WebSVN – HelenOS – Diff – /tags/0.1.1/kernel/arch/amd64/src/pm.c


/*
 * Copyright (C) 2001-2004 Jakub Jermar
 * Copyright (C) 2005-2006 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 <arch/pm.h>
#include <arch/mm/page.h>
#include <arch/types.h>
#include <arch/interrupt.h>
#include <arch/asm.h>
#include <interrupt.h>
#include <mm/as.h>
 
#include <config.h>
 
#include <memstr.h>
#include <mm/slab.h>
#include <debug.h>
 
/*
 * There is no segmentation in long mode 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.
 */
 
descriptor_t gdt[GDT_ITEMS] = {
    /* NULL descriptor */
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
    /* KTEXT descriptor */
    { .limit_0_15  = 0xffff,
      .base_0_15   = 0,
      .base_16_23  = 0,
      .access      = AR_PRESENT | AR_CODE | DPL_KERNEL | AR_READABLE ,
      .limit_16_19 = 0xf,
      .available   = 0,
      .longmode    = 1,
      .special     = 0,
      .granularity = 1,
      .base_24_31  = 0 },
    /* KDATA descriptor */
    { .limit_0_15  = 0xffff,
      .base_0_15   = 0,
      .base_16_23  = 0,
      .access      = AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_KERNEL,
      .limit_16_19 = 0xf,
      .available   = 0,
      .longmode    = 0,
      .special     = 0,
      .granularity = 1,
      .base_24_31  = 0 },
    /* UDATA descriptor */
    { .limit_0_15  = 0xffff,
      .base_0_15   = 0,
      .base_16_23  = 0,
      .access      = AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_USER,
      .limit_16_19 = 0xf,
      .available   = 0,
      .longmode    = 0,
      .special     = 1,
      .granularity = 1,
      .base_24_31  = 0 },
    /* UTEXT descriptor */
    { .limit_0_15  = 0xffff,
      .base_0_15   = 0,
      .base_16_23  = 0,
      .access      = AR_PRESENT | AR_CODE | DPL_USER,
      .limit_16_19 = 0xf,
      .available   = 0,
      .longmode    = 1,
      .special     = 0,
      .granularity = 1,
      .base_24_31  = 0 },
    /* KTEXT 32-bit protected, for protected mode before long mode */
    { .limit_0_15  = 0xffff,
      .base_0_15   = 0,
      .base_16_23  = 0,
      .access      = AR_PRESENT | AR_CODE | DPL_KERNEL | AR_READABLE,
      .limit_16_19 = 0xf,
      .available   = 0,
      .longmode    = 0,
      .special     = 1,
      .granularity = 1,
      .base_24_31  = 0 },
    /* TSS descriptor - set up will be completed later,
     * on AMD64 it is 64-bit - 2 items in table */
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
    /* VESA Init descriptor */
#ifdef CONFIG_FB    
    { 0xffff, 0, VESA_INIT_SEGMENT>>12, AR_PRESENT | AR_CODE | DPL_KERNEL, 0xf, 0, 0, 0, 0, 0 }
#endif
};
 
idescriptor_t idt[IDT_ITEMS];
 
ptr_16_64_t gdtr = {.limit = sizeof(gdt), .base= (__u64) gdt };
ptr_16_64_t idtr = {.limit = sizeof(idt), .base= (__u64) idt };
 
static tss_t tss;
tss_t *tss_p = NULL;
 
void gdt_tss_setbase(descriptor_t *d, __address base)
{
    tss_descriptor_t *td = (tss_descriptor_t *) d;
 
    td->base_0_15 = base & 0xffff;
    td->base_16_23 = ((base) >> 16) & 0xff;
    td->base_24_31 = ((base) >> 24) & 0xff;
    td->base_32_63 = ((base) >> 32);
}
 
void gdt_tss_setlimit(descriptor_t *d, __u32 limit)
{
    struct tss_descriptor *td = (tss_descriptor_t *) d;
 
    td->limit_0_15 = limit & 0xffff;
    td->limit_16_19 = (limit >> 16) & 0xf;
}
 
void idt_setoffset(idescriptor_t *d, __address offset)
{
    /*
     * Offset is a linear address.
     */
    d->offset_0_15 = offset & 0xffff;
    d->offset_16_31 = offset >> 16 & 0xffff;
    d->offset_32_63 = offset >> 32;
}
 
void tss_initialize(tss_t *t)
{
    memsetb((__address) t, sizeof(tss_t), 0);
}
 
/*
 * This function takes care of proper setup of IDT and IDTR.
 */
void idt_init(void)
{
    idescriptor_t *d;
    int i;
 
