FORCE_MAX_ZONEORDER to change it)
 296 #endif
 297         NODE_DATA(0)->node_mem_map = NULL;
 298         free_area_init_node (0, NODE_DATA(0), zones_size,
 299                              ADDR_TO_PAGE (PAGE_OFFSET), 0);
 300 }
 301
 302 \f
 303
 304 /* Taken from m68knommu */
 305 void show_mem(void)
 306 {
 307     unsigned long i;
 308     int free = 0, total = 0, reserved = 0, shared = 0;
 309     int cached = 0;
 310
 311     printk(KERN_INFO "\nMem-info:\n");
 312     show_free_areas();
 313     i = max_mapnr;
 314     while (i-- > 0) {
 315         total++;
 316         if (PageReserved(mem_map+i))
 317             reserved++;
 318         else if (PageSwapCache(mem_map+i))
 319             cached++;
 320         else if (!page_count(mem_map+i))
 321             free++;
 322         else
 323             shared += page_count(mem_map+i) - 1;
 324     }
 325     printk(KERN_INFO "%d pages of RAM\n",total);
 326     printk(KERN_INFO "%d free pages\n",free);
 327     printk(KERN_INFO "%d reserved pages\n",reserved);
 328     printk(KERN_INFO "%d pages shared\n",shared);
 329     printk(KERN_INFO "%d pages swap cached\n",cached);
 330 }