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