arch/v850/kernel/setup.c

   1 /*
   2  * arch/v850/kernel/setup.c -- Arch-dependent initialization functions
   3  *
   4  *  Copyright (C) 2001,02,03  NEC Electronics Corporation
   5  *  Copyright (C) 2001,02,03  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 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 (saved_command_line, command_line, COMMAND_LINE_SIZE);
  68         saved_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 /* Set the root filesystem to be the given memory region.
 102    Some parameter may be appended to CMD_LINE.  */
 103 void set_mem_root (void *addr, size_t len, char *cmd_line)
 104 {
 105         /* The only way to pass info to the MTD slram driver is via
 106            the command line.  */
 107         if (*cmd_line) {
 108                 cmd_line += strlen (cmd_line);
 109                 *cmd_line++ = ' ';
 110         }
 111         sprintf (cmd_line, "slram=root,0x%x,+0x%x", (u32)addr, (u32)len);
 112
 113         ROOT_DEV = MKDEV (MTD_BLOCK_MAJOR, 0);
 114 }
 115 #endif
 116
 117 \f
 118 static void irq_nop (unsigned irq) { }
 119 static unsigned irq_zero (unsigned irq) { return 0; }
 120
 121 static void nmi_end (unsigned irq)
 122 {
 123         if (irq != IRQ_NMI (0)) {
 124                 printk (KERN_CRIT "NMI %d is unrecoverable; restarting...",
 125                         irq - IRQ_NMI (0));
 126                 machine_restart (0);
 127         }
 128 }
 129
 130 static struct hw_interrupt_type nmi_irq_type = {
 131         "NMI",
 132         irq_zero,               /* startup */
 133         irq_nop,                /* shutdown */
 134         irq_nop,                /* enable */
 135         irq_nop,                /* disable */
 136         irq_nop,                /* ack */
 137         nmi_end,                /* end */
 138 };
 139
 140 void __init init_IRQ (void)
 141 {
 142         init_irq_handlers (0, NUM_MACH_IRQS, 1, 0);
 143         init_irq_handlers (IRQ_NMI (0), NUM_NMIS, 1, &nmi_irq_type);
 144         mach_init_irqs ();
 145 }
 146
 147 \f
 148 void __init mem_init (void)
 149 {
 150         max_mapnr = MAP_NR (ram_start + ram_len);
 151
 152         num_physpages = ADDR_TO_PAGE (ram_len);
 153
 154         total_ram_pages = free_all_bootmem ();
 155
 156         printk (KERN_INFO
 157                 "Memory: %luK/%luK available"
 158                 " (%luK kernel code, %luK data)\n",
 159                 PAGE_TO_ADDR (nr_free_pages()) / 1024,
 160                 ram_len / 1024,
 161                 ((unsigned long)&_etext - (unsigned long)&_stext) / 1024,
 162                 ((unsigned long)&_ebss - (unsigned long)&_sdata) / 1024);
 163 }
 164
 165 void free_initmem (void)
 166 {
 167         unsigned long ram_end = ram_start + ram_len;
 168         unsigned long start = PAGE_ALIGN ((unsigned long)(&_init_start));
 169
 170         if (start >= ram_start && start < ram_end) {
 171                 unsigned long addr;
 172                 unsigned long end = PAGE_ALIGN ((unsigned long)(&_init_end));
 173
 174                 if (end > ram_end)
 175                         end = ram_end;
 176
 177                 printk("Freeing unused kernel memory: %ldK freed\n",
 178                        (end - start) / 1024);
 179
 180                 for (addr = start; addr < end; addr += PAGE_SIZE) {
 181                         struct page *page = virt_to_page (addr);
 182                         ClearPageReserved (page);
 183                         set_page_count (page, 1);
 184                         __free_page (page);
 185                         total_ram_pages++;
 186                 }
 187         }
 188 }
 189
 190 \f
 191 /* Initialize the `bootmem allocator'.  RAM_START and RAM_LEN identify
 192    what RAM may be used.  */
 193 static void __init
 194 init_bootmem_alloc (unsigned long ram_start, unsigned long ram_len)
 195 {
 196         /* The part of the kernel that's in the same managed RAM space
 197            used for general allocation.  */
 198         unsigned long kram_start = (unsigned long)&_kram_start;
 199         unsigned long kram_end = (unsigned long)&_kram_end;
 200         /* End of the managed RAM space.  */
 201         unsigned long ram_end = ram_start + ram_len;
 202         /* Address range of the interrupt vector table.  */
 203         unsigned long intv_start = (unsigned long)&_intv_start;
