arch/microblaze/kernel/setup.c

   1 /*
   2  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
   3  * Copyright (C) 2007-2009 PetaLogix
   4  * Copyright (C) 2006 Atmark Techno, Inc.
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License. See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10
  11 #include <linux/init.h>
  12 #include <linux/string.h>
  13 #include <linux/seq_file.h>
  14 #include <linux/cpu.h>
  15 #include <linux/initrd.h>
  16 #include <linux/console.h>
  17 #include <linux/debugfs.h>
  18
  19 #include <asm/setup.h>
  20 #include <asm/sections.h>
  21 #include <asm/page.h>
  22 #include <linux/io.h>
  23 #include <linux/bug.h>
  24 #include <linux/param.h>
  25 #include <linux/cache.h>
  26 #include <asm/cacheflush.h>
  27 #include <asm/entry.h>
  28 #include <asm/cpuinfo.h>
  29
  30 #include <asm/system.h>
  31 #include <asm/prom.h>
  32 #include <asm/pgtable.h>
  33
  34 DEFINE_PER_CPU(unsigned int, KSP);      /* Saved kernel stack pointer */
  35 DEFINE_PER_CPU(unsigned int, KM);       /* Kernel/user mode */
  36 DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
  37 DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
  38 DEFINE_PER_CPU(unsigned int, CURRENT_SAVE);     /* Saved current pointer */
  39
  40 unsigned int boot_cpuid;
  41 char cmd_line[COMMAND_LINE_SIZE];
  42
  43 void __init setup_arch(char **cmdline_p)
  44 {
  45 #ifdef CONFIG_CMDLINE_FORCE
  46         strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
  47         strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
  48 #endif
  49         *cmdline_p = cmd_line;
  50
  51         console_verbose();
  52
  53         unflatten_device_tree();
  54
  55         /* NOTE I think that this function is not necessary to call */
  56         /* irq_early_init(); */
  57         setup_cpuinfo();
  58
  59         __invalidate_icache_all();
  60         __enable_icache();
  61
  62         __invalidate_dcache_all();
  63         __enable_dcache();
  64
  65         panic_timeout = 120;
  66
  67         setup_memory();
  68
  69 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
  70         printk(KERN_NOTICE "Self modified code enable\n");
  71 #endif
  72
  73 #ifdef CONFIG_VT
  74 #if defined(CONFIG_XILINX_CONSOLE)
  75         conswitchp = &xil_con;
  76 #elif defined(CONFIG_DUMMY_CONSOLE)
  77         conswitchp = &dummy_con;
  78 #endif
  79 #endif
  80 }
  81
  82 #ifdef CONFIG_MTD_UCLINUX
  83 /* Handle both romfs and cramfs types, without generating unnecessary
  84  code (ie no point checking for CRAMFS if it's not even enabled) */
  85 inline unsigned get_romfs_len(unsigned *addr)
  86 {
  87 #ifdef CONFIG_ROMFS_FS
  88         if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
  89                 return be32_to_cpu(addr[2]);
  90 #endif
  91
  92 #ifdef CONFIG_CRAMFS
  93         if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
  94                 return le32_to_cpu(addr[1]);
  95 #endif
  96         return 0;
  97 }
  98 #endif  /* CONFIG_MTD_UCLINUX_EBSS */
  99
 100 void __init machine_early_init(const char *cmdline, unsigned int ram,
 101                 unsigned int fdt)
 102 {
 103         unsigned long *src, *dst = (unsigned long *)0x0;
 104
 105 /* clearing bss section */
 106         memset(__bss_start, 0, __bss_stop-__bss_start);
 107         memset(_ssbss, 0, _esbss-_ssbss);
 108
 109         /*
 110          * Copy command line passed from bootloader, or use default
 111          * if none provided, or forced
 112          */
 113 #ifndef CONFIG_CMDLINE_BOOL
 114         if (cmdline && cmdline[0] != '\0')
 115                 strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
 116 #endif
 117
 118 /* initialize device tree for usage in early_printk */
 119         early_init_devtree((void *)_fdt_start);
 120
 121 #ifdef CONFIG_EARLY_PRINTK
 122         setup_early_printk(NULL);
 123 #endif
 124
 125         early_printk("Ramdisk addr 0x%08x, FDT 0x%08x\n", ram, fdt);
 126         printk(KERN_NOTICE "Found FDT at 0x%08x\n", fdt);
 127
 128 #ifdef CONFIG_MTD_UCLINUX
 129         {
 130                 int size;
 131                 unsigned int romfs_base;
 132                 romfs_base = (ram ? ram : (unsigned int)&__init_end);
 133                 /* if CONFIG_MTD_UCLINUX_EBSS is defined, assume ROMFS is at the
 134                  * end of kernel, which is ROMFS_LOCATION defined above. */
 135                 size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 136                 early_printk("Found romfs @ 0x%08x (0x%08x)\n",
 137                                 romfs_base, size);
 138                 early_printk("#### klimit %p ####\n", klimit);
 139                 BUG_ON(size < 0); /* What else can we do? */
 140
 141                 /* Use memmove to handle likely case of memory overlap */
 142                 early_printk("Moving 0x%08x bytes from 0x%08x to 0x%08x\n",
 143                         size, romfs_base, (unsigned)&_ebss);
 144                 memmove(&_ebss, (int *)romfs_base, size);
 145
 146                 /* update klimit */
 147                 klimit += PAGE_ALIGN(size);
 148                 early_printk("New klimit: 0x%08x\n", (unsigned)klimit);
 149         }
 150 #endif
 151
 152         for (src = __ivt_start; src < __ivt_end; src++, dst++)
 153                 *dst = *src;
 154
 155         /* Initialize global data */
 156         per_cpu(KM, 0) = 0x1;   /* We start in kernel mode */
 157         per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
 158 }
 159
 160 #ifdef CONFIG_DEBUG_FS
 161 struct dentry *of_debugfs_root;
 162
 163 static int microblaze_debugfs_init(void)
 164 {
 165         of_debugfs_root = debugfs_create_dir("microblaze", NULL);
 166
 167         return of_debugfs_root == NULL;
 168 }
 169 arch_initcall(microblaze_debugfs_init);
 170 #endif
 171
 172 void machine_restart(char *cmd)
 173 {
 174         printk(KERN_NOTICE "Machine restart...\n");
 175         dump_stack();
 176         while (1)
 177                 ;
 178 }
 179
 180 void machine_shutdown(void)
 181 {
 182         printk(KERN_NOTICE "Machine shutdown...\n");
 183         while (1)
 184                 ;
 185 }
 186
 187 void machine_halt(void)
 188 {
 189         printk(KERN_NOTICE "Machine halt...\n");
 190         while (1)
 191                 ;
 192 }
 193
 194 void machine_power_off(void)
 195 {
 196         printk(KERN_NOTICE "Machine power off...\n");
 197         while (1)
 198                 ;
 199 }