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 boot_infos_t
*boot_infos
;
55 struct ide_machdep_calls ppc_ide_md
;
58 EXPORT_SYMBOL_GPL(boot_cpuid
);
61 unsigned long ISA_DMA_THRESHOLD
;
62 unsigned int DMA_MODE_READ
;
63 unsigned int DMA_MODE_WRITE
;
67 #ifdef CONFIG_PPC_MULTIPLATFORM
69 #endif /* CONFIG_PPC_MULTIPLATFORM */
71 #ifdef CONFIG_MAGIC_SYSRQ
72 unsigned long SYSRQ_KEY
= 0x54;
73 #endif /* CONFIG_MAGIC_SYSRQ */
75 #ifdef CONFIG_VGA_CONSOLE
76 unsigned long vgacon_remap_base
;
80 * These are used in binfmt_elf.c to put aux entries on the stack
81 * for each elf executable being started.
88 * We're called here very early in the boot. We determine the machine
89 * type and call the appropriate low-level setup functions.
90 * -- Cort <cort@fsmlabs.com>
92 * Note that the kernel may be running at an address which is different
93 * from the address that it was linked at, so we must use RELOC/PTRRELOC
94 * to access static data (including strings). -- paulus
96 unsigned long __init
early_init(unsigned long dt_ptr
)
98 unsigned long offset
= reloc_offset();
100 /* First zero the BSS -- use memset_io, some platforms don't have
102 memset_io((void __iomem
*)PTRRELOC(&__bss_start
), 0, _end
- __bss_start
);
105 * Identify the CPU type and fix up code sections
106 * that depend on which cpu we have.
108 identify_cpu(offset
, 0);
109 do_cpu_ftr_fixups(offset
);
111 return KERNELBASE
+ offset
;
116 * Find out what kind of machine we're on and save any data we need
117 * from the early boot process (devtree is copied on pmac by prom_init()).
118 * This is called very early on the boot process, after a minimal
119 * MMU environment has been set up but before MMU_init is called.
121 void __init
machine_init(unsigned long dt_ptr
, unsigned long phys
)
123 /* If btext is enabled, we might have a BAT setup for early display,
124 * thus we do enable some very basic udbg output
126 #ifdef CONFIG_BOOTX_TEXT
127 udbg_putc
= btext_drawchar
;
130 /* Do some early initialization based on the flat device tree */
131 early_init_devtree(__va(dt_ptr
));
136 if (cpu_has_feature(CPU_FTR_CAN_DOZE
) ||
137 cpu_has_feature(CPU_FTR_CAN_NAP
))
138 ppc_md
.power_save
= ppc6xx_idle
;
142 ppc_md
.progress("id mach(): done", 0x200);
145 #ifdef CONFIG_BOOKE_WDT
146 /* Checks wdt=x and wdt_period=xx command-line option */
147 int __init
early_parse_wdt(char *p
)
149 if (p
&& strncmp(p
, "0", 1) != 0)
150 booke_wdt_enabled
= 1;
154 early_param("wdt", early_parse_wdt
);
156 int __init
early_parse_wdt_period (char *p
)
159 booke_wdt_period
= simple_strtoul(p
, NULL
, 0);
163 early_param("wdt_period", early_parse_wdt_period
);
164 #endif /* CONFIG_BOOKE_WDT */
166 /* Checks "l2cr=xxxx" command-line option */
167 int __init
ppc_setup_l2cr(char *str
)
169 if (cpu_has_feature(CPU_FTR_L2CR
)) {
170 unsigned long val
= simple_strtoul(str
, NULL
, 0);
171 printk(KERN_INFO
"l2cr set to %lx\n", val
);
172 _set_L2CR(0); /* force invalidate by disable cache */
173 _set_L2CR(val
); /* and enable it */
177 __setup("l2cr=", ppc_setup_l2cr
);
179 #ifdef CONFIG_GENERIC_NVRAM
181 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
182 unsigned char nvram_read_byte(int addr
)
184 if (ppc_md
.nvram_read_val
)
185 return ppc_md
.nvram_read_val(addr
);
188 EXPORT_SYMBOL(nvram_read_byte
);
190 void nvram_write_byte(unsigned char val
, int addr
)
192 if (ppc_md
.nvram_write_val
)
193 ppc_md
.nvram_write_val(addr
, val
);
195 EXPORT_SYMBOL(nvram_write_byte
);
197 void nvram_sync(void)
199 if (ppc_md
.nvram_sync
)
202 EXPORT_SYMBOL(nvram_sync
);
204 #endif /* CONFIG_NVRAM */
206 static struct cpu cpu_devices
[NR_CPUS
];
208 int __init
ppc_init(void)
212 /* clear the progress line */
213 if ( ppc_md
.progress
) ppc_md
.progress(" ", 0xffff);
215 /* register CPU devices */
216 for_each_possible_cpu(i
)
217 register_cpu(&cpu_devices
[i
], i
);
219 /* call platform init */
220 if (ppc_md
.init
!= NULL
) {
226 arch_initcall(ppc_init
);
228 /* Warning, IO base is not yet inited */
229 void __init
setup_arch(char **cmdline_p
)
231 *cmdline_p
= cmd_line
;
233 /* so udelay does something sensible, assume <= 1000 bogomips */
234 loops_per_jiffy
= 500000000 / HZ
;
236 unflatten_device_tree();
239 if (ppc_md
.init_early
)
242 find_legacy_serial_ports();
243 finish_device_tree();
245 smp_setup_cpu_maps();
247 #ifdef CONFIG_XMON_DEFAULT
250 /* Register early console */
251 register_early_udbg_console();
253 #if defined(CONFIG_KGDB)
254 if (ppc_md
.kgdb_map_scc
)
255 ppc_md
.kgdb_map_scc();
257 if (strstr(cmd_line
, "gdb")) {
259 ppc_md
.progress("setup_arch: kgdb breakpoint", 0x4000);
260 printk("kgdb breakpoint activated\n");
266 * Set cache line size based on type of cpu as a default.
267 * Systems with OF can look in the properties on the cpu node(s)
268 * for a possibly more accurate value.
270 if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE
)) {
271 dcache_bsize
= cur_cpu_spec
->dcache_bsize
;
272 icache_bsize
= cur_cpu_spec
->icache_bsize
;
275 ucache_bsize
= dcache_bsize
= icache_bsize
276 = cur_cpu_spec
->dcache_bsize
;
278 /* reboot on panic */
284 init_mm
.start_code
= PAGE_OFFSET
;
285 init_mm
.end_code
= (unsigned long) _etext
;
286 init_mm
.end_data
= (unsigned long) _edata
;
287 init_mm
.brk
= klimit
;
292 /* set up the bootmem stuff with available memory */
294 if ( ppc_md
.progress
) ppc_md
.progress("setup_arch: bootmem", 0x3eab);
296 #ifdef CONFIG_DUMMY_CONSOLE
297 conswitchp
= &dummy_con
;
301 if ( ppc_md
.progress
) ppc_md
.progress("arch: exit", 0x3eab);