| /SPARTAN/trunk/doc/TODO |
|---|
| 12,7 → 12,7 |
| + save/restore floating point context on context switch |
| + [ia32] lazy context switch using TS flag [DONE] |
| + [ia32] MMX,SSE1-.. initialization |
| + [ia32] review privilege separation |
| + [ia32] review privilege separation [DONE] |
| + zero IOPL in EFLAGS [DONE] |
| + before IRET (from SYSCALL), zero NT in EFLAGS [DONE] |
| + [ia32] review the cache controling bits in CR0 register |
| /SPARTAN/trunk/arch/ia32/src/pm.c |
|---|
| 128,7 → 128,7 |
| } |
| // Clean IOPL(12,13) and NT(14) flags in EFLAGS register |
| static void clean_IOPL_NT_flags(void) |
| { |
| asm |
| 144,9 → 144,24 |
| ); |
| } |
| // 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); |
| 185,5 → 200,6 |
| */ |
| __asm__("ltr %0" : : "r" ((__u16) selector(TSS_DES))); |
| clean_IOPL_NT_flags(); |
| clean_IOPL_NT_flags(); //Disable I/O on nonprivileged levels |
| clean_AM_flag(); //Disable alignment check |
| } |