diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arc/Kconfig | 9 | ||||
| -rw-r--r-- | arch/arc/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/arc/kernel/arc_hostlink.c | 58 |
3 files changed, 68 insertions, 0 deletions
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 2611a60cb059..cd4ad61c4c14 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -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 diff --git a/arch/arc/kernel/Makefile b/arch/arc/kernel/Makefile index 6da2b12cf7e3..c242ef07ba70 100644 --- a/arch/arc/kernel/Makefile +++ b/arch/arc/kernel/Makefile @@ -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 diff --git a/arch/arc/kernel/arc_hostlink.c b/arch/arc/kernel/arc_hostlink.c new file mode 100644 index 000000000000..47b2a17cc52a --- /dev/null +++ b/arch/arc/kernel/arc_hostlink.c @@ -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); |
