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| 1 | /* |
1 | /* |
| 2 | * Copyright (C) 2006 Ondrej Palkovsky |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
| 3 | * All rights reserved. |
3 | * All rights reserved. |
| 4 | * |
4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
7 | * are met: |
| 8 | * |
8 | * |
| 9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
| 16 | * |
16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
27 | */ |
| 28 | 28 | ||
| - | 29 | /** @addtogroup amd64 |
|
| - | 30 | * @{ |
|
| - | 31 | */ |
|
| - | 32 | /** @file |
|
| - | 33 | */ |
|
| - | 34 | ||
| 29 | #include <syscall/syscall.h> |
35 | #include <syscall/syscall.h> |
| 30 | #include <arch/syscall.h> |
36 | #include <arch/syscall.h> |
| 31 | #include <panic.h> |
37 | #include <panic.h> |
| 32 | #include <arch/cpu.h> |
38 | #include <arch/cpu.h> |
| 33 | #include <arch/pm.h> |
39 | #include <arch/pm.h> |
| 34 | #include <arch/asm.h> |
40 | #include <arch/asm.h> |
| 35 | 41 | ||
| 36 | #include <print.h> |
42 | #include <print.h> |
| 37 | #include <arch/cpu.h> |
43 | #include <arch/cpu.h> |
| 38 | 44 | ||
| 39 | extern void syscall_entry(void); |
45 | extern void syscall_entry(void); |
| 40 | 46 | ||
| 41 | /** Enable & setup support for SYSCALL/SYSRET */ |
47 | /** Enable & setup support for SYSCALL/SYSRET */ |
| 42 | void syscall_setup_cpu(void) |
48 | void syscall_setup_cpu(void) |
| 43 | { |
49 | { |
| 44 | /* Enable SYSCALL/SYSRET */ |
50 | /* Enable SYSCALL/SYSRET */ |
| 45 | set_efer_flag(AMD_SCE_FLAG); |
51 | set_efer_flag(AMD_SCE_FLAG); |
| 46 | 52 | ||
| 47 | /* Setup syscall entry address */ |
53 | /* Setup syscall entry address */ |
| 48 | 54 | ||
| 49 | /* This is _mess_ - the 64-bit CS is argument+16, |
55 | /* This is _mess_ - the 64-bit CS is argument+16, |
| 50 | * the SS is argument+8. The order is: |
56 | * the SS is argument+8. The order is: |
| 51 | * +0(KDATA_DES), +8(UDATA_DES), +16(UTEXT_DES) |
57 | * +0(KDATA_DES), +8(UDATA_DES), +16(UTEXT_DES) |
| 52 | */ |
58 | */ |
| 53 | write_msr(AMD_MSR_STAR, |
59 | write_msr(AMD_MSR_STAR, |
| 54 | ((__u64)(gdtselector(KDATA_DES) | PL_USER)<<48) \ |
60 | ((__u64)(gdtselector(KDATA_DES) | PL_USER)<<48) \ |
| 55 | | ((__u64)(gdtselector(KTEXT_DES) | PL_KERNEL)<<32)); |
61 | | ((__u64)(gdtselector(KTEXT_DES) | PL_KERNEL)<<32)); |
| 56 | write_msr(AMD_MSR_LSTAR, (__u64)syscall_entry); |
62 | write_msr(AMD_MSR_LSTAR, (__u64)syscall_entry); |
| 57 | /* Mask RFLAGS on syscall |
63 | /* Mask RFLAGS on syscall |
| 58 | * - disable interrupts, until we exchange the stack register |
64 | * - disable interrupts, until we exchange the stack register |
| 59 | * (mask the IE bit) |
65 | * (mask the IE bit) |
| 60 | */ |
66 | */ |
| 61 | write_msr(AMD_MSR_SFMASK, 0x200); |
67 | write_msr(AMD_MSR_SFMASK, 0x200); |
| 62 | } |
68 | } |
| - | 69 | ||
| - | 70 | /** @} |
|
| - | 71 | */ |
|
| - | 72 | ||
| 63 | 73 | ||