Import backup from 2004-03-12
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@@ -0,0 +1,510 @@
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; asmfuncs.asm
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; Josh Holtrop
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; Created: 10/23/03
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; Modified: 02/26/04
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[extern putc]
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[extern console_memory]
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[extern cursorPosition]
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[extern video_drawConsole]
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[extern videoMode]
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%macro jzfar 1
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jnz %%skip
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jmp %1
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%%skip:
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%endmacro
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;stores the parameter to the CR0 register
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;extern dword write_cr0(dword cr0);
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[global write_cr0]
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write_cr0:
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push ebp
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mov ebp, esp
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mov eax, [ebp+8]
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mov cr0, eax
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pop ebp
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ret
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;returns the value in the CR0 register
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;extern dword read_cr0();
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[global read_cr0]
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read_cr0:
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mov eax, cr0;
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ret
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;stores the parameter to the CR3 register
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;extern dword write_cr3(dword cr3);
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[global write_cr3]
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write_cr3:
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push ebp
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mov ebp, esp
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mov eax, [ebp+8]
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mov cr3, eax
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pop ebp
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ret
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;returns the value in the CR2 register
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;extern dword read_cr2();
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[global read_cr2]
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read_cr2:
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mov eax, cr2;
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ret
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;returns the value in the CR3 register
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;extern dword read_cr3();
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[global read_cr3]
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read_cr3:
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mov eax, cr3;
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ret
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;compares one string to another
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;returns 0 if the strings are different
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;extern dword strcmp(char *str1, char *str2);
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[global strcmp]
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strcmp:
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push ebp
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mov ebp, esp
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push esi
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push edi
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mov esi, [ebp+8]
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mov edi, [ebp+12]
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strcmp_loop1:
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lodsb
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mov ah, [edi]
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inc edi
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cmp ah, al
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jnz strcmp_ne
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or al, al
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jz strcmp_e
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jmp strcmp_loop1
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strcmp_e:
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mov eax, 1
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jmp short strcmp_done
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strcmp_ne:
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xor eax, eax
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strcmp_done:
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pop edi
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pop esi
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pop ebp
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ret
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;copies a string from the source to the destination parameter
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;extern void strcpy(char *dest, char *src);
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[global strcpy]
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strcpy:
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push ebp
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mov ebp, esp
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push esi
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push edi
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mov edi, [ebp+8]
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mov esi, [ebp+12]
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strcpyloop:
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lodsb
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stosb
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or al, al
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jnz strcpyloop
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pop edi
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pop esi
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pop ebp
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ret
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;copies memory of n bytes from src to destination
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;void memcpy(void *dest, void *src, dword n);
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[global memcpy]
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memcpy:
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push ebp
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mov ebp, esp
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push esi
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push edi
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push ecx
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mov edi, [ebp+8]
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mov esi, [ebp+12]
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mov ecx, [ebp+16]
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cld
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rep movsb
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pop ecx
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pop edi
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pop esi
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pop ebp
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ret
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;copies memory of n dwords (n*4 bytes) from src to destination
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;void memcpyd(void *dest, void *src, dword n);
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[global memcpyd]
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memcpyd:
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push ebp
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mov ebp, esp
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push esi
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push edi
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push ecx
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mov edi, [ebp+8]
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mov esi, [ebp+12]
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mov ecx, [ebp+16]
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cld
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rep movsd
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pop ecx
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pop edi
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pop esi
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pop ebp
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ret
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;sets num bytes at buffer to the value of c
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;void *memset(void *buffer, int c, int num);
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[global memset]
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memset:
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push ebp
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mov ebp, esp
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push edi
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push ecx
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mov edi, [ebp+8]
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push edi ;save for return address
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mov eax, [ebp+12]
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mov ecx, [ebp+16]
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rep stosb
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pop eax
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pop ecx
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pop edi
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pop ebp
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ret
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;sets num words at buffer to the value of c
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;void *memsetw(void *buffer, int c, int num);
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[global memsetw]
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memsetw:
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push ebp
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mov ebp, esp
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push edi
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push ecx
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mov edi, [ebp+8]
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push edi ;save for return address
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mov eax, [ebp+12]
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mov ecx, [ebp+16]
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rep stosw
