/* * 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 /* file_operations */ #include #include /* VM_IO */ #include #include 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); net-next.git/refs/?id=5db4992d8f040b8d8db0b86d42806e0c417f7ccf'>refslog tree commit diff

path: root/arch/m68k/include/asm/mcfsim.h

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