kern
annotate src/vm-asm.S @ 33:373a9f50b4e6
8254 timer code
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Wed, 08 Jun 2011 03:02:42 +0300 |
| parents | 5454cee245a3 |
| children | 88a6c4e192f9 |
| rev | line source |
|---|---|
| nuclear@17 | 1 .text |
| nuclear@17 | 2 /* enable_paging(void) |
| nuclear@26 | 3 * sets bit 31 of cr0 which enables page translation */ |
| nuclear@17 | 4 .globl enable_paging |
| nuclear@17 | 5 enable_paging: |
| nuclear@17 | 6 movl %cr0, %eax |
| nuclear@17 | 7 orl $0x80000000, %eax |
| nuclear@17 | 8 movl %eax, %cr0 |
| nuclear@17 | 9 ret |
| nuclear@17 | 10 |
| nuclear@23 | 11 /* disable_paging(void) |
| nuclear@26 | 12 * clears bit 31 of cr0 which disables page translation */ |
| nuclear@23 | 13 .globl disable_paging |
| nuclear@23 | 14 disable_paging: |
| nuclear@23 | 15 movl %cr0, %eax |
| nuclear@23 | 16 andl $0x7fffffff, %eax |
| nuclear@23 | 17 movl %eax, %cr0 |
| nuclear@23 | 18 ret |
| nuclear@23 | 19 |
| nuclear@26 | 20 /* get_paging_status(void) |
| nuclear@26 | 21 * returns 0 if paging is disabled or 1 if it's enabled */ |
| nuclear@23 | 22 .globl get_paging_status |
| nuclear@23 | 23 get_paging_status: |
| nuclear@23 | 24 movl %cr0, %eax |
| nuclear@23 | 25 shr $31, %eax |
| nuclear@23 | 26 ret |
| nuclear@23 | 27 |
| nuclear@17 | 28 /* set_pgdir_addr(uint32_t addr) |
| nuclear@17 | 29 * sets the address of the page directory by writing to cr3, which |
| nuclear@17 | 30 * also results in a TLB flush. */ |
| nuclear@17 | 31 .globl set_pgdir_addr |
| nuclear@17 | 32 set_pgdir_addr: |
| nuclear@17 | 33 movl 4(%esp), %eax |
| nuclear@17 | 34 movl %eax, %cr3 |
| nuclear@17 | 35 ret |
| nuclear@17 | 36 |
| nuclear@23 | 37 /* flush_tlb(void) |
| nuclear@23 | 38 * invalidates the whole TLB. entries for pages marked as global |
| nuclear@23 | 39 * are unaffected */ |
| nuclear@23 | 40 .globl flush_tlb |
| nuclear@23 | 41 flush_tlb: |
| nuclear@23 | 42 movl %cr3, %eax |
| nuclear@23 | 43 movl %eax, %cr3 |
| nuclear@23 | 44 ret |
| nuclear@23 | 45 |
| nuclear@23 | 46 /* flush_tlb_addr(uint32_t addr) |
| nuclear@23 | 47 * flushes the TLB entry for the page containing a particular |
| nuclear@23 | 48 * virtual address */ |
| nuclear@23 | 49 .globl flush_tlb_addr |
| nuclear@23 | 50 flush_tlb_addr: |
| nuclear@23 | 51 movl 4(%esp), %eax |
| nuclear@23 | 52 invlpg (%eax) |
| nuclear@23 | 53 ret |
| nuclear@23 | 54 |
| nuclear@17 | 55 /* get_fault_addr(void) |
| nuclear@17 | 56 * returns the contents of control register 2, which provides |
| nuclear@17 | 57 * the faulting address during a page fault exception |
| nuclear@17 | 58 */ |
| nuclear@17 | 59 .globl get_fault_addr |
| nuclear@17 | 60 get_fault_addr: |
| nuclear@17 | 61 movl %cr2, %eax |
| nuclear@17 | 62 ret |