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pop eax
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pop ecx
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pop edi
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pop ebp
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ret
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;sets num dwords at buffer to the value of c
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;void *memsetd(void *buffer, int c, int num);
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[global memsetd]
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memsetd:
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push ebp
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mov ebp, esp
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push edi
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push ecx
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mov edi, [ebp+8]
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push edi ;save for return address
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mov eax, [ebp+12]
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mov ecx, [ebp+16]
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rep stosd
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pop eax
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pop ecx
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pop edi
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pop ebp
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ret
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;returns the number of characters in a string
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;extern dword strlen(char *str);
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[global strlen]
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strlen:
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push ebp
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mov ebp, esp
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push esi
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push ebx
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mov esi, [ebp+8]
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xor ebx, ebx
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strlenloop:
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lodsb
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or al, al
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jz strlendone
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inc ebx
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jmp strlenloop
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strlendone:
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mov eax, ebx
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pop ebx
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pop esi
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pop ebp
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ret
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;this function invalidates the page directory/table entry that
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; would be used to access the memory address given in the parameter
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;extern void invlpg_(dword addr);
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[global invlpg_]
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invlpg_:
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mov eax, [esp+4]
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invlpg [eax]
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ret
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;
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;void writeCursorPosition(word pos)
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;
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[global writeCursorPosition]
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writeCursorPosition:
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push ebp
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mov ebp, esp
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push eax
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push ebx
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push edx
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mov eax, [ebp+8] ;cursor position in ax
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mov bl, al
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mov dx, 0x03D4
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mov al, 0x0E
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out dx, al
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inc dx
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mov al, ah
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out dx, al
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dec dx
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mov al, 0x0F
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out dx, al
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inc dx
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mov al, bl
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out dx, al
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pop edx
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pop ebx
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pop eax
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pop ebp
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ret
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;
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;word getCursorPosition()
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;
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[global getCursorPosition]
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getCursorPosition:
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push ebx
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push edx
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xor eax, eax
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mov dx, 0x03D4
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mov al, 0x0E
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out dx, al
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inc dx
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in al, dx
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mov bl, al
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dec dx
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mov al, 0x0F
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out dx, al
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inc dx
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in al, dx
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mov ah, bl
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pop edx
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pop ebx
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ret
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;
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;int puts(char *str)
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;
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[global puts]
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puts:
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push ebp
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mov ebp, esp
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push esi
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push eax
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mov esi, [ebp+8] ;esi = to string
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puts_loop:
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lodsb
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cmp al, 0
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jz puts_done
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push eax
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call putc
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add esp, 4
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jmp puts_loop
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puts_done:
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pop eax
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pop esi
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pop ebp
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ret
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[global putDecu]
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putDecu:
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push ebp
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mov ebp, esp
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sub esp, 24
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mov DWORD [ebp-4], 1
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mov BYTE [ebp-5], 0
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L2:
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mov edx, DWORD [ebp+8]
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mov eax, -858993459
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mul edx
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mov eax, edx
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shr eax, 3
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cmp eax, DWORD [ebp-4]
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jae L4
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jmp L3
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L4:
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mov eax, DWORD [ebp-4]
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mov edx, eax
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sal edx, 2
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add edx, eax
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lea eax, [edx+edx]
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mov DWORD [ebp-4], eax
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jmp L2
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L3:
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nop
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L5:
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cmp DWORD [ebp-4], 1
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ja L7
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jmp L6
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L7:
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mov edx, DWORD [ebp+8]
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mov eax, edx
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mov edx, 0
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div DWORD [ebp-4]
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mov DWORD [ebp-12], eax
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mov al, BYTE [ebp-12]
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mov BYTE [ebp-5], al
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mov eax, 0
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mov al, BYTE [ebp-5]
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imul eax, DWORD [ebp-4]
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sub DWORD [ebp+8], eax
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mov edx, DWORD [ebp-4]
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mov eax, -858993459
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mul edx
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mov eax, edx
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shr eax, 3
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mov DWORD [ebp-4], eax
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lea eax, [ebp-5]
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add BYTE [eax], 48
