Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 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 = { |
Thomas Gleixner | aecd456 | 2005-09-10 00:26:43 -0700 | [diff] [blame] | 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 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | void machine_halt (void) |
| 108 | { |
| 109 | V850_SIM_SYSCALL (write, 1, "HALT\n", 5); |
| 110 | V850_SIM_SYSCALL (exit, 0); |
| 111 | } |
| 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
| 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 | } |