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/system.h>
34 #include <asm/pmac_feature.h>
35 #include <asm/sections.h>
36 #include <asm/nvram.h>
39 #include <asm/serial.h>
41 #include <asm/mmu_context.h>
47 extern void bootx_init(unsigned long r4, unsigned long phys);
50 EXPORT_SYMBOL_GPL(boot_cpuid);
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));
109 return KERNELBASE + offset;
114 * Find out what kind of machine we're on and save any data we need
115 * from the early boot process (devtree is copied on pmac by prom_init()).
116 * This is called very early on the boot process, after a minimal
117 * MMU environment has been set up but before MMU_init is called.
119 notrace void __init machine_init(unsigned long dt_ptr)
123 /* Enable early debugging if any specified (see udbg.h) */
126 /* Do some early initialization based on the flat device tree */
127 early_init_devtree(__va(dt_ptr));
131 setup_kdump_trampoline();
134 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
135 cpu_has_feature(CPU_FTR_CAN_NAP))
136 ppc_md.power_save = ppc6xx_idle;
140 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
141 cpu_has_feature(CPU_FTR_CAN_NAP))
142 ppc_md.power_save = e500_idle;
145 ppc_md.progress("id mach(): done", 0x200);
148 #ifdef CONFIG_BOOKE_WDT
149 /* Checks wdt=x and wdt_period=xx command-line option */
150 notrace int __init early_parse_wdt(char *p)
152 if (p && strncmp(p, "0", 1) != 0)
153 booke_wdt_enabled = 1;
157 early_param("wdt", early_parse_wdt);
159 int __init early_parse_wdt_period (char *p)
162 booke_wdt_period = simple_strtoul(p, NULL, 0);
166 early_param("wdt_period", early_parse_wdt_period);
167 #endif /* CONFIG_BOOKE_WDT */
169 /* Checks "l2cr=xxxx" command-line option */
170 int __init ppc_setup_l2cr(char *str)
172 if (cpu_has_feature(CPU_FTR_L2CR)) {
173 unsigned long val = simple_strtoul(str, NULL, 0);
174 printk(KERN_INFO "l2cr set to %lx\n", val);
175 _set_L2CR(0); /* force invalidate by disable cache */
176 _set_L2CR(val); /* and enable it */
180 __setup("l2cr=", ppc_setup_l2cr);
182 /* Checks "l3cr=xxxx" command-line option */
183 int __init ppc_setup_l3cr(char *str)
185 if (cpu_has_feature(CPU_FTR_L3CR)) {
186 unsigned long val = simple_strtoul(str, NULL, 0);
187 printk(KERN_INFO "l3cr set to %lx\n", val);
188 _set_L3CR(val); /* and enable it */
192 __setup("l3cr=", ppc_setup_l3cr);
194 #ifdef CONFIG_GENERIC_NVRAM
196 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
197 unsigned char nvram_read_byte(int addr)
199 if (ppc_md.nvram_read_val)
200 return ppc_md.nvram_read_val(addr);
203 EXPORT_SYMBOL(nvram_read_byte);
205 void nvram_write_byte(unsigned char val, int addr)
207 if (ppc_md.nvram_write_val)
208 ppc_md.nvram_write_val(addr, val);
210 EXPORT_SYMBOL(nvram_write_byte);
212 ssize_t nvram_get_size(void)
214 if (ppc_md.nvram_size)
215 return ppc_md.nvram_size();
218 EXPORT_SYMBOL(nvram_get_size);
220 void nvram_sync(void)
222 if (ppc_md.nvram_sync)
225 EXPORT_SYMBOL(nvram_sync);
227 #endif /* CONFIG_NVRAM */
229 int __init ppc_init(void)
231 /* clear the progress line */
233 ppc_md.progress(" ", 0xffff);
235 /* call platform init */
236 if (ppc_md.init != NULL) {
242 arch_initcall(ppc_init);
244 static void __init irqstack_early_init(void)
248 /* interrupt stacks must be in lowmem, we get that for free on ppc32
249 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
250 for_each_possible_cpu(i) {
251 softirq_ctx[i] = (struct thread_info *)
252 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
253 hardirq_ctx[i] = (struct thread_info *)
254 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
258 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
259 static void __init exc_lvl_early_init(void)
261 unsigned int i, hw_cpu;
263 /* interrupt stacks must be in lowmem, we get that for free on ppc32
264 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
265 for_each_possible_cpu(i) {
266 hw_cpu = get_hard_smp_processor_id(i);
267 critirq_ctx[hw_cpu] = (struct thread_info *)
268 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
270 dbgirq_ctx[hw_cpu] = (struct thread_info *)
271 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
272 mcheckirq_ctx[hw_cpu] = (struct thread_info *)
273 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
278 #define exc_lvl_early_init()
281 /* Warning, IO base is not yet inited */
282 void __init setup_arch(char **cmdline_p)
284 *cmdline_p = cmd_line;
286 /* so udelay does something sensible, assume <= 1000 bogomips */
287 loops_per_jiffy = 500000000 / HZ;
289 unflatten_device_tree();
292 if (ppc_md.init_early)
295 find_legacy_serial_ports();
297 smp_setup_cpu_maps();
299 /* Register early console */
300 register_early_udbg_console();
305 * Set cache line size based on type of cpu as a default.
306 * Systems with OF can look in the properties on the cpu node(s)
307 * for a possibly more accurate value.
309 dcache_bsize = cur_cpu_spec->dcache_bsize;
310 icache_bsize = cur_cpu_spec->icache_bsize;
312 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
313 ucache_bsize = icache_bsize = dcache_bsize;
315 /* reboot on panic */
321 init_mm.start_code = (unsigned long)_stext;
322 init_mm.end_code = (unsigned long) _etext;
323 init_mm.end_data = (unsigned long) _edata;
324 init_mm.brk = klimit;
326 exc_lvl_early_init();
328 irqstack_early_init();
330 /* set up the bootmem stuff with available memory */
332 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
334 #ifdef CONFIG_DUMMY_CONSOLE
335 conswitchp = &dummy_con;
338 if (ppc_md.setup_arch)
340 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
344 /* Initialize the MMU context management stuff */