    for (i = 0; i < IDT_ITEMS; i++) {
        d = &idt[i];
 
        d->unused = 0;
        d->selector = gdtselector(KTEXT_DES);
 
        d->present = 1;
        d->type = AR_INTERRUPT; /* masking interrupt */
 
        idt_setoffset(d, ((__address) interrupt_handlers) + i*interrupt_handler_size);
        exc_register(i, "undef", (iroutine)null_interrupt);
    }
 
    exc_register( 7, "nm_fault", nm_fault);
    exc_register(12, "ss_fault", ss_fault);
    exc_register(13, "gp_fault", gp_fault);
    exc_register(14, "ident_mapper", ident_page_fault);
}
 
/** Initialize segmentation - code/data/idt tables
 *
 */
void pm_init(void)
{
    descriptor_t *gdt_p = (struct descriptor *) gdtr.base;
    tss_descriptor_t *tss_desc;
 
    /*
     * 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 {
        /* We are going to use malloc, which may return
         * non boot-mapped pointer, initialize the CR3 register
         * ahead of page_init */
        write_cr3((__address) AS_KERNEL->page_table);
 
        tss_p = (struct tss *) malloc(sizeof(tss_t), FRAME_ATOMIC);
        if (!tss_p)
            panic("could not allocate TSS\n");
    }
 
    tss_initialize(tss_p);
 
    tss_desc = (tss_descriptor_t *) (&gdt_p[TSS_DES]);
    tss_desc->present = 1;
    tss_desc->type = AR_TSS;
    tss_desc->dpl = PL_KERNEL;
   
    gdt_tss_setbase(&gdt_p[TSS_DES], (__address) tss_p);
    gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE - 1);
 
    gdtr_load(&gdtr);
    idtr_load(&idtr);
    /*
     * As of this moment, the current CPU has its own GDT pointing
     * to its own TSS. We just need to load the TR register.
     */
    tr_load(gdtselector(TSS_DES));
}
 

