This patch adds support for system calls from userspaces. It uses the asm-generic/unistd.h definitions with architecture spcific syscall. The sys_call_table is just an array defined in a C file and it contains pointers to the syscall functions. Signed-off-by: Ley Foon Tan <lftan@xxxxxxxxxx> --- arch/nios2/include/asm/syscalls.h | 25 +++++++++++++ arch/nios2/include/uapi/asm/unistd.h | 25 +++++++++++++ arch/nios2/kernel/sys_nios2.c | 72 ++++++++++++++++++++++++++++++++++++ arch/nios2/kernel/syscall_table.c | 29 +++++++++++++++ 4 files changed, 151 insertions(+) create mode 100644 arch/nios2/include/asm/syscalls.h create mode 100644 arch/nios2/include/uapi/asm/unistd.h create mode 100644 arch/nios2/kernel/sys_nios2.c create mode 100644 arch/nios2/kernel/syscall_table.c diff --git a/arch/nios2/include/asm/syscalls.h b/arch/nios2/include/asm/syscalls.h new file mode 100644 index 0000000..0245d780351b35a11bfe132377c9f5230cbebd8e --- /dev/null +++ b/arch/nios2/include/asm/syscalls.h @@ -0,0 +1,25 @@ +/* + * Copyright Altera Corporation (C) 2013. All rights reserved + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + * + */ +#ifndef __ASM_NIOS2_SYSCALLS_H +#define __ASM_NIOS2_SYSCALLS_H + +int sys_cacheflush(unsigned long addr, unsigned long len, + unsigned int op); + +#include <asm-generic/syscalls.h> + +#endif /* __ASM_NIOS2_SYSCALLS_H */ diff --git a/arch/nios2/include/uapi/asm/unistd.h b/arch/nios2/include/uapi/asm/unistd.h new file mode 100644 index 0000000..c4bf7951046153b3a39f5c11a21dadfe3de0f74a --- /dev/null +++ b/arch/nios2/include/uapi/asm/unistd.h @@ -0,0 +1,25 @@ +/* + * Copyright (C) 2013 Altera Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + * + */ + + #define sys_mmap2 sys_mmap_pgoff + +/* Use the standard ABI for syscalls */ +#include <asm-generic/unistd.h> + +/* Additional Nios II specific syscalls. */ +#define __NR_cacheflush (__NR_arch_specific_syscall) +__SYSCALL(__NR_cacheflush, sys_cacheflush) diff --git a/arch/nios2/kernel/sys_nios2.c b/arch/nios2/kernel/sys_nios2.c new file mode 100644 index 0000000..994bf8ad53c4a1c68a658bc936a44812235e46c3 --- /dev/null +++ b/arch/nios2/kernel/sys_nios2.c @@ -0,0 +1,72 @@ +/* + * Copyright (C) 2013 Altera Corporation + * Copyright (C) 2011-2012 Tobias Klauser <tklauser@xxxxxxxxxx> + * Copyright (C) 2004 Microtronix Datacom Ltd. + * + * 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. + */ + +#include <linux/export.h> +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/slab.h> +#include <linux/syscalls.h> + +#include <asm/cacheflush.h> +#include <asm/traps.h> + +asmlinkage long sys_mmap(unsigned long addr, unsigned long len, + unsigned long prot, unsigned long flags, + unsigned long fd, unsigned long offset) +{ + if (offset & ~PAGE_MASK) + return -EINVAL; + + return sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); +} + +/* sys_cacheflush -- flush the processor cache. */ +asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, + unsigned int op) +{ + struct vm_area_struct *vma; + + if (len == 0) + return 0; + + /* Check for overflow */ + if (addr + len < addr) + return -EFAULT; + + /* + * Verify that the specified address region actually belongs + * to this process. + */ + vma = find_vma(current->mm, addr); + if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) + return -EFAULT; + + /* Ignore the scope and cache arguments. */ + flush_cache_range(vma, addr, addr + len); + + return 0; +} + +asmlinkage int sys_getpagesize(void) +{ + return PAGE_SIZE; +} + +#if defined(CONFIG_FB) || defined(CONFIG_FB_MODULE) +#include <linux/fb.h> +unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, + unsigned long len, unsigned long pgoff, unsigned long flags) +{ + + struct fb_info *info = filp->private_data; + return info->screen_base; +} +EXPORT_SYMBOL(get_fb_unmapped_area); +#endif /* CONFIG_FB */ diff --git a/arch/nios2/kernel/syscall_table.c b/arch/nios2/kernel/syscall_table.c new file mode 100644 index 0000000..06e6ac1835b2ed93f420a4ab0d1e06911144486b --- /dev/null +++ b/arch/nios2/kernel/syscall_table.c @@ -0,0 +1,29 @@ +/* + * Copyright Altera Corporation (C) 2013. All rights reserved + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + * + */ + +#include <linux/syscalls.h> +#include <linux/signal.h> +#include <linux/unistd.h> + +#include <asm/syscalls.h> + +#undef __SYSCALL +#define __SYSCALL(nr, call) [nr] = (call), + +void *sys_call_table[__NR_syscalls] = { +#include <asm/unistd.h> +}; -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
