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/bootinfo.h>
28 #include <asm/setup.h>
29 #include <asm/amigappc.h>
32 #include <asm/cputable.h>
33 #include <asm/bootx.h>
34 #include <asm/btext.h>
35 #include <asm/machdep.h>
36 #include <asm/uaccess.h>
37 #include <asm/system.h>
38 #include <asm/pmac_feature.h>
39 #include <asm/sections.h>
40 #include <asm/nvram.h>
46 #if defined CONFIG_KGDB
50 extern void platform_init(void);
51 extern void bootx_init(unsigned long r4, unsigned long phys);
53 extern void ppc6xx_idle(void);
54 extern void power4_idle(void);
56 boot_infos_t *boot_infos;
57 struct ide_machdep_calls ppc_ide_md;
59 /* XXX should go elsewhere */
60 int __irq_offset_value;
61 EXPORT_SYMBOL(__irq_offset_value);
63 /* Used with the BI_MEMSIZE bootinfo parameter to store the memory
64 size value reported by the boot loader. */
65 unsigned long boot_mem_size;
67 unsigned long ISA_DMA_THRESHOLD;
68 unsigned int DMA_MODE_READ;
69 unsigned int DMA_MODE_WRITE;
73 #ifdef CONFIG_PPC_MULTIPLATFORM
76 extern void prep_init(void);
77 extern void pmac_init(void);
78 extern void chrp_init(void);
81 #endif /* CONFIG_PPC_MULTIPLATFORM */
83 #ifdef CONFIG_MAGIC_SYSRQ
84 unsigned long SYSRQ_KEY = 0x54;
85 #endif /* CONFIG_MAGIC_SYSRQ */
87 #ifdef CONFIG_VGA_CONSOLE
88 unsigned long vgacon_remap_base;
91 struct machdep_calls ppc_md;
92 EXPORT_SYMBOL(ppc_md);
95 * These are used in binfmt_elf.c to put aux entries on the stack
96 * for each elf executable being started.
102 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_FB_VGA16) || \
103 defined(CONFIG_FB_VGA16_MODULE) || defined(CONFIG_FB_VESA)
104 struct screen_info screen_info = {
105 0, 25, /* orig-x, orig-y */
107 0, /* orig-video-page */
108 0, /* orig-video-mode */
109 80, /* orig-video-cols */
110 0,0,0, /* ega_ax, ega_bx, ega_cx */
111 25, /* orig-video-lines */
112 1, /* orig-video-isVGA */
113 16 /* orig-video-points */
115 #endif /* CONFIG_VGA_CONSOLE || CONFIG_FB_VGA16 || CONFIG_FB_VESA */
118 * We're called here very early in the boot. We determine the machine
119 * type and call the appropriate low-level setup functions.
120 * -- Cort <cort@fsmlabs.com>
122 * Note that the kernel may be running at an address which is different
123 * from the address that it was linked at, so we must use RELOC/PTRRELOC
124 * to access static data (including strings). -- paulus
126 unsigned long __init early_init(unsigned long dt_ptr)
128 unsigned long offset = reloc_offset();
130 /* First zero the BSS -- use memset_io, some platforms don't have
132 memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);
135 * Identify the CPU type and fix up code sections
136 * that depend on which cpu we have.
138 identify_cpu(offset, 0);
139 do_cpu_ftr_fixups(offset);
141 return KERNELBASE + offset;
144 #ifdef CONFIG_PPC_MULTIPLATFORM
146 * The PPC_MULTIPLATFORM version of platform_init...
148 void __init platform_init(void)
150 /* if we didn't get any bootinfo telling us what we are... */
152 /* prep boot loader tells us if we're prep or not */
153 if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
154 _machine = _MACH_prep;
157 #ifdef CONFIG_PPC_PREP
158 /* not much more to do here, if prep */
159 if (_machine == _MACH_prep) {
166 if (strstr(cmd_line, "adb_sync")) {
167 extern int __adb_probe_sync;
168 __adb_probe_sync = 1;
170 #endif /* CONFIG_ADB */
173 #ifdef CONFIG_PPC_PMAC
178 #ifdef CONFIG_PPC_CHRP
188 * Find out what kind of machine we're on and save any data we need
189 * from the early boot process (devtree is copied on pmac by prom_init()).
190 * This is called very early on the boot process, after a minimal
191 * MMU environment has been set up but before MMU_init is called.
