| 0,0 → 1,70 |
|---|
| /* |
| * Copyright (C) 2006 Ondrej Palkovsky |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <syscall/syscall.h> |
| #include <arch/syscall.h> |
| #include <panic.h> |
| #include <arch/cpu.h> |
| #include <arch/pm.h> |
| #include <arch/asm.h> |
| |
| #include <print.h> |
| |
| extern void syscall_entry(void); |
| |
| /** Enable & setup support for SYSCALL/SYSRET */ |
| void syscall_setup_cpu(void) |
| { |
| /* Enable SYSCALL/SYSRET */ |
| set_efer_flag(AMD_SCE_FLAG); |
| |
| /* Setup syscall entry address */ |
| |
| /* This is _mess_ - the 64-bit CS is argument+16, |
| * the SS is argument+8. The order is: |
| * +0(KDATA_DES), +8(UDATA_DES), +16(UTEXT_DES) |
| */ |
| write_msr(AMD_MSR_STAR, |
| ((__u64)(gdtselector(KDATA_DES) | PL_USER)<<48) \ |
| | ((__u64)(gdtselector(KTEXT_DES) | PL_KERNEL)<<32)); |
| write_msr(AMD_MSR_LSTAR, (__u64)syscall_entry); |
| /* Mask RFLAGS on syscall |
| * - we do not care what is in the flags field |
| */ |
| write_msr(AMD_MSR_SFMASK, 0); |
| } |
| |
| /** Dispatch system call */ |
| __native syscall_handler(__native id, __native a1, __native a2, __native a3) |
| { |
| if (id < SYSCALL_END) |
| return syscall_table[id](a1,a2,a3); |
| else |
| panic("Undefined syscall %d", id); |
| |
| } |