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/ide.h>
14 #include <linux/tty.h>
15 #include <linux/bootmem.h>
16 #include <linux/seq_file.h>
17 #include <linux/root_dev.h>
18 #include <linux/cpu.h>
19 #include <linux/console.h>
21 #include <asm/residual.h>
24 #include <asm/processor.h>
25 #include <asm/pgtable.h>
26 #include <asm/setup.h>
27 #include <asm/amigappc.h>
30 #include <asm/cputable.h>
31 #include <asm/bootx.h>
32 #include <asm/btext.h>
33 #include <asm/machdep.h>
34 #include <asm/uaccess.h>
35 #include <asm/system.h>
36 #include <asm/pmac_feature.h>
37 #include <asm/sections.h>
38 #include <asm/nvram.h>
41 #include <asm/serial.h>
48 #if defined CONFIG_KGDB
52 extern void bootx_init(unsigned long r4
, unsigned long phys
);
54 struct ide_machdep_calls ppc_ide_md
;
57 EXPORT_SYMBOL_GPL(boot_cpuid
);
60 unsigned long ISA_DMA_THRESHOLD
;
61 unsigned int DMA_MODE_READ
;
62 unsigned int DMA_MODE_WRITE
;
66 #ifdef CONFIG_PPC_MULTIPLATFORM
68 #endif /* CONFIG_PPC_MULTIPLATFORM */
70 #ifdef CONFIG_MAGIC_SYSRQ
71 unsigned long SYSRQ_KEY
= 0x54;
72 #endif /* CONFIG_MAGIC_SYSRQ */
74 #ifdef CONFIG_VGA_CONSOLE
75 unsigned long vgacon_remap_base
;
79 * These are used in binfmt_elf.c to put aux entries on the stack
80 * for each elf executable being started.
87 * We're called here very early in the boot. We determine the machine
88 * type and call the appropriate low-level setup functions.
89 * -- Cort <cort@fsmlabs.com>
91 * Note that the kernel may be running at an address which is different
92 * from the address that it was linked at, so we must use RELOC/PTRRELOC
93 * to access static data (including strings). -- paulus
95 unsigned long __init
early_init(unsigned long dt_ptr
)
97 unsigned long offset
= reloc_offset();
99 /* First zero the BSS -- use memset_io, some platforms don't have
101 memset_io((void __iomem
*)PTRRELOC(&__bss_start
), 0, _end
- __bss_start
);
104 * Identify the CPU type and fix up code sections
105 * that depend on which cpu we have.
107 identify_cpu(offset
, 0);
108 do_cpu_ftr_fixups(offset
);
110 return KERNELBASE
+ offset
;
115 * Find out what kind of machine we're on and save any data we need
116 * from the early boot process (devtree is copied on pmac by prom_init()).
117 * This is called very early on the boot process, after a minimal
118 * MMU environment has been set up but before MMU_init is called.
