Rev 806 | Rev 959 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 803 | palkovsky | 1 | /* |
| 2 | * Copyright (C) 2006 Ondrej Palkovsky |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 13 | * documentation and/or other materials provided with the distribution. |
||
| 14 | * - The name of the author may not be used to endorse or promote products |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 29 | #include <syscall/syscall.h> |
||
| 30 | #include <arch/syscall.h> |
||
| 31 | #include <panic.h> |
||
| 32 | #include <arch/cpu.h> |
||
| 33 | #include <arch/pm.h> |
||
| 34 | #include <arch/asm.h> |
||
| 35 | |||
| 36 | #include <print.h> |
||
| 806 | palkovsky | 37 | #include <arch/cpu.h> |
| 803 | palkovsky | 38 | |
| 39 | extern void syscall_entry(void); |
||
| 40 | |||
| 41 | /** Enable & setup support for SYSCALL/SYSRET */ |
||
| 42 | void syscall_setup_cpu(void) |
||
| 43 | { |
||
| 44 | /* Enable SYSCALL/SYSRET */ |
||
| 45 | set_efer_flag(AMD_SCE_FLAG); |
||
| 46 | |||
| 47 | /* Setup syscall entry address */ |
||
| 48 | |||
| 49 | /* This is _mess_ - the 64-bit CS is argument+16, |
||
| 50 | * the SS is argument+8. The order is: |
||
| 51 | * +0(KDATA_DES), +8(UDATA_DES), +16(UTEXT_DES) |
||
| 52 | */ |
||
| 53 | write_msr(AMD_MSR_STAR, |
||
| 54 | ((__u64)(gdtselector(KDATA_DES) | PL_USER)<<48) \ |
||
| 55 | | ((__u64)(gdtselector(KTEXT_DES) | PL_KERNEL)<<32)); |
||
| 56 | write_msr(AMD_MSR_LSTAR, (__u64)syscall_entry); |
||
| 57 | /* Mask RFLAGS on syscall |
||
| 806 | palkovsky | 58 | * - disable interrupts, until we exchange the stack register |
| 59 | * (mask the IE bit) |
||
| 803 | palkovsky | 60 | */ |
| 806 | palkovsky | 61 | write_msr(AMD_MSR_SFMASK, 0x200); |
| 803 | palkovsky | 62 | } |
| 63 | |||
| 64 | /** Dispatch system call */ |
||
| 955 | palkovsky | 65 | __native syscall_handler(__native a1, __native a2, __native a3, |
| 66 | __native id) |
||
| 803 | palkovsky | 67 | { |
| 68 | if (id < SYSCALL_END) |
||
| 69 | return syscall_table[id](a1,a2,a3); |
||
| 70 | else |
||
| 71 | panic("Undefined syscall %d", id); |
||
| 72 | } |