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Diffstat (limited to 'arch/v850/kernel/sim.c')
| -rw-r--r-- | arch/v850/kernel/sim.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/arch/v850/kernel/sim.c b/arch/v850/kernel/sim.c new file mode 100644 index 000000000000..4f31da962632 --- /dev/null +++ b/arch/v850/kernel/sim.c @@ -0,0 +1,179 @@ +/* + * arch/v850/kernel/sim.c -- Machine-specific stuff for GDB v850e simulator + * + * Copyright (C) 2001,02 NEC Corporation + * Copyright (C) 2001,02 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/bootmem.h> +#include <linux/irq.h> + +#include <asm/atomic.h> +#include <asm/page.h> +#include <asm/machdep.h> +#include <asm/simsyscall.h> + +#include "mach.h" + +/* The name of a file containing the root filesystem. */ +#define ROOT_FS "rootfs.image" + +extern void simcons_setup (void); +extern void simcons_poll_ttys (void); +extern void set_mem_root (void *addr, size_t len, char *cmd_line); + +static int read_file (const char *name, + unsigned long *addr, unsigned long *len, + const char **err); + +void __init mach_setup (char **cmdline) +{ + const char *err; + unsigned long root_dev_addr, root_dev_len; + + simcons_setup (); + + printk (KERN_INFO "Reading root filesystem: %s", ROOT_FS); + + if (read_file (ROOT_FS, &root_dev_addr, &root_dev_len, &err)) { + printk (" (size %luK)\n", root_dev_len / 1024); + set_mem_root ((void *)root_dev_addr, (size_t)root_dev_len, + *cmdline); + } else + printk ("...%s failed!\n", err); +} + +void mach_get_physical_ram (unsigned long *ram_start, unsigned long *ram_len) +{ + *ram_start = RAM_ADDR; + *ram_len = RAM_SIZE; +} + +void __init mach_sched_init (struct irqaction *timer_action) +{ + /* ...do magic timer initialization?... */ + mach_tick = simcons_poll_ttys; + setup_irq (0, timer_action); +} + + +static void irq_nop (unsigned irq) { } +static unsigned irq_zero (unsigned irq) { return 0; } + +static struct hw_interrupt_type sim_irq_type = { + "IRQ", + irq_zero, /* startup */ + irq_nop, /* shutdown */ + irq_nop, /* enable */ + irq_nop, /* disable */ + irq_nop, /* ack */ + irq_nop, /* end */ +}; + +void __init mach_init_irqs (void) +{ + init_irq_handlers (0, NUM_MACH_IRQS, 1, &sim_irq_type); +} + + +void mach_gettimeofday (struct timespec *tv) +{ + long timeval[2], timezone[2]; + int rval = V850_SIM_SYSCALL (gettimeofday, timeval, timezone); + if (rval == 0) { + tv->tv_sec = timeval[0]; + tv->tv_nsec = timeval[1] * 1000; + } +} + +void machine_restart (char *__unused) +{ + V850_SIM_SYSCALL (write, 1, "RESTART\n", 8); + V850_SIM_SYSCALL (exit, 0); +} + +EXPORT_SYMBOL(machine_restart); + +void machine_halt (void) +{ + V850_SIM_SYSCALL (write, 1, "HALT\n", 5); + V850_SIM_SYSCALL (exit, 0); +} + +EXPORT_SYMBOL(machine_halt); + +void machine_power_off (void) +{ + V850_SIM_SYSCALL (write, 1, "POWER OFF\n", 10); + V850_SIM_SYSCALL (exit, 0); +} + +EXPORT_SYMBOL(machine_power_off); + + +/* Load data from a file called NAME into ram. The address and length + of the data image are returned in ADDR and LEN. */ +static int __init +read_file (const char *name, + unsigned long *addr, unsigned long *len, + const char **err) +{ + int rval, fd; + unsigned long cur, left; + /* Note this is not a normal stat buffer, it's an ad-hoc + structure defined by the simulator. */ + unsigned long stat_buf[10]; + + /* Stat the file to find out the length. */ + rval = V850_SIM_SYSCALL (stat, name, stat_buf); + if (rval < 0) { + if (err) *err = "stat"; + return 0; + } + *len = stat_buf[4]; + + /* Open the file; `0' is O_RDONLY. */ + fd = V850_SIM_SYSCALL (open, name, 0); + if (fd < 0) { + if (err) *err = "open"; + return 0; + } + + *addr = (unsigned long)alloc_bootmem(*len); + if (! *addr) { + V850_SIM_SYSCALL (close, fd); + if (err) *err = "alloc_bootmem"; + return 0; + } + + cur = *addr; + left = *len; + while (left > 0) { + int chunk = V850_SIM_SYSCALL (read, fd, cur, left); + if (chunk <= 0) + break; + cur += chunk; + left -= chunk; + } + V850_SIM_SYSCALL (close, fd); + if (left > 0) { + /* Some read failed. */ + free_bootmem (*addr, *len); + if (err) *err = "read"; + return 0; + } + + return 1; +} |