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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/ia64/kernel/sys_ia64.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/ia64/kernel/sys_ia64.c')
-rw-r--r-- | arch/ia64/kernel/sys_ia64.c | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/arch/ia64/kernel/sys_ia64.c b/arch/ia64/kernel/sys_ia64.c new file mode 100644 index 0000000..3ac216e --- /dev/null +++ b/arch/ia64/kernel/sys_ia64.c @@ -0,0 +1,298 @@ +/* + * This file contains various system calls that have different calling + * conventions on different platforms. + * + * Copyright (C) 1999-2000, 2002-2003, 2005 Hewlett-Packard Co + * David Mosberger-Tang <davidm@hpl.hp.com> + */ +#include <linux/config.h> +#include <linux/errno.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/mman.h> +#include <linux/sched.h> +#include <linux/shm.h> +#include <linux/file.h> /* doh, must come after sched.h... */ +#include <linux/smp.h> +#include <linux/smp_lock.h> +#include <linux/syscalls.h> +#include <linux/highuid.h> +#include <linux/hugetlb.h> + +#include <asm/shmparam.h> +#include <asm/uaccess.h> + +unsigned long +arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len, + unsigned long pgoff, unsigned long flags) +{ + long map_shared = (flags & MAP_SHARED); + unsigned long start_addr, align_mask = PAGE_SIZE - 1; + struct mm_struct *mm = current->mm; + struct vm_area_struct *vma; + + if (len > RGN_MAP_LIMIT) + return -ENOMEM; + +#ifdef CONFIG_HUGETLB_PAGE + if (REGION_NUMBER(addr) == REGION_HPAGE) + addr = 0; +#endif + if (!addr) + addr = mm->free_area_cache; + + if (map_shared && (TASK_SIZE > 0xfffffffful)) + /* + * For 64-bit tasks, align shared segments to 1MB to avoid potential + * performance penalty due to virtual aliasing (see ASDM). For 32-bit + * tasks, we prefer to avoid exhausting the address space too quickly by + * limiting alignment to a single page. + */ + align_mask = SHMLBA - 1; + + full_search: + start_addr = addr = (addr + align_mask) & ~align_mask; + + for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { + /* At this point: (!vma || addr < vma->vm_end). */ + if (TASK_SIZE - len < addr || RGN_MAP_LIMIT - len < REGION_OFFSET(addr)) { + if (start_addr != TASK_UNMAPPED_BASE) { + /* Start a new search --- just in case we missed some holes. */ + addr = TASK_UNMAPPED_BASE; + goto full_search; + } + return -ENOMEM; + } + if (!vma || addr + len <= vma->vm_start) { + /* Remember the address where we stopped this search: */ + mm->free_area_cache = addr + len; + return addr; + } + addr = (vma->vm_end + align_mask) & ~align_mask; + } +} + +asmlinkage long +ia64_getpriority (int which, int who) +{ + long prio; + + prio = sys_getpriority(which, who); + if (prio >= 0) { + force_successful_syscall_return(); + prio = 20 - prio; + } + return prio; +} + +/* XXX obsolete, but leave it here until the old libc is gone... */ +asmlinkage unsigned long +sys_getpagesize (void) +{ + return PAGE_SIZE; +} + +asmlinkage unsigned long +ia64_shmat (int shmid, void __user *shmaddr, int shmflg) +{ + unsigned long raddr; + int retval; + + retval = do_shmat(shmid, shmaddr, shmflg, &raddr); + if (retval < 0) + return retval; + + force_successful_syscall_return(); + return raddr; +} + +asmlinkage unsigned long +ia64_brk (unsigned long brk) +{ + unsigned long rlim, retval, newbrk, oldbrk; + struct mm_struct *mm = current->mm; + + /* + * Most of this replicates the code in sys_brk() except for an additional safety + * check and the clearing of r8. However, we can't call sys_brk() because we need + * to acquire the mmap_sem before we can do the test... + */ + down_write(&mm->mmap_sem); + + if (brk < mm->end_code) + goto out; + newbrk = PAGE_ALIGN(brk); + oldbrk = PAGE_ALIGN(mm->brk); + if (oldbrk == newbrk) + goto set_brk; + + /* Always allow shrinking brk. */ + if (brk <= mm->brk) { + if (!do_munmap(mm, newbrk, oldbrk-newbrk)) + goto set_brk; + goto out; + } + + /* Check against unimplemented/unmapped addresses: */ + if ((newbrk - oldbrk) > RGN_MAP_LIMIT || REGION_OFFSET(newbrk) > RGN_MAP_LIMIT) + goto out; + + /* Check against rlimit.. */ + rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur; + if (rlim < RLIM_INFINITY && brk - mm->start_data > rlim) + goto out; + + /* Check against existing mmap mappings. */ + if (find_vma_intersection(mm, oldbrk, newbrk+PAGE_SIZE)) + goto out; + + /* Ok, looks good - let it rip. */ + if (do_brk(oldbrk, newbrk-oldbrk) != oldbrk) + goto out; +set_brk: + mm->brk = brk; +out: + retval = mm->brk; + up_write(&mm->mmap_sem); + force_successful_syscall_return(); + return retval; +} + +/* + * On IA-64, we return the two file descriptors in ret0 and ret1 (r8 + * and r9) as this is faster than doing a copy_to_user(). + */ +asmlinkage long +sys_pipe (void) +{ + struct pt_regs *regs = ia64_task_regs(current); + int fd[2]; + int retval; + + retval = do_pipe(fd); + if (retval) + goto out; + retval = fd[0]; + regs->r9 = fd[1]; + out: + return retval; +} + +static inline unsigned long +do_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, unsigned long pgoff) +{ + unsigned long roff; + struct file *file = NULL; + + flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); + if (!(flags & MAP_ANONYMOUS)) { + file = fget(fd); + if (!file) + return -EBADF; + + if (!file->f_op || !file->f_op->mmap) { + addr = -ENODEV; + goto out; + } + } + + /* + * A zero mmap always succeeds in Linux, independent of whether or not the + * remaining arguments are valid. + */ + if (len == 0) + goto out; + + /* Careful about overflows.. */ + len = PAGE_ALIGN(len); + if (!len || len > TASK_SIZE) { + addr = -EINVAL; + goto out; + } + + /* + * Don't permit mappings into unmapped space, the virtual page table of a region, + * or across a region boundary. Note: RGN_MAP_LIMIT is equal to 2^n-PAGE_SIZE + * (for some integer n <= 61) and len > 0. + */ + roff = REGION_OFFSET(addr); + if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len))) { + addr = -EINVAL; + goto out; + } + + down_write(¤t->mm->mmap_sem); + addr = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); + up_write(¤t->mm->mmap_sem); + +out: if (file) + fput(file); + return addr; +} + +/* + * mmap2() is like mmap() except that the offset is expressed in units + * of PAGE_SIZE (instead of bytes). This allows to mmap2() (pieces + * of) files that are larger than the address space of the CPU. + */ +asmlinkage unsigned long +sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff) +{ + addr = do_mmap2(addr, len, prot, flags, fd, pgoff); + if (!IS_ERR((void *) addr)) + force_successful_syscall_return(); + return addr; +} + +asmlinkage unsigned long +sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off) +{ + if (offset_in_page(off) != 0) + return -EINVAL; + + addr = do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT); + if (!IS_ERR((void *) addr)) + force_successful_syscall_return(); + return addr; +} + +asmlinkage unsigned long +ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, + unsigned long new_addr) +{ + extern unsigned long do_mremap (unsigned long addr, + unsigned long old_len, + unsigned long new_len, + unsigned long flags, + unsigned long new_addr); + + down_write(¤t->mm->mmap_sem); + { + addr = do_mremap(addr, old_len, new_len, flags, new_addr); + } + up_write(¤t->mm->mmap_sem); + + if (IS_ERR((void *) addr)) + return addr; + + force_successful_syscall_return(); + return addr; +} + +#ifndef CONFIG_PCI + +asmlinkage long +sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, + void *buf) +{ + return -ENOSYS; +} + +asmlinkage long +sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, + void *buf) +{ + return -ENOSYS; +} + +#endif /* CONFIG_PCI */ |