kern
view src/vm-asm.S @ 80:4db99a52863e
fixed the "endianess" of the text messages in the ATA identify info block. this
is the first time I've seen wrong byteorder in ascii text, the ATA committee
should be commended.
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Tue, 06 Dec 2011 13:35:39 +0200 |
| parents | 387078ef5c0d |
| children |
line source
1 .text
2 /* enable_paging(void)
3 * sets bit 31 of cr0 which enables page translation */
4 .globl enable_paging
5 enable_paging:
6 movl %cr0, %eax
7 orl $0x80000000, %eax
8 movl %eax, %cr0
9 ret
11 /* disable_paging(void)
12 * clears bit 31 of cr0 which disables page translation */
13 .globl disable_paging
14 disable_paging:
15 movl %cr0, %eax
16 andl $0x7fffffff, %eax
17 movl %eax, %cr0
18 ret
20 /* get_paging_status(void)
21 * returns 0 if paging is disabled or 1 if it's enabled */
22 .globl get_paging_status
23 get_paging_status:
24 movl %cr0, %eax
25 shr $31, %eax
26 ret
28 /* set_pgdir_addr(uint32_t addr)
29 * sets the address of the page directory by writing to cr3, which
30 * also results in a TLB flush. */
31 .globl set_pgdir_addr
32 set_pgdir_addr:
33 movl 4(%esp), %eax
34 movl %eax, %cr3
35 ret
37 /* get_pgdir_addr(void)
38 * returns the physical address of the page table directory (cr3) */
39 .globl get_pgdir_addr
40 get_pgdir_addr:
41 movl %cr3, %eax
42 ret
44 /* flush_tlb(void)
45 * invalidates the whole TLB. entries for pages marked as global
46 * are unaffected */
47 .globl flush_tlb
48 flush_tlb:
49 movl %cr3, %eax
50 movl %eax, %cr3
51 ret
53 /* flush_tlb_addr(uint32_t addr)
54 * flushes the TLB entry for the page containing a particular
55 * virtual address */
56 .globl flush_tlb_addr
57 flush_tlb_addr:
58 movl 4(%esp), %eax
59 invlpg (%eax)
60 ret
62 /* get_fault_addr(void)
63 * returns the contents of control register 2, which provides
64 * the faulting address during a page fault exception
65 */
66 .globl get_fault_addr
67 get_fault_addr:
68 movl %cr2, %eax
69 ret