WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/ia32/src/pm.c


/*
 * Copyright (C) 2001-2004 Jakub Jermar
 * 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 <arch/pm.h>
#include <config.h>
#include <arch/types.h>
#include <typedefs.h>
#include <arch/interrupt.h>
#include <arch/asm.h>
#include <arch/context.h>
#include <panic.h>
#include <arch/mm/page.h>
#include <mm/heap.h>
#include <memstr.h>
#include <arch/boot/boot.h>
 
/*
 * Early ia32 configuration functions and data structures.
 */
 
/*
 * We have no use for segmentation so we set up flat mode. In this
 * mode, we use, for each privilege level, two segments spanning the
 * whole memory. One is for code and one is for data.
 */
struct descriptor gdt[GDT_ITEMS] = {
    /* NULL descriptor */
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
    /* KTEXT descriptor */
    { 0xffff, 0, 0, AR_PRESENT | AR_CODE | DPL_KERNEL, 0xf, 0, 0, 1, 1, 0 },
    /* KDATA descriptor */
    { 0xffff, 0, 0, AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_KERNEL, 0xf, 0, 0, 1, 1, 0 },
    /* UTEXT descriptor */
    { 0xffff, 0, 0, AR_PRESENT | AR_CODE | DPL_USER, 0xf, 0, 0, 1, 1, 0 },
    /* UDATA descriptor */
    { 0xffff, 0, 0, AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_USER, 0xf, 0, 0, 1, 1, 0 },
    /* TSS descriptor - set up will be completed later */
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
};
 
static struct idescriptor idt[IDT_ITEMS];
 
static struct tss tss;
 
struct tss *tss_p = NULL;
 
/* gdtr is changed by kmp before next CPU is initialized */
struct ptr_16_32 gdtr __attribute__ ((section ("K_DATA_START"))) = { .limit = sizeof(gdt), .base = KA2PA((__address) gdt - BOOT_OFFSET) };
struct ptr_16_32 idtr __attribute__ ((section ("K_DATA_START"))) = { .limit = sizeof(idt), .base = KA2PA((__address) idt) };
 
void gdt_setbase(struct descriptor *d, __address base)
{
    d->base_0_15 = base & 0xffff;
    d->base_16_23 = ((base) >> 16) & 0xff;
    d->base_24_31 = ((base) >> 24) & 0xff;
}
 
void gdt_setlimit(struct descriptor *d, __u32 limit)
{
    d->limit_0_15 = limit & 0xffff;
    d->limit_16_19 = (limit >> 16) & 0xf;
}
 
void idt_setoffset(struct idescriptor *d, __address offset)
{
    /*
     * Offset is a linear address.
     */
    d->offset_0_15 = offset & 0xffff;
    d->offset_16_31 = offset >> 16;
}
 
void tss_initialize(struct tss *t)
{
    memsetb((__address) t, sizeof(struct tss), 0);
}
 
/*
 * This function takes care of proper setup of IDT and IDTR.
 */
void idt_init(void)
{
    struct idescriptor *d;
    int i;
 
    for (i = 0; i < IDT_ITEMS; i++) {
        d = &idt[i];
 
        d->unused = 0;
        d->selector = selector(KTEXT_DES);
 
        d->access = AR_PRESENT | AR_INTERRUPT;  /* masking interrupt */
 
        if (i == VECTOR_SYSCALL) {
            /*
             * The syscall interrupt gate must be calleable from userland.
             */
            d->access |= DPL_USER;
        }
       
        idt_setoffset(d, ((__address) interrupt_handlers) + i*interrupt_handler_size);
        trap_register(i, null_interrupt);
    }
    trap_register(13, gp_fault);
    trap_register( 7, nm_fault);
    trap_register(12, ss_fault);
}
 
 
/* Clean IOPL(12,13) and NT(14) flags in EFLAGS register */
static void clean_IOPL_NT_flags(void)
{
    asm
    (
        "pushfl;"
        "pop %%eax;"
        "and $0xffff8fff,%%eax;"
        "push %%eax;"
        "popfl;"
        :
        :
        :"%eax"
    );
}
 
