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
71 #endif /* CONFIG_PPC_MULTIPLATFORM */
73 #ifdef CONFIG_MAGIC_SYSRQ
74 unsigned long SYSRQ_KEY = 0x54;
75 #endif /* CONFIG_MAGIC_SYSRQ */
77 #ifdef CONFIG_VGA_CONSOLE
78 unsigned long vgacon_remap_base;
82 * These are used in binfmt_elf.c to put aux entries on the stack
83 * for each elf executable being started.
90 * We're called here very early in the boot. We determine the machine
91 * type and call the appropriate low-level setup functions.
92 * -- Cort <cort@fsmlabs.com>
94 * Note that the kernel may be running at an address which is different
95 * from the address that it was linked at, so we must use RELOC/PTRRELOC
96 * to access static data (including strings). -- paulus
98 unsigned long __init early_init(unsigned long dt_ptr)
100 unsigned long offset = reloc_offset();
102 /* First zero the BSS -- use memset_io, some platforms don't have
104 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, _end - __bss_start);
107 * Identify the CPU type and fix up code sections
108 * that depend on which cpu we have.
110 identify_cpu(offset, 0);
111 do_cpu_ftr_fixups(offset);
113 return KERNELBASE + offset;
118 * Find out what kind of machine we're on and save any data we need
119 * from the early boot process (devtree is copied on pmac by prom_init()).
120 * This is called very early on the boot process, after a minimal
121 * MMU environment has been set up but before MMU_init is called.
123 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
125 /* If btext is enabled, we might have a BAT setup for early display,
126 * thus we do enable some very basic udbg output
128 #ifdef CONFIG_BOOTX_TEXT
129 udbg_putc = btext_drawchar;
132 /* Do some early initialization based on the flat device tree */
133 early_init_devtree(__va(dt_ptr));
135 /* Check default command line */
136 #ifdef CONFIG_CMDLINE
137 if (cmd_line[0] == 0)
138 strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
139 #endif /* CONFIG_CMDLINE */
141 #ifdef CONFIG_PPC_MULTIPLATFORM
144 /* Base init based on machine type. Obsoloete, please kill ! */
149 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
150 cpu_has_feature(CPU_FTR_CAN_NAP))
151 ppc_md.power_save = ppc6xx_idle;
155 ppc_md.progress("id mach(): done", 0x200);
158 #ifdef CONFIG_BOOKE_WDT
159 /* Checks wdt=x and wdt_period=xx command-line option */
160 int __init early_parse_wdt(char *p)
162 if (p && strncmp(p, "0", 1) != 0)
163 booke_wdt_enabled = 1;
167 early_param("wdt", early_parse_wdt);
169 int __init early_parse_wdt_period (char *p)
172 booke_wdt_period = simple_strtoul(p, NULL, 0);
176 early_param("wdt_period", early_parse_wdt_period);
177 #endif /* CONFIG_BOOKE_WDT */
179 /* Checks "l2cr=xxxx" command-line option */
180 int __init ppc_setup_l2cr(char *str)
182 if (cpu_has_feature(CPU_FTR_L2CR)) {
183 unsigned long val = simple_strtoul(str, NULL, 0);
184 printk(KERN_INFO "l2cr set to %lx\n", val);
185 _set_L2CR(0); /* force invalidate by disable cache */
186 _set_L2CR(val); /* and enable it */
190 __setup("l2cr=", ppc_setup_l2cr);
192 #ifdef CONFIG_GENERIC_NVRAM
194 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
195 unsigned char nvram_read_byte(int addr)
197 if (ppc_md.nvram_read_val)
198 return ppc_md.nvram_read_val(addr);
201 EXPORT_SYMBOL(nvram_read_byte);
203 void nvram_write_byte(unsigned char val, int addr)
205 if (ppc_md.nvram_write_val)
206 ppc_md.nvram_write_val(addr, val);
208 EXPORT_SYMBOL(nvram_write_byte);
210 void nvram_sync(void)
212 if (ppc_md.nvram_sync)
215 EXPORT_SYMBOL(nvram_sync);
217 #endif /* CONFIG_NVRAM */
219 static struct cpu cpu_devices[NR_CPUS];
221 int __init ppc_init(void)
225 /* clear the progress line */
226 if ( ppc_md.progress ) ppc_md.progress(" ", 0xffff);
228 /* register CPU devices */
229 for_each_possible_cpu(i)
230 register_cpu(&cpu_devices[i], i, NULL);
232 /* call platform init */
233 if (ppc_md.init != NULL) {
239 arch_initcall(ppc_init);
241 /* Warning, IO base is not yet inited */
242 void __init setup_arch(char **cmdline_p)
244 extern void do_init_bootmem(void);
246 /* so udelay does something sensible, assume <= 1000 bogomips */
247 loops_per_jiffy = 500000000 / HZ;
249 unflatten_device_tree();
252 if (ppc_md.init_early)
255 find_legacy_serial_ports();
256 finish_device_tree();
258 smp_setup_cpu_maps();
260 #ifdef CONFIG_XMON_DEFAULT
263 /* Register early console */
264 register_early_udbg_console();
266 #if defined(CONFIG_KGDB)
267 if (ppc_md.kgdb_map_scc)
268 ppc_md.kgdb_map_scc();
270 if (strstr(cmd_line, "gdb")) {
272 ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
273 printk("kgdb breakpoint activated\n");
279 * Set cache line size based on type of cpu as a default.
280 * Systems with OF can look in the properties on the cpu node(s)
281 * for a possibly more accurate value.
283 if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
284 dcache_bsize = cur_cpu_spec->dcache_bsize;
285 icache_bsize = cur_cpu_spec->icache_bsize;
288 ucache_bsize = dcache_bsize = icache_bsize
289 = cur_cpu_spec->dcache_bsize;
291 /* reboot on panic */
294 init_mm.start_code = PAGE_OFFSET;
295 init_mm.end_code = (unsigned long) _etext;
296 init_mm.end_data = (unsigned long) _edata;
297 init_mm.brk = klimit;
299 /* Save unparsed command line copy for /proc/cmdline */
300 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
301 *cmdline_p = cmd_line;
305 /* set up the bootmem stuff with available memory */
307 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
309 #ifdef CONFIG_DUMMY_CONSOLE
310 conswitchp = &dummy_con;
314 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);