tools, slub: Fix off-by-one buffer corruption after readlink() call
[linux-2.6/linux-mips.git] / arch / sparc / kernel / setup_32.c
blobd26e1f6c717aa1f5fd3dffe2689594e1bce3b29a
1 /*
2 * linux/arch/sparc/kernel/setup.c
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
6 */
8 #include <linux/errno.h>
9 #include <linux/sched.h>
10 #include <linux/kernel.h>
11 #include <linux/mm.h>
12 #include <linux/stddef.h>
13 #include <linux/unistd.h>
14 #include <linux/ptrace.h>
15 #include <linux/slab.h>
16 #include <linux/initrd.h>
17 #include <asm/smp.h>
18 #include <linux/user.h>
19 #include <linux/screen_info.h>
20 #include <linux/delay.h>
21 #include <linux/fs.h>
22 #include <linux/seq_file.h>
23 #include <linux/syscalls.h>
24 #include <linux/kdev_t.h>
25 #include <linux/major.h>
26 #include <linux/string.h>
27 #include <linux/init.h>
28 #include <linux/interrupt.h>
29 #include <linux/console.h>
30 #include <linux/spinlock.h>
31 #include <linux/root_dev.h>
32 #include <linux/cpu.h>
33 #include <linux/kdebug.h>
35 #include <asm/system.h>
36 #include <asm/io.h>
37 #include <asm/processor.h>
38 #include <asm/oplib.h>
39 #include <asm/page.h>
40 #include <asm/pgtable.h>
41 #include <asm/traps.h>
42 #include <asm/vaddrs.h>
43 #include <asm/mbus.h>
44 #include <asm/idprom.h>
45 #include <asm/machines.h>
46 #include <asm/cpudata.h>
47 #include <asm/setup.h>
49 #include "kernel.h"
51 struct screen_info screen_info = {
52 0, 0, /* orig-x, orig-y */
53 0, /* unused */
54 0, /* orig-video-page */
55 0, /* orig-video-mode */
56 128, /* orig-video-cols */
57 0,0,0, /* ega_ax, ega_bx, ega_cx */
58 54, /* orig-video-lines */
59 0, /* orig-video-isVGA */
60 16 /* orig-video-points */
63 /* Typing sync at the prom prompt calls the function pointed to by
64 * romvec->pv_synchook which I set to the following function.
65 * This should sync all filesystems and return, for now it just
66 * prints out pretty messages and returns.
69 extern unsigned long trapbase;
71 /* Pretty sick eh? */
72 static void prom_sync_me(void)
74 unsigned long prom_tbr, flags;
76 /* XXX Badly broken. FIX! - Anton */
77 local_irq_save(flags);
78 __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
79 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
80 "nop\n\t"
81 "nop\n\t"
82 "nop\n\t" : : "r" (&trapbase));
84 prom_printf("PROM SYNC COMMAND...\n");
85 show_free_areas(0);
86 if(current->pid != 0) {
87 local_irq_enable();
88 sys_sync();
89 local_irq_disable();
91 prom_printf("Returning to prom\n");
93 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
94 "nop\n\t"
95 "nop\n\t"
96 "nop\n\t" : : "r" (prom_tbr));
97 local_irq_restore(flags);
100 static unsigned int boot_flags __initdata = 0;
101 #define BOOTME_DEBUG 0x1
103 /* Exported for mm/init.c:paging_init. */
104 unsigned long cmdline_memory_size __initdata = 0;
106 /* which CPU booted us (0xff = not set) */
107 unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */
108 unsigned char boot_cpu_id4; /* boot_cpu_id << 2 */
110 static void
111 prom_console_write(struct console *con, const char *s, unsigned n)
113 prom_write(s, n);
116 static struct console prom_early_console = {
117 .name = "earlyprom",
118 .write = prom_console_write,
119 .flags = CON_PRINTBUFFER | CON_BOOT,
120 .index = -1,
124 * Process kernel command line switches that are specific to the
125 * SPARC or that require special low-level processing.
127 static void __init process_switch(char c)
129 switch (c) {
130 case 'd':
131 boot_flags |= BOOTME_DEBUG;
132 break;
133 case 's':
134 break;
135 case 'h':
136 prom_printf("boot_flags_init: Halt!\n");
137 prom_halt();
138 break;
139 case 'p':
140 /* Just ignore, this behavior is now the default. */
141 break;
142 default:
143 printk("Unknown boot switch (-%c)\n", c);
144 break;
148 static void __init boot_flags_init(char *commands)
150 while (*commands) {
151 /* Move to the start of the next "argument". */
152 while (*commands && *commands == ' ')
153 commands++;
155 /* Process any command switches, otherwise skip it. */
156 if (*commands == '\0')
157 break;
158 if (*commands == '-') {
159 commands++;
160 while (*commands && *commands != ' ')
161 process_switch(*commands++);
162 continue;
164 if (!strncmp(commands, "mem=", 4)) {
166 * "mem=XXX[kKmM] overrides the PROM-reported
167 * memory size.
