2 * Common prep/pmac/chrp boot and setup code.
5 #include <linux/config.h>
6 #include <linux/module.h>
7 #include <linux/string.h>
8 #include <linux/sched.h>
9 #include <linux/init.h>
10 #include <linux/kernel.h>
11 #include <linux/reboot.h>
12 #include <linux/delay.h>
13 #include <linux/initrd.h>
14 #include <linux/ide.h>
15 #include <linux/tty.h>
16 #include <linux/bootmem.h>
17 #include <linux/seq_file.h>
18 #include <linux/root_dev.h>
19 #include <linux/cpu.h>
20 #include <linux/console.h>
22 #include <asm/residual.h>
25 #include <asm/processor.h>
26 #include <asm/pgtable.h>
27 #include <asm/setup.h>
28 #include <asm/amigappc.h>
31 #include <asm/cputable.h>
32 #include <asm/bootx.h>
33 #include <asm/btext.h>
34 #include <asm/machdep.h>
35 #include <asm/uaccess.h>
36 #include <asm/system.h>
37 #include <asm/pmac_feature.h>
38 #include <asm/sections.h>
39 #include <asm/nvram.h>
42 #include <asm/serial.h>
49 #if defined CONFIG_KGDB
53 extern void platform_init(void);
54 extern void bootx_init(unsigned long r4, unsigned long phys);
56 boot_infos_t *boot_infos;
57 struct ide_machdep_calls ppc_ide_md;
60 EXPORT_SYMBOL_GPL(boot_cpuid);
63 unsigned long ISA_DMA_THRESHOLD;
64 unsigned int DMA_MODE_READ;
65 unsigned int DMA_MODE_WRITE;
69 #ifdef CONFIG_PPC_MULTIPLATFORM
70 extern void prep_init(void);
71 extern void pmac_init(void);
72 extern void chrp_init(void);
75 #endif /* CONFIG_PPC_MULTIPLATFORM */
77 #ifdef CONFIG_MAGIC_SYSRQ
78 unsigned long SYSRQ_KEY = 0x54;
79 #endif /* CONFIG_MAGIC_SYSRQ */
81 #ifdef CONFIG_VGA_CONSOLE
82 unsigned long vgacon_remap_base;
85 struct machdep_calls ppc_md;
86 EXPORT_SYMBOL(ppc_md);
89 * These are used in binfmt_elf.c to put aux entries on the stack
90 * for each elf executable being started.
97 * We're called here very early in the boot. We determine the machine
98 * type and call the appropriate low-level setup functions.
99 * -- Cort <cort@fsmlabs.com>
101 * Note that the kernel may be running at an address which is different
102 * from the address that it was linked at, so we must use RELOC/PTRRELOC
103 * to access static data (including strings). -- paulus
105 unsigned long __init early_init(unsigned long dt_ptr)
107 unsigned long offset = reloc_offset();
109 /* First zero the BSS -- use memset_io, some platforms don't have
111 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, _end - __bss_start);
114 * Identify the CPU type and fix up code sections
115 * that depend on which cpu we have.
117 identify_cpu(offset, 0);
118 do_cpu_ftr_fixups(offset);
120 return KERNELBASE + offset;
123 #ifdef CONFIG_PPC_MULTIPLATFORM
125 * The PPC_MULTIPLATFORM version of platform_init...
127 void __init platform_init(void)
129 /* if we didn't get any bootinfo telling us what we are... */
131 /* prep boot loader tells us if we're prep or not */
132 if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
133 _machine = _MACH_prep;
136 #ifdef CONFIG_PPC_PREP
137 /* not much more to do here, if prep */
138 if (_machine == _MACH_prep) {
145 if (strstr(cmd_line, "adb_sync")) {
146 extern int __adb_probe_sync;
147 __adb_probe_sync = 1;
149 #endif /* CONFIG_ADB */
152 #ifdef CONFIG_PPC_PMAC
157 #ifdef CONFIG_PPC_CHRP
167 * Find out what kind of machine we're on and save any data we need
168 * from the early boot process (devtree is copied on pmac by prom_init()).
169 * This is called very early on the boot process, after a minimal
170 * MMU environment has been set up but before MMU_init is called.