/* Clean AM(18) flag in CR0 register */
static void clean_AM_flag(void)
{
    asm
    (
        "mov %%cr0,%%eax;"
        "and $0xFFFBFFFF,%%eax;"
        "mov %%eax,%%cr0;"
        :
        :
        :"%eax"
    );
}
 
void pm_init(void)
{
    struct descriptor *gdt_p = (struct descriptor *) PA2KA(gdtr.base);
 
 
    /*
     * Update addresses in GDT and IDT to their virtual counterparts.
     */
    gdtr.base = KA2PA(gdtr.base);
    idtr.base = (__address) idt;
    __asm__ volatile ("lgdt %0\n" : : "m" (gdtr));
    __asm__ volatile ("lidt %0\n" : : "m" (idtr)); 
   
    /*
     * Each CPU has its private GDT and TSS.
     * All CPUs share one IDT.
     */
 
    if (config.cpu_active == 1) {
        idt_init();
        /*
         * NOTE: bootstrap CPU has statically allocated TSS, because
         * the heap hasn't been initialized so far.
         */
        tss_p = &tss;
    }
    else {
        tss_p = (struct tss *) malloc(sizeof(struct tss));
        if (!tss_p)
            panic("could not allocate TSS\n");
    }
 
    tss_initialize(tss_p);
   
    gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL;
    gdt_p[TSS_DES].special = 1;
    gdt_p[TSS_DES].granularity = 1;
   
    gdt_setbase(&gdt_p[TSS_DES], (__address) tss_p);
    gdt_setlimit(&gdt_p[TSS_DES], sizeof(struct tss) - 1);
 
    /*
     * As of this moment, the current CPU has its own GDT pointing
     * to its own TSS. We just need to load the TR register.
     */
    __asm__ volatile ("ltr %0" : : "r" ((__u16) selector(TSS_DES)));
   
    clean_IOPL_NT_flags();    /* Disable I/O on nonprivileged levels */
    clean_AM_flag();          /* Disable alignment check */
}
 