169 cmdline_memory_size = simple_strtoul(commands + 4,
170 &commands, 0);
171 if (*commands == 'K' || *commands == 'k') {
172 cmdline_memory_size <<= 10;
173 commands++;
174 } else if (*commands=='M' || *commands=='m') {
175 cmdline_memory_size <<= 20;
176 commands++;
179 while (*commands && *commands != ' ')
180 commands++;
184 /* This routine will in the future do all the nasty prom stuff
185 * to probe for the mmu type and its parameters, etc. This will
186 * also be where SMP things happen.
189 extern void sun4c_probe_vac(void);
191 extern unsigned short root_flags;
192 extern unsigned short root_dev;
193 extern unsigned short ram_flags;
194 #define RAMDISK_IMAGE_START_MASK 0x07FF
195 #define RAMDISK_PROMPT_FLAG 0x8000
196 #define RAMDISK_LOAD_FLAG 0x4000
198 extern int root_mountflags;
200 char reboot_command[COMMAND_LINE_SIZE];
202 enum sparc_cpu sparc_cpu_model;
203 EXPORT_SYMBOL(sparc_cpu_model);
205 struct tt_entry *sparc_ttable;
207 struct pt_regs fake_swapper_regs;
209 void __init setup_arch(char **cmdline_p)
211 int i;
212 unsigned long highest_paddr;
214 sparc_ttable = (struct tt_entry *) &trapbase;
216 /* Initialize PROM console and command line. */
217 *cmdline_p = prom_getbootargs();
218 strcpy(boot_command_line, *cmdline_p);
219 parse_early_param();
221 boot_flags_init(*cmdline_p);
223 register_console(&prom_early_console);
225 /* Set sparc_cpu_model */
226 sparc_cpu_model = sun_unknown;
227 if (!strcmp(&cputypval[0], "sun4 "))
228 sparc_cpu_model = sun4;
229 if (!strcmp(&cputypval[0], "sun4c"))
230 sparc_cpu_model = sun4c;
231 if (!strcmp(&cputypval[0], "sun4m"))
232 sparc_cpu_model = sun4m;
233 if (!strcmp(&cputypval[0], "sun4s"))
234 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
235 if (!strcmp(&cputypval[0], "sun4d"))
236 sparc_cpu_model = sun4d;
237 if (!strcmp(&cputypval[0], "sun4e"))
238 sparc_cpu_model = sun4e;
239 if (!strcmp(&cputypval[0], "sun4u"))
240 sparc_cpu_model = sun4u;
241 if (!strncmp(&cputypval[0], "leon" , 4))
242 sparc_cpu_model = sparc_leon;
244 printk("ARCH: ");
245 switch(sparc_cpu_model) {
246 case sun4:
247 printk("SUN4\n");
248 break;
249 case sun4c:
250 printk("SUN4C\n");
251 break;
252 case sun4m:
253 printk("SUN4M\n");
254 break;
255 case sun4d:
256 printk("SUN4D\n");
257 break;
258 case sun4e:
259 printk("SUN4E\n");
260 break;
261 case sun4u:
262 printk("SUN4U\n");
263 break;
264 case sparc_leon:
265 printk("LEON\n");
266 break;
267 default:
268 printk("UNKNOWN!\n");
269 break;
272 #ifdef CONFIG_DUMMY_CONSOLE
273 conswitchp = &dummy_con;
274 #endif
276 idprom_init();
277 if (ARCH_SUN4C)
278 sun4c_probe_vac();
279 load_mmu();
281 phys_base = 0xffffffffUL;
282 highest_paddr = 0UL;
283 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
284 unsigned long top;
286 if (sp_banks[i].base_addr < phys_base)
287 phys_base = sp_banks[i].base_addr;
288 top = sp_banks[i].base_addr +
289 sp_banks[i].num_bytes;
290 if (highest_paddr < top)
291 highest_paddr = top;
293 pfn_base = phys_base >> PAGE_SHIFT;
295 if (!root_flags)
296 root_mountflags &= ~MS_RDONLY;
297 ROOT_DEV = old_decode_dev(root_dev);
298 #ifdef CONFIG_BLK_DEV_RAM
299 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
300 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
301 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
302 #endif
304 prom_setsync(prom_sync_me);
306 if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
307 ((*(short *)linux_dbvec) != -1)) {
308 printk("Booted under KADB. Syncing trap table.\n");
309 (*(linux_dbvec->teach_debugger))();
312 init_mm.context = (unsigned long) NO_CONTEXT;
313 init_task.thread.kregs = &fake_swapper_regs;
315 paging_init();
317 smp_setup_cpu_possible_map();
320 extern int stop_a_enabled;
322 void sun_do_break(void)
324 if (!stop_a_enabled)
325 return;
327 printk("\n");
328 flush_user_windows();
330 prom_cmdline();
332 EXPORT_SYMBOL(sun_do_break);
334 int stop_a_enabled = 1;
336 static int __init topology_init(void)
338 int i, ncpus, err;
340 /* Count the number of physically present processors in
341 * the machine, even on uniprocessor, so that /proc/cpuinfo
342 * output is consistent with 2.4.x
344 ncpus = 0;
345 while (!cpu_find_by_instance(ncpus, NULL, NULL))
346 ncpus++;
347 ncpus_probed = ncpus;
349 err = 0;
350 for_each_online_cpu(i) {
351 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
352 if (!p)
353 err = -ENOMEM;
354 else
355 register_cpu(p, i);
358 return err;
361 subsys_initcall(topology_init);