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 } 200