Rev 1963	Rev 1968
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
3	* Copyright (C) 2005-2006 Ondrej Palkovsky	3	* Copyright (C) 2005-2006 Ondrej Palkovsky
4	* All rights reserved.	4	* All rights reserved.
5	*	5	*
6	* Redistribution and use in source and binary forms, with or without	6	* Redistribution and use in source and binary forms, with or without
7	* modification, are permitted provided that the following conditions	7	* modification, are permitted provided that the following conditions
8	* are met:	8	* are met:
9	*	9	*
10	* - Redistributions of source code must retain the above copyright	10	* - Redistributions of source code must retain the above copyright
11	* notice, this list of conditions and the following disclaimer.	11	* notice, this list of conditions and the following disclaimer.
12	* - Redistributions in binary form must reproduce the above copyright	12	* - Redistributions in binary form must reproduce the above copyright
13	* notice, this list of conditions and the following disclaimer in the	13	* notice, this list of conditions and the following disclaimer in the
14	* documentation and/or other materials provided with the distribution.	14	* documentation and/or other materials provided with the distribution.
15	* - The name of the author may not be used to endorse or promote products	15	* - The name of the author may not be used to endorse or promote products
16	* derived from this software without specific prior written permission.	16	* derived from this software without specific prior written permission.
17	*	17	*
18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28	*/	28	*/
29		29
30	#include <arch/pm.h>	30	#include <arch/pm.h>
31	#include <arch/mm/page.h>	31	#include <arch/mm/page.h>
32	#include <arch/types.h>	32	#include <arch/types.h>
33	#include <arch/interrupt.h>	33	#include <arch/interrupt.h>
34	#include <arch/asm.h>	34	#include <arch/asm.h>
35	#include <interrupt.h>	35	#include <interrupt.h>
36	#include <mm/as.h>	36	#include <mm/as.h>
37		37
38	#include <config.h>	38	#include <config.h>
39		39
40	#include <memstr.h>	40	#include <memstr.h>
41	#include <mm/slab.h>	41	#include <mm/slab.h>
42	#include <debug.h>	42	#include <debug.h>
43		43
44	/*	44	/*
45	* There is no segmentation in long mode so we set up flat mode. In this	45	* There is no segmentation in long mode so we set up flat mode. In this
46	* mode, we use, for each privilege level, two segments spanning the	46	* mode, we use, for each privilege level, two segments spanning the
47	* whole memory. One is for code and one is for data.	47	* whole memory. One is for code and one is for data.
48	*/	48	*/
49		49
50	descriptor_t gdt[GDT_ITEMS] = {	50	descriptor_t gdt[GDT_ITEMS] = {
51	/* NULL descriptor */	51	/* NULL descriptor */
52	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },	52	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
53	/* KTEXT descriptor */	53	/* KTEXT descriptor */
54	{ .limit_0_15 = 0xffff,	54	{ .limit_0_15 = 0xffff,
55	.base_0_15 = 0,	55	.base_0_15 = 0,
56	.base_16_23 = 0,	56	.base_16_23 = 0,
57	.access = AR_PRESENT \| AR_CODE \| DPL_KERNEL \| AR_READABLE ,	57	.access = AR_PRESENT \| AR_CODE \| DPL_KERNEL \| AR_READABLE ,
58	.limit_16_19 = 0xf,	58	.limit_16_19 = 0xf,
59	.available = 0,	59	.available = 0,
60	.longmode = 1,	60	.longmode = 1,
61	.special = 0,	61	.special = 0,
62	.granularity = 1,	62	.granularity = 1,
63	.base_24_31 = 0 },	63	.base_24_31 = 0 },
64	/* KDATA descriptor */	64	/* KDATA descriptor */
65	{ .limit_0_15 = 0xffff,	65	{ .limit_0_15 = 0xffff,
66	.base_0_15 = 0,	66	.base_0_15 = 0,
67	.base_16_23 = 0,	67	.base_16_23 = 0,
68	.access = AR_PRESENT \| AR_DATA \| AR_WRITABLE \| DPL_KERNEL,	68	.access = AR_PRESENT \| AR_DATA \| AR_WRITABLE \| DPL_KERNEL,
69	.limit_16_19 = 0xf,	69	.limit_16_19 = 0xf,
70	.available = 0,	70	.available = 0,
71	.longmode = 0,	71	.longmode = 0,
72	.special = 0,	72	.special = 0,
73	.granularity = 1,	73	.granularity = 1,
74	.base_24_31 = 0 },	74	.base_24_31 = 0 },
75	/* UDATA descriptor */	75	/* UDATA descriptor */
76	{ .limit_0_15 = 0xffff,	76	{ .limit_0_15 = 0xffff,
77	.base_0_15 = 0,	77	.base_0_15 = 0,
78	.base_16_23 = 0,	78	.base_16_23 = 0,
79	.access = AR_PRESENT \| AR_DATA \| AR_WRITABLE \| DPL_USER,	79	.access = AR_PRESENT \| AR_DATA \| AR_WRITABLE \| DPL_USER,
