Subversion Repositories HelenOS-historic

Rev

Rev 113 | Rev 141 | Go to most recent revision | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 113 Rev 125
Line 43... Line 43...
43 
 * We have no use for segmentation so we set up flat mode. In this
 43 
 * 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
 44 
 * mode, we use, for each privilege level, two segments spanning the
45 
 * whole memory. One is for code and one is for data.
 45 
 * whole memory. One is for code and one is for data.
46 
 */
 46 
 */
47 
struct descriptor gdt[GDT_ITEMS] = {
 47 
struct descriptor gdt[GDT_ITEMS] = {
48 
    /* NULL descriptor */
 48 
    /* NULL descriptor */
49 
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
 49 
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
50 
    /* KTEXT descriptor */
 50 
    /* KTEXT descriptor */
51 
    { 0xffff, 0, 0, AR_PRESENT | AR_CODE | DPL_KERNEL, 0xf, 0, 0, 1, 1, 0 },
 51 
    { 0xffff, 0, 0, AR_PRESENT | AR_CODE | DPL_KERNEL, 0xf, 0, 0, 1, 1, 0 },
52 
    /* KDATA descriptor */
 52 
    /* KDATA descriptor */
53 
    { 0xffff, 0, 0, AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_KERNEL, 0xf, 0, 0, 1, 1, 0 },
 53 
    { 0xffff, 0, 0, AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_KERNEL, 0xf, 0, 0, 1, 1, 0 },
54 
    /* UTEXT descriptor */
 54 
    /* UTEXT descriptor */
55 
    { 0xffff, 0, 0, AR_PRESENT | AR_CODE | DPL_USER, 0xf, 0, 0, 1, 1, 0 },
 55 
    { 0xffff, 0, 0, AR_PRESENT | AR_CODE | DPL_USER, 0xf, 0, 0, 1, 1, 0 },
56 
    /* UDATA descriptor */
 56 
    /* UDATA descriptor */
57 
    { 0xffff, 0, 0, AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_USER, 0xf, 0, 0, 1, 1, 0 },
 57 
    { 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 */
 58 
    /* TSS descriptor - set up will be completed later */
59 
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
 59 
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
60 
};
 60 
};
61 
 
 61 
 
62 
static struct idescriptor idt[IDT_ITEMS];
 62 
static struct idescriptor idt[IDT_ITEMS];
63 
 
 63 
 
64 
static struct tss tss;
 64 
static struct tss tss;
Line 69... Line 69...
69 
struct ptr_16_32 gdtr __attribute__ ((section ("K_DATA_START"))) = { .limit = sizeof(gdt), .base = KA2PA((__address) gdt) };
 69 
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) };
 70 
struct ptr_16_32 idtr __attribute__ ((section ("K_DATA_START"))) = { .limit = sizeof(idt), .base = KA2PA((__address) idt) };
71 
 
 71 
 
72 
void gdt_setbase(struct descriptor *d, __address base)
 72 
void gdt_setbase(struct descriptor *d, __address base)
73 
{
 73 
{
74 
        d->base_0_15 = base & 0xffff;
 74 
    d->base_0_15 = base & 0xffff;
75 
        d->base_16_23 = ((base) >> 16) & 0xff;
 75 
    d->base_16_23 = ((base) >> 16) & 0xff;
76 
        d->base_24_31 = ((base) >> 24) & 0xff;
 76 
    d->base_24_31 = ((base) >> 24) & 0xff;
77 
 
 - 
 
78 
}
 77 
}
79 
 
 78 
 
80 
void gdt_setlimit(struct descriptor *d, __u32 limit)
 79 
void gdt_setlimit(struct descriptor *d, __u32 limit)
81 
{
 80 
{
82 
        d->limit_0_15 = limit & 0xffff;
 81 
    d->limit_0_15 = limit & 0xffff;
83 
        d->limit_16_19 = (limit >> 16) & 0xf;
 82 
    d->limit_16_19 = (limit >> 16) & 0xf;
84 
}
 83 
}
85 
 
 84 
 
86 
void idt_setoffset(struct idescriptor *d, __address offset)
 85 
void idt_setoffset(struct idescriptor *d, __address offset)
87 
{
 86 
{
88 
    /*
 87 
    /*
Line 102... Line 101...
102 
 */
 101 
 */
103 
void idt_init(void)
 102 
void idt_init(void)
104 
{
 103 
{
105 
    struct idescriptor *d;
 104 
    struct idescriptor *d;
106 
    int i;
 105 
    int i;
107 
   
 106 
 
108 
    for (i = 0; i < IDT_ITEMS; i++) {
 107 
    for (i = 0; i < IDT_ITEMS; i++) {
109 
        d = &idt[i];
 108 
        d = &idt[i];
110 
 
 109 
 
111 
        d->unused = 0;
 110 
        d->unused = 0;
112 
        d->selector = selector(KTEXT_DES);
 111 
        d->selector = selector(KTEXT_DES);