Rev 232	Rev 244
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
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 <arch/pm.h>	29	#include <arch/pm.h>
30	#include <config.h>	30	#include <config.h>
31	#include <arch/types.h>	31	#include <arch/types.h>
32	#include <typedefs.h>	32	#include <typedefs.h>
33	#include <arch/interrupt.h>	33	#include <arch/interrupt.h>
34	#include <arch/asm.h>	34	#include <arch/asm.h>
35	#include <arch/context.h>	35	#include <arch/context.h>
36	#include <panic.h>	36	#include <panic.h>
37	#include <arch/mm/page.h>	37	#include <arch/mm/page.h>
38	#include <mm/heap.h>	38	#include <mm/heap.h>
39	#include <memstr.h>	39	#include <memstr.h>
-		40	#include <arch/boot/boot.h>
40		41
41	/*	42	/*
42	* Early ia32 configuration functions and data structures.	43	* Early ia32 configuration functions and data structures.
43	*/	44	*/
44		45
45	/*	46	/*
46	* We have no use for segmentation so we set up flat mode. In this	47	* We have no use for segmentation so we set up flat mode. In this
47	* mode, we use, for each privilege level, two segments spanning the	48	* mode, we use, for each privilege level, two segments spanning the
48	* whole memory. One is for code and one is for data.	49	* whole memory. One is for code and one is for data.
49	*/	50	*/
50	struct descriptor gdt[GDT_ITEMS] = {	51	struct descriptor gdt[GDT_ITEMS] = {
51	/* NULL descriptor */	52	/* NULL descriptor */
52	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },	53	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
53	/* KTEXT descriptor */	54	/* KTEXT descriptor */
54	{ 0xffff, 0, 0, AR_PRESENT \| AR_CODE \| DPL_KERNEL, 0xf, 0, 0, 1, 1, 0 },	55	{ 0xffff, 0, 0, AR_PRESENT \| AR_CODE \| DPL_KERNEL, 0xf, 0, 0, 1, 1, 0 },
55	/* KDATA descriptor */	56	/* KDATA descriptor */
56	{ 0xffff, 0, 0, AR_PRESENT \| AR_DATA \| AR_WRITABLE \| DPL_KERNEL, 0xf, 0, 0, 1, 1, 0 },	57	{ 0xffff, 0, 0, AR_PRESENT \| AR_DATA \| AR_WRITABLE \| DPL_KERNEL, 0xf, 0, 0, 1, 1, 0 },
57	/* UTEXT descriptor */	58	/* UTEXT descriptor */
58	{ 0xffff, 0, 0, AR_PRESENT \| AR_CODE \| DPL_USER, 0xf, 0, 0, 1, 1, 0 },	59	{ 0xffff, 0, 0, AR_PRESENT \| AR_CODE \| DPL_USER, 0xf, 0, 0, 1, 1, 0 },
59	/* UDATA descriptor */	60	/* UDATA descriptor */
60	{ 0xffff, 0, 0, AR_PRESENT \| AR_DATA \| AR_WRITABLE \| DPL_USER, 0xf, 0, 0, 1, 1, 0 },	61	{ 0xffff, 0, 0, AR_PRESENT \| AR_DATA \| AR_WRITABLE \| DPL_USER, 0xf, 0, 0, 1, 1, 0 },
61	/* TSS descriptor - set up will be completed later */	62	/* TSS descriptor - set up will be completed later */
62	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }	63	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
63	};	64	};
64		65
65	static struct idescriptor idt[IDT_ITEMS];	66	static struct idescriptor idt[IDT_ITEMS];
66		67
67	static struct tss tss;	68	static struct tss tss;
68		69
69	struct tss *tss_p = NULL;	70	struct tss *tss_p = NULL;
70		71
71	/* gdtr is changed by kmp before next CPU is initialized */	72	/* gdtr is changed by kmp before next CPU is initialized */
72	struct ptr_16_32 gdtr __attribute__ ((section ("K_DATA_START"))) = { .limit = sizeof(gdt), .base = KA2PA((__address) gdt) };	73	struct ptr_16_32 gdtr __attribute__ ((section ("K_DATA_START"))) = { .limit = sizeof(gdt), .base = KA2PA((__address) gdt - BOOT_OFFSET) };
