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_VGA_CONSOLE
67 unsigned long vgacon_remap_base
;
71 * These are used in binfmt_elf.c to put aux entries on the stack
72 * for each elf executable being started.
79 * We're called here very early in the boot. We determine the machine
80 * type and call the appropriate low-level setup functions.
81 * -- Cort <cort@fsmlabs.com>
83 * Note that the kernel may be running at an address which is different
84 * from the address that it was linked at, so we must use RELOC/PTRRELOC
85 * to access static data (including strings). -- paulus
87 unsigned long __init
early_init(unsigned long dt_ptr
)
89 unsigned long offset
= reloc_offset();
90 struct cpu_spec
*spec
;
92 /* First zero the BSS -- use memset_io, some platforms don't have
94 memset_io((void __iomem
*)PTRRELOC(&__bss_start
), 0, _end
- __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
);
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 /* If btext is enabled, we might have a BAT setup for early display,
119 * thus we do enable some very basic udbg output
121 #ifdef CONFIG_BOOTX_TEXT
122 udbg_putc
= btext_drawchar
;
125 /* Do some early initialization based on the flat device tree */
126 early_init_devtree(__va(dt_ptr
));
131 if (cpu_has_feature(CPU_FTR_CAN_DOZE
) ||
132 cpu_has_feature(CPU_FTR_CAN_NAP
))
133 ppc_md
.power_save
= ppc6xx_idle
;
137 ppc_md
.progress("id mach(): done", 0x200);
140 #ifdef CONFIG_BOOKE_WDT
141 /* Checks wdt=x and wdt_period=xx command-line option */
142 int __init
early_parse_wdt(char *p
)
144 if (p
&& strncmp(p
, "0", 1) != 0)
145 booke_wdt_enabled
= 1;
149 early_param("wdt", early_parse_wdt
);
151 int __init
early_parse_wdt_period (char *p
)
154 booke_wdt_period
= simple_strtoul(p
, NULL
, 0);
158 early_param("wdt_period", early_parse_wdt_period
);
159 #endif /* CONFIG_BOOKE_WDT */
161 /* Checks "l2cr=xxxx" command-line option */
162 int __init
ppc_setup_l2cr(char *str
)
164 if (cpu_has_feature(CPU_FTR_L2CR
)) {
165 unsigned long val
= simple_strtoul(str
, NULL
, 0);
166 printk(KERN_INFO
"l2cr set to %lx\n", val
);
167 _set_L2CR(0); /* force invalidate by disable cache */
168 _set_L2CR(val
); /* and enable it */
172 __setup("l2cr=", ppc_setup_l2cr
);
174 #ifdef CONFIG_GENERIC_NVRAM
176 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
177 unsigned char nvram_read_byte(int addr
)
179 if (ppc_md
.nvram_read_val
)
180 return ppc_md
.nvram_read_val(addr
);
183 EXPORT_SYMBOL(nvram_read_byte
);
185 void nvram_write_byte(unsigned char val
, int addr
)
187 if (ppc_md
.nvram_write_val
)
188 ppc_md
.nvram_write_val(addr
, val
);
190 EXPORT_SYMBOL(nvram_write_byte
);
192 void nvram_sync(void)
194 if (ppc_md
.nvram_sync
)
197 EXPORT_SYMBOL(nvram_sync
);
199 #endif /* CONFIG_NVRAM */
201 static struct cpu cpu_devices
[NR_CPUS
];
203 int __init
ppc_init(void)
207 /* clear the progress line */
208 if ( ppc_md
.progress
) ppc_md
.progress(" ", 0xffff);
210 /* register CPU devices */
211 for_each_possible_cpu(i
)
212 register_cpu(&cpu_devices
[i
], i
);
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 if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE
)) {
264 dcache_bsize
= cur_cpu_spec
->dcache_bsize
;
265 icache_bsize
= cur_cpu_spec
->icache_bsize
;
268 ucache_bsize
= dcache_bsize
= icache_bsize
269 = cur_cpu_spec
->dcache_bsize
;
271 /* reboot on panic */
277 init_mm
.start_code
= PAGE_OFFSET
;
278 init_mm
.end_code
= (unsigned long) _etext
;
279 init_mm
.end_data
= (unsigned long) _edata
;
280 init_mm
.brk
= klimit
;
282 /* set up the bootmem stuff with available memory */
284 if ( ppc_md
.progress
) ppc_md
.progress("setup_arch: bootmem", 0x3eab);
286 #ifdef CONFIG_DUMMY_CONSOLE
287 conswitchp
= &dummy_con
;
291 if ( ppc_md
.progress
) ppc_md
.progress("arch: exit", 0x3eab);