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