80	.limit_16_19 = 0xf,	80	.limit_16_19 = 0xf,
81	.available = 0,	81	.available = 0,
82	.longmode = 0,	82	.longmode = 0,
83	.special = 1,	83	.special = 1,
84	.granularity = 1,	84	.granularity = 1,
85	.base_24_31 = 0 },	85	.base_24_31 = 0 },
86	/* UTEXT descriptor */	86	/* UTEXT descriptor */
87	{ .limit_0_15 = 0xffff,	87	{ .limit_0_15 = 0xffff,
88	.base_0_15 = 0,	88	.base_0_15 = 0,
89	.base_16_23 = 0,	89	.base_16_23 = 0,
90	.access = AR_PRESENT \| AR_CODE \| DPL_USER,	90	.access = AR_PRESENT \| AR_CODE \| DPL_USER,
91	.limit_16_19 = 0xf,	91	.limit_16_19 = 0xf,
92	.available = 0,	92	.available = 0,
93	.longmode = 1,	93	.longmode = 1,
94	.special = 0,	94	.special = 0,
95	.granularity = 1,	95	.granularity = 1,
96	.base_24_31 = 0 },	96	.base_24_31 = 0 },
97	/* KTEXT 32-bit protected, for protected mode before long mode */	97	/* KTEXT 32-bit protected, for protected mode before long mode */
98	{ .limit_0_15 = 0xffff,	98	{ .limit_0_15 = 0xffff,
99	.base_0_15 = 0,	99	.base_0_15 = 0,
100	.base_16_23 = 0,	100	.base_16_23 = 0,
101	.access = AR_PRESENT \| AR_CODE \| DPL_KERNEL \| AR_READABLE,	101	.access = AR_PRESENT \| AR_CODE \| DPL_KERNEL \| AR_READABLE,
102	.limit_16_19 = 0xf,	102	.limit_16_19 = 0xf,
103	.available = 0,	103	.available = 0,
104	.longmode = 0,	104	.longmode = 0,
105	.special = 1,	105	.special = 1,
106	.granularity = 1,	106	.granularity = 1,
107	.base_24_31 = 0 },	107	.base_24_31 = 0 },
108	/* TSS descriptor - set up will be completed later,	108	/* TSS descriptor - set up will be completed later,
109	* on AMD64 it is 64-bit - 2 items in table */	109	* on AMD64 it is 64-bit - 2 items in table */
110	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },	110	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
111	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },	111	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
112	/* VESA Init descriptor */	112	/* VESA Init descriptor */
113	#ifdef CONFIG_FB	113	#ifdef CONFIG_FB
114	{ 0xffff, 0, VESA_INIT_SEGMENT>>12, AR_PRESENT \| AR_CODE \| DPL_KERNEL, 0xf, 0, 0, 0, 0, 0 }	114	{ 0xffff, 0, VESA_INIT_SEGMENT>>12, AR_PRESENT \| AR_CODE \| DPL_KERNEL, 0xf, 0, 0, 0, 0, 0 }
115	#endif	115	#endif
116	};	116	};
117		117
118	idescriptor_t idt[IDT_ITEMS];	118	idescriptor_t idt[IDT_ITEMS];
119		119
120	ptr_16_64_t gdtr = {.limit = sizeof(gdt), .base= (__u64) gdt };	120	ptr_16_64_t gdtr = {.limit = sizeof(gdt), .base= (__u64) gdt };
121	ptr_16_64_t idtr = {.limit = sizeof(idt), .base= (__u64) idt };	121	ptr_16_64_t idtr = {.limit = sizeof(idt), .base= (__u64) idt };
122		122
123	static tss_t tss;	123	static tss_t tss;
124	tss_t *tss_p = NULL;	124	tss_t *tss_p = NULL;
125		125
126	void gdt_tss_setbase(descriptor_t *d, __address base)	126	void gdt_tss_setbase(descriptor_t *d, __address base)
127	{	127	{
128	tss_descriptor_t td = (tss_descriptor_t ) d;	128	tss_descriptor_t td = (tss_descriptor_t ) d;
129		129
130	td->base_0_15 = base & 0xffff;	130	td->base_0_15 = base & 0xffff;
131	td->base_16_23 = ((base) >> 16) & 0xff;	131	td->base_16_23 = ((base) >> 16) & 0xff;
132	td->base_24_31 = ((base) >> 24) & 0xff;	132	td->base_24_31 = ((base) >> 24) & 0xff;
133	td->base_32_63 = ((base) >> 32);	133	td->base_32_63 = ((base) >> 32);
134	}	134	}
135		135
136	void gdt_tss_setlimit(descriptor_t *d, __u32 limit)	136	void gdt_tss_setlimit(descriptor_t *d, __u32 limit)
137	{	137	{
138	struct tss_descriptor td = (tss_descriptor_t ) d;	138	struct tss_descriptor td = (tss_descriptor_t ) d;
139		139
140	td->limit_0_15 = limit & 0xffff;	140	td->limit_0_15 = limit & 0xffff;
141	td->limit_16_19 = (limit >> 16) & 0xf;	141	td->limit_16_19 = (limit >> 16) & 0xf;
142	}	142	}
143		143
144	void idt_setoffset(idescriptor_t *d, __address offset)	144	void idt_setoffset(idescriptor_t *d, __address offset)
145	{	145	{
146	/*	146	/*
147	* Offset is a linear address.	147	* Offset is a linear address.
148	*/	148	*/
149	d->offset_0_15 = offset & 0xffff;	149	d->offset_0_15 = offset & 0xffff;
150	d->offset_16_31 = offset >> 16 & 0xffff;	150	d->offset_16_31 = offset >> 16 & 0xffff;
151	d->offset_32_63 = offset >> 32;	151	d->offset_32_63 = offset >> 32;
152	}	152	}
153		153
154	void tss_initialize(tss_t *t)	154	void tss_initialize(tss_t *t)
155	{	155	{
