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/seq_file.h> 15 #include <linux/root_dev.h> 16 #include <linux/cpu.h> 17 #include <linux/console.h> 18 #include <linux/memblock.h> 19 #include <linux/export.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 <linux/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/code-patching.h> 41 #include <asm/cpu_has_feature.h> 42 43 #define DBG(fmt...) 44 45 extern void bootx_init(unsigned long r4, unsigned long phys); 46 47 int boot_cpuid_phys; 48 EXPORT_SYMBOL_GPL(boot_cpuid_phys); 49 50 int smp_hw_index[NR_CPUS]; 51 EXPORT_SYMBOL(smp_hw_index); 52 53 unsigned long ISA_DMA_THRESHOLD; 54 unsigned int DMA_MODE_READ; 55 unsigned int DMA_MODE_WRITE; 56 57 EXPORT_SYMBOL(ISA_DMA_THRESHOLD); 58 EXPORT_SYMBOL(DMA_MODE_READ); 59 EXPORT_SYMBOL(DMA_MODE_WRITE); 60 61 /* 62 * We're called here very early in the boot. 63 * 64 * Note that the kernel may be running at an address which is different 65 * from the address that it was linked at, so we must use RELOC/PTRRELOC 66 * to access static data (including strings). -- paulus 67 */ 68 notrace unsigned long __init early_init(unsigned long dt_ptr) 69 { 70 unsigned long offset = reloc_offset(); 71 72 /* First zero the BSS -- use memset_io, some platforms don't have 73 * caches on yet */ 74 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, 75 __bss_stop - __bss_start); 76 77 /* 78 * Identify the CPU type and fix up code sections 79 * that depend on which cpu we have. 80 */ 81 identify_cpu(offset, mfspr(SPRN_PVR)); 82 83 apply_feature_fixups(); 84 85 return KERNELBASE + offset; 86 } 87 88 89 /* 90 * This is run before start_kernel(), the kernel has been relocated 91 * and we are running with enough of the MMU enabled to have our 92 * proper kernel virtual addresses 93 * 94 * We do the initial parsing of the flat device-tree and prepares 95 * for the MMU to be fully initialized. 96 */ 97 extern unsigned int memset_nocache_branch; /* Insn to be replaced by NOP */ 98 99 notrace void __init machine_init(u64 dt_ptr) 100 { 101 unsigned int *addr = &memset_nocache_branch; 102 unsigned long insn; 103 104 /* Configure static keys first, now that we're relocated. */ 105 setup_feature_keys(); 106 107 /* Enable early debugging if any specified (see udbg.h) */ 108 udbg_early_init(); 109 110 patch_instruction((unsigned int *)&memcpy, PPC_INST_NOP); 111 112 insn = create_cond_branch(addr, branch_target(addr), 0x820000); 113 patch_instruction(addr, insn); /* replace b by bne cr0 */ 114 115 /* Do some early initialization based on the flat device tree */ 116 early_init_devtree(__va(dt_ptr)); 117 118 early_init_mmu(); 119 120 setup_kdump_trampoline(); 121 } 122 123 /* Checks "l2cr=xxxx" command-line option */ 124 int __init ppc_setup_l2cr(char *str) 125 { 126 if (cpu_has_feature(CPU_FTR_L2CR)) { 127 unsigned long val = simple_strtoul(str, NULL, 0); 128 printk(KERN_INFO "l2cr set to %lx\n", val); 129 _set_L2CR(0); /* force invalidate by disable cache */ 130 _set_L2CR(val); /* and enable it */ 131 } 132 return 1; 133 } 134 __setup("l2cr=", ppc_setup_l2cr); 135 136 /* Checks "l3cr=xxxx" command-line option */ 137 int __init ppc_setup_l3cr(char *str) 138 { 139 if (cpu_has_feature(CPU_FTR_L3CR)) { 140 unsigned long val = simple_strtoul(str, NULL, 0); 141 