1 /* 2 * Common prep/pmac/chrp boot and setup code. 3 */ 4 5 #include <linux/module.h> 6 #include <linux/string.h> 7 #include <linux/sched.h> 8 #include <linux/init.h> 9 #include <linux/kernel.h> 10 #include <linux/reboot.h> 11 #include <linux/delay.h> 12 #include <linux/initrd.h> 13 #include <linux/tty.h> 14 #include <linux/bootmem.h> 15 #include <linux/seq_file.h> 16 #include <linux/root_dev.h> 17 #include <linux/cpu.h> 18 #include <linux/console.h> 19 #include <linux/memblock.h> 20 21 #include <asm/io.h> 22 #include <asm/prom.h> 23 #include <asm/processor.h> 24 #include <asm/pgtable.h> 25 #include <asm/setup.h> 26 #include <asm/smp.h> 27 #include <asm/elf.h> 28 #include <asm/cputable.h> 29 #include <asm/bootx.h> 30 #include <asm/btext.h> 31 #include <asm/machdep.h> 32 #include <asm/uaccess.h> 33 #include <asm/pmac_feature.h> 34 #include <asm/sections.h> 35 #include <asm/nvram.h> 36 #include <asm/xmon.h> 37 #include <asm/time.h> 38 #include <asm/serial.h> 39 #include <asm/udbg.h> 40 #include <asm/mmu_context.h> 41 42 #include "setup.h" 43 44 #define DBG(fmt...) 45 46 extern void bootx_init(unsigned long r4, unsigned long phys); 47 48 int boot_cpuid = -1; 49 EXPORT_SYMBOL_GPL(boot_cpuid); 50 int boot_cpuid_phys; 51 EXPORT_SYMBOL_GPL(boot_cpuid_phys); 52 53 int smp_hw_index[NR_CPUS]; 54 55 unsigned long ISA_DMA_THRESHOLD; 56 unsigned int DMA_MODE_READ; 57 unsigned int DMA_MODE_WRITE; 58 59 #ifdef CONFIG_VGA_CONSOLE 60 unsigned long vgacon_remap_base; 61 EXPORT_SYMBOL(vgacon_remap_base); 62 #endif 63 64 /* 65 * These are used in binfmt_elf.c to put aux entries on the stack 66 * for each elf executable being started. 67 */ 68 int dcache_bsize; 69 int icache_bsize; 70 int ucache_bsize; 71 72 /* 73 * We're called here very early in the boot. We determine the machine 74 * type and call the appropriate low-level setup functions. 75 * -- Cort <cort@fsmlabs.com> 76 * 77 * Note that the kernel may be running at an address which is different 78 * from the address that it was linked at, so we must use RELOC/PTRRELOC 79 * to access static data (including strings). -- paulus 80 */ 81 notrace unsigned long __init early_init(unsigned long dt_ptr) 82 { 83 unsigned long offset = reloc_offset(); 84 struct cpu_spec *spec; 85 86 /* First zero the BSS -- use memset_io, some platforms don't have 87 * caches on yet */ 88 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, 89 __bss_stop - __bss_start); 90 91 /* 92 * Identify the CPU type and fix up code sections 93 * that depend on which cpu we have. 94 */ 95 spec = identify_cpu(offset, mfspr(SPRN_PVR)); 96 97 do_feature_fixups(spec->cpu_features, 98 PTRRELOC(&__start___ftr_fixup), 99 PTRRELOC(&__stop___ftr_fixup)); 100 101 do_feature_fixups(spec->mmu_features, 102 PTRRELOC(&__start___mmu_ftr_fixup), 103 PTRRELOC(&__stop___mmu_ftr_fixup)); 104 105 do_lwsync_fixups(spec->cpu_features, 106 PTRRELOC(&__start___lwsync_fixup), 107 PTRRELOC(&__stop___lwsync_fixup)); 108 109 do_final_fixups(); 110 111 return KERNELBASE + offset; 112 } 113 114 115 /* 116 * Find out what kind of machine we're on and save any data we need 117 * from the early boot process (devtree is copied on pmac by prom_init()). 118 * This is called very early on the boot process, after a minimal 119 * MMU environment has been set up but before MMU_init is called. 120 */ 121 notrace void __init machine_init(u64 dt_ptr) 122 { 123 lockdep_init(); 124 125 /* Enable early debugging if any specified (see udbg.h) */ 126 udbg_early_init(); 127 128 /* Do some early initialization based on the flat device tree */ 129 early_init_devtree(__va(dt_ptr)); 130 131 early_init_mmu(); 132 133 probe_machine(); 134 135 setup_kdump_trampoline(); 136 137 #ifdef CONFIG_6xx 138 if (cpu_has_feature(CPU_FTR_CAN_DOZE) || 139 cpu_has_feature(CPU_FTR_CAN_NAP)) 140 ppc_md.power_save = ppc6xx_idle; 141 #endif 142 143 #ifdef CONFIG_E500 144 if (cpu_has_feature(CPU_FTR_CAN_DOZE) || 145 cpu_has_feature(CPU_FTR_CAN_NAP)) 146 ppc_md.power_save = e500_idle; 147 #endif 148 if (ppc_md.progress) 149 ppc_md.progress("id mach(): done", 0x200); 150 } 151 152 /* Checks "l2cr=xxxx" command-line option */ 153 int __init ppc_setup_l2cr(char *str) 154 { 155 if (cpu_has_feature(CPU_FTR_L2CR)) { 156 unsigned long val = simple_strtoul(str, NULL, 0); 157 printk(KERN_INFO "l2cr set to %lx\n", val); 158 _set_L2CR(0); /* force invalidate by disable cache */ 159 _set_L2CR(val); /* and enable it */ 160 } 161 return 1; 162 } 163 __setup("l2cr=", ppc_setup_l2cr); 164 165 /* Checks "l3cr=xxxx" command-line option */ 166 int __init ppc_setup_l3cr(char *str) 167 { 168 if (cpu_has_feature(CPU_FTR_L3CR)) { 169 unsigned long val = simple_strtoul(str, NULL, 0); 170 printk(KERN_INFO "l3cr set to %lx\n", val); 171 _set_L3CR(val); /* and enable it */ 172 } 173 return 1; 174 } 175 __setup("l3cr=", ppc_setup_l3cr); 176 177 #ifdef CONFIG_GENERIC_NVRAM 178 179 /* Generic nvram hooks used by drivers/char/gen_nvram.c */ 180 unsigned char nvram_read_byte(int addr) 181 { 182 if (ppc_md.nvram_read_val) 183 return ppc_md.nvram_read_val(addr); 184 return 0xff; 185 } 186 EXPORT_SYMBOL(nvram_read_byte); 187 188 void nvram_write_byte(unsigned char val, int addr) 189 { 190 if (ppc_md.nvram_write_val) 191 ppc_md.nvram_write_val(addr, val); 192 } 193 EXPORT_SYMBOL(nvram_write_byte); 194 195 ssize_t nvram_get_size(void) 196 { 197 if (ppc_md.nvram_size) 198 return ppc_md.nvram_size(); 199 return -1; 200 } 201 EXPORT_SYMBOL(nvram_get_size); 202 203 void nvram_sync(void) 204 { 205 if (ppc_md.nvram_sync) 206 ppc_md.nvram_sync(); 207 } 208 EXPORT_SYMBOL(nvram_sync); 209 210 #endif /* CONFIG_NVRAM */ 211 212 int __init ppc_init(void) 213 { 214 /* clear the progress line */ 215 if (ppc_md.progress) 216 ppc_md.progress(" ", 0xffff); 217 218 /* call platform init */ 219 if (ppc_md.init != NULL) { 220 ppc_md.init(); 221 } 222 return 0; 223 } 224 225 arch_initcall(ppc_init); 226 227 static void __init irqstack_early_init(void) 228 { 229 unsigned int i; 230 231 /* interrupt stacks must be in lowmem, we get that for free on ppc32 232 * as the memblock is limited to lowmem by default */ 233 for_each_possible_cpu(i) { 234 softirq_ctx[i] = (struct thread_info *) 235 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 236 hardirq_ctx[i] = (struct thread_info *) 237 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 238 } 239 } 240 241 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x) 242 static void __init exc_lvl_early_init(void) 243 { 244 unsigned int i, hw_cpu; 245 246 /* interrupt stacks must be in lowmem, we get that for free on ppc32 247 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */ 248 for_each_possible_cpu(i) { 249 hw_cpu = get_hard_smp_processor_id(i); 250 critirq_ctx[hw_cpu] = (struct thread_info *) 251 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 252 #ifdef CONFIG_BOOKE 253 dbgirq_ctx[hw_cpu] = (struct thread_info *) 254 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 255 mcheckirq_ctx[hw_cpu] = (struct thread_info *) 256 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 257 #endif 258 } 259 } 260 #else 261 #define exc_lvl_early_init() 262 #endif 263 264 /* Warning, IO base is not yet inited */ 265 void __init setup_arch(char **cmdline_p) 266 { 267 *cmdline_p = cmd_line; 268 269 /* so udelay does something sensible, assume <= 1000 bogomips */ 270 loops_per_jiffy = 500000000 / HZ; 271 272 unflatten_device_tree(); 273 check_for_initrd(); 274 275 if (ppc_md.init_early) 276 ppc_md.init_early(); 277 278 find_legacy_serial_ports(); 279 280 smp_setup_cpu_maps(); 281 282 /* Register early console */ 283 register_early_udbg_console(); 284 285 xmon_setup(); 286 287 /* 288 * Set cache line size based on type of cpu as a default. 289 * Systems with OF can look in the properties on the cpu node(s) 290 * for a possibly more accurate value. 291 */ 292 dcache_bsize = cur_cpu_spec->dcache_bsize; 293 icache_bsize = cur_cpu_spec->icache_bsize; 294 ucache_bsize = 0; 295 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE)) 296 ucache_bsize = icache_bsize = dcache_bsize; 297 298 /* reboot on panic */ 299 panic_timeout = 180; 300 301 if (ppc_md.panic) 302 setup_panic(); 303 304 init_mm.start_code = (unsigned long)_stext; 305 init_mm.end_code = (unsigned long) _etext; 306 init_mm.end_data = (unsigned long) _edata; 307 init_mm.brk = klimit; 308 309 exc_lvl_early_init(); 310 311 irqstack_early_init(); 312 313 /* set up the bootmem stuff with available memory */ 314 do_init_bootmem(); 315 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab); 316 317 #ifdef CONFIG_DUMMY_CONSOLE 318 conswitchp = &dummy_con; 319 #endif 320 321 if (ppc_md.setup_arch) 322 ppc_md.setup_arch(); 323 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab); 324 325 paging_init(); 326 327 /* Initialize the MMU context management stuff */ 328 mmu_context_init(); 329 330 } 331