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>
23 #include <asm/processor.h>
24 #include <asm/pgtable.h>
25 #include <asm/setup.h>
28 #include <asm/cputable.h>
29 #include <asm/bootx.h>
30 #include <asm/btext.h>
31 #include <asm/machdep.h>
32 #include <asm/uaccess.h>
33 #include <asm/system.h>
34 #include <asm/pmac_feature.h>
35 #include <asm/sections.h>
36 #include <asm/nvram.h>
39 #include <asm/serial.h>
46 #if defined CONFIG_KGDB
50 extern void bootx_init(unsigned long r4
, unsigned long phys
);
52 struct ide_machdep_calls ppc_ide_md
;
55 EXPORT_SYMBOL_GPL(boot_cpuid
);
58 unsigned long ISA_DMA_THRESHOLD
;
59 unsigned int DMA_MODE_READ
;
60 unsigned int DMA_MODE_WRITE
;
64 #ifdef CONFIG_VGA_CONSOLE
65 unsigned long vgacon_remap_base
;
66 EXPORT_SYMBOL(vgacon_remap_base
);
70 * These are used in binfmt_elf.c to put aux entries on the stack
71 * for each elf executable being started.
78 * We're called here very early in the boot. We determine the machine
79 * type and call the appropriate low-level setup functions.
80 * -- Cort <cort@fsmlabs.com>
82 * Note that the kernel may be running at an address which is different
83 * from the address that it was linked at, so we must use RELOC/PTRRELOC
84 * to access static data (including strings). -- paulus
86 unsigned long __init
early_init(unsigned long dt_ptr
)
88 unsigned long offset
= reloc_offset();
89 struct cpu_spec
*spec
;
91 /* First zero the BSS -- use memset_io, some platforms don't have
93 memset_io((void __iomem
*)PTRRELOC(&__bss_start
), 0,
94 __bss_stop
- __bss_start
);
97 * Identify the CPU type and fix up code sections
98 * that depend on which cpu we have.
100 spec
= identify_cpu(offset
, mfspr(SPRN_PVR
));
102 do_feature_fixups(spec
->cpu_features
,
103 PTRRELOC(&__start___ftr_fixup
),
104 PTRRELOC(&__stop___ftr_fixup
));
106 return KERNELBASE
+ offset
;
111 * Find out what kind of machine we're on and save any data we need
112 * from the early boot process (devtree is copied on pmac by prom_init()).
113 * This is called very early on the boot process, after a minimal
114 * MMU environment has been set up but before MMU_init is called.
116 void __init
machine_init(unsigned long dt_ptr
, unsigned long phys
)
118 /* Enable early debugging if any specified (see udbg.h) */
121 /* Do some early initialization based on the flat device tree */
122 early_init_devtree(__va(dt_ptr
));
127 if (cpu_has_feature(CPU_FTR_CAN_DOZE
) ||
128 cpu_has_feature(CPU_FTR_CAN_NAP
))
129 ppc_md
.power_save
= ppc6xx_idle
;
133 ppc_md
.progress("id mach(): done", 0x200);
136 #ifdef CONFIG_BOOKE_WDT
137 /* Checks wdt=x and wdt_period=xx command-line option */
138 int __init
early_parse_wdt(char *p
)
140 if (p
&& strncmp(p
, "0", 1) != 0)
141 booke_wdt_enabled
= 1;
145 early_param("wdt", early_parse_wdt
);
147 int __init
early_parse_wdt_period (char *p
)
150 booke_wdt_period
= simple_strtoul(p
, NULL
, 0);
154 early_param("wdt_period", early_parse_wdt_period
);
155 #endif /* CONFIG_BOOKE_WDT */
157 /* Checks "l2cr=xxxx" command-line option */
158 int __init
ppc_setup_l2cr(char *str
)
160 if (cpu_has_feature(CPU_FTR_L2CR
)) {
161 unsigned long val
= simple_strtoul(str
, NULL
, 0);
162 printk(KERN_INFO
"l2cr set to %lx\n", val
);
163 _set_L2CR(0); /* force invalidate by disable cache */
164 _set_L2CR(val
); /* and enable it */
168 __setup("l2cr=", ppc_setup_l2cr
);
170 #ifdef CONFIG_GENERIC_NVRAM
172 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
173 unsigned char nvram_read_byte(int addr
)
175 if (ppc_md
.nvram_read_val
)
176 return ppc_md
.nvram_read_val(addr
);
179 EXPORT_SYMBOL(nvram_read_byte
);
181 void nvram_write_byte(unsigned char val
, int addr
)
183 if (ppc_md
.nvram_write_val
)
184 ppc_md
.nvram_write_val(addr
, val
);
186 EXPORT_SYMBOL(nvram_write_byte
);
188 void nvram_sync(void)
190 if (ppc_md
.nvram_sync
)
193 EXPORT_SYMBOL(nvram_sync
);
195 #endif /* CONFIG_NVRAM */
197 static DEFINE_PER_CPU(struct cpu
, cpu_devices
);
199 int __init
ppc_init(void)
203 /* clear the progress line */
205 ppc_md
.progress(" ", 0xffff);
207 /* register CPU devices */
208 for_each_possible_cpu(cpu
) {
209 struct cpu
*c
= &per_cpu(cpu_devices
, cpu
);
211 register_cpu(c
, cpu
);
214 /* call platform init */
215 if (ppc_md
.init
!= NULL
) {
221 arch_initcall(ppc_init
);
223 /* Warning, IO base is not yet inited */
224 void __init
setup_arch(char **cmdline_p
)
226 *cmdline_p
= cmd_line
;
228 /* so udelay does something sensible, assume <= 1000 bogomips */
229 loops_per_jiffy
= 500000000 / HZ
;
231 unflatten_device_tree();
234 if (ppc_md
.init_early
)
237 find_legacy_serial_ports();
239 smp_setup_cpu_maps();
241 /* Register early console */
242 register_early_udbg_console();
246 #if defined(CONFIG_KGDB)
247 if (ppc_md
.kgdb_map_scc
)
248 ppc_md
.kgdb_map_scc();
250 if (strstr(cmd_line
, "gdb")) {
252 ppc_md
.progress("setup_arch: kgdb breakpoint", 0x4000);
253 printk("kgdb breakpoint activated\n");
259 * Set cache line size based on type of cpu as a default.
260 * Systems with OF can look in the properties on the cpu node(s)
261 * for a possibly more accurate value.
263 dcache_bsize
= cur_cpu_spec
->dcache_bsize
;
264 icache_bsize
= cur_cpu_spec
->icache_bsize
;
266 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE
))
267 ucache_bsize
= icache_bsize
= dcache_bsize
;
269 /* reboot on panic */
275 init_mm
.start_code
= PAGE_OFFSET
;
276 init_mm
.end_code
= (unsigned long) _etext
;
277 init_mm
.end_data
= (unsigned long) _edata
;
278 init_mm
.brk
= klimit
;
280 /* set up the bootmem stuff with available memory */
282 if ( ppc_md
.progress
) ppc_md
.progress("setup_arch: bootmem", 0x3eab);
284 #ifdef CONFIG_DUMMY_CONSOLE
285 conswitchp
= &dummy_con
;
289 if ( ppc_md
.progress
) ppc_md
.progress("arch: exit", 0x3eab);