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 191