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TOMOYO Linux Cross Reference
Linux/arch/hexagon/kernel/setup.c

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  1 /*
  2  * Arch related setup for Hexagon
  3  *
  4  * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 and
  8  * only version 2 as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  * GNU General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, write to the Free Software
 17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 18  * 02110-1301, USA.
 19  */
 20 
 21 #include <linux/init.h>
 22 #include <linux/bootmem.h>
 23 #include <linux/mmzone.h>
 24 #include <linux/mm.h>
 25 #include <linux/seq_file.h>
 26 #include <linux/console.h>
 27 #include <linux/of_fdt.h>
 28 #include <asm/io.h>
 29 #include <asm/sections.h>
 30 #include <asm/setup.h>
 31 #include <asm/processor.h>
 32 #include <asm/hexagon_vm.h>
 33 #include <asm/vm_mmu.h>
 34 #include <asm/time.h>
 35 #ifdef CONFIG_OF
 36 #include <asm/prom.h>
 37 #endif
 38 
 39 char cmd_line[COMMAND_LINE_SIZE];
 40 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 41 
 42 int on_simulator;
 43 
 44 void __cpuinit calibrate_delay(void)
 45 {
 46         loops_per_jiffy = thread_freq_mhz * 1000000 / HZ;
 47 }
 48 
 49 /*
 50  * setup_arch -  high level architectural setup routine
 51  * @cmdline_p: pointer to pointer to command-line arguments
 52  */
 53 
 54 void __init setup_arch(char **cmdline_p)
 55 {
 56         char *p = &external_cmdline_buffer;
 57 
 58         /*
 59          * These will eventually be pulled in via either some hypervisor
 60          * or devicetree description.  Hardwiring for now.
 61          */
 62         pcycle_freq_mhz = 600;
 63         thread_freq_mhz = 100;
 64         sleep_clk_freq = 32000;
 65 
 66         /*
 67          * Set up event bindings to handle exceptions and interrupts.
 68          */
 69         __vmsetvec(_K_VM_event_vector);
 70 
 71         /*
 72          * Simulator has a few differences from the hardware.
 73          * For now, check uninitialized-but-mapped memory
 74          * prior to invoking setup_arch_memory().
 75          */
 76         if (*(int *)((unsigned long)_end + 8) == 0x1f1f1f1f)
 77                 on_simulator = 1;
 78         else
 79                 on_simulator = 0;
 80 
 81         if (p[0] != '\0')
 82                 strlcpy(boot_command_line, p, COMMAND_LINE_SIZE);
 83         else
 84                 strlcpy(boot_command_line, default_command_line,
 85                         COMMAND_LINE_SIZE);
 86 
 87         /*
 88          * boot_command_line and the value set up by setup_arch
 89          * are both picked up by the init code. If no reason to
 90          * make them different, pass the same pointer back.
 91          */
 92         strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
 93         *cmdline_p = cmd_line;
 94 
 95         parse_early_param();
 96 
 97         setup_arch_memory();
 98 
 99 #ifdef CONFIG_SMP
100         smp_start_cpus();
101 #endif
102 }
103 
104 /*
105  * Functions for dumping CPU info via /proc
106  * Probably should move to kernel/proc.c or something.
107  */
108 static void *c_start(struct seq_file *m, loff_t *pos)
109 {
110         return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
111 }
112 
113 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
114 {
115         ++*pos;
116         return c_start(m, pos);
117 }
118 
119 static void c_stop(struct seq_file *m, void *v)
120 {
121 }
122 
123 /*
124  * Eventually this will dump information about
125  * CPU properties like ISA level, TLB size, etc.
126  */
127 static int show_cpuinfo(struct seq_file *m, void *v)
128 {
129         int cpu = (unsigned long) v - 1;
130 
131         seq_printf(m, "processor\t: %d\n", cpu);
132         seq_printf(m, "model name\t: Hexagon Virtual Machine\n");
133         seq_printf(m, "BogoMips\t: %lu.%02lu\n",
134                 (loops_per_jiffy * HZ) / 500000,
135                 ((loops_per_jiffy * HZ) / 5000) % 100);
136         seq_printf(m, "\n");
137         return 0;
138 }
139 
140 const struct seq_operations cpuinfo_op = {
141         .start  = &c_start,
142         .next   = &c_next,
143         .stop   = &c_stop,
144         .show   = &show_cpuinfo,
145 };
146 

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