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Linux/arch/unicore32/kernel/setup.c

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  1 /*
  2  * linux/arch/unicore32/kernel/setup.c
  3  *
  4  * Code specific to PKUnity SoC and UniCore ISA
  5  *
  6  * Copyright (C) 2001-2010 GUAN Xue-tao
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  */
 12 #include <linux/module.h>
 13 #include <linux/kernel.h>
 14 #include <linux/stddef.h>
 15 #include <linux/ioport.h>
 16 #include <linux/delay.h>
 17 #include <linux/utsname.h>
 18 #include <linux/initrd.h>
 19 #include <linux/console.h>
 20 #include <linux/bootmem.h>
 21 #include <linux/seq_file.h>
 22 #include <linux/screen_info.h>
 23 #include <linux/init.h>
 24 #include <linux/root_dev.h>
 25 #include <linux/cpu.h>
 26 #include <linux/interrupt.h>
 27 #include <linux/smp.h>
 28 #include <linux/fs.h>
 29 #include <linux/proc_fs.h>
 30 #include <linux/memblock.h>
 31 #include <linux/elf.h>
 32 #include <linux/io.h>
 33 
 34 #include <asm/cputype.h>
 35 #include <asm/sections.h>
 36 #include <asm/setup.h>
 37 #include <asm/cacheflush.h>
 38 #include <asm/tlbflush.h>
 39 #include <asm/traps.h>
 40 #include <asm/memblock.h>
 41 
 42 #include "setup.h"
 43 
 44 #ifndef MEM_SIZE
 45 #define MEM_SIZE        (16*1024*1024)
 46 #endif
 47 
 48 struct stack {
 49         u32 irq[3];
 50         u32 abt[3];
 51         u32 und[3];
 52 } ____cacheline_aligned;
 53 
 54 static struct stack stacks[NR_CPUS];
 55 
 56 char elf_platform[ELF_PLATFORM_SIZE];
 57 EXPORT_SYMBOL(elf_platform);
 58 
 59 static char __initdata cmd_line[COMMAND_LINE_SIZE];
 60 
 61 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 62 
 63 /*
 64  * Standard memory resources
 65  */
 66 static struct resource mem_res[] = {
 67         {
 68                 .name = "Kernel code",
 69                 .start = 0,
 70                 .end = 0,
 71                 .flags = IORESOURCE_MEM
 72         },
 73         {
 74                 .name = "Kernel data",
 75                 .start = 0,
 76                 .end = 0,
 77                 .flags = IORESOURCE_MEM
 78         }
 79 };
 80 
 81 #define kernel_code mem_res[0]
 82 #define kernel_data mem_res[1]
 83 
 84 /*
 85  * These functions re-use the assembly code in head.S, which
 86  * already provide the required functionality.
 87  */
 88 static void __init setup_processor(void)
 89 {
 90         printk(KERN_DEFAULT "CPU: UniCore-II [%08x] revision %d, cr=%08lx\n",
 91                uc32_cpuid, (int)(uc32_cpuid >> 16) & 15, cr_alignment);
 92 
 93         sprintf(init_utsname()->machine, "puv3");
 94         sprintf(elf_platform, "ucv2");
 95 }
 96 
 97 /*
 98  * cpu_init - initialise one CPU.
 99  *
100  * cpu_init sets up the per-CPU stacks.
101  */
102 void cpu_init(void)
103 {
104         unsigned int cpu = smp_processor_id();
105         struct stack *stk = &stacks[cpu];
106 
107         /*
108          * setup stacks for re-entrant exception handlers
109          */
110         __asm__ (
111         "mov.a  asr, %1\n\t"
112         "add    sp, %0, %2\n\t"
113         "mov.a  asr, %3\n\t"
114         "add    sp, %0, %4\n\t"
115         "mov.a  asr, %5\n\t"
116         "add    sp, %0, %6\n\t"
117         "mov.a  asr, %7"
118             :
119             : "r" (stk),
120               "r" (PSR_R_BIT | PSR_I_BIT | INTR_MODE),
121               "I" (offsetof(struct stack, irq[0])),
122               "r" (PSR_R_BIT | PSR_I_BIT | ABRT_MODE),
123               "I" (offsetof(struct stack, abt[0])),
124               "r" (PSR_R_BIT | PSR_I_BIT | EXTN_MODE),
125               "I" (offsetof(struct stack, und[0])),
126               "r" (PSR_R_BIT | PSR_I_BIT | PRIV_MODE)
127         : "r30", "cc");
128 }
129 
130 static int __init uc32_add_memory(unsigned long start, unsigned long size)
131 {
132         struct membank *bank = &meminfo.bank[meminfo.nr_banks];
133 
134         if (meminfo.nr_banks >= NR_BANKS) {
135                 printk(KERN_CRIT "NR_BANKS too low, "
136                         "ignoring memory at %#lx\n", start);
137                 return -EINVAL;
138         }
139 
140         /*
141          * Ensure that start/size are aligned to a page boundary.
142          * Size is appropriately rounded down, start is rounded up.
143          */
144         size -= start & ~PAGE_MASK;
145 
146         bank->start = PAGE_ALIGN(start);
147         bank->size  = size & PAGE_MASK;
148 
149         /*
150          * Check whether this memory region has non-zero size or
151          * invalid node number.
152          */
153         if (bank->size == 0)
154                 return -EINVAL;
155 
156         meminfo.nr_banks++;
157         return 0;
158 }
159 
160 /*
161  * Pick out the memory size.  We look for mem=size@start,
162  * where start and size are "size[KkMm]"
163  */
164 static int __init early_mem(char *p)
165 {
166         static int usermem __initdata = 1;
167         unsigned long size, start;
168         char *endp;
169 
170         /*
171          * If the user specifies memory size, we
172          * blow away any automatically generated
173          * size.
