2 * Common prep/pmac/chrp boot and setup code.
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>
23 #include <asm/processor.h>
24 #include <asm/pgtable.h>
25 #include <asm/setup.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>
38 #include <asm/serial.h>
40 #include <asm/code-patching.h>
41 #include <asm/cpu_has_feature.h>
42 #include <asm/asm-prototypes.h>
46 extern void bootx_init(unsigned long r4, unsigned long phys);
49 EXPORT_SYMBOL_GPL(boot_cpuid_phys);
51 int smp_hw_index[NR_CPUS];
52 EXPORT_SYMBOL(smp_hw_index);
54 unsigned long ISA_DMA_THRESHOLD;
55 unsigned int DMA_MODE_READ;
56 unsigned int DMA_MODE_WRITE;
58 EXPORT_SYMBOL(ISA_DMA_THRESHOLD);
59 EXPORT_SYMBOL(DMA_MODE_READ);
60 EXPORT_SYMBOL(DMA_MODE_WRITE);
63 * We're called here very early in the boot.
65 * Note that the kernel may be running at an address which is different
66 * from the address that it was linked at, so we must use RELOC/PTRRELOC
67 * to access static data (including strings). -- paulus
69 notrace unsigned long __init early_init(unsigned long dt_ptr)
71 unsigned long offset = reloc_offset();
73 /* First zero the BSS -- use memset_io, some platforms don't have
75 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
76 __bss_stop - __bss_start);
79 * Identify the CPU type and fix up code sections
80 * that depend on which cpu we have.
82 identify_cpu(offset, mfspr(SPRN_PVR));
84 apply_feature_fixups();
86 return KERNELBASE + offset;
91 * This is run before start_kernel(), the kernel has been relocated
92 * and we are running with enough of the MMU enabled to have our
93 * proper kernel virtual addresses
95 * We do the initial parsing of the flat device-tree and prepares
96 * for the MMU to be fully initialized.
98 extern unsigned int memset_nocache_branch; /* Insn to be replaced by NOP */
100 notrace void __init machine_init(u64 dt_ptr)
102 unsigned int *addr = &memset_nocache_branch;
105 /* Configure static keys first, now that we're relocated. */
106 setup_feature_keys();
108 /* Enable early debugging if any specified (see udbg.h) */
111 patch_instruction((unsigned int *)&memcpy, PPC_INST_NOP);
113 insn = create_cond_branch(addr, branch_target(addr), 0x820000);
114 patch_instruction(addr, insn); /* replace b by bne cr0 */
116 /* Do some early initialization based on the flat device tree */
117 early_init_devtree(__va(dt_ptr));
121 setup_kdump_trampoline();
124 /* Checks "l2cr=xxxx" command-line option */
125 static int __init ppc_setup_l2cr(char *str)
127 if (cpu_has_feature(CPU_FTR_L2CR)) {
128 unsigned long val = simple_strtoul(str, NULL, 0);
129 printk(KERN_INFO "l2cr set to %lx\n", val);
130 _set_L2CR(0); /* force invalidate by disable cache */
131 _set_L2CR(val); /* and enable it */
135 __setup("l2cr=", ppc_setup_l2cr);
137 /* Checks "l3cr=xxxx" command-line option */
138 static int __init ppc_setup_l3cr(char *str)
140 if (cpu_has_feature(CPU_FTR_L3CR)) {
141 unsigned long val = simple_strtoul(str, NULL, 0);
142 printk(KERN_INFO "l3cr set to %lx\n", val);
143 _set_L3CR(val); /* and enable it */
147 __setup("l3cr=", ppc_setup_l3cr);
149 #ifdef CONFIG_GENERIC_NVRAM
151 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
152 unsigned char nvram_read_byte(int addr)
154 if (ppc_md.nvram_read_val)
155 return ppc_md.nvram_read_val(addr);
158 EXPORT_SYMBOL(nvram_read_byte);
160 void nvram_write_byte(unsigned char val, int addr)
162 if (ppc_md.nvram_write_val)
163 ppc_md.nvram_write_val(addr, val);
165 EXPORT_SYMBOL(nvram_write_byte);
167 ssize_t nvram_get_size(void)
169 if (ppc_md.nvram_size)
170 return ppc_md.nvram_size();
173 EXPORT_SYMBOL(nvram_get_size);
175 void nvram_sync(void)
177 if (ppc_md.nvram_sync)
180 EXPORT_SYMBOL(nvram_sync);
182 #endif /* CONFIG_NVRAM */
184 static int __init ppc_init(void)
186 /* clear the progress line */
188 ppc_md.progress(" ", 0xffff);
190 /* call platform init */
191 if (ppc_md.init != NULL) {
196 arch_initcall(ppc_init);
198 void __init irqstack_early_init(void)
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));
212 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
213 void __init exc_lvl_early_init(void)
215 unsigned int i, hw_cpu;
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) {
221 hw_cpu = get_hard_smp_processor_id(i);
226 critirq_ctx[hw_cpu] = (struct thread_info *)
227 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
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));
238 void __init setup_power_save(void)
241 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
242 cpu_has_feature(CPU_FTR_CAN_NAP))
243 ppc_md.power_save = ppc6xx_idle;
247 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
248 cpu_has_feature(CPU_FTR_CAN_NAP))
249 ppc_md.power_save = e500_idle;
253 __init void initialize_cache_info(void)
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.
260 dcache_bsize = cur_cpu_spec->dcache_bsize;
261 icache_bsize = cur_cpu_spec->icache_bsize;
263 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
264 ucache_bsize = icache_bsize = dcache_bsize;