WebSVN – HelenOS – Diff – /trunk/kernel/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>
 
/*
 * 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) };
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);
 
    /*
     * 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__("ltr %0" : : "r" ((__u16) selector(TSS_DES)));
   
    clean_IOPL_NT_flags();    /* Disable I/O on nonprivileged levels */
    clean_AM_flag();          /* Disable alignment check */
}
 

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

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/ia32/src/pm.c @ 2071 – Rev 144 → 167