174          */
175         if (usermem) {
176                 usermem = 0;
177                 meminfo.nr_banks = 0;
178         }
179 
180         start = PHYS_OFFSET;
181         size  = memparse(p, &endp);
182         if (*endp == '@')
183                 start = memparse(endp + 1, NULL);
184 
185         uc32_add_memory(start, size);
186 
187         return 0;
188 }
189 early_param("mem", early_mem);
190 
191 static void __init
192 request_standard_resources(struct meminfo *mi)
193 {
194         struct resource *res;
195         int i;
196 
197         kernel_code.start   = virt_to_phys(_stext);
198         kernel_code.end     = virt_to_phys(_etext - 1);
199         kernel_data.start   = virt_to_phys(_sdata);
200         kernel_data.end     = virt_to_phys(_end - 1);
201 
202         for (i = 0; i < mi->nr_banks; i++) {
203                 if (mi->bank[i].size == 0)
204                         continue;
205 
206                 res = alloc_bootmem_low(sizeof(*res));
207                 res->name  = "System RAM";
208                 res->start = mi->bank[i].start;
209                 res->end   = mi->bank[i].start + mi->bank[i].size - 1;
210                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
211 
212                 request_resource(&iomem_resource, res);
213 
214                 if (kernel_code.start >= res->start &&
215                     kernel_code.end <= res->end)
216                         request_resource(res, &kernel_code);
217                 if (kernel_data.start >= res->start &&
218                     kernel_data.end <= res->end)
219                         request_resource(res, &kernel_data);
220         }
221 }
222 
223 static void (*init_machine)(void) __initdata;
224 
225 static int __init customize_machine(void)
226 {
227         /* customizes platform devices, or adds new ones */
228         if (init_machine)
229                 init_machine();
230         return 0;
231 }
232 arch_initcall(customize_machine);
233 
234 void __init setup_arch(char **cmdline_p)
235 {
236         char *from = default_command_line;
237 
238         setup_processor();
239 
240         init_mm.start_code = (unsigned long) _stext;
241         init_mm.end_code   = (unsigned long) _etext;
242         init_mm.end_data   = (unsigned long) _edata;
243         init_mm.brk        = (unsigned long) _end;
244 
245         /* parse_early_param needs a boot_command_line */
246         strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
247 
248         /* populate cmd_line too for later use, preserving boot_command_line */
249         strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
250         *cmdline_p = cmd_line;
251 
252         parse_early_param();
253 
254         uc32_memblock_init(&meminfo);
255 
256         paging_init();
257         request_standard_resources(&meminfo);
258 
259         cpu_init();
260 
261         /*
262          * Set up various architecture-specific pointers
263          */
264         init_machine = puv3_core_init;
265 
266 #ifdef CONFIG_VT
267 #if defined(CONFIG_VGA_CONSOLE)
268         conswitchp = &vga_con;
269 #elif defined(CONFIG_DUMMY_CONSOLE)
270         conswitchp = &dummy_con;
271 #endif
272 #endif
273         early_trap_init();
274 }
275 
276 static struct cpu cpuinfo_unicore;
277 
278 static int __init topology_init(void)
279 {
280         int i;
281 
282         for_each_possible_cpu(i)
283                 register_cpu(&cpuinfo_unicore, i);
284 
285         return 0;
286 }
287 subsys_initcall(topology_init);
288 
289 #ifdef CONFIG_HAVE_PROC_CPU
290 static int __init proc_cpu_init(void)
291 {
292         struct proc_dir_entry *res;
293 
294         res = proc_mkdir("cpu", NULL);
295         if (!res)
296                 return -ENOMEM;
297         return 0;
298 }
299 fs_initcall(proc_cpu_init);
300 #endif
301 
302 static int c_show(struct seq_file *m, void *v)
303 {
304         seq_printf(m, "Processor\t: UniCore-II rev %d (%s)\n",
305                    (int)(uc32_cpuid >> 16) & 15, elf_platform);
306 
307         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
308                    loops_per_jiffy / (500000/HZ),
309                    (loops_per_jiffy / (5000/HZ)) % 100);
310 
311         /* dump out the processor features */
312         seq_puts(m, "Features\t: CMOV UC-F64");
313 
314         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", uc32_cpuid >> 24);
315         seq_printf(m, "CPU architecture: 2\n");
316         seq_printf(m, "CPU revision\t: %d\n", (uc32_cpuid >> 16) & 15);
317 
318         seq_printf(m, "Cache type\t: write-back\n"
319                         "Cache clean\t: cp0 c5 ops\n"
320                         "Cache lockdown\t: not support\n"
321                         "Cache format\t: Harvard\n");
322 
323         seq_puts(m, "\n");
324 
325         seq_printf(m, "Hardware\t: PKUnity v3\n");
326 
327         return 0;
328 }
329 
330 static void *c_start(struct seq_file *m, loff_t *pos)
331 {
332         return *pos < 1 ? (void *)1 : NULL;
333 }
334 
335 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
336 {
337         ++*pos;
338         return NULL;
339 }
340 
341 static void c_stop(struct seq_file *m, void *v)
342 {
343 }
344 
345 const struct seq_operations cpuinfo_op = {
346         .start  = c_start,
347         .next   = c_next,
348         .stop   = c_stop,
349         .show   = c_show
350 };
351 

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