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 #include "setup.h" 44 45 #define DBG(fmt...) 46 47 extern void bootx_init(unsigned long r4, unsigned long phys); 48 49 int boot_cpuid = -1; 50 EXPORT_SYMBOL_GPL(boot_cpuid); 51 int boot_cpuid_phys; 52 EXPORT_SYMBOL_GPL(boot_cpuid_phys); 53 54 int smp_hw_index[NR_CPUS]; 55 56 unsigned long ISA_DMA_THRESHOLD; 57 unsigned int DMA_MODE_READ; 58 unsigned int DMA_MODE_WRITE; 59 60 #ifdef CONFIG_VGA_CONSOLE 61 unsigned long vgacon_remap_base; 62 EXPORT_SYMBOL(vgacon_remap_base); 63 #endif 64 65 /* 66 * These are used in binfmt_elf.c to put aux entries on the stack 67 * for each elf executable being started. 68 */ 69 int dcache_bsize; 70 int icache_bsize; 71 int ucache_bsize; 72 73 /* 74 * We're called here very early in the boot. We determine the machine 75 * type and call the appropriate low-level setup functions. 76 * -- Cort <cort@fsmlabs.com> 77 * 78 * Note that the kernel may be running at an address which is different 79 * from the address that it was linked at, so we must use RELOC/PTRRELOC 80 * to access static data (including strings). -- paulus 81 */ 82 notrace unsigned long __init early_init(unsigned long dt_ptr) 83 { 84 unsigned long offset = reloc_offset(); 85 struct cpu_spec *spec; 86 87 /* First zero the BSS -- use memset_io, some platforms don't have 88 * caches on yet */ 89 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, 90 __bss_stop - __bss_start); 91 92 /* 93 * Identify the CPU type and fix up code sections 94 * that depend on which cpu we have. 95 */ 96 spec = identify_cpu(offset, mfspr(SPRN_PVR)); 97 98 do_feature_fixups(spec->cpu_features, 99 PTRRELOC(&__start___ftr_fixup), 100 PTRRELOC(&__stop___ftr_fixup)); 101 102 do_feature_fixups(spec->mmu_features, 103 PTRRELOC(&__start___mmu_ftr_fixup), 104 PTRRELOC(&__stop___mmu_ftr_fixup)); 105 106 do_lwsync_fixups(spec->cpu_features, 107 PTRRELOC(&__start___lwsync_fixup), 108 PTRRELOC(&__stop___lwsync_fixup)); 109 110 do_final_fixups(); 111 112 return KERNELBASE + offset; 113 } 114 115 116 /* 117 * Find out what kind of machine we're on and save any data we need 118 * from the early boot process (devtree is copied on pmac by prom_init()). 119 * This is called very early on the boot process, after a minimal 120 * MMU environment has been set up but before MMU_init is called. 121 */ 122 notrace void __init machine_init(u64 dt_ptr) 123 { 124 lockdep_init(); 125 126 /* Enable early debugging if any specified (see udbg.h) */ 127 udbg_early_init(); 128 129 /* Do some early initialization based on the flat device tree */ 130 early_init_devtree(__va(dt_ptr)); 131 132 epapr_paravirt_early_init(); 133 134 early_init_mmu(); 135 136 probe_machine(); 137 138 setup_kdump_trampoline(); 139 140 #ifdef CONFIG_6xx 141 if (cpu_has_feature(CPU_FTR_CAN_DOZE) || 142 cpu_has_feature(CPU_FTR_CAN_NAP)) 143 ppc_md.power_save = ppc6xx_idle; 144 #endif 145 146 #ifdef CONFIG_E500 147 if (cpu_has_feature(CPU_FTR_CAN_DOZE) || 148 cpu_has_feature(CPU_FTR_CAN_NAP)) 149 ppc_md.power_save = e500_idle; 150 #endif 151 if (ppc_md.progress) 152 ppc_md.progress("id mach(): done", 0x200); 153 } 154 155 /* Checks "l2cr=xxxx" command-line option */ 156 int __init ppc_setup_l2cr(char *str) 157 { 158 if (cpu_has_feature(CPU_FTR_L2CR)) { 159 unsigned long val = simple_strtoul(str, NULL, 0); 160 printk(KERN_INFO "l2cr set to %lx\n", val); 161 _set_L2CR(0); /* force invalidate by disable cache */ 162 _set_L2CR(val); /* and enable it */ 163 } 164 return 1; 165 } 166 __setup("l2cr=", ppc_setup_l2cr); 167 168 /* Checks "l3cr=xxxx" command-line option */ 169 int __init ppc_setup_l3cr(char *str) 170 { 171 if (cpu_has_feature(CPU_FTR_L3CR)) { 172 unsigned long val = simple_strtoul(str, NULL, 0); 173 printk(KERN_INFO "l3cr set to %lx\n", val); 174 _set_L3CR(val); /* and enable it */ 175 } 176 return 1; 177 } 178 __setup("l3cr=", ppc_setup_l3cr); 179 180 #ifdef CONFIG_GENERIC_NVRAM 181 182 /* Generic nvram