156	memsetb((__address) t, sizeof(tss_t), 0);	156	memsetb((__address) t, sizeof(tss_t), 0);
157	}	157	}
158		158
159	/*	159	/*
160	* This function takes care of proper setup of IDT and IDTR.	160	* This function takes care of proper setup of IDT and IDTR.
161	*/	161	*/
162	void idt_init(void)	162	void idt_init(void)
163	{	163	{
164	idescriptor_t *d;	164	idescriptor_t *d;
165	int i;	165	int i;
166		166
167	for (i = 0; i < IDT_ITEMS; i++) {	167	for (i = 0; i < IDT_ITEMS; i++) {
168	d = &idt[i];	168	d = &idt[i];
169		169
170	d->unused = 0;	170	d->unused = 0;
171	d->selector = gdtselector(KTEXT_DES);	171	d->selector = gdtselector(KTEXT_DES);
172		172
173	d->present = 1;	173	d->present = 1;
174	d->type = AR_INTERRUPT; /* masking interrupt */	174	d->type = AR_INTERRUPT; /* masking interrupt */
175		175
176	idt_setoffset(d, ((__address) interrupt_handlers) + i*interrupt_handler_size);	176	idt_setoffset(d, ((__address) interrupt_handlers) + i*interrupt_handler_size);
177	exc_register(i, "undef", (iroutine)null_interrupt);	177	exc_register(i, "undef", (iroutine)null_interrupt);
178	}	178	}
179		179
180	exc_register( 7, "nm_fault", nm_fault);	180	exc_register( 7, "nm_fault", nm_fault);
181	exc_register(12, "ss_fault", ss_fault);	181	exc_register(12, "ss_fault", ss_fault);
182	exc_register(13, "gp_fault", gp_fault);	182	exc_register(13, "gp_fault", gp_fault);
183	exc_register(14, "ident_mapper", ident_page_fault);	183	exc_register(14, "ident_mapper", ident_page_fault);
184	}	184	}
185		185
186	/** Initialize segmentation - code/data/idt tables	186	/** Initialize segmentation - code/data/idt tables
187	*	187	*
188	*/	188	*/
189	void pm_init(void)	189	void pm_init(void)
190	{	190	{
191	descriptor_t gdt_p = (struct descriptor ) gdtr.base;	191	descriptor_t gdt_p = (struct descriptor ) gdtr.base;
192	tss_descriptor_t *tss_desc;	192	tss_descriptor_t *tss_desc;
193		193
194	/*	194	/*
195	* Each CPU has its private GDT and TSS.	195	* Each CPU has its private GDT and TSS.
196	* All CPUs share one IDT.	196	* All CPUs share one IDT.
197	*/	197	*/
198		198
199	if (config.cpu_active == 1) {	199	if (config.cpu_active == 1) {
200	idt_init();	200	idt_init();
201	/*	201	/*
202	* NOTE: bootstrap CPU has statically allocated TSS, because	202	* NOTE: bootstrap CPU has statically allocated TSS, because
203	* the heap hasn't been initialized so far.	203	* the heap hasn't been initialized so far.
204	*/	204	*/
205	tss_p = &tss;	205	tss_p = &tss;
206	}	206	}
207	else {	207	else {
208	/* We are going to use malloc, which may return	208	/* We are going to use malloc, which may return
209	* non boot-mapped pointer, initialize the CR3 register	209	* non boot-mapped pointer, initialize the CR3 register
210	* ahead of page_init */	210	* ahead of page_init */
211	write_cr3((__address) AS_KERNEL->page_table);	211	write_cr3((__address) AS_KERNEL->page_table);
212		212
213	tss_p = (struct tss *) malloc(sizeof(tss_t), FRAME_ATOMIC);	213	tss_p = (struct tss *) malloc(sizeof(tss_t), FRAME_ATOMIC);
214	if (!tss_p)	214	if (!tss_p)
215	panic("could not allocate TSS\n");	215	panic("could not allocate TSS\n");
216	}	216	}
217		217
218	tss_initialize(tss_p);	218	tss_initialize(tss_p);
219		219
220	tss_desc = (tss_descriptor_t *) (&gdt_p[TSS_DES]);	220	tss_desc = (tss_descriptor_t *) (&gdt_p[TSS_DES]);
221	tss_desc->present = 1;	221	tss_desc->present = 1;
222	tss_desc->type = AR_TSS;	222	tss_desc->type = AR_TSS;
223	tss_desc->dpl = PL_KERNEL;	223	tss_desc->dpl = PL_KERNEL;
224		224
225	gdt_tss_setbase(&gdt_p[TSS_DES], (__address) tss_p);	225	gdt_tss_setbase(&gdt_p[TSS_DES], (__address) tss_p);
226	gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE - 1);	226	gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE - 1);
227		227
228	gdtr_load(&gdtr);	228	gdtr_load(&gdtr);
229	idtr_load(&idtr);	229	idtr_load(&idtr);
230	/*	230	/*
231	* As of this moment, the current CPU has its own GDT pointing	231	* As of this moment, the current CPU has its own GDT pointing
232	* to its own TSS. We just need to load the TR register.	232	* to its own TSS. We just need to load the TR register.
233	*/	233	*/
234	tr_load(gdtselector(TSS_DES));	234	tr_load(gdtselector(TSS_DES));
235	}	235	}
236		236

Subversion Repositories HelenOS

(root)/tags/0.1.1/kernel/arch/amd64/src/pm.c – Rev 1963 → 1968