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         *cmdline_p = cmd_line;
  46
  47         console_verbose();
  48
  49         unflatten_device_tree();
  50
  51         /* NOTE I think that this function is not necessary to call */
  52         /* irq_early_init(); */
  53         setup_cpuinfo();
  54
  55         microblaze_cache_init();
  56
  57         invalidate_dcache();
  58         enable_dcache();
  59
  60         invalidate_icache();
  61         enable_icache();
  62
  63         setup_memory();
  64
  65 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
  66         printk(KERN_NOTICE "Self modified code enable\n");
  67 #endif
  68
  69 #ifdef CONFIG_VT
  70 #if defined(CONFIG_XILINX_CONSOLE)
  71         conswitchp = &xil_con;
  72 #elif defined(CONFIG_DUMMY_CONSOLE)
  73         conswitchp = &dummy_con;
  74 #endif
  75 #endif
  76 }
  77
  78 #ifdef CONFIG_MTD_UCLINUX
  79 /* Handle both romfs and cramfs types, without generating unnecessary
  80  code (ie no point checking for CRAMFS if it's not even enabled) */
  81 inline unsigned get_romfs_len(unsigned *addr)
  82 {
  83 #ifdef CONFIG_ROMFS_FS
  84         if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
  85                 return be32_to_cpu(addr[2]);
  86 #endif
  87
  88 #ifdef CONFIG_CRAMFS
  89         if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
  90                 return le32_to_cpu(addr[1]);
  91 #endif
  92         return 0;
  93 }
  94 #endif  /* CONFIG_MTD_UCLINUX_EBSS */
  95
  96 void __init machine_early_init(const char *cmdline, unsigned int ram,
  97                 unsigned int fdt, unsigned int msr)
  98 {
  99         unsigned long *src, *dst = (unsigned long *)0x0;
 100
 101         /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
 102          * end of kernel. There are two position which we want to check.
 103          * The first is __init_end and the second __bss_start.
 104          */
 105 #ifdef CONFIG_MTD_UCLINUX
 106         int romfs_size;
 107         unsigned int romfs_base;
 108         char *old_klimit = klimit;
 109
 110         romfs_base = (ram ? ram : (unsigned int)&__init_end);
 111         romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 112         if (!romfs_size) {
 113                 romfs_base = (unsigned int)&__bss_start;
 114                 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
 115         }
 116
 117         /* Move ROMFS out of BSS before clearing it */
 118         if (romfs_size > 0) {
 119                 memmove(&_ebss, (int *)romfs_base, romfs_size);
 120                 klimit += romfs_size;
 121         }
 122 #endif
 123
 124 /* clearing bss section */
 125         memset(__bss_start, 0, __bss_stop-__bss_start);
 126         memset(_ssbss, 0, _esbss-_ssbss);
 127
 128         /* Copy command line passed from bootloader */
 129 #ifndef CONFIG_CMDLINE_BOOL
 130         if (cmdline && cmdline[0] != '\0')
 131                 strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
 132 #endif
 133
 134         lockdep_init();
 135
 136 /* initialize device tree for usage in early_printk */
 137         early_init_devtree((void *)_fdt_start);
 138
 139 #ifdef CONFIG_EARLY_PRINTK
 140         setup_early_printk(NULL);
 141 #endif
 142
 143         early_printk("Ramdisk addr 0x%08x, ", ram);
 144         if (fdt)
 145                 early_printk("FDT at 0x%08x\n", fdt);
 146         else
 147                 early_printk("Compiled-in FDT at 0x%08x\n",
 148                                         (unsigned int)_fdt_start);
 149
 150 #ifdef CONFIG_MTD_UCLINUX
 151         early_printk("Found romfs @ 0x%08x (0x%08x)\n",
 152                         romfs_base, romfs_size);
 153         early_printk("#### klimit %p ####\n", old_klimit);
 154         BUG_ON(romfs_size < 0); /* What else can we do? */
 155
 156         early_printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
 157                         romfs_size, romfs_base, (unsigned)&_ebss);
 158
 159         early_printk("New klimit: 0x%08x\n", (unsigned)klimit);
 160 #endif
 161
 162 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
 163         if (msr)
 164                 early_printk("!!!Your kernel has setup MSR instruction but "
 165                                 "CPU don't have it %d\n", msr);
 166 #else
 167         if (!msr)
 168                 early_printk("!!!Your kernel not setup MSR instruction but "
 169                                 "CPU have it %d\n", msr);
 170 #endif
 171
 172         for (src = __ivt_start; src < __ivt_end; src++, dst++)
 173                 *dst = *src;
 174
 175         /* Initialize global data */
 176         per_cpu(KM, 0) = 0x1;   /* We start in kernel mode */
 177         per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
 178 }
 179
 180 #ifdef CONFIG_DEBUG_FS
 181 struct dentry *of_debugfs_root;
 182
 183 static int microblaze_debugfs_init(void)
 184 {
 185         of_debugfs_root = debugfs_create_dir("microblaze", NULL);
 186
 187         return of_debugfs_root == NULL;
 188 }
 189 arch_initcall(microblaze_debugfs_init);
 190 #endif