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>
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/system.h>
33 #include <asm/pmac_feature.h>
34 #include <asm/sections.h>
35 #include <asm/nvram.h>
38 #include <asm/serial.h>
45 #if defined CONFIG_KGDB
49 extern void bootx_init(unsigned long r4, unsigned long phys);
52 EXPORT_SYMBOL_GPL(boot_cpuid);
55 unsigned long ISA_DMA_THRESHOLD;
56 unsigned int DMA_MODE_READ;
57 unsigned int DMA_MODE_WRITE;
61 #ifdef CONFIG_VGA_CONSOLE
62 unsigned long vgacon_remap_base;
63 EXPORT_SYMBOL(vgacon_remap_base);
67 * These are used in binfmt_elf.c to put aux entries on the stack
68 * for each elf executable being started.
75 * We're called here very early in the boot. We determine the machine
76 * type and call the appropriate low-level setup functions.
77 * -- Cort <cort@fsmlabs.com>
79 * Note that the kernel may be running at an address which is different
80 * from the address that it was linked at, so we must use RELOC/PTRRELOC
81 * to access static data (including strings). -- paulus
83 unsigned long __init early_init(unsigned long dt_ptr)
85 unsigned long offset = reloc_offset();
86 struct cpu_spec *spec;
88 /* First zero the BSS -- use memset_io, some platforms don't have
90 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
91 __bss_stop - __bss_start);
94 * Identify the CPU type and fix up code sections
95 * that depend on which cpu we have.
97 spec = identify_cpu(offset, mfspr(SPRN_PVR));
99 do_feature_fixups(spec->cpu_features,
100 PTRRELOC(&__start___ftr_fixup),
101 PTRRELOC(&__stop___ftr_fixup));
103 return KERNELBASE + offset;
108 * Find out what kind of machine we're on and save any data we need
109 * from the early boot process (devtree is copied on pmac by prom_init()).
110 * This is called very early on the boot process, after a minimal
111 * MMU environment has been set up but before MMU_init is called.
113 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
115 /* Enable early debugging if any specified (see udbg.h) */
118 /* Do some early initialization based on the flat device tree */
119 early_init_devtree(__va(dt_ptr));
124 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
125 cpu_has_feature(CPU_FTR_CAN_NAP))
126 ppc_md.power_save = ppc6xx_idle;
130 ppc_md.progress("id mach(): done", 0x200);
133 #ifdef CONFIG_BOOKE_WDT
134 /* Checks wdt=x and wdt_period=xx command-line option */
135 int __init early_parse_wdt(char *p)
137 if (p && strncmp(p, "0", 1) != 0)
138 booke_wdt_enabled = 1;
142 early_param("wdt", early_parse_wdt);
144 int __init early_parse_wdt_period (char *p)
147 booke_wdt_period = simple_strtoul(p, NULL, 0);
151 early_param("wdt_period", early_parse_wdt_period);
152 #endif /* CONFIG_BOOKE_WDT */
154 /* Checks "l2cr=xxxx" command-line option */
155 int __init ppc_setup_l2cr(char *str)
157 if (cpu_has_feature(CPU_FTR_L2CR)) {
158 unsigned long val = simple_strtoul(str, NULL, 0);
159 printk(KERN_INFO "l2cr set to %lx\n", val);
160 _set_L2CR(0); /* force invalidate by disable cache */
161 _set_L2CR(val); /* and enable it */
165 __setup("l2cr=", ppc_setup_l2cr);
167 /* Checks "l3cr=xxxx" command-line option */
168 int __init ppc_setup_l3cr(char *str)
170 if (cpu_has_feature(CPU_FTR_L3CR)) {
171 unsigned long val = simple_strtoul(str, NULL, 0);
172 printk(KERN_INFO "l3cr set to %lx\n", val);
173 _set_L3CR(val); /* and enable it */
177 __setup("l3cr=", ppc_setup_l3cr);
179 #ifdef CONFIG_GENERIC_NVRAM
181 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
182 unsigned char nvram_read_byte(int addr)
184 if (ppc_md.nvram_read_val)
185 return ppc_md.nvram_read_val(addr);
188 EXPORT_SYMBOL(nvram_read_byte);
190 void nvram_write_byte(unsigned char val, int addr)
192 if (ppc_md.nvram_write_val)
193 ppc_md.nvram_write_val(addr, val);
195 EXPORT_SYMBOL(nvram_write_byte);
197 void nvram_sync(void)
199 if (ppc_md.nvram_sync)
202 EXPORT_SYMBOL(nvram_sync);
204 #endif /* CONFIG_NVRAM */
206 static DEFINE_PER_CPU(struct cpu, cpu_devices);
208 int __init ppc_init(void)
212 /* clear the progress line */
214 ppc_md.progress(" ", 0xffff);
216 /* register CPU devices */
217 for_each_possible_cpu(cpu) {
218 struct cpu *c = &per_cpu(cpu_devices, cpu);
220 register_cpu(c, cpu);
223 /* call platform init */
224 if (ppc_md.init != NULL) {
230 arch_initcall(ppc_init);
232 /* Warning, IO base is not yet inited */
233 void __init setup_arch(char **cmdline_p)
235 *cmdline_p = cmd_line;
237 /* so udelay does something sensible, assume <= 1000 bogomips */
238 loops_per_jiffy = 500000000 / HZ;
240 unflatten_device_tree();
243 if (ppc_md.init_early)
246 find_legacy_serial_ports();
248 smp_setup_cpu_maps();
250 /* Register early console */
251 register_early_udbg_console();
255 #if defined(CONFIG_KGDB)
256 if (ppc_md.kgdb_map_scc)
257 ppc_md.kgdb_map_scc();
259 if (strstr(cmd_line, "gdb")) {
261 ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
262 printk("kgdb breakpoint activated\n");
268 * Set cache line size based on type of cpu as a default.
269 * Systems with OF can look in the properties on the cpu node(s)
270 * for a possibly more accurate value.
272 dcache_bsize = cur_cpu_spec->dcache_bsize;
273 icache_bsize = cur_cpu_spec->icache_bsize;
275 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
276 ucache_bsize = icache_bsize = dcache_bsize;
278 /* reboot on panic */
284 init_mm.start_code = (unsigned long)_stext;
285 init_mm.end_code = (unsigned long) _etext;
286 init_mm.end_data = (unsigned long) _edata;
287 init_mm.brk = klimit;
289 /* set up the bootmem stuff with available memory */
291 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
293 #ifdef CONFIG_DUMMY_CONSOLE
294 conswitchp = &dummy_con;
297 if (ppc_md.setup_arch)
299 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);