printk(KERN_INFO "l3cr set to %lx\n", val); 142 _set_L3CR(val); /* and enable it */ 143 } 144 return 1; 145 } 146 __setup("l3cr=", ppc_setup_l3cr); 147 148 #ifdef CONFIG_GENERIC_NVRAM 149 150 /* Generic nvram hooks used by drivers/char/gen_nvram.c */ 151 unsigned char nvram_read_byte(int addr) 152 { 153 if (ppc_md.nvram_read_val) 154 return ppc_md.nvram_read_val(addr); 155 return 0xff; 156 } 157 EXPORT_SYMBOL(nvram_read_byte); 158 159 void nvram_write_byte(unsigned char val, int addr) 160 { 161 if (ppc_md.nvram_write_val) 162 ppc_md.nvram_write_val(addr, val); 163 } 164 EXPORT_SYMBOL(nvram_write_byte); 165 166 ssize_t nvram_get_size(void) 167 { 168 if (ppc_md.nvram_size) 169 return ppc_md.nvram_size(); 170 return -1; 171 } 172 EXPORT_SYMBOL(nvram_get_size); 173 174 void nvram_sync(void) 175 { 176 if (ppc_md.nvram_sync) 177 ppc_md.nvram_sync(); 178 } 179 EXPORT_SYMBOL(nvram_sync); 180 181 #endif /* CONFIG_NVRAM */ 182 183 int __init ppc_init(void) 184 { 185 /* clear the progress line */ 186 if (ppc_md.progress) 187 ppc_md.progress(" ", 0xffff); 188 189 /* call platform init */ 190 if (ppc_md.init != NULL) { 191 ppc_md.init(); 192 } 193 return 0; 194 } 195 196 arch_initcall(ppc_init); 197 198 void __init irqstack_early_init(void) 199 { 200 unsigned int i; 201 202 /* interrupt stacks must be in lowmem, we get that for free on ppc32 203 * as the memblock is limited to lowmem by default */ 204 for_each_possible_cpu(i) { 205 softirq_ctx[i] = (struct thread_info *) 206 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 207 hardirq_ctx[i] = (struct thread_info *) 208 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 209 } 210 } 211 212 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x) 213 void __init exc_lvl_early_init(void) 214 { 215 unsigned int i, hw_cpu; 216 217 /* interrupt stacks must be in lowmem, we get that for free on ppc32 218 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */ 219 for_each_possible_cpu(i) { 220 #ifdef CONFIG_SMP 221 hw_cpu = get_hard_smp_processor_id(i); 222 #else 223 hw_cpu = 0; 224 #endif 225 226 critirq_ctx[hw_cpu] = (struct thread_info *) 227 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 228 #ifdef CONFIG_BOOKE 229 dbgirq_ctx[hw_cpu] = (struct thread_info *) 230 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 231 mcheckirq_ctx[hw_cpu] = (struct thread_info *) 232 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 233 #endif 234 } 235 } 236 #endif 237 238 void __init setup_power_save(void) 239 { 240 #ifdef CONFIG_6xx 241 if (cpu_has_feature(CPU_FTR_CAN_DOZE) || 242 cpu_has_feature(CPU_FTR_CAN_NAP)) 243 ppc_md.power_save = ppc6xx_idle; 244 #endif 245 246 #ifdef CONFIG_E500 247 if (cpu_has_feature(CPU_FTR_CAN_DOZE) || 248 cpu_has_feature(CPU_FTR_CAN_NAP)) 249 ppc_md.power_save = e500_idle; 250 #endif 251 } 252 253 __init void initialize_cache_info(void) 254 { 255 /* 256 * Set cache line size based on type of cpu as a default. 257 * Systems with OF can look in the properties on the cpu node(s) 258 * for a possibly more accurate value. 259 */ 260 dcache_bsize = cur_cpu_spec->dcache_bsize; 261 icache_bsize = cur_cpu_spec->icache_bsize; 262 ucache_bsize = 0; 263 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE)) 264 ucache_bsize = icache_bsize = dcache_bsize; 265 } 266