;----------------------------------------------------------;\r
-; BOS kernel Christoffer Bubach, 2003-2005. ;\r
+; BOS kernel Christoffer Bubach, 2003-2005. ;\r
;----------------------------------------------------------;\r
-; ;\r
-; set/modify IDT entries ;\r
-; ;\r
+; ;\r
+; set/modify IDT entries ;\r
+; ;\r
;----------------------------------------------------------;\r
\r
\r
\r
;--------------------------------------------------;\r
-; set up IDT ;\r
-; in: edi = pointer to "unhandled int"-function. ;\r
+; set up IDT ;\r
+; in: esi = pointer to "unhandled int"-function. ;\r
;--------------------------------------------------;\r
init_idt:\r
- push eax\r
- push ecx\r
+ push eax\r
+ push ecx\r
\r
- mov ecx, 0\r
- .loop: ; loop\r
- mov eax, edi ; and\r
- mov [(0x6c00+ecx)], ax ; set whole IDT\r
- add ecx, 2 ; to one ISR\r
+ xor ecx, ecx\r
+ .l1:\r
+ mov eax, esi ; loop full IDT and\r
+ mov [(0x6c00+ecx)], ax ; set to one ISR\r
+ add ecx, 2\r
\r
- mov dword [(0x6c00+ecx)], 0x8E000008 ; 0x6c00 is where\r
- add ecx, 4 ; we put the IDT\r
+ mov dword [(0x6c00+ecx)], 0x8E000008 ; 0x6c00 is where\r
+ add ecx, 4 ; we put the IDT\r
\r
- mov eax, edi\r
- shr eax, 16\r
- mov [(0x6c00+ecx)], ax\r
- add ecx, 2\r
+ mov eax, esi\r
+ shr eax, 16\r
+ mov [(0x6c00+ecx)], ax\r
+ add ecx, 2\r
\r
- cmp ecx, 0x800 ; 256 ints\r
- jb .loop ; * 8 bytes each\r
+ cmp ecx, 0x800 ; 256 ints\r
+ jb .l1 ; * 8 bytes each\r
\r
- pop ecx\r
- pop eax\r
- ret\r
+ pop ecx\r
+ pop eax\r
+ ret\r
\r
\r
\r
;--------------------------------------;\r
-; modify IDT, set any int ;\r
-; in: cl = int number ;\r
-; edi = int function pointer ;\r
+; modify IDT, set any int ;\r
+; in: cl = int number ;\r
+; edi = int function pointer ;\r
;--------------------------------------;\r
set_int:\r
- push eax\r
- push ecx\r
+ push eax\r
+ push ecx\r
\r
- mov al, 8 ; 8 bytes for each int\r
- mul cl ; cl * al = ax\r
- movzx ecx, ax ; ecx = offset in IDT (1/2 for dword list)\r
- ;;mov [(idt_list+ecx/2)], edi ; add new int to idt entry list\r
- mov dword [(idt_list+ecx)], edi ; add new int to idt entry list\r
+ mov al, 8 ; 8 bytes for each int\r
+ mul cl ; cl * al = ax\r
+ movzx ecx, ax ; ecx = IDT offset\r
+ shr ecx, 1 ; 1/2 for dword list\r
+ mov dword [(idt_list+ecx)], edi ; add to dword int list\r
+ movzx ecx, ax ; ecx = IDT offset\r
\r
- mov eax, edi\r
- mov [(0x6c00+ecx)], ax\r
- add ecx, 2\r
+ mov eax, edi\r
+ mov [(0x6c00+ecx)], ax\r
+ add ecx, 2\r
\r
- mov dword [(0x6c00+ecx)], 0x8E000008\r
- add ecx, 4\r
+ mov dword [(0x6c00+ecx)], 0x8E000008\r
+ add ecx, 4\r
\r
- mov eax, edi\r