hooks used by drivers/char/gen_nvram.c */ 183 unsigned char nvram_read_byte(int addr) 184 { 185 if (ppc_md.nvram_read_val) 186 return ppc_md.nvram_read_val(addr); 187 return 0xff; 188 } 189 EXPORT_SYMBOL(nvram_read_byte); 190 191 void nvram_write_byte(unsigned char val, int addr) 192 { 193 if (ppc_md.nvram_write_val) 194 ppc_md.nvram_write_val(addr, val); 195 } 196 EXPORT_SYMBOL(nvram_write_byte); 197 198 ssize_t nvram_get_size(void) 199 { 200 if (ppc_md.nvram_size) 201 return ppc_md.nvram_size(); 202 return -1; 203 } 204 EXPORT_SYMBOL(nvram_get_size); 205 206 void nvram_sync(void) 207 { 208 if (ppc_md.nvram_sync) 209 ppc_md.nvram_sync(); 210 } 211 EXPORT_SYMBOL(nvram_sync); 212 213 #endif /* CONFIG_NVRAM */ 214 215 int __init ppc_init(void) 216 { 217 /* clear the progress line */ 218 if (ppc_md.progress) 219 ppc_md.progress(" ", 0xffff); 220 221 /* call platform init */ 222 if (ppc_md.init != NULL) { 223 ppc_md.init(); 224 } 225 return 0; 226 } 227 228 arch_initcall(ppc_init); 229 230 static void __init irqstack_early_init(void) 231 { 232 unsigned int i; 233 234 /* interrupt stacks must be in lowmem, we get that for free on ppc32 235 * as the memblock is limited to lowmem by default */ 236 for_each_possible_cpu(i) { 237 softirq_ctx[i] = (struct thread_info *) 238 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 239 hardirq_ctx[i] = (struct thread_info *) 240 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 241 } 242 } 243 244 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x) 245 static void __init exc_lvl_early_init(void) 246 { 247 unsigned int i, hw_cpu; 248 249 /* interrupt stacks must be in lowmem, we get that for free on ppc32 250 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */ 251 for_each_possible_cpu(i) { 252 hw_cpu = get_hard_smp_processor_id(i); 253 critirq_ctx[hw_cpu] = (struct thread_info *) 254 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 255 #ifdef CONFIG_BOOKE 256 dbgirq_ctx[hw_cpu] = (struct thread_info *) 257 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 258 mcheckirq_ctx[hw_cpu] = (struct thread_info *) 259 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 260 #endif 261 } 262 } 263 #else 264 #define exc_lvl_early_init() 265 #endif 266 267 /* Warning, IO base is not yet inited */ 268 void __init setup_arch(char **cmdline_p) 269 { 270 *cmdline_p = cmd_line; 271 272 /* so udelay does something sensible, assume <= 1000 bogomips */ 273 loops_per_jiffy = 500000000 / HZ; 274 275 unflatten_device_tree(); 276 check_for_initrd(); 277 278 if (ppc_md.init_early) 279 ppc_md.init_early(); 280 281 find_legacy_serial_ports(); 282 283 smp_setup_cpu_maps(); 284 285 /* Register early console */ 286 register_early_udbg_console(); 287 288 xmon_setup(); 289 290 /* 291 * Set cache line size based on type of cpu as a default. 292 * Systems with OF can look in the properties on the cpu node(s) 293 * for a possibly more accurate value. 294 */ 295 dcache_bsize = cur_cpu_spec->dcache_bsize; 296 icache_bsize = cur_cpu_spec->icache_bsize; 297 ucache_bsize = 0; 298 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE)) 299 ucache_bsize = icache_bsize = dcache_bsize; 300 301 /* reboot on panic */ 302 panic_timeout = 180; 303 304 if (ppc_md.panic) 305 setup_panic(); 306 307 init_mm.start_code = (unsigned long)_stext; 308 init_mm.end_code = (unsigned long) _etext; 309 init_mm.end_data = (unsigned long) _edata; 310 init_mm.brk = klimit; 311 312 exc_lvl_early_init(); 313 314 irqstack_early_init(); 315 316 /* set up the bootmem stuff with available memory */ 317 do_init_bootmem(); 318 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab); 319 320 #ifdef CONFIG_DUMMY_CONSOLE 321 conswitchp = &dummy_con; 322 #endif 323 324 if (ppc_md.setup_arch) 325 ppc_md.setup_arch(); 326 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab); 327 328 paging_init(); 329 330 /* Initialize the MMU context management stuff */ 331 mmu_context_init(); 332 } 333