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| Rev | Author | Line No. | Line |
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| 803 | palkovsky | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2006 Ondrej Palkovsky |
| 803 | palkovsky | 3 | * All rights reserved. |
| 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 | |||
| 1888 | jermar | 29 | /** @addtogroup amd64 |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 803 | palkovsky | 35 | #include <syscall/syscall.h> |
| 36 | #include <arch/syscall.h> |
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| 37 | #include <panic.h> |
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| 38 | #include <arch/cpu.h> |
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| 39 | #include <arch/pm.h> |
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| 40 | #include <arch/asm.h> |
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| 41 | |||
| 42 | #include <print.h> |
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| 806 | palkovsky | 43 | #include <arch/cpu.h> |
| 803 | palkovsky | 44 | |
| 45 | extern void syscall_entry(void); |
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| 46 | |||
| 47 | /** Enable & setup support for SYSCALL/SYSRET */ |
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| 48 | void syscall_setup_cpu(void) |
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| 49 | { |
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| 50 | /* Enable SYSCALL/SYSRET */ |
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| 51 | set_efer_flag(AMD_SCE_FLAG); |
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| 52 | |||
| 53 | /* Setup syscall entry address */ |
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| 54 | |||
| 2606 | jermar | 55 | /* This is _mess_ - the 64-bit CS is argument + 16, |
| 56 | * the SS is argument + 8. The order is: |
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| 803 | palkovsky | 57 | * +0(KDATA_DES), +8(UDATA_DES), +16(UTEXT_DES) |
| 58 | */ |
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| 59 | write_msr(AMD_MSR_STAR, |
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| 2606 | jermar | 60 | ((uint64_t)(gdtselector(KDATA_DES) | PL_USER) << 48) | |
| 61 | ((uint64_t)(gdtselector(KTEXT_DES) | PL_KERNEL) << 32)); |
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| 1780 | jermar | 62 | write_msr(AMD_MSR_LSTAR, (uint64_t)syscall_entry); |
| 803 | palkovsky | 63 | /* Mask RFLAGS on syscall |
| 806 | palkovsky | 64 | * - disable interrupts, until we exchange the stack register |
| 2784 | jermar | 65 | * (mask the IF bit) |
| 66 | * - clear DF so that the string instructions operate in |
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| 67 | * the right direction |
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| 803 | palkovsky | 68 | */ |
| 2784 | jermar | 69 | write_msr(AMD_MSR_SFMASK, RFLAGS_IF | RFLAGS_DF); |
| 803 | palkovsky | 70 | } |
| 1702 | cejka | 71 | |
| 1888 | jermar | 72 | /** @} |
| 1702 | cejka | 73 | */ |