120 void __init
machine_init(unsigned long dt_ptr
, unsigned long phys
)
122 /* If btext is enabled, we might have a BAT setup for early display,
123 * thus we do enable some very basic udbg output
125 #ifdef CONFIG_BOOTX_TEXT
126 udbg_putc
= btext_drawchar
;
129 /* Do some early initialization based on the flat device tree */
130 early_init_devtree(__va(dt_ptr
));
135 if (cpu_has_feature(CPU_FTR_CAN_DOZE
) ||
136 cpu_has_feature(CPU_FTR_CAN_NAP
))
137 ppc_md
.power_save
= ppc6xx_idle
;
141 ppc_md
.progress("id mach(): done", 0x200);
144 #ifdef CONFIG_BOOKE_WDT
145 /* Checks wdt=x and wdt_period=xx command-line option */
146 int __init
early_parse_wdt(char *p
)
148 if (p
&& strncmp(p
, "0", 1) != 0)
149 booke_wdt_enabled
= 1;
153 early_param("wdt", early_parse_wdt
);
155 int __init
early_parse_wdt_period (char *p
)
158 booke_wdt_period
= simple_strtoul(p
, NULL
, 0);
162 early_param("wdt_period", early_parse_wdt_period
);
163 #endif /* CONFIG_BOOKE_WDT */
165 /* Checks "l2cr=xxxx" command-line option */
166 int __init
ppc_setup_l2cr(char *str
)
168 if (cpu_has_feature(CPU_FTR_L2CR
)) {
169 unsigned long val
= simple_strtoul(str
, NULL
, 0);
170 printk(KERN_INFO
"l2cr set to %lx\n", val
);
171 _set_L2CR(0); /* force invalidate by disable cache */
172 _set_L2CR(val
); /* and enable it */
176 __setup("l2cr=", ppc_setup_l2cr
);
178 #ifdef CONFIG_GENERIC_NVRAM
180 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
181 unsigned char nvram_read_byte(int addr
)
183 if (ppc_md
.nvram_read_val
)
184 return ppc_md
.nvram_read_val(addr
);
187 EXPORT_SYMBOL(nvram_read_byte
);
189 void nvram_write_byte(unsigned char val
, int addr
)
191 if (ppc_md
.nvram_write_val
)
192 ppc_md
.nvram_write_val(addr
, val
);
194 EXPORT_SYMBOL(nvram_write_byte
);
196 void nvram_sync(void)
198 if (ppc_md
.nvram_sync
)
201 EXPORT_SYMBOL(nvram_sync
);
203 #endif /* CONFIG_NVRAM */
205 static struct cpu cpu_devices
[NR_CPUS
];
207 int __init
ppc_init(void)
211 /* clear the progress line */
212 if ( ppc_md
.progress
) ppc_md
.progress(" ", 0xffff);
214 /* register CPU devices */
215 for_each_possible_cpu(i
)
216 register_cpu(&cpu_devices
[i
], i
);
218 /* call platform init */
219 if (ppc_md
.init
!= NULL
) {
225 arch_initcall(ppc_init
);
227 /* Warning, IO base is not yet inited */
228 void __init
setup_arch(char **cmdline_p
)
230 *cmdline_p
= cmd_line
;
232 /* so udelay does something sensible, assume <= 1000 bogomips */
233 loops_per_jiffy
= 500000000 / HZ
;
235 unflatten_device_tree();
238 if (ppc_md
.init_early
)
241 find_legacy_serial_ports();
243 smp_setup_cpu_maps();
245 #ifdef CONFIG_XMON_DEFAULT
248 /* Register early console */
249 register_early_udbg_console();
251 #if defined(CONFIG_KGDB)
252 if (ppc_md
.kgdb_map_scc
)
253 ppc_md
.kgdb_map_scc();
255 if (strstr(cmd_line
, "gdb")) {
257 ppc_md
.progress("setup_arch: kgdb breakpoint", 0x4000);
258 printk("kgdb breakpoint activated\n");
264 * Set cache line size based on type of cpu as a default.
265 * Systems with OF can look in the properties on the cpu node(s)
266 * for a possibly more accurate value.
268 if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE
)) {
269 dcache_bsize
= cur_cpu_spec
->dcache_bsize
;
270 icache_bsize
= cur_cpu_spec
->icache_bsize
;
273 ucache_bsize
= dcache_bsize
= icache_bsize
274 = cur_cpu_spec
->dcache_bsize
;
276 /* reboot on panic */
282 init_mm
.start_code
= PAGE_OFFSET
;
283 init_mm
.end_code
= (unsigned long) _etext
;
284 init_mm
.end_data
= (unsigned long) _edata
;
285 init_mm
.brk
= klimit
;
290 /* set up the bootmem stuff with available memory */
292 if ( ppc_md
.progress
) ppc_md
.progress("setup_arch: bootmem", 0x3eab);
294 #ifdef CONFIG_DUMMY_CONSOLE
295 conswitchp
= &dummy_con
;
299 if ( ppc_md
.progress
) ppc_md
.progress("arch: exit", 0x3eab);