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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 #ifdef CONFIG_VGA_CONSOLE
 57 struct screen_info screen_info;
 58 #endif
 59 
 60 char elf_platform[ELF_PLATFORM_SIZE];
 61 EXPORT_SYMBOL(elf_platform);
 62 
 63 static char __initdata cmd_line[COMMAND_LINE_SIZE];
 64 
 65 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 66 
 67 /*
 68  * Standard memory resources
 69  */
 70 static struct resource mem_res[] = {
 71         {
 72                 .name = "Kernel code",
 73                 .start = 0,
 74                 .end = 0,
 75                 .flags = IORESOURCE_MEM
 76         },
 77         {
 78                 .name = "Kernel data",
 79                 .start = 0,
 80                 .end = 0,
 81                 .flags = IORESOURCE_MEM
 82         }
 83 };
 84 
 85 #define kernel_code mem_res[0]
 86 #define kernel_data mem_res[1]
 87 
 88 /*
 89  * These functions re-use the assembly code in head.S, which
 90  * already provide the required functionality.
 91  */
 92 static void __init setup_processor(void)
 93 {
 94         printk(KERN_DEFAULT "CPU: UniCore-II [%08x] revision %d, cr=%08lx\n",
 95                uc32_cpuid, (int)(uc32_cpuid >> 16) & 15, cr_alignment);
 96 
 97         sprintf(init_utsname()->machine, "puv3");
 98         sprintf(elf_platform, "ucv2");
 99 }
100 
101 /*
102  * cpu_init - initialise one CPU.
103  *
104  * cpu_init sets up the per-CPU stacks.
105  */
106 void cpu_init(void)
107 {
108         unsigned int cpu = smp_processor_id();
109         struct stack *stk = &stacks[cpu];
110 
111         /*
112          * setup stacks for re-entrant exception handlers
113          */
114         __asm__ (
115         "mov.a  asr, %1\n\t"
116         "add    sp, %0, %2\n\t"
117         "mov.a  asr, %3\n\t"
118         "add    sp, %0, %4\n\t"
119         "mov.a  asr, %5\n\t"
120         "add    sp, %0, %6\n\t"
121         "mov.a  asr, %7"
122             :
123             : "r" (stk),
124               "r" (PSR_R_BIT | PSR_I_BIT | INTR_MODE),
125               "I" (offsetof(struct stack, irq[0])),
126               "r" (PSR_R_BIT | PSR_I_BIT | ABRT_MODE),
127               "I" (offsetof(struct stack, abt[0])),
128               "r" (PSR_R_BIT | PSR_I_BIT | EXTN_MODE),
129               "I" (offsetof(struct stack, und[0])),
130               "r" (PSR_R_BIT | PSR_I_BIT | PRIV_MODE)
131         : "r30", "cc");
132 }
133 
134 static int __init uc32_add_memory(unsigned long start, unsigned long size)
135 {
136         struct membank *bank = &meminfo.bank[meminfo.nr_banks];
137 
138         if (meminfo.nr_banks >= NR_BANKS) {
139                 printk(KERN_CRIT "NR_BANKS too low, "
140                         "ignoring memory at %#lx\n", start);
141                 return -EINVAL;
142         }
143 
144         /*
145          * Ensure that start/size are aligned to a page boundary.
146          * Size is appropriately rounded down, start is rounded up.
147          */
148         size -= start & ~PAGE_MASK;
149 
150         bank->start = PAGE_ALIGN(start);
151         bank->size  = size & PAGE_MASK;
152 
153         /*
154          * Check whether this memory region has non-zero size or
155          * invalid node number.
156          */
157         if (bank->size == 0)
158                 return -EINVAL;
159 
160         meminfo.nr_banks++;
161         return 0;
162 }
163 
164 /*
165  * Pick out the memory size.  We look for mem=size@start,
166  * where start and size are "size[KkMm]"
167  */
168 static int __init early_mem(char *p)
169 {
170         static int usermem __initdata = 1;
171         unsigned long size, start;
172         char *endp;
173 
174         /*
175          * If the user specifies memory size, we
176          * blow away any automatically generated
177          * size.
