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