 204         unsigned long intv_end = (unsigned long)&_intv_end;
 205         /* True if the interrupt vectors are in the managed RAM area.  */
 206         int intv_in_ram = (intv_end > ram_start && intv_start < ram_end);
 207         /* True if the interrupt vectors are inside the kernel's RAM.  */
 208         int intv_in_kram = (intv_end > kram_start && intv_start < kram_end);
 209         /* A pointer to an optional function that reserves platform-specific
 210            memory regions.  We declare the pointer `volatile' to avoid gcc
 211            turning the call into a static call (the problem is that since
 212            it's a weak symbol, a static call may end up trying to reference
 213            the location 0x0, which is not always reachable).  */
 214         void (*volatile mrb) (void) = mach_reserve_bootmem;
 215         /* The bootmem allocator's allocation bitmap.  */
 216         unsigned long bootmap = (unsigned long)&_bootmap;
 217         unsigned long bootmap_len;
 218
 219         /* Round bootmap location up to next page.  */
 220         bootmap = PAGE_TO_ADDR (ADDR_TO_PAGE_UP (bootmap));
 221
 222         /* Initialize bootmem allocator.  */
 223         bootmap_len = init_bootmem_node (NODE_DATA (0),
 224                                          ADDR_TO_PAGE (bootmap),
 225                                          ADDR_TO_PAGE (PAGE_OFFSET),
 226                                          ADDR_TO_PAGE (ram_end));
 227
 228         /* Now make the RAM actually allocatable (it starts out `reserved'). */
 229         free_bootmem (ram_start, ram_len);
 230
 231         if (kram_end > kram_start)
 232                 /* Reserve the RAM part of the kernel's address space, so it
 233                    doesn't get allocated.  */
 234                 reserve_bootmem (kram_start, kram_end - kram_start);
 235
 236         if (intv_in_ram && !intv_in_kram)
 237                 /* Reserve the interrupt vector space.  */
 238                 reserve_bootmem (intv_start, intv_end - intv_start);
 239
 240         if (bootmap >= ram_start && bootmap < ram_end)
 241                 /* Reserve the bootmap space.  */
 242                 reserve_bootmem (bootmap, bootmap_len);
 243
 244         /* Reserve the memory used by the root filesystem image if it's
 245            in RAM.  */
 246         if (&_root_fs_image_end > &_root_fs_image_start
 247             && (unsigned long)&_root_fs_image_start >= ram_start
 248             && (unsigned long)&_root_fs_image_start < ram_end)
 249                 reserve_bootmem ((unsigned long)&_root_fs_image_start,
 250                                  &_root_fs_image_end - &_root_fs_image_start);
 251
 252         /* Let the platform-dependent code reserve some too.  */
 253         if (mrb)
 254                 (*mrb) ();
 255 }
 256
 257 /* Tell the kernel about what RAM it may use for memory allocation.  */
 258 static void __init
 259 init_mem_alloc (unsigned long ram_start, unsigned long ram_len)
 260 {
 261         unsigned i;
 262         unsigned long zones_size[MAX_NR_ZONES];
 263
 264         init_bootmem_alloc (ram_start, ram_len);
 265
 266         for (i = 0; i < MAX_NR_ZONES; i++)
 267                 zones_size[i] = 0;
 268
 269         /* We stuff all the memory into one area, which includes the
 270            initial gap from PAGE_OFFSET to ram_start.  */
 271         zones_size[ZONE_DMA]
 272                 = ADDR_TO_PAGE (ram_len + (ram_start - PAGE_OFFSET));
 273
 274         /* The allocator is very picky about the address of the first
 275            allocatable page -- it must be at least as aligned as the
 276            maximum allocation -- so try to detect cases where it will get
 277            confused and signal them at compile time (this is a common
 278            problem when porting to a new platform with ).  There is a
 279            similar runtime check in free_area_init_core.  */
 280 #if ((PAGE_OFFSET >> PAGE_SHIFT) & ((1UL << (MAX_ORDER - 1)) - 1))
 281 #error MAX_ORDER is too large for given PAGE_OFFSET (use CONFIG_FORCE_MAX_ZONEORDER to change it)
 282 #endif
 283         NODE_DATA(0)->node_mem_map = NULL;
 284         free_area_init_node (0, NODE_DATA(0), zones_size,
 285                              ADDR_TO_PAGE (PAGE_OFFSET), 0);
 286 }