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ARC: Hostlink Pseudo-Driver for Metaware Debugger

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This allows ARC Target to do I/O to host in absence of any peripherals
whatsoever, assisted by Metaware Hostlink facility.

Further we have a FUSE based filesystem which makes us mount/access host
filesystem on target and do fops.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2013-01-18 15:12:25 +05:30
parent 8b5850f8ac
commit cbe056f76a
3 changed files with 68 additions and 0 deletions
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9
arch/arc/Kconfig
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@ -389,6 +389,15 @@ config HZ
int "Timer Frequency"
default 100
config ARC_METAWARE_HLINK
bool "Support for Metaware debugger assisted Host access"
default n
help
This options allows a Linux userland apps to directly access
host file system (open/creat/read/write etc) with help from
Metaware Debugger. This can come in handy for Linux-host communication
when there is no real usable peripheral such as EMAC.
menuconfig ARC_DBG
bool "ARC debugging"
default y

1
arch/arc/kernel/Makefile
View File

@ -18,6 +18,7 @@ obj-$(CONFIG_ARC_DW2_UNWIND) += unwind.o
obj-$(CONFIG_KPROBES) += kprobes.o
obj-$(CONFIG_ARC_MISALIGN_ACCESS) += unaligned.o
obj-$(CONFIG_KGDB) += kgdb.o
obj-$(CONFIG_ARC_METAWARE_HLINK) += arc_hostlink.o
obj-$(CONFIG_ARC_FPU_SAVE_RESTORE) += fpu.o
CFLAGS_fpu.o += -mdpfp

58
arch/arc/kernel/arc_hostlink.c Normal file
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@ -0,0 +1,58 @@
/*
* arc_hostlink.c: Pseudo-driver for Metaware provided "hostlink" facility
*
* Allows Linux userland access to host in absence of any peripherals.
*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/fs.h> /* file_operations */
#include <linux/miscdevice.h>
#include <linux/mm.h> /* VM_IO */
#include <linux/module.h>
#include <linux/uaccess.h>
static unsigned char __HOSTLINK__[4 * PAGE_SIZE] __aligned(PAGE_SIZE);
static int arc_hl_mmap(struct file *fp, struct vm_area_struct *vma)
{
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
vma->vm_end - vma->vm_start,
vma->vm_page_prot)) {
pr_warn("Hostlink buffer mmap ERROR\n");
return -EAGAIN;
}
return 0;
}
static long arc_hl_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
/* we only support, returning the physical addr to mmap in user space */
put_user((unsigned int)__HOSTLINK__, (int __user *)arg);
return 0;
}
static const struct file_operations arc_hl_fops = {
.unlocked_ioctl = arc_hl_ioctl,
.mmap = arc_hl_mmap,
};
static struct miscdevice arc_hl_dev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "hostlink",
.fops = &arc_hl_fops
};
static int __init arc_hl_init(void)
{
pr_info("ARC Hostlink driver mmap at 0x%p\n", __HOSTLINK__);
return misc_register(&arc_hl_dev);
}
module_init(arc_hl_init);