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/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>
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 <asm/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/mmu_context.h>
46 extern void bootx_init(unsigned long r4, unsigned long phys);
49 EXPORT_SYMBOL_GPL(boot_cpuid);
51 EXPORT_SYMBOL_GPL(boot_cpuid_phys);
53 int smp_hw_index[NR_CPUS];
55 unsigned long ISA_DMA_THRESHOLD;
56 unsigned int DMA_MODE_READ;
57 unsigned int DMA_MODE_WRITE;
59 #ifdef CONFIG_VGA_CONSOLE
60 unsigned long vgacon_remap_base;
61 EXPORT_SYMBOL(vgacon_remap_base);
65 * These are used in binfmt_elf.c to put aux entries on the stack
66 * for each elf executable being started.
73 * We're called here very early in the boot. We determine the machine
74 * type and call the appropriate low-level setup functions.
75 * -- Cort <cort@fsmlabs.com>
77 * Note that the kernel may be running at an address which is different
78 * from the address that it was linked at, so we must use RELOC/PTRRELOC
79 * to access static data (including strings). -- paulus
81 notrace unsigned long __init early_init(unsigned long dt_ptr)
83 unsigned long offset = reloc_offset();
84 struct cpu_spec *spec;
86 /* First zero the BSS -- use memset_io, some platforms don't have
88 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
89 __bss_stop - __bss_start);
92 * Identify the CPU type and fix up code sections
93 * that depend on which cpu we have.
95 spec = identify_cpu(offset, mfspr(SPRN_PVR));
97 do_feature_fixups(spec->cpu_features,
98 PTRRELOC(&__start___ftr_fixup),
99 PTRRELOC(&__stop___ftr_fixup));
101 do_feature_fixups(spec->mmu_features,
102 PTRRELOC(&__start___mmu_ftr_fixup),
103 PTRRELOC(&__stop___mmu_ftr_fixup));
105 do_lwsync_fixups(spec->cpu_features,
106 PTRRELOC(&__start___lwsync_fixup),
107 PTRRELOC(&__stop___lwsync_fixup));
111 return KERNELBASE + offset;
116 * Find out what kind of machine we're on and save any data we need
117 * from the early boot process (devtree is copied on pmac by prom_init()).
118 * This is called very early on the boot process, after a minimal
119 * MMU environment has been set up but before MMU_init is called.
121 notrace void __init machine_init(u64 dt_ptr)
125 /* Enable early debugging if any specified (see udbg.h) */
128 /* Do some early initialization based on the flat device tree */
129 early_init_devtree(__va(dt_ptr));
135 setup_kdump_trampoline();
138 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
139 cpu_has_feature(CPU_FTR_CAN_NAP))
140 ppc_md.power_save = ppc6xx_idle;
144 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
145 cpu_has_feature(CPU_FTR_CAN_NAP))
146 ppc_md.power_save = e500_idle;
149 ppc_md.progress("id mach(): done", 0x200);
152 #ifdef CONFIG_BOOKE_WDT
153 /* Checks wdt=x and wdt_period=xx command-line option */
154 notrace int __init early_parse_wdt(char *p)
156 if (p && strncmp(p, "0", 1) != 0)
157 booke_wdt_enabled = 1;
161 early_param("wdt", early_parse_wdt);
163 int __init early_parse_wdt_period (char *p)
166 booke_wdt_period = simple_strtoul(p, NULL, 0);
170 early_param("wdt_period", early_parse_wdt_period);
171 #endif /* CONFIG_BOOKE_WDT */
173 /* Checks "l2cr=xxxx" command-line option */
174 int __init ppc_setup_l2cr(char *str)
176 if (cpu_has_feature(CPU_FTR_L2CR)) {
177 unsigned long val = simple_strtoul(str, NULL, 0);
178 printk(KERN_INFO "l2cr set to %lx\n", val);
179 _set_L2CR(0); /* force invalidate by disable cache */
180 _set_L2CR(val); /* and enable it */
184 __setup("l2cr=", ppc_setup_l2cr);
