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/lmb.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>
46 extern void bootx_init(unsigned long r4, unsigned long phys);
49 EXPORT_SYMBOL_GPL(boot_cpuid);
52 int smp_hw_index[NR_CPUS];
54 unsigned long ISA_DMA_THRESHOLD;
55 unsigned int DMA_MODE_READ;
56 unsigned int DMA_MODE_WRITE;
58 #ifdef CONFIG_VGA_CONSOLE
59 unsigned long vgacon_remap_base;
60 EXPORT_SYMBOL(vgacon_remap_base);
64 * These are used in binfmt_elf.c to put aux entries on the stack
65 * for each elf executable being started.
72 * We're called here very early in the boot. We determine the machine
73 * type and call the appropriate low-level setup functions.
74 * -- Cort <cort@fsmlabs.com>
76 * Note that the kernel may be running at an address which is different
77 * from the address that it was linked at, so we must use RELOC/PTRRELOC
78 * to access static data (including strings). -- paulus
80 notrace unsigned long __init early_init(unsigned long dt_ptr)
82 unsigned long offset = reloc_offset();
83 struct cpu_spec *spec;
85 /* First zero the BSS -- use memset_io, some platforms don't have
87 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
88 __bss_stop - __bss_start);
91 * Identify the CPU type and fix up code sections
92 * that depend on which cpu we have.
94 spec = identify_cpu(offset, mfspr(SPRN_PVR));
96 do_feature_fixups(spec->cpu_features,
97 PTRRELOC(&__start___ftr_fixup),
98 PTRRELOC(&__stop___ftr_fixup));
100 do_feature_fixups(spec->mmu_features,
101 PTRRELOC(&__start___mmu_ftr_fixup),
102 PTRRELOC(&__stop___mmu_ftr_fixup));
104 do_lwsync_fixups(spec->cpu_features,
105 PTRRELOC(&__start___lwsync_fixup),
106 PTRRELOC(&__stop___lwsync_fixup));
108 return KERNELBASE + offset;
113 * Find out what kind of machine we're on and save any data we need
114 * from the early boot process (devtree is copied on pmac by prom_init()).
115 * This is called very early on the boot process, after a minimal
116 * MMU environment has been set up but before MMU_init is called.
118 notrace void __init machine_init(unsigned long dt_ptr)
120 /* Enable early debugging if any specified (see udbg.h) */
123 /* Do some early initialization based on the flat device tree */
124 early_init_devtree(__va(dt_ptr));
129 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
130 cpu_has_feature(CPU_FTR_CAN_NAP))
131 ppc_md.power_save = ppc6xx_idle;
135 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
136 cpu_has_feature(CPU_FTR_CAN_NAP))
137 ppc_md.power_save = e500_idle;
140 ppc_md.progress("id mach(): done", 0x200);
143 #ifdef CONFIG_BOOKE_WDT
144 /* Checks wdt=x and wdt_period=xx command-line option */
145 notrace int __init early_parse_wdt(char *p)
147 if (p && strncmp(p, "0", 1) != 0)
148 booke_wdt_enabled = 1;
152 early_param("wdt", early_parse_wdt);
154 int __init early_parse_wdt_period (char *p)
157 booke_wdt_period = simple_strtoul(p, NULL, 0);
161 early_param("wdt_period", early_parse_wdt_period);
162 #endif /* CONFIG_BOOKE_WDT */
164 /* Checks "l2cr=xxxx" command-line option */
165 int __init ppc_setup_l2cr(char *str)
167 if (cpu_has_feature(CPU_FTR_L2CR)) {
168 unsigned long val = simple_strtoul(str, NULL, 0);
169 printk(KERN_INFO "l2cr set to %lx\n", val);
170 _set_L2CR(0); /* force invalidate by disable cache */
171 _set_L2CR(val); /* and enable it */
175 __setup("l2cr=", ppc_setup_l2cr);
177 /* Checks "l3cr=xxxx" command-line option */
178 int __init ppc_setup_l3cr(char *str)
180 if (cpu_has_feature(CPU_FTR_L3CR)) {
181 unsigned long val = simple_strtoul(str, NULL, 0);
182 printk(KERN_INFO "l3cr set to %lx\n", val);
183 _set_L3CR(val); /* and enable it */
187 __setup("l3cr=", ppc_setup_l3cr);
189 #ifdef CONFIG_GENERIC_NVRAM
191 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
192 unsigned char nvram_read_byte(int addr)
194 if (ppc_md.nvram_read_val)
195 return ppc_md.nvram_read_val(addr);
198 EXPORT_SYMBOL(nvram_read_byte);
200 void nvram_write_byte(unsigned char val, int addr)
202 if (ppc_md.nvram_write_val)
203 ppc_md.nvram_write_val(addr, val);
205 EXPORT_SYMBOL(nvram_write_byte);
207 void nvram_sync(void)
209 if (ppc_md.nvram_sync)
212 EXPORT_SYMBOL(nvram_sync);
214 #endif /* CONFIG_NVRAM */
216 int __init ppc_init(void)
218 /* clear the progress line */
220 ppc_md.progress(" ", 0xffff);
222 /* call platform init */
223 if (ppc_md.init != NULL) {
229 arch_initcall(ppc_init);
231 #ifdef CONFIG_IRQSTACKS
232 static void __init irqstack_early_init(void)
236 /* interrupt stacks must be in lowmem, we get that for free on ppc32
237 * as the lmb is limited to lowmem by LMB_REAL_LIMIT */
238 for_each_possible_cpu(i) {
239 softirq_ctx[i] = (struct thread_info *)
240 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
241 hardirq_ctx[i] = (struct thread_info *)
242 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
246 #define irqstack_early_init()
249 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
250 static void __init exc_lvl_early_init(void)
254 /* interrupt stacks must be in lowmem, we get that for free on ppc32
255 * as the lmb is limited to lowmem by LMB_REAL_LIMIT */
256 for_each_possible_cpu(i) {
257 critirq_ctx[i] = (struct thread_info *)
258 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
260 dbgirq_ctx[i] = (struct thread_info *)
261 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
262 mcheckirq_ctx[i] = (struct thread_info *)
263 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
268 #define exc_lvl_early_init()
271 /* Warning, IO base is not yet inited */
272 void __init setup_arch(char **cmdline_p)
274 *cmdline_p = cmd_line;
276 /* so udelay does something sensible, assume <= 1000 bogomips */
277 loops_per_jiffy = 500000000 / HZ;
279 unflatten_device_tree();
282 if (ppc_md.init_early)
285 find_legacy_serial_ports();
287 smp_setup_cpu_maps();
289 /* Register early console */
290 register_early_udbg_console();
295 * Set cache line size based on type of cpu as a default.
296 * Systems with OF can look in the properties on the cpu node(s)
297 * for a possibly more accurate value.
299 dcache_bsize = cur_cpu_spec->dcache_bsize;
300 icache_bsize = cur_cpu_spec->icache_bsize;
302 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
303 ucache_bsize = icache_bsize = dcache_bsize;
305 /* reboot on panic */
311 init_mm.start_code = (unsigned long)_stext;
312 init_mm.end_code = (unsigned long) _etext;
313 init_mm.end_data = (unsigned long) _edata;
314 init_mm.brk = klimit;
316 exc_lvl_early_init();
318 irqstack_early_init();
320 /* set up the bootmem stuff with available memory */
322 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
324 #ifdef CONFIG_DUMMY_CONSOLE
325 conswitchp = &dummy_con;
328 if (ppc_md.setup_arch)
330 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);