73	struct ptr_16_32 idtr __attribute__ ((section ("K_DATA_START"))) = { .limit = sizeof(idt), .base = KA2PA((__address) idt) };	74	struct ptr_16_32 idtr __attribute__ ((section ("K_DATA_START"))) = { .limit = sizeof(idt), .base = KA2PA((__address) idt) };
74		75
75	void gdt_setbase(struct descriptor *d, __address base)	76	void gdt_setbase(struct descriptor *d, __address base)
76	{	77	{
77	d->base_0_15 = base & 0xffff;	78	d->base_0_15 = base & 0xffff;
78	d->base_16_23 = ((base) >> 16) & 0xff;	79	d->base_16_23 = ((base) >> 16) & 0xff;
79	d->base_24_31 = ((base) >> 24) & 0xff;	80	d->base_24_31 = ((base) >> 24) & 0xff;
80	}	81	}
81		82
82	void gdt_setlimit(struct descriptor *d, __u32 limit)	83	void gdt_setlimit(struct descriptor *d, __u32 limit)
83	{	84	{
84	d->limit_0_15 = limit & 0xffff;	85	d->limit_0_15 = limit & 0xffff;
85	d->limit_16_19 = (limit >> 16) & 0xf;	86	d->limit_16_19 = (limit >> 16) & 0xf;
86	}	87	}
87		88
88	void idt_setoffset(struct idescriptor *d, __address offset)	89	void idt_setoffset(struct idescriptor *d, __address offset)
89	{	90	{
90	/*	91	/*
91	* Offset is a linear address.	92	* Offset is a linear address.
92	*/	93	*/
93	d->offset_0_15 = offset & 0xffff;	94	d->offset_0_15 = offset & 0xffff;
94	d->offset_16_31 = offset >> 16;	95	d->offset_16_31 = offset >> 16;
95	}	96	}
96		97
97	void tss_initialize(struct tss *t)	98	void tss_initialize(struct tss *t)
98	{	99	{
99	memsetb((__address) t, sizeof(struct tss), 0);	100	memsetb((__address) t, sizeof(struct tss), 0);
100	}	101	}
101		102
102	/*	103	/*
103	* This function takes care of proper setup of IDT and IDTR.	104	* This function takes care of proper setup of IDT and IDTR.
104	*/	105	*/
105	void idt_init(void)	106	void idt_init(void)
106	{	107	{
107	struct idescriptor *d;	108	struct idescriptor *d;
108	int i;	109	int i;
109		110
110	for (i = 0; i < IDT_ITEMS; i++) {	111	for (i = 0; i < IDT_ITEMS; i++) {
111	d = &idt[i];	112	d = &idt[i];
112		113
113	d->unused = 0;	114	d->unused = 0;
114	d->selector = selector(KTEXT_DES);	115	d->selector = selector(KTEXT_DES);
115		116
116	d->access = AR_PRESENT \| AR_INTERRUPT; /* masking interrupt */	117	d->access = AR_PRESENT \| AR_INTERRUPT; /* masking interrupt */
117		118
118	if (i == VECTOR_SYSCALL) {	119	if (i == VECTOR_SYSCALL) {
119	/*	120	/*
120	* The syscall interrupt gate must be calleable from userland.	121	* The syscall interrupt gate must be calleable from userland.
121	*/	122	*/
122	d->access \|= DPL_USER;	123	d->access \|= DPL_USER;
123	}	124	}
124		125
125	idt_setoffset(d, ((__address) interrupt_handlers) + i*interrupt_handler_size);	126	idt_setoffset(d, ((__address) interrupt_handlers) + i*interrupt_handler_size);
126	trap_register(i, null_interrupt);	127	trap_register(i, null_interrupt);
127	}	128	}
128	trap_register(13, gp_fault);	129	trap_register(13, gp_fault);
129	trap_register( 7, nm_fault);	130	trap_register( 7, nm_fault);
130	trap_register(12, ss_fault);	131	trap_register(12, ss_fault);
131	}	132	}
132		133
133		134
134	/* Clean IOPL(12,13) and NT(14) flags in EFLAGS register */	135	/* Clean IOPL(12,13) and NT(14) flags in EFLAGS register */
135	static void clean_IOPL_NT_flags(void)	136	static void clean_IOPL_NT_flags(void)
136	{	137	{
137	asm	138	asm
138	(	139	(
139	"pushfl;"	140	"pushfl;"
140	"pop %%eax;"	141	"pop %%eax;"
141	"and $0xffff8fff,%%eax;"	142	"and $0xffff8fff,%%eax;"
142	"push %%eax;"	143	"push %%eax;"
143	"popfl;"	144	"popfl;"
144	:	145	:
145	:	146	:
146	:"%eax"	147	:"%eax"
