WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/amd64/src/syscall.c


/*
 * 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>
#include <arch/cpu.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
     * - disable interrupts, until we exchange the stack register
     *   (mask the IE bit)
     */
    write_msr(AMD_MSR_SFMASK, 0x200);
}
 
/** Dispatch system call */
__native syscall_handler(__native id, __native a1, __native a2, __native a3)
{
    interrupts_enable();
    if (id < SYSCALL_END)
        return syscall_table[id](a1,a2,a3);
    else
        panic("Undefined syscall %d", id);
    interrupts_disable();
}
 

Rev 803	Rev 806
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	#include <syscall/syscall.h>	29	#include <syscall/syscall.h>
30	#include <arch/syscall.h>	30	#include <arch/syscall.h>
31	#include <panic.h>	31	#include <panic.h>
32	#include <arch/cpu.h>	32	#include <arch/cpu.h>
33	#include <arch/pm.h>	33	#include <arch/pm.h>
34	#include <arch/asm.h>	34	#include <arch/asm.h>
35		35
36	#include <print.h>	36	#include <print.h>
-		37	#include <arch/cpu.h>
37		38
38	extern void syscall_entry(void);	39	extern void syscall_entry(void);
39		40
40	/** Enable & setup support for SYSCALL/SYSRET */	41	/** Enable & setup support for SYSCALL/SYSRET */
41	void syscall_setup_cpu(void)	42	void syscall_setup_cpu(void)
42	{	43	{
43	/* Enable SYSCALL/SYSRET */	44	/* Enable SYSCALL/SYSRET */
44	set_efer_flag(AMD_SCE_FLAG);	45	set_efer_flag(AMD_SCE_FLAG);
45		46
46	/* Setup syscall entry address */	47	/* Setup syscall entry address */
47		48
48	/* This is _mess_ - the 64-bit CS is argument+16,	49	/* This is _mess_ - the 64-bit CS is argument+16,
49	* the SS is argument+8. The order is:	50	* the SS is argument+8. The order is:
50	* +0(KDATA_DES), +8(UDATA_DES), +16(UTEXT_DES)	51	* +0(KDATA_DES), +8(UDATA_DES), +16(UTEXT_DES)
51	*/	52	*/
52	write_msr(AMD_MSR_STAR,	53	write_msr(AMD_MSR_STAR,
53	((__u64)(gdtselector(KDATA_DES) \| PL_USER)<<48) \	54	((__u64)(gdtselector(KDATA_DES) \| PL_USER)<<48) \
54	\| ((__u64)(gdtselector(KTEXT_DES) \| PL_KERNEL)<<32));	55	\| ((__u64)(gdtselector(KTEXT_DES) \| PL_KERNEL)<<32));
55	write_msr(AMD_MSR_LSTAR, (__u64)syscall_entry);	56	write_msr(AMD_MSR_LSTAR, (__u64)syscall_entry);
56	/* Mask RFLAGS on syscall	57	/* Mask RFLAGS on syscall
57	* - we do not care what is in the flags field	58	* - disable interrupts, until we exchange the stack register
-		59	* (mask the IE bit)
58	*/	60	*/
59	write_msr(AMD_MSR_SFMASK, 0);	61	write_msr(AMD_MSR_SFMASK, 0x200);
60	}	62	}
61		63
62	/** Dispatch system call */	64	/** Dispatch system call */
63	__native syscall_handler(__native id, __native a1, __native a2, __native a3)	65	__native syscall_handler(__native id, __native a1, __native a2, __native a3)
64	{	66	{
-		67	interrupts_enable();
65	if (id < SYSCALL_END)	68	if (id < SYSCALL_END)
66	return syscall_table[id](a1,a2,a3);	69	return syscall_table[id](a1,a2,a3);
67	else	70	else
68	panic("Undefined syscall %d", id);	71	panic("Undefined syscall %d", id);
69		72	interrupts_disable();
70	}	73	}
71		74

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/amd64/src/syscall.c – Rev 803 → 806