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>
22 #include <asm/processor.h>
23 #include <asm/pgtable.h>
24 #include <asm/setup.h>
27 #include <asm/cputable.h>
28 #include <asm/bootx.h>
29 #include <asm/btext.h>
30 #include <asm/machdep.h>
31 #include <asm/uaccess.h>
32 #include <asm/pmac_feature.h>
33 #include <asm/sections.h>
34 #include <asm/nvram.h>
37 #include <asm/serial.h>
39 #include <asm/code-patching.h>
40 #include <asm/cpu_has_feature.h>
44 extern void bootx_init(unsigned long r4, unsigned long phys);
47 EXPORT_SYMBOL_GPL(boot_cpuid_phys);
49 int smp_hw_index[NR_CPUS];
51 unsigned long ISA_DMA_THRESHOLD;
52 unsigned int DMA_MODE_READ;
53 unsigned int DMA_MODE_WRITE;
56 * These are used in binfmt_elf.c to put aux entries on the stack
57 * for each elf executable being started.
64 * We're called here very early in the boot.
66 * Note that the kernel may be running at an address which is different
67 * from the address that it was linked at, so we must use RELOC/PTRRELOC
68 * to access static data (including strings). -- paulus
70 notrace unsigned long __init early_init(unsigned long dt_ptr)
72 unsigned long offset = reloc_offset();
74 /* First zero the BSS -- use memset_io, some platforms don't have
76 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
77 __bss_stop - __bss_start);
80 * Identify the CPU type and fix up code sections
81 * that depend on which cpu we have.
83 identify_cpu(offset, mfspr(SPRN_PVR));
85 apply_feature_fixups();
87 return KERNELBASE + offset;
92 * This is run before start_kernel(), the kernel has been relocated
93 * and we are running with enough of the MMU enabled to have our
94 * proper kernel virtual addresses
96 * We do the initial parsing of the flat device-tree and prepares
97 * for the MMU to be fully initialized.
99 extern unsigned int memset_nocache_branch; /* Insn to be replaced by NOP */
101 notrace void __init machine_init(u64 dt_ptr)
103 /* Enable early debugging if any specified (see udbg.h) */
106 patch_instruction((unsigned int *)&memcpy, PPC_INST_NOP);
107 patch_instruction(&memset_nocache_branch, PPC_INST_NOP);
109 /* Do some early initialization based on the flat device tree */
110 early_init_devtree(__va(dt_ptr));
114 setup_kdump_trampoline();
117 /* Checks "l2cr=xxxx" command-line option */
118 int __init ppc_setup_l2cr(char *str)
120 if (cpu_has_feature(CPU_FTR_L2CR)) {
121 unsigned long val = simple_strtoul(str, NULL, 0);
122 printk(KERN_INFO "l2cr set to %lx\n", val);
123 _set_L2CR(0); /* force invalidate by disable cache */
124 _set_L2CR(val); /* and enable it */
128 __setup("l2cr=", ppc_setup_l2cr);
130 /* Checks "l3cr=xxxx" command-line option */
131 int __init ppc_setup_l3cr(char *str)
133 if (cpu_has_feature(CPU_FTR_L3CR)) {
134 unsigned long val = simple_strtoul(str, NULL, 0);
135 printk(KERN_INFO "l3cr set to %lx\n", val);
136 _set_L3CR(val); /* and enable it */
140 __setup("l3cr=", ppc_setup_l3cr);
142 #ifdef CONFIG_GENERIC_NVRAM
144 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
145 unsigned char nvram_read_byte(int addr)
147 if (ppc_md.nvram_read_val)
148 return ppc_md.nvram_read_val(addr);
151 EXPORT_SYMBOL(nvram_read_byte);
153 void nvram_write_byte(unsigned char val, int addr)
155 if (ppc_md.nvram_write_val)
156 ppc_md.nvram_write_val(addr, val);
158 EXPORT_SYMBOL(nvram_write_byte);
160 ssize_t nvram_get_size(void)
162 if (ppc_md.nvram_size)
163 return ppc_md.nvram_size();
166 EXPORT_SYMBOL(nvram_get_size);
168 void nvram_sync(void)
170 if (ppc_md.nvram_sync)
173 EXPORT_SYMBOL(nvram_sync);
175 #endif /* CONFIG_NVRAM */
177 int __init ppc_init(void)
179 /* clear the progress line */
181 ppc_md.progress(" ", 0xffff);
183 /* call platform init */
184 if (ppc_md.init != NULL) {
190 arch_initcall(ppc_init);
192 void __init irqstack_early_init(void)
196 /* interrupt stacks must be in lowmem, we get that for free on ppc32
197 * as the memblock is limited to lowmem by default */
198 for_each_possible_cpu(i) {
199 softirq_ctx[i] = (struct thread_info *)
200 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
201 hardirq_ctx[i] = (struct thread_info *)
202 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
206 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
207 void __init exc_lvl_early_init(void)
209 unsigned int i, hw_cpu;
211 /* interrupt stacks must be in lowmem, we get that for free on ppc32
212 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
213 for_each_possible_cpu(i) {
215 hw_cpu = get_hard_smp_processor_id(i);
220 critirq_ctx[hw_cpu] = (struct thread_info *)
221 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
223 dbgirq_ctx[hw_cpu] = (struct thread_info *)
224 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
225 mcheckirq_ctx[hw_cpu] = (struct thread_info *)
226 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
232 void __init setup_power_save(void)
235 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
236 cpu_has_feature(CPU_FTR_CAN_NAP))
237 ppc_md.power_save = ppc6xx_idle;
241 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
242 cpu_has_feature(CPU_FTR_CAN_NAP))
243 ppc_md.power_save = e500_idle;
247 __init void initialize_cache_info(void)
250 * Set cache line size based on type of cpu as a default.
251 * Systems with OF can look in the properties on the cpu node(s)
252 * for a possibly more accurate value.
254 dcache_bsize = cur_cpu_spec->dcache_bsize;
255 icache_bsize = cur_cpu_spec->icache_bsize;
257 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
258 ucache_bsize = icache_bsize = dcache_bsize;