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| Rev 3386 | Rev 4153 | ||
|---|---|---|---|
| Line 24... | Line 24... | ||
| 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 | /** @addtogroup ia32 |
29 | /** @addtogroup ia32 |
| 30 | * @{ |
30 | * @{ |
| 31 | */ |
31 | */ |
| 32 | /** @file |
32 | /** @file |
| 33 | */ |
33 | */ |
| 34 | 34 | ||
| Line 110... | Line 110... | ||
| 110 | d->offset_16_31 = offset >> 16; |
110 | d->offset_16_31 = offset >> 16; |
| 111 | } |
111 | } |
| 112 | 112 | ||
| 113 | void tss_initialize(tss_t *t) |
113 | void tss_initialize(tss_t *t) |
| 114 | { |
114 | { |
| 115 | memsetb(t, sizeof(struct tss), 0); |
115 | memsetb(t, sizeof(tss_t), 0); |
| 116 | } |
116 | } |
| 117 | 117 | ||
| 118 | /* |
118 | /* |
| 119 | * This function takes care of proper setup of IDT and IDTR. |
119 | * This function takes care of proper setup of IDT and IDTR. |
| 120 | */ |
120 | */ |
| Line 125... | Line 125... | ||
| 125 | 125 | ||
| 126 | for (i = 0; i < IDT_ITEMS; i++) { |
126 | for (i = 0; i < IDT_ITEMS; i++) { |
| 127 | d = &idt[i]; |
127 | d = &idt[i]; |
| 128 | 128 | ||
| 129 | d->unused = 0; |
129 | d->unused = 0; |
| 130 | d->selector = selector(KTEXT_DES); |
130 | d->selector = gdtselector(KTEXT_DES); |
| 131 | 131 | ||
| 132 | d->access = AR_PRESENT | AR_INTERRUPT; /* masking interrupt */ |
132 | d->access = AR_PRESENT | AR_INTERRUPT; /* masking interrupt */ |
| 133 | 133 | ||
| 134 | if (i == VECTOR_SYSCALL) { |
134 | if (i == VECTOR_SYSCALL) { |
| 135 | /* |
135 | /* |
| Line 152... | Line 152... | ||
| 152 | "pushfl\n" |
152 | "pushfl\n" |
| 153 | "pop %%eax\n" |
153 | "pop %%eax\n" |
| 154 | "and $0xffff8fff, %%eax\n" |
154 | "and $0xffff8fff, %%eax\n" |
| 155 | "push %%eax\n" |
155 | "push %%eax\n" |
| 156 | "popfl\n" |
156 | "popfl\n" |
| 157 | : : : "eax" |
157 | ::: "eax" |
| 158 | ); |
158 | ); |
| 159 | } |
159 | } |
| 160 | 160 | ||
| 161 | /* Clean AM(18) flag in CR0 register */ |
161 | /* Clean AM(18) flag in CR0 register */ |
| 162 | static void clean_AM_flag(void) |
162 | static void clean_AM_flag(void) |
| 163 | { |
163 | { |
| 164 | asm volatile ( |
164 | asm volatile ( |
| 165 | "mov %%cr0, %%eax\n" |
165 | "mov %%cr0, %%eax\n" |
| 166 | "and $0xfffbffff, %%eax\n" |
166 | "and $0xfffbffff, %%eax\n" |
| 167 | "mov %%eax, %%cr0\n" |
167 | "mov %%eax, %%cr0\n" |
| 168 | : : : "eax" |
168 | ::: "eax" |
| 169 | ); |
169 | ); |
| 170 | } |
170 | } |
| 171 | 171 | ||
| 172 | void pm_init(void) |
172 | void pm_init(void) |
| 173 | { |
173 | { |
| Line 196... | Line 196... | ||
| 196 | tss_p = &tss; |
196 | tss_p = &tss; |
| 197 | } |
197 | } |
| 198 | else { |
198 | else { |
| 199 | tss_p = (tss_t *) malloc(sizeof(tss_t), FRAME_ATOMIC); |
199 | tss_p = (tss_t *) malloc(sizeof(tss_t), FRAME_ATOMIC); |
| 200 | if (!tss_p) |
200 | if (!tss_p) |
| 201 | panic("could not allocate TSS\n"); |
201 | panic("Cannot allocate TSS."); |
| 202 | } |
202 | } |
| 203 | 203 | ||
| 204 | tss_initialize(tss_p); |
204 | tss_initialize(tss_p); |
| 205 | 205 | ||
| 206 | gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL; |
206 | gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL; |
| Line 212... | Line 212... | ||
| 212 | 212 | ||
| 213 | /* |
213 | /* |
| 214 | * As of this moment, the current CPU has its own GDT pointing |
214 | * As of this moment, the current CPU has its own GDT pointing |
| 215 | * to its own TSS. We just need to load the TR register. |
215 | * to its own TSS. We just need to load the TR register. |
| 216 | */ |
216 | */ |
| 217 | tr_load(selector(TSS_DES)); |
217 | tr_load(gdtselector(TSS_DES)); |
| 218 | 218 | ||
| 219 | clean_IOPL_NT_flags(); /* Disable I/O on nonprivileged levels and clear NT flag. */ |
219 | clean_IOPL_NT_flags(); /* Disable I/O on nonprivileged levels and clear NT flag. */ |
| 220 | clean_AM_flag(); /* Disable alignment check */ |
220 | clean_AM_flag(); /* Disable alignment check */ |
| 221 | } |
221 | } |
| 222 | 222 | ||