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>
43 #include <asm/kdump.h>
44 #include <asm/feature-fixups.h>
50 extern void bootx_init(unsigned long r4, unsigned long phys);
53 EXPORT_SYMBOL_GPL(boot_cpuid_phys);
55 int smp_hw_index[NR_CPUS];
56 EXPORT_SYMBOL(smp_hw_index);
58 unsigned long ISA_DMA_THRESHOLD;
59 unsigned int DMA_MODE_READ;
60 unsigned int DMA_MODE_WRITE;
62 EXPORT_SYMBOL(ISA_DMA_THRESHOLD);
63 EXPORT_SYMBOL(DMA_MODE_READ);
64 EXPORT_SYMBOL(DMA_MODE_WRITE);
67 * We're called here very early in the boot.
69 * Note that the kernel may be running at an address which is different
70 * from the address that it was linked at, so we must use RELOC/PTRRELOC
71 * to access static data (including strings). -- paulus
73 notrace unsigned long __init early_init(unsigned long dt_ptr)
75 unsigned long offset = reloc_offset();
77 /* First zero the BSS -- use memset_io, some platforms don't have
79 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
80 __bss_stop - __bss_start);
83 * Identify the CPU type and fix up code sections
84 * that depend on which cpu we have.
86 identify_cpu(offset, mfspr(SPRN_PVR));
88 apply_feature_fixups();
90 return KERNELBASE + offset;
95 * This is run before start_kernel(), the kernel has been relocated
96 * and we are running with enough of the MMU enabled to have our
97 * proper kernel virtual addresses
99 * We do the initial parsing of the flat device-tree and prepares
100 * for the MMU to be fully initialized.
102 notrace void __init machine_init(u64 dt_ptr)
104 unsigned int *addr = (unsigned int *)((unsigned long)&patch__memset_nocache +
105 patch__memset_nocache);
108 /* Configure static keys first, now that we're relocated. */
109 setup_feature_keys();
111 /* Enable early debugging if any specified (see udbg.h) */
114 patch_instruction_site(&patch__memcpy_nocache, PPC_INST_NOP);
116 insn = create_cond_branch(addr, branch_target(addr), 0x820000);
117 patch_instruction(addr, insn); /* replace b by bne cr0 */
119 /* Do some early initialization based on the flat device tree */
120 early_init_devtree(__va(dt_ptr));
124 setup_kdump_trampoline();
127 /* Checks "l2cr=xxxx" command-line option */
128 static int __init ppc_setup_l2cr(char *str)
130 if (cpu_has_feature(CPU_FTR_L2CR)) {
131 unsigned long val = simple_strtoul(str, NULL, 0);
132 printk(KERN_INFO "l2cr set to %lx\n", val);
133 _set_L2CR(0); /* force invalidate by disable cache */
134 _set_L2CR(val); /* and enable it */
138 __setup("l2cr=", ppc_setup_l2cr);
140 /* Checks "l3cr=xxxx" command-line option */
141 static int __init ppc_setup_l3cr(char *str)
143 if (cpu_has_feature(CPU_FTR_L3CR)) {
144 unsigned long val = simple_strtoul(str, NULL, 0);
145 printk(KERN_INFO "l3cr set to %lx\n", val);
146 _set_L3CR(val); /* and enable it */
150 __setup("l3cr=", ppc_setup_l3cr);
152 #ifdef CONFIG_GENERIC_NVRAM
154 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
155 unsigned char nvram_read_byte(int addr)
157 if (ppc_md.nvram_read_val)
158 return ppc_md.nvram_read_val(addr);
161 EXPORT_SYMBOL(nvram_read_byte);
163 void nvram_write_byte(unsigned char val, int addr)
165 if (ppc_md.nvram_write_val)
166 ppc_md.nvram_write_val(addr, val);
168 EXPORT_SYMBOL(nvram_write_byte);
170 ssize_t nvram_get_size(void)
172 if (ppc_md.nvram_size)
173 return ppc_md.nvram_size();
176 EXPORT_SYMBOL(nvram_get_size);
178 void nvram_sync(void)
180 if (ppc_md.nvram_sync)
183 EXPORT_SYMBOL(nvram_sync);
185 #endif /* CONFIG_NVRAM */
187 static int __init ppc_init(void)
189 /* clear the progress line */
191 ppc_md.progress(" ", 0xffff);
193 /* call platform init */
194 if (ppc_md.init != NULL) {
199 arch_initcall(ppc_init);
201 void __init irqstack_early_init(void)
205 /* interrupt stacks must be in lowmem, we get that for free on ppc32
206 * as the memblock is limited to lowmem by default */
207 for_each_possible_cpu(i) {
208 softirq_ctx[i] = (struct thread_info *)
209 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
210 hardirq_ctx[i] = (struct thread_info *)
211 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
215 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
216 void __init exc_lvl_early_init(void)
218 unsigned int i, hw_cpu;
220 /* interrupt stacks must be in lowmem, we get that for free on ppc32
221 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
222 for_each_possible_cpu(i) {
224 hw_cpu = get_hard_smp_processor_id(i);
229 critirq_ctx[hw_cpu] = (struct thread_info *)
230 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
232 dbgirq_ctx[hw_cpu] = (struct thread_info *)
233 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
234 mcheckirq_ctx[hw_cpu] = (struct thread_info *)
235 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
241 void __init setup_power_save(void)
244 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
245 cpu_has_feature(CPU_FTR_CAN_NAP))
246 ppc_md.power_save = ppc6xx_idle;
250 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
251 cpu_has_feature(CPU_FTR_CAN_NAP))
252 ppc_md.power_save = e500_idle;
256 __init void initialize_cache_info(void)
259 * Set cache line size based on type of cpu as a default.
260 * Systems with OF can look in the properties on the cpu node(s)
261 * for a possibly more accurate value.
263 dcache_bsize = cur_cpu_spec->dcache_bsize;
264 icache_bsize = cur_cpu_spec->icache_bsize;
266 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
267 ucache_bsize = icache_bsize = dcache_bsize;