arch/v850/kernel/sim.c

   1 /*
   2  * arch/v850/kernel/sim.c -- Machine-specific stuff for GDB v850e simulator
   3  *
   4  *  Copyright (C) 2001,02  NEC Corporation
   5  *  Copyright (C) 2001,02  Miles Bader <miles@gnu.org>
   6  *
   7  * This file is subject to the terms and conditions of the GNU General
   8  * Public License.  See the file COPYING in the main directory of this
   9  * archive for more details.
  10  *
  11  * Written by Miles Bader <miles@gnu.org>
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/mm.h>
  18 #include <linux/swap.h>
  19 #include <linux/bootmem.h>
  20 #include <linux/irq.h>
  21
  22 #include <asm/atomic.h>
  23 #include <asm/page.h>
  24 #include <asm/machdep.h>
  25 #include <asm/simsyscall.h>
  26
  27 #include "mach.h"
  28
  29 /* The name of a file containing the root filesystem.  */
  30 #define ROOT_FS "rootfs.image"
  31
  32 extern void simcons_setup (void);
  33 extern void simcons_poll_ttys (void);
  34 extern void set_mem_root (void *addr, size_t len, char *cmd_line);
  35
  36 static int read_file (const char *name,
  37                       unsigned long *addr, unsigned long *len,
  38                       const char **err);
  39
  40 void __init mach_setup (char **cmdline)
  41 {
  42         const char *err;
  43         unsigned long root_dev_addr, root_dev_len;
  44
  45         simcons_setup ();
  46
  47         printk (KERN_INFO "Reading root filesystem: %s", ROOT_FS);
  48
  49         if (read_file (ROOT_FS, &root_dev_addr, &root_dev_len, &err)) {
  50                 printk (" (size %luK)\n", root_dev_len / 1024);
  51                 set_mem_root ((void *)root_dev_addr, (size_t)root_dev_len,
  52                               *cmdline);
  53         } else
  54                 printk ("...%s failed!\n", err);
  55 }
  56
  57 void mach_get_physical_ram (unsigned long *ram_start, unsigned long *ram_len)
  58 {
  59         *ram_start = RAM_ADDR;
  60         *ram_len = RAM_SIZE;
  61 }
  62
  63 void __init mach_sched_init (struct irqaction *timer_action)
  64 {
  65         /* ...do magic timer initialization?...  */
  66         mach_tick = simcons_poll_ttys;
  67         setup_irq (0, timer_action);
  68 }
  69
  70 \f
  71 static void irq_nop (unsigned irq) { }
  72 static unsigned irq_zero (unsigned irq) { return 0; }
  73
  74 static struct hw_interrupt_type sim_irq_type = {
  75         .typename = "IRQ",
  76         .startup = irq_zero,            /* startup */
  77         .shutdown = irq_nop,            /* shutdown */
  78         .enable = irq_nop,              /* enable */
  79         .disable = irq_nop,             /* disable */
  80         .ack = irq_nop,         /* ack */
  81         .end = irq_nop,         /* end */
  82 };
  83
  84 void __init mach_init_irqs (void)
  85 {
  86         init_irq_handlers (0, NUM_MACH_IRQS, 1, &sim_irq_type);
  87 }
  88
  89 \f
  90 void mach_gettimeofday (struct timespec *tv)
  91 {
  92         long timeval[2], timezone[2];
  93         int rval = V850_SIM_SYSCALL (gettimeofday, timeval, timezone);
  94         if (rval == 0) {
  95                 tv->tv_sec = timeval[0];
  96                 tv->tv_nsec = timeval[1] * 1000;
  97         }
  98 }
  99
 100 void machine_restart (char *__unused)
 101 {
 102         V850_SIM_SYSCALL (write, 1, "RESTART\n", 8);
 103         V850_SIM_SYSCALL (exit, 0);
 104 }
 105
 106 void machine_halt (void)
 107 {
 108         V850_SIM_SYSCALL (write, 1, "HALT\n", 5);
 109         V850_SIM_SYSCALL (exit, 0);
 110 }
 111
 112 void machine_power_off (void)
 113 {
 114         V850_SIM_SYSCALL (write, 1, "POWER OFF\n", 10);
 115         V850_SIM_SYSCALL (exit, 0);
 116 }
 117
 118 \f
 119 /* Load data from a file called NAME into ram.  The address and length
 120    of the data image are returned in ADDR and LEN.  */
 121 static int __init
 122 read_file (const char *name,
 123            unsigned long *addr, unsigned long *len,
 124            const char **err)
 125 {
 126         int rval, fd;
 127         unsigned long cur, left;
 128         /* Note this is not a normal stat buffer, it's an ad-hoc
 129            structure defined by the simulator.  */
 130         unsigned long stat_buf[10];
 131
 132         /* Stat the file to find out the length.  */
 133         rval = V850_SIM_SYSCALL (stat, name, stat_buf);
 134         if (rval < 0) {
 135                 if (err) *err = "stat";
 136                 return 0;
 137         }
 138         *len = stat_buf[4];
 139
 140         /* Open the file; `0' is O_RDONLY.  */
 141         fd = V850_SIM_SYSCALL (open, name, 0);
 142         if (fd < 0) {
 143                 if (err) *err = "open";
 144                 return 0;
 145         }
 146
 147         *addr = (unsigned long)alloc_bootmem(*len);
 148         if (! *addr) {
 149                 V850_SIM_SYSCALL (close, fd);
 150                 if (err) *err = "alloc_bootmem";
 151                 return 0;
 152         }
 153
 154         cur = *addr;
 155         left = *len;
 156         while (left > 0) {
 157                 int chunk = V850_SIM_SYSCALL (read, fd, cur, left);
 158                 if (chunk <= 0)
 159                         break;
 160                 cur += chunk;
 161                 left -= chunk;
 162         }
 163         V850_SIM_SYSCALL (close, fd);
 164         if (left > 0) {
 165                 /* Some read failed.  */
 166                 free_bootmem (*addr, *len);
 167                 if (err) *err = "read";
 168                 return 0;
 169         }
 170
 171         return 1;
 172 }