172 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
174 /* If btext is enabled, we might have a BAT setup for early display,
175 * thus we do enable some very basic udbg output
177 #ifdef CONFIG_BOOTX_TEXT
178 udbg_putc = btext_drawchar;
181 /* Do some early initialization based on the flat device tree */
182 early_init_devtree(__va(dt_ptr));
184 /* Check default command line */
185 #ifdef CONFIG_CMDLINE
186 if (cmd_line[0] == 0)
187 strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
188 #endif /* CONFIG_CMDLINE */
190 /* Base init based on machine type */
194 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
195 cpu_has_feature(CPU_FTR_CAN_NAP))
196 ppc_md.power_save = ppc6xx_idle;
200 ppc_md.progress("id mach(): done", 0x200);
203 #ifdef CONFIG_BOOKE_WDT
204 /* Checks wdt=x and wdt_period=xx command-line option */
205 int __init early_parse_wdt(char *p)
207 if (p && strncmp(p, "0", 1) != 0)
208 booke_wdt_enabled = 1;
212 early_param("wdt", early_parse_wdt);
214 int __init early_parse_wdt_period (char *p)
217 booke_wdt_period = simple_strtoul(p, NULL, 0);
221 early_param("wdt_period", early_parse_wdt_period);
222 #endif /* CONFIG_BOOKE_WDT */
224 /* Checks "l2cr=xxxx" command-line option */
225 int __init ppc_setup_l2cr(char *str)
227 if (cpu_has_feature(CPU_FTR_L2CR)) {
228 unsigned long val = simple_strtoul(str, NULL, 0);
229 printk(KERN_INFO "l2cr set to %lx\n", val);
230 _set_L2CR(0); /* force invalidate by disable cache */
231 _set_L2CR(val); /* and enable it */
235 __setup("l2cr=", ppc_setup_l2cr);
237 #ifdef CONFIG_GENERIC_NVRAM
239 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
240 unsigned char nvram_read_byte(int addr)
242 if (ppc_md.nvram_read_val)
243 return ppc_md.nvram_read_val(addr);
246 EXPORT_SYMBOL(nvram_read_byte);
248 void nvram_write_byte(unsigned char val, int addr)
250 if (ppc_md.nvram_write_val)
251 ppc_md.nvram_write_val(addr, val);
253 EXPORT_SYMBOL(nvram_write_byte);
255 void nvram_sync(void)
257 if (ppc_md.nvram_sync)
260 EXPORT_SYMBOL(nvram_sync);
262 #endif /* CONFIG_NVRAM */
264 static struct cpu cpu_devices[NR_CPUS];
266 int __init ppc_init(void)
270 /* clear the progress line */
271 if ( ppc_md.progress ) ppc_md.progress(" ", 0xffff);
273 /* register CPU devices */
275 register_cpu(&cpu_devices[i], i, NULL);
277 /* call platform init */
278 if (ppc_md.init != NULL) {
284 arch_initcall(ppc_init);
286 /* Warning, IO base is not yet inited */
287 void __init setup_arch(char **cmdline_p)
289 extern void do_init_bootmem(void);
291 /* so udelay does something sensible, assume <= 1000 bogomips */
292 loops_per_jiffy = 500000000 / HZ;
294 unflatten_device_tree();
297 if (ppc_md.init_early)
300 find_legacy_serial_ports();
301 finish_device_tree();
303 smp_setup_cpu_maps();
305 #ifdef CONFIG_XMON_DEFAULT
308 /* Register early console */
309 register_early_udbg_console();
311 #if defined(CONFIG_KGDB)
312 if (ppc_md.kgdb_map_scc)
313 ppc_md.kgdb_map_scc();
315 if (strstr(cmd_line, "gdb")) {
317 ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
318 printk("kgdb breakpoint activated\n");
324 * Set cache line size based on type of cpu as a default.
325 * Systems with OF can look in the properties on the cpu node(s)
326 * for a possibly more accurate value.
328 if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
329 dcache_bsize = cur_cpu_spec->dcache_bsize;
330 icache_bsize = cur_cpu_spec->icache_bsize;
333 ucache_bsize = dcache_bsize = icache_bsize
334 = cur_cpu_spec->dcache_bsize;
336 /* reboot on panic */
339 init_mm.start_code = PAGE_OFFSET;
340 init_mm.end_code = (unsigned long) _etext;
341 init_mm.end_data = (unsigned long) _edata;
342 init_mm.brk = klimit;
344 /* Save unparsed command line copy for /proc/cmdline */
345 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
346 *cmdline_p = cmd_line;
350 /* set up the bootmem stuff with available memory */
352 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
354 #ifdef CONFIG_DUMMY_CONSOLE
355 conswitchp = &dummy_con;
359 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
363 /* this is for modules since _machine can be a define -- Cort */
364 ppc_md.ppc_machine = _machine;