178          */
179         if (usermem) {
180                 usermem = 0;
181                 meminfo.nr_banks = 0;
182         }
183 
184         start = PHYS_OFFSET;
185         size  = memparse(p, &endp);
186         if (*endp == '@')
187                 start = memparse(endp + 1, NULL);
188 
189         uc32_add_memory(start, size);
190 
191         return 0;
192 }
193 early_param("mem", early_mem);
194 
195 static void __init
196 request_standard_resources(struct meminfo *mi)
197 {
198         struct resource *res;
199         int i;
200 
201         kernel_code.start   = virt_to_phys(_stext);
202         kernel_code.end     = virt_to_phys(_etext - 1);
203         kernel_data.start   = virt_to_phys(_sdata);
204         kernel_data.end     = virt_to_phys(_end - 1);
205 
206         for (i = 0; i < mi->nr_banks; i++) {
207                 if (mi->bank[i].size == 0)
208                         continue;
209 
210                 res = alloc_bootmem_low(sizeof(*res));
211                 res->name  = "System RAM";
212                 res->start = mi->bank[i].start;
213                 res->end   = mi->bank[i].start + mi->bank[i].size - 1;
214                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
215 
216                 request_resource(&iomem_resource, res);
217 
218                 if (kernel_code.start >= res->start &&
219                     kernel_code.end <= res->end)
220                         request_resource(res, &kernel_code);
221                 if (kernel_data.start >= res->start &&
222                     kernel_data.end <= res->end)
223                         request_resource(res, &kernel_data);
224         }
225 }
226 
227 static void (*init_machine)(void) __initdata;
228 
229 static int __init customize_machine(void)
230 {
231         /* customizes platform devices, or adds new ones */
232         if (init_machine)
233                 init_machine();
234         return 0;
235 }
236 arch_initcall(customize_machine);
237 
238 void __init setup_arch(char **cmdline_p)
239 {
240         char *from = default_command_line;
241 
242         setup_processor();
243 
244         init_mm.start_code = (unsigned long) _stext;
245         init_mm.end_code   = (unsigned long) _etext;
246         init_mm.end_data   = (unsigned long) _edata;
247         init_mm.brk        = (unsigned long) _end;
248 
249         /* parse_early_param needs a boot_command_line */
250         strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
251 
252         /* populate cmd_line too for later use, preserving boot_command_line */
253         strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
254         *cmdline_p = cmd_line;
255 
256         parse_early_param();
257 
258         uc32_memblock_init(&meminfo);
259 
260         paging_init();
261         request_standard_resources(&meminfo);
262 
263         cpu_init();
264 
265         /*
266          * Set up various architecture-specific pointers
267          */
268         init_machine = puv3_core_init;
269 
270 #ifdef CONFIG_VT
271 #if defined(CONFIG_VGA_CONSOLE)
272         conswitchp = &vga_con;
273 #elif defined(CONFIG_DUMMY_CONSOLE)
274         conswitchp = &dummy_con;
275 #endif
276 #endif
277         early_trap_init();
278 }
279 
280 static struct cpu cpuinfo_unicore;
281 
282 static int __init topology_init(void)
283 {
284         int i;
285 
286         for_each_possible_cpu(i)
287                 register_cpu(&cpuinfo_unicore, i);
288 
289         return 0;
290 }
291 subsys_initcall(topology_init);
292 
293 #ifdef CONFIG_HAVE_PROC_CPU
294 static int __init proc_cpu_init(void)
295 {
296         struct proc_dir_entry *res;
297 
298         res = proc_mkdir("cpu", NULL);
299         if (!res)
300                 return -ENOMEM;
301         return 0;
302 }
303 fs_initcall(proc_cpu_init);
304 #endif
305 
306 static int c_show(struct seq_file *m, void *v)
307 {
308         seq_printf(m, "Processor\t: UniCore-II rev %d (%s)\n",
309                    (int)(uc32_cpuid >> 16) & 15, elf_platform);
310 
311         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
312                    loops_per_jiffy / (500000/HZ),
313                    (loops_per_jiffy / (5000/HZ)) % 100);
314 
315         /* dump out the processor features */
316         seq_puts(m, "Features\t: CMOV UC-F64");
317 
318         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", uc32_cpuid >> 24);
319         seq_printf(m, "CPU architecture: 2\n");
320         seq_printf(m, "CPU revision\t: %d\n", (uc32_cpuid >> 16) & 15);
321 
322         seq_printf(m, "Cache type\t: write-back\n"
323                         "Cache clean\t: cp0 c5 ops\n"
324                         "Cache lockdown\t: not support\n"
325                         "Cache format\t: Harvard\n");
326 
327         seq_puts(m, "\n");
328 
329         seq_printf(m, "Hardware\t: PKUnity v3\n");
330 
331         return 0;
332 }
333 
334 static void *c_start(struct seq_file *m, loff_t *pos)
335 {
336         return *pos < 1 ? (void *)1 : NULL;
337 }
338 
339 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
340 {
341         ++*pos;
342         return NULL;
343 }
344 
345 static void c_stop(struct seq_file *m, void *v)
346 {
347 }
348 
349 const struct seq_operations cpuinfo_op = {
350         .start  = c_start,
351         .next   = c_next,
352         .stop   = c_stop,
353         .show   = c_show
354 };
355 

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