source: src/linux/laguna/linux-3.1/arch/powerpc/kernel/setup_32.c @ 17814

Last change on this file since 17814 was 17814, checked in by BrainSlayer, 19 months ago

linux 3.1 works now on laguna
File size: 8.2 KB
Line 
1/*
2 * Common prep/pmac/chrp boot and setup code.
3 */
4
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/tty.h>
14#include <linux/bootmem.h>
15#include <linux/seq_file.h>
16#include <linux/root_dev.h>
17#include <linux/cpu.h>
18#include <linux/console.h>
19#include <linux/memblock.h>
20
21#include <asm/io.h>
22#include <asm/prom.h>
23#include <asm/processor.h>
24#include <asm/pgtable.h>
25#include <asm/setup.h>
26#include <asm/smp.h>
27#include <asm/elf.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>
37#include <asm/xmon.h>
38#include <asm/time.h>
39#include <asm/serial.h>
40#include <asm/udbg.h>
41#include <asm/mmu_context.h>
42
43#include "setup.h"
44
45#define DBG(fmt...)
46
47extern void bootx_init(unsigned long r4, unsigned long phys);
48
49int boot_cpuid = -1;
50EXPORT_SYMBOL_GPL(boot_cpuid);
51int boot_cpuid_phys;
52EXPORT_SYMBOL_GPL(boot_cpuid_phys);
53
54int smp_hw_index[NR_CPUS];
55
56unsigned long ISA_DMA_THRESHOLD;
57unsigned int DMA_MODE_READ;
58unsigned int DMA_MODE_WRITE;
59
60#ifdef CONFIG_VGA_CONSOLE
61unsigned long vgacon_remap_base;
62EXPORT_SYMBOL(vgacon_remap_base);
63#endif
64
65/*
66 * These are used in binfmt_elf.c to put aux entries on the stack
67 * for each elf executable being started.
68 */
69int dcache_bsize;
70int icache_bsize;
71int ucache_bsize;
72
73/*
74 * We're called here very early in the boot.  We determine the machine
75 * type and call the appropriate low-level setup functions.
76 *  -- Cort <cort@fsmlabs.com>
77 *
78 * Note that the kernel may be running at an address which is different
79 * from the address that it was linked at, so we must use RELOC/PTRRELOC
80 * to access static data (including strings).  -- paulus
81 */
82notrace unsigned long __init early_init(unsigned long dt_ptr)
83{
84        unsigned long offset = reloc_offset();
85        struct cpu_spec *spec;
86
87        /* First zero the BSS -- use memset_io, some platforms don't have
88         * caches on yet */
89        memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
90                        __bss_stop - __bss_start);
91
92        /*
93         * Identify the CPU type and fix up code sections
94         * that depend on which cpu we have.
95         */
96        spec = identify_cpu(offset, mfspr(SPRN_PVR));
97
98        do_feature_fixups(spec->cpu_features,
99                          PTRRELOC(&__start___ftr_fixup),
100                          PTRRELOC(&__stop___ftr_fixup));
101
102        do_feature_fixups(spec->mmu_features,
103                          PTRRELOC(&__start___mmu_ftr_fixup),
104                          PTRRELOC(&__stop___mmu_ftr_fixup));
105
106        do_lwsync_fixups(spec->cpu_features,
107                         PTRRELOC(&__start___lwsync_fixup),
108                         PTRRELOC(&__stop___lwsync_fixup));
109
110        return KERNELBASE + offset;
111}
112
113
114/*
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.
119 */
120notrace void __init machine_init(unsigned long dt_ptr)
121{
122        lockdep_init();
123
124        /* Enable early debugging if any specified (see udbg.h) */
125        udbg_early_init();
126
127        /* Do some early initialization based on the flat device tree */
128        early_init_devtree(__va(dt_ptr));
129
130        early_init_mmu();
131
132        probe_machine();
133
134        setup_kdump_trampoline();
135
136#ifdef CONFIG_6xx
137        if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
138            cpu_has_feature(CPU_FTR_CAN_NAP))
139                ppc_md.power_save = ppc6xx_idle;
140#endif
141
142#ifdef CONFIG_E500
143        if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
144            cpu_has_feature(CPU_FTR_CAN_NAP))
145                ppc_md.power_save = e500_idle;
146#endif
147        if (ppc_md.progress)
148                ppc_md.progress("id mach(): done", 0x200);
149}
150
151#ifdef CONFIG_BOOKE_WDT
152/* Checks wdt=x and wdt_period=xx command-line option */
153notrace int __init early_parse_wdt(char *p)
154{
155        if (p && strncmp(p, "0", 1) != 0)
156               booke_wdt_enabled = 1;
157
158        return 0;
159}
160early_param("wdt", early_parse_wdt);
161
162int __init early_parse_wdt_period (char *p)
163{
164        if (p)
165                booke_wdt_period = simple_strtoul(p, NULL, 0);
166
167        return 0;
168}
169early_param("wdt_period", early_parse_wdt_period);
170#endif  /* CONFIG_BOOKE_WDT */
171
172/* Checks "l2cr=xxxx" command-line option */
173int __init ppc_setup_l2cr(char *str)
174{
175        if (cpu_has_feature(CPU_FTR_L2CR)) {
176                unsigned long val = simple_strtoul(str, NULL, 0);
177                printk(KERN_INFO "l2cr set to %lx\n", val);
178                _set_L2CR(0);           /* force invalidate by disable cache */
179                _set_L2CR(val);         /* and enable it */
180        }
181        return 1;
182}
183__setup("l2cr=", ppc_setup_l2cr);
184
185/* Checks "l3cr=xxxx" command-line option */