- shr eax, 16\r
- mov [(0x6c00+ecx)], ax\r
+ mov eax, edi\r
+ shr eax, 16\r
+ mov [(0x6c00+ecx)], ax\r
\r
- pop ecx\r
- pop eax\r
- ret\r
+ pop ecx\r
+ pop eax\r
+ ret\r
\r
\r
\r
;------------------------------------------------;\r
-; get int address ;\r
-; in: cl = int number ;\r
-; out: esi = address or 0 if none present ;\r
+; get int address ;\r
+; in: cl = int number ;\r
+; out: esi = address or 0 if none present ;\r
;------------------------------------------------;\r
get_int:\r
- push eax\r
+ push eax\r
\r
- mov eax, 4 ; 4 bytes for each address\r
- mul cl ; cl * al = ax\r
- mov esi, idt_list\r
- add esi, eax\r
+ mov eax, 4 ; 4 bytes for each address\r
+ mul cl ; cl * al = ax\r
+ mov esi, idt_list\r
+ add esi, eax\r
\r
- pop eax\r
- ret\r
+ pop eax\r
+ ret\r
\r
\r
\r
\r
;----------------------------------------;\r
-; sets ints from list ;\r
-; in: esi = pointer to int list ;\r
+; sets ints from list ;\r
+; in: esi = pointer to int list ;\r
;----------------------------------------;\r
set_idt_list:\r
- push eax\r
- push edi\r
+ push eax\r
+ push edi\r
\r
- mov ecx, 0\r
- .loop:\r
- lodsd\r
- or eax, eax\r
- jz .next\r
- mov edi, eax\r
- call set_int\r
- .next:\r
- inc ecx\r
- cmp ecx, 0x100\r
- jb .loop\r
+ xor ecx, ecx\r
+ .l1:\r
+ lodsd\r
+ or eax, eax\r
+ jz .next\r
+ mov edi, eax\r
+ call set_int\r
+ .next:\r
+ inc ecx\r
+ cmp ecx, 0x100\r
+ jb .l1\r
\r
- pop edi\r
- pop eax\r
- ret\r
+ pop edi\r
+ pop eax\r
+ ret\r
\r
\r
\r
;------------------------------;\r
; list of idt entries. ;\r
-; 0 = not handled ;\r
+; 0 = not handled ;\r
;------------------------------;\r
-idt_list: dd isr00\r
- dd isr01\r
- dd isr02\r
- dd isr03\r
- dd isr04\r
- dd isr05\r
- dd isr06\r
- dd isr07\r
- dd isr08\r
- dd isr09\r
- dd isr0A\r
- dd isr0B\r
- dd isr0C\r
- dd isr0D\r
- dd isr0E\r
- dd 0\r
- dd isr10\r
- dd isr11\r
- dd isr12\r
- dd isr13\r
- times 12 dd 0 ; 12 unused ints\r
- dd isr20\r
- dd isr21\r
- times 16 dd 0 ; 16 unused ints\r
- dd isr32 ; First free and BOS system interrupt.\r
- times 205 dd 0 ; 205 unused ints
\ No newline at end of file
+idt_list: dd isr00\r
+ dd isr01\r
+ dd isr02\r
+ dd isr03\r
+ dd isr04\r
+ dd isr05\r
+ dd isr06\r
+ dd isr07\r
+ dd isr08\r
+ dd isr09\r
+ dd isr0A\r
+ dd isr0B\r
+ dd isr0C\r
+ dd isr0D\r
+ dd isr0E\r
+ dd 0\r
+ dd isr10\r
+ dd isr11\r
+ dd isr12\r
+ dd isr13\r
+ times 12 dd 0 ; 12 unused ints\r
+ dd isr20\r
+ dd isr21\r
+ times 16 dd 0 ; 16 unused ints\r
+ dd isr32 ; First free and BOS system interrupt.\r
+ times 205 dd 0 ; 205 unused ints
\ No newline at end of file
projects / BOS.git / blobdiff