147	);	148	);
148	}	149	}
149		150
150	/* Clean AM(18) flag in CR0 register */	151	/* Clean AM(18) flag in CR0 register */
151	static void clean_AM_flag(void)	152	static void clean_AM_flag(void)
152	{	153	{
153	asm	154	asm
154	(	155	(
155	"mov %%cr0,%%eax;"	156	"mov %%cr0,%%eax;"
156	"and $0xFFFBFFFF,%%eax;"	157	"and $0xFFFBFFFF,%%eax;"
157	"mov %%eax,%%cr0;"	158	"mov %%eax,%%cr0;"
158	:	159	:
159	:	160	:
160	:"%eax"	161	:"%eax"
161	);	162	);
162	}	163	}
163		164
164	void pm_init(void)	165	void pm_init(void)
165	{	166	{
166	struct descriptor gdt_p = (struct descriptor ) PA2KA(gdtr.base);	167	struct descriptor gdt_p = (struct descriptor ) PA2KA(gdtr.base);
167		168
168		169
169	/*	170	/*
170	* Update addresses in GDT and IDT to their virtual counterparts.	171	* Update addresses in GDT and IDT to their virtual counterparts.
171	*/	172	*/
172	gdtr.base = KA2PA(gdtr.base);	173	gdtr.base = KA2PA(gdtr.base);
173	idtr.base = (__address) idt;	174	idtr.base = (__address) idt;
174	__asm__ volatile ("lgdt %0\n" : : "m" (gdtr));	175	__asm__ volatile ("lgdt %0\n" : : "m" (gdtr));
175	__asm__ volatile ("lidt %0\n" : : "m" (idtr));	176	__asm__ volatile ("lidt %0\n" : : "m" (idtr));
176		177
177	/*	178	/*
178	* Each CPU has its private GDT and TSS.	179	* Each CPU has its private GDT and TSS.
179	* All CPUs share one IDT.	180	* All CPUs share one IDT.
180	*/	181	*/
181		182
182	if (config.cpu_active == 1) {	183	if (config.cpu_active == 1) {
183	idt_init();	184	idt_init();
184	/*	185	/*
185	* NOTE: bootstrap CPU has statically allocated TSS, because	186	* NOTE: bootstrap CPU has statically allocated TSS, because
186	* the heap hasn't been initialized so far.	187	* the heap hasn't been initialized so far.
187	*/	188	*/
188	tss_p = &tss;	189	tss_p = &tss;
189	}	190	}
190	else {	191	else {
191	tss_p = (struct tss *) malloc(sizeof(struct tss));	192	tss_p = (struct tss *) malloc(sizeof(struct tss));
192	if (!tss_p)	193	if (!tss_p)
193	panic("could not allocate TSS\n");	194	panic("could not allocate TSS\n");
194	}	195	}
195		196
196	tss_initialize(tss_p);	197	tss_initialize(tss_p);
197		198
198	gdt_p[TSS_DES].access = AR_PRESENT \| AR_TSS \| DPL_KERNEL;	199	gdt_p[TSS_DES].access = AR_PRESENT \| AR_TSS \| DPL_KERNEL;
199	gdt_p[TSS_DES].special = 1;	200	gdt_p[TSS_DES].special = 1;
200	gdt_p[TSS_DES].granularity = 1;	201	gdt_p[TSS_DES].granularity = 1;
201		202
202	gdt_setbase(&gdt_p[TSS_DES], (__address) tss_p);	203	gdt_setbase(&gdt_p[TSS_DES], (__address) tss_p);
203	gdt_setlimit(&gdt_p[TSS_DES], sizeof(struct tss) - 1);	204	gdt_setlimit(&gdt_p[TSS_DES], sizeof(struct tss) - 1);
204		205
205	/*	206	/*
206	* As of this moment, the current CPU has its own GDT pointing	207	* As of this moment, the current CPU has its own GDT pointing
207	* to its own TSS. We just need to load the TR register.	208	* to its own TSS. We just need to load the TR register.
208	*/	209	*/
209	__asm__ volatile ("ltr %0" : : "r" ((__u16) selector(TSS_DES)));	210	__asm__ volatile ("ltr %0" : : "r" ((__u16) selector(TSS_DES)));
210		211
211	clean_IOPL_NT_flags(); /* Disable I/O on nonprivileged levels */	212	clean_IOPL_NT_flags(); /* Disable I/O on nonprivileged levels */
212	clean_AM_flag(); /* Disable alignment check */	213	clean_AM_flag(); /* Disable alignment check */
213	}	214	}
214		215

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/src/pm.c @ 1749 – Rev 232 → 244