186int __init ppc_setup_l3cr(char *str)
187{
188        if (cpu_has_feature(CPU_FTR_L3CR)) {
189                unsigned long val = simple_strtoul(str, NULL, 0);
190                printk(KERN_INFO "l3cr set to %lx\n", val);
191                _set_L3CR(val);         /* and enable it */
192        }
193        return 1;
194}
195__setup("l3cr=", ppc_setup_l3cr);
196
197#ifdef CONFIG_GENERIC_NVRAM
198
199/* Generic nvram hooks used by drivers/char/gen_nvram.c */
200unsigned char nvram_read_byte(int addr)
201{
202        if (ppc_md.nvram_read_val)
203                return ppc_md.nvram_read_val(addr);
204        return 0xff;
205}
206EXPORT_SYMBOL(nvram_read_byte);
207
208void nvram_write_byte(unsigned char val, int addr)
209{
210        if (ppc_md.nvram_write_val)
211                ppc_md.nvram_write_val(addr, val);
212}
213EXPORT_SYMBOL(nvram_write_byte);
214
215ssize_t nvram_get_size(void)
216{
217        if (ppc_md.nvram_size)
218                return ppc_md.nvram_size();
219        return -1;
220}
221EXPORT_SYMBOL(nvram_get_size);
222
223void nvram_sync(void)
224{
225        if (ppc_md.nvram_sync)
226                ppc_md.nvram_sync();
227}
228EXPORT_SYMBOL(nvram_sync);
229
230#endif /* CONFIG_NVRAM */
231
232int __init ppc_init(void)
233{
234        /* clear the progress line */
235        if (ppc_md.progress)
236                ppc_md.progress("             ", 0xffff);
237
238        /* call platform init */
239        if (ppc_md.init != NULL) {
240                ppc_md.init();
241        }
242        return 0;
243}
244
245arch_initcall(ppc_init);
246
247static void __init irqstack_early_init(void)
248{
249        unsigned int i;
250
251        /* interrupt stacks must be in lowmem, we get that for free on ppc32
252         * as the memblock is limited to lowmem by default */
253        for_each_possible_cpu(i) {
254                softirq_ctx[i] = (struct thread_info *)
255                        __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
256                hardirq_ctx[i] = (struct thread_info *)
257                        __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
258        }
259}
260
261#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
262static void __init exc_lvl_early_init(void)
263{
264        unsigned int i, hw_cpu;
265
266        /* interrupt stacks must be in lowmem, we get that for free on ppc32
267         * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
268        for_each_possible_cpu(i) {
269                hw_cpu = get_hard_smp_processor_id(i);
270                critirq_ctx[hw_cpu] = (struct thread_info *)
271                        __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
272#ifdef CONFIG_BOOKE
273                dbgirq_ctx[hw_cpu] = (struct thread_info *)
274                        __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
275                mcheckirq_ctx[hw_cpu] = (struct thread_info *)
276                        __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
277#endif
278        }
279}
280#else
281#define exc_lvl_early_init()
282#endif
283
284/* Warning, IO base is not yet inited */
285void __init setup_arch(char **cmdline_p)
286{
287        *cmdline_p = cmd_line;
288
289        /* so udelay does something sensible, assume <= 1000 bogomips */
290        loops_per_jiffy = 500000000 / HZ;
291
292        unflatten_device_tree();
293        check_for_initrd();
294
295        if (ppc_md.init_early)
296                ppc_md.init_early();
297
298        find_legacy_serial_ports();
299
300        smp_setup_cpu_maps();
301
302        /* Register early console */
303        register_early_udbg_console();
304
305        xmon_setup();
306
307        /*
308         * Set cache line size based on type of cpu as a default.
309         * Systems with OF can look in the properties on the cpu node(s)
310         * for a possibly more accurate value.
311         */
312        dcache_bsize = cur_cpu_spec->dcache_bsize;
313        icache_bsize = cur_cpu_spec->icache_bsize;
314        ucache_bsize = 0;
315        if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
316                ucache_bsize = icache_bsize = dcache_bsize;
317
318        /* reboot on panic */
319        panic_timeout = 180;
320
321        if (ppc_md.panic)
322                setup_panic();
323
324        init_mm.start_code = (unsigned long)_stext;
325        init_mm.end_code = (unsigned long) _etext;
326        init_mm.end_data = (unsigned long) _edata;
327        init_mm.brk = klimit;
328
329        exc_lvl_early_init();
330
331        irqstack_early_init();
332
333        /* set up the bootmem stuff with available memory */
334        do_init_bootmem();
335        if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
336
337#ifdef CONFIG_DUMMY_CONSOLE
338        conswitchp = &dummy_con;
339#endif
340
341        if (ppc_md.setup_arch)
342                ppc_md.setup_arch();
343        if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
344
345        paging_init();
346
347        /* Initialize the MMU context management stuff */
348        mmu_context_init();
349
350}
Note: See TracBrowser for help on using the repository browser.