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/config.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/mm.h>
  19 #include <linux/swap.h>
  20 #include <linux/bootmem.h>
  21 #include <linux/irq.h>
  22
  23 #include <asm/atomic.h>
  24 #include <asm/page.h>
  25 #include <asm/machdep.h>
  26 #include <asm/simsyscall.h>
  27
  28 #include "mach.h"
  29
  30 /* The name of a file containing the root filesystem.  */
  31 #define ROOT_FS "rootfs.image"
  32
  33 extern void simcons_setup (void);
  34 extern void simcons_poll_ttys (void);
  35 extern void set_mem_root (void *addr, size_t len, char *cmd_line);
  36
  37 static int read_file (const char *name,
  38                       unsigned long *addr, unsigned long *len,
  39                       const char **err);
  40
  41 void __init mach_setup (char **cmdline)
  42 {
  43         const char *err;
  44         unsigned long root_dev_addr, root_dev_len;
  45
  46         simcons_setup ();
  47
  48         printk (KERN_INFO "Reading root filesystem: %s", ROOT_FS);
  49
  50         if (read_file (ROOT_FS, &root_dev_addr, &root_dev_len, &err)) {
  51                 printk (" (size %luK)\n", root_dev_len / 1024);
  52                 set_mem_root ((void *)root_dev_addr, (size_t)root_dev_len,
  53                               *cmdline);
  54         } else
  55                 printk ("...%s failed!\n", err);
  56 }
  57
  58 void mach_get_physical_ram (unsigned long *ram_start, unsigned long *ram_len)
  59 {
  60         *ram_start = RAM_ADDR;
  61         *ram_len = RAM_SIZE;
  62 }
  63
  64 void __init mach_sched_init (struct irqaction *timer_action)
  65 {
  66         /* ...do magic timer initialization?...  */
  67         mach_tick = simcons_poll_ttys;
  68         setup_irq (0, timer_action);
  69 }
  70
  71 \f
  72 static void irq_nop (unsigned irq) { }
  73 static unsigned irq_zero (unsigned irq) { return 0; }
  74
  75 static struct hw_interrupt_type sim_irq_type = {
  76         .typename = "IRQ",
  77         .startup = irq_zero,            /* startup */
  78         .shutdown = irq_nop,            /* shutdown */
  79         .enable = irq_nop,              /* enable */
  80         .disable = irq_nop,             /* disable */
  81         .ack = irq_nop,         /* ack */
  82         .end = irq_nop,         /* end */
  83 };
  84
  85 void __init mach_init_irqs (void)
  86 {
  87         init_irq_handlers (0, NUM_MACH_IRQS, 1, &sim_irq_type);
  88 }
  89
  90 \f
  91 void mach_gettimeofday (struct timespec *tv)
  92 {
  93         long timeval[2], timezone[2];
  94         int rval = V850_SIM_SYSCALL (gettimeofday, timeval, timezone);
  95         if (rval == 0) {
  96                 tv->tv_sec = timeval[0];
  97                 tv->tv_nsec = timeval[1] * 1000;
  98         }
  99 }
 100
 101 void machine_restart (char *__unused)
 102 {
 103         V850_SIM_SYSCALL (write, 1, "RESTART\n", 8);
 104         V850_SIM_SYSCALL (exit, 0);
 105 }
 106
 107 void machine_halt (void)
 108 {
 109         V850_SIM_SYSCALL (write, 1, "HALT\n", 5);
 110         V850_SIM_SYSCALL (exit, 0);
 111 }
 112
 113 void machine_power_off (void)
 114 {
 115         V850_SIM_SYSCALL (write, 1, "POWER OFF\n", 10);
 116         V850_SIM_SYSCALL (exit, 0);
 117 }
 118
 119 \f
 120 /* Load data from a file called NAME into ram.  The address and length
 121    of the data image are returned in ADDR and LEN.  */
 122 static int __init
 123 read_file (const char *name,
 124            unsigned long *addr, unsigned long *len,
 125            const char **err)
 126 {
 127         int rval, fd;
 128         unsigned long cur, left;
 129         /* Note this is not a normal stat buffer, it's an ad-hoc
 130            structure defined by the simulator.  */
 131         unsigned long stat_buf[10];
 132
 133         /* Stat the file to find out the length.  */
 134         rval = V850_SIM_SYSCALL (stat, name, stat_buf);
 135         if (rval < 0) {
 136                 if (err) *err = "stat";
 137                 return 0;
 138         }
 139         *len = stat_buf[4];
 140
 141         /* Open the file; `0' is O_RDONLY.  */
 142         fd = V850_SIM_SYSCALL (open, name, 0);
 143         if (fd < 0) {
 144                 if (err) *err = "open";
 145                 return 0;
 146         }
 147
 148         *addr = (unsigned long)alloc_bootmem(*len);
 149         if (! *addr) {
 150                 V850_SIM_SYSCALL (close, fd);
 151                 if (err) *err = "alloc_bootmem";
 152                 return 0;
 153         }
 154
 155         cur = *addr;
 156         left = *len;
 157         while (left > 0) {
 158                 int chunk = V850_SIM_SYSCALL (read, fd, cur, left);
 159                 if (chunk <= 0)
 160                         break;
 161                 cur += chunk;
 162                 left -= chunk;
 163         }
 164         V850_SIM_SYSCALL (close, fd);
 165         if (left > 0) {
 166                 /* Some read failed.  */
 167                 free_bootmem (*addr, *len);
 168                 if (err) *err = "read";
 169                 return 0;
 170         }
 171
 172         return 1;
 173 }