193 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
195 early_init_devtree(__va(dt_ptr));
197 #ifdef CONFIG_CMDLINE
198 strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
199 #endif /* CONFIG_CMDLINE */
204 ppc_md.power_save = ppc6xx_idle;
208 ppc_md.progress("id mach(): done", 0x200);
211 #ifdef CONFIG_BOOKE_WDT
212 /* Checks wdt=x and wdt_period=xx command-line option */
213 int __init early_parse_wdt(char *p)
215 if (p && strncmp(p, "0", 1) != 0)
216 booke_wdt_enabled = 1;
220 early_param("wdt", early_parse_wdt);
222 int __init early_parse_wdt_period (char *p)
225 booke_wdt_period = simple_strtoul(p, NULL, 0);
229 early_param("wdt_period", early_parse_wdt_period);
230 #endif /* CONFIG_BOOKE_WDT */
232 /* Checks "l2cr=xxxx" command-line option */
233 int __init ppc_setup_l2cr(char *str)
235 if (cpu_has_feature(CPU_FTR_L2CR)) {
236 unsigned long val = simple_strtoul(str, NULL, 0);
237 printk(KERN_INFO "l2cr set to %lx\n", val);
238 _set_L2CR(0); /* force invalidate by disable cache */
239 _set_L2CR(val); /* and enable it */
243 __setup("l2cr=", ppc_setup_l2cr);
245 #ifdef CONFIG_GENERIC_NVRAM
247 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
248 unsigned char nvram_read_byte(int addr)
250 if (ppc_md.nvram_read_val)
251 return ppc_md.nvram_read_val(addr);
254 EXPORT_SYMBOL(nvram_read_byte);
256 void nvram_write_byte(unsigned char val, int addr)
258 if (ppc_md.nvram_write_val)
259 ppc_md.nvram_write_val(addr, val);
261 EXPORT_SYMBOL(nvram_write_byte);
263 void nvram_sync(void)
265 if (ppc_md.nvram_sync)
268 EXPORT_SYMBOL(nvram_sync);
270 #endif /* CONFIG_NVRAM */
272 static struct cpu cpu_devices[NR_CPUS];
274 int __init ppc_init(void)
278 /* clear the progress line */
279 if ( ppc_md.progress ) ppc_md.progress(" ", 0xffff);
281 /* register CPU devices */
282 for (i = 0; i < NR_CPUS; i++)
284 register_cpu(&cpu_devices[i], i, NULL);
286 /* call platform init */
287 if (ppc_md.init != NULL) {
293 arch_initcall(ppc_init);
295 /* Warning, IO base is not yet inited */
296 void __init setup_arch(char **cmdline_p)
299 extern void do_init_bootmem(void);
301 /* so udelay does something sensible, assume <= 1000 bogomips */
302 loops_per_jiffy = 500000000 / HZ;
304 unflatten_device_tree();
305 finish_device_tree();
307 #ifdef CONFIG_BOOTX_TEXT
311 #ifdef CONFIG_PPC_PMAC
312 /* This could be called "early setup arch", it must be done
313 * now because xmon need it
315 if (_machine == _MACH_Pmac)
316 pmac_feature_init(); /* New cool way */
321 if (strstr(cmd_line, "xmon"))
323 #endif /* CONFIG_XMON */
324 if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
326 #if defined(CONFIG_KGDB)
327 if (ppc_md.kgdb_map_scc)
328 ppc_md.kgdb_map_scc();
330 if (strstr(cmd_line, "gdb")) {
332 ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
333 printk("kgdb breakpoint activated\n");
339 * Set cache line size based on type of cpu as a default.
340 * Systems with OF can look in the properties on the cpu node(s)
341 * for a possibly more accurate value.
343 if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
344 dcache_bsize = cur_cpu_spec->dcache_bsize;
345 icache_bsize = cur_cpu_spec->icache_bsize;
348 ucache_bsize = dcache_bsize = icache_bsize
349 = cur_cpu_spec->dcache_bsize;
351 /* reboot on panic */
354 init_mm.start_code = PAGE_OFFSET;
355 init_mm.end_code = (unsigned long) _etext;
356 init_mm.end_data = (unsigned long) _edata;
357 init_mm.brk = (unsigned long) klimit;
359 /* Save unparsed command line copy for /proc/cmdline */
360 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
361 *cmdline_p = cmd_line;
365 /* set up the bootmem stuff with available memory */
367 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
369 #ifdef CONFIG_PPC_OCP
370 /* Initialize OCP device list */
372 if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
375 #ifdef CONFIG_DUMMY_CONSOLE
376 conswitchp = &dummy_con;
380 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
384 /* this is for modules since _machine can be a define -- Cort */
385 ppc_md.ppc_machine = _machine;