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); |
|
} |