ARC: Hostlink Pseudo-Driver for Metaware Debugger (cbe056f7) · Commits · 戴 / test

arch/arc/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -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

arch/arc/kernel/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

arch/arc/kernel/arc_hostlink.c

0 → 100644

+58 −0

Original line number	Diff line number	Diff line
		/*
		* 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);

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