186 /* Checks "l3cr=xxxx" command-line option */
187 int __init ppc_setup_l3cr(char *str)
189 if (cpu_has_feature(CPU_FTR_L3CR)) {
190 unsigned long val = simple_strtoul(str, NULL, 0);
191 printk(KERN_INFO "l3cr set to %lx\n", val);
192 _set_L3CR(val); /* and enable it */
196 __setup("l3cr=", ppc_setup_l3cr);
198 #ifdef CONFIG_GENERIC_NVRAM
200 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
201 unsigned char nvram_read_byte(int addr)
203 if (ppc_md.nvram_read_val)
204 return ppc_md.nvram_read_val(addr);
207 EXPORT_SYMBOL(nvram_read_byte);
209 void nvram_write_byte(unsigned char val, int addr)
211 if (ppc_md.nvram_write_val)
212 ppc_md.nvram_write_val(addr, val);
214 EXPORT_SYMBOL(nvram_write_byte);
216 ssize_t nvram_get_size(void)
218 if (ppc_md.nvram_size)
219 return ppc_md.nvram_size();
222 EXPORT_SYMBOL(nvram_get_size);
224 void nvram_sync(void)
226 if (ppc_md.nvram_sync)
229 EXPORT_SYMBOL(nvram_sync);
231 #endif /* CONFIG_NVRAM */
233 int __init ppc_init(void)
235 /* clear the progress line */
237 ppc_md.progress(" ", 0xffff);
239 /* call platform init */
240 if (ppc_md.init != NULL) {
246 arch_initcall(ppc_init);
248 static void __init irqstack_early_init(void)
252 /* interrupt stacks must be in lowmem, we get that for free on ppc32
253 * as the memblock is limited to lowmem by default */
254 for_each_possible_cpu(i) {
255 softirq_ctx[i] = (struct thread_info *)
256 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
257 hardirq_ctx[i] = (struct thread_info *)
258 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
262 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
263 static void __init exc_lvl_early_init(void)
265 unsigned int i, hw_cpu;
267 /* interrupt stacks must be in lowmem, we get that for free on ppc32
268 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
269 for_each_possible_cpu(i) {
270 hw_cpu = get_hard_smp_processor_id(i);
271 critirq_ctx[hw_cpu] = (struct thread_info *)
272 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
274 dbgirq_ctx[hw_cpu] = (struct thread_info *)
275 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
276 mcheckirq_ctx[hw_cpu] = (struct thread_info *)
277 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
282 #define exc_lvl_early_init()
285 /* Warning, IO base is not yet inited */
286 void __init setup_arch(char **cmdline_p)
288 *cmdline_p = cmd_line;
290 /* so udelay does something sensible, assume <= 1000 bogomips */
291 loops_per_jiffy = 500000000 / HZ;
293 unflatten_device_tree();
296 if (ppc_md.init_early)
299 find_legacy_serial_ports();
301 smp_setup_cpu_maps();
303 /* Register early console */
304 register_early_udbg_console();
309 * Set cache line size based on type of cpu as a default.
310 * Systems with OF can look in the properties on the cpu node(s)
311 * for a possibly more accurate value.
313 dcache_bsize = cur_cpu_spec->dcache_bsize;
314 icache_bsize = cur_cpu_spec->icache_bsize;
316 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
317 ucache_bsize = icache_bsize = dcache_bsize;
319 /* reboot on panic */
325 init_mm.start_code = (unsigned long)_stext;
326 init_mm.end_code = (unsigned long) _etext;
327 init_mm.end_data = (unsigned long) _edata;
328 init_mm.brk = klimit;
330 exc_lvl_early_init();
332 irqstack_early_init();
334 /* set up the bootmem stuff with available memory */
336 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
338 #ifdef CONFIG_DUMMY_CONSOLE
339 conswitchp = &dummy_con;
342 if (ppc_md.setup_arch)
344 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
348 /* Initialize the MMU context management stuff */