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sub esp, 12
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mov eax, 0
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mov al, BYTE [ebp-5]
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push eax
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call putc
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add esp, 16
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jmp L5
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L6:
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sub esp, 12
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mov al, BYTE [ebp+8]
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add eax, 48
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and eax, 255
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push eax
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call putc
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add esp, 16
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leave
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ret
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[global putDec]
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putDec:
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push ebp
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mov ebp, esp
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sub esp, 24
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cmp DWORD [ebp+8], 0
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jns L9
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sub esp, 12
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push 45
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call putc
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add esp, 16
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neg DWORD [ebp+8]
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L9:
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mov DWORD [ebp-4], 1
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mov BYTE [ebp-5], 0
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L10:
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mov eax, DWORD [ebp+8]
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cmp eax, DWORD [ebp-4]
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jae L12
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jmp L11
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L12:
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mov eax, DWORD [ebp-4]
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mov edx, eax
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sal edx, 2
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add edx, eax
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lea eax, [edx+edx]
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mov DWORD [ebp-4], eax
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jmp L10
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L11:
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mov edx, DWORD [ebp-4]
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mov eax, -858993459
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mul edx
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mov eax, edx
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shr eax, 3
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mov DWORD [ebp-4], eax
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L13:
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cmp DWORD [ebp-4], 1
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ja L15
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jmp L14
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L15:
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mov edx, DWORD [ebp+8]
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mov eax, edx
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mov edx, 0
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div DWORD [ebp-4]
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mov DWORD [ebp-12], eax
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mov al, BYTE [ebp-12]
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mov BYTE [ebp-5], al
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mov eax, 0
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mov al, BYTE [ebp-5]
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imul eax, DWORD [ebp-4]
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sub DWORD [ebp+8], eax
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mov edx, DWORD [ebp-4]
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mov eax, -858993459
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mul edx
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mov eax, edx
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shr eax, 3
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mov DWORD [ebp-4], eax
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lea eax, [ebp-5]
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add BYTE [eax], 48
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sub esp, 12
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mov eax, 0
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mov al, BYTE [ebp-5]
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push eax
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call putc
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add esp, 16
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jmp L13
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L14:
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sub esp, 12
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mov al, BYTE [ebp+8]
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add eax, 48
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and eax, 255
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push eax
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call putc
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add esp, 16
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leave
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ret
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+117
@@ -0,0 +1,117 @@
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;idt.inc
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;Author: Josh Holtrop
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||||
;Date: 10/30/03
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||||
;Modified: 03/02/04
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||||
|
||||
idtr:
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||||
dw 50*8-1 ;size of idt
|
||||
dd IDT_V ;address of idt
|
||||
|
||||
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||||
%macro isr_label 1
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||||
isr_%1:
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push eax
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||||
mov eax, %1
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jmp isr_main
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%endmacro
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isr_label 0
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||||
isr_label 1
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||||
isr_label 2
|
||||
isr_label 3
|
||||
isr_label 4
|
||||
isr_label 5
|
||||
isr_label 6
|
||||
isr_label 7
|
||||
isr_label 8
|
||||
isr_label 9
|
||||
isr_label 10
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||||
isr_label 11
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||||
isr_label 12
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||||
isr_label 13
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||||
isr_label 14
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||||
isr_label 15
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||||
isr_label 16
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isr_label 17
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||||
isr_label 18
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||||
isr_label 19
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||||
isr_label 20
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||||
isr_label 21
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||||
isr_label 22
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||||
isr_label 23
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||||
isr_label 24
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||||
isr_label 25
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||||
isr_label 26
|
||||
isr_label 27
|
||||
isr_label 28
|
||||
isr_label 29
|
||||
isr_label 30
|
||||
isr_label 31
|
||||
isr_label 32
|
||||
isr_label 33
|
||||
isr_label 34
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||||
isr_label 35
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||||
isr_label 36
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||||
isr_label 37
|
||||
isr_label 38
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||||
isr_label 39
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||||
isr_label 40
|
||||
isr_label 41
|
||||
isr_label 42
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||||
isr_label 43
|
||||
isr_label 44
|
||||
isr_label 45
|
||||
isr_label 46
|
||||
isr_label 47
|
||||
isr_label 48
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||||
isr_label 49
|
||||
|
||||
isr_main:
|
||||
cmp eax, 0x30
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||||
jz isr_syscall
|
||||
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||||
pusha
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||||
push ds
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||||
push es
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||||
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||||
push eax
|
||||
|
||||
call isr
|
||||
|
||||
add esp, 4
|
||||
|
||||
pop es
|
||||
pop ds
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||||
popa
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||||
pop eax
|
||||
|
||||
iret
|
||||
|
||||
|
||||
isr_syscall:
|
||||
pop eax ;syscall function number
|
||||
pusha
|
||||
push ds
|
||||
push es
|
||||
|
||||
sc1:
|
||||
cmp eax, 1 ;syscall 1 - putc
|
||||
jnz sc2
|
||||
push ebx
|
||||
call putc
|
||||
add esp, 4
|
||||
jmp scdone
|
||||
sc2:
|
||||
|
||||
scdone:
|
||||
pop es
|
||||
pop ds
|
||||
popa
|
||||
iret
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
+102
@@ -0,0 +1,102 @@
|
||||
;kernel.asm
|
||||
;Author: Josh Holtrop
|
||||
;Date: 10/30/03
|
||||
;Modified: 10/30/03
|
||||
|
||||
%define GDT_P 0x100000; ;1mb physical - Global Descriptor Table space
|
||||
%define GDT_V GDT_P+0xC0000000
|
||||
%define IDT_P 0x102000 ;1mb+8kb - Interrupt Descriptor Table space
|
||||
%define IDT_V IDT_P+0xC0000000
|
||||
%define PDBR_P 0x104000 ;1mb+16kb - Page Directory Base Register (first PD)
|
||||
%define PDBR_V PDBR_P+0xC0000000
|
||||
%define LOPT_P 0x105000 ;1mb+20kb - LOw Page Table for mapping first 4mb
|
||||
%define LOPT_V LOPT_P+0xC0000000
|
||||
%define KERNEL_P 0x106000 ;1mb+24kb - the kernel's physical address
|
||||
%define KERNEL_V KERNEL_P+0xC0000000 ;3gb+1mb+24kb, the virtual address of the kernel
|
||||
|
||||
[global start]
|
||||
[extern isr]
|
||||
[extern k_init]
|
||||
[extern putc]
|
||||
|
||||
bits 32
|
||||
|
||||
;This is where the kernel begins execution
|
||||
;At this point, the temporary gdt is set up to "map" 0xC000_0000 to 0x0.
|
||||
;We must enable paging with the first 4mb mapped 1:1 virtual:physical
|
||||
; and with the 4mb starting at 0xC000_0000 mapped to the first 4mb physical.
|
||||
;Then we can start using our "real" gdt, then unmap the lower 4mb.
|
||||
start:
|
||||
cli ;if they weren't already off
|
||||
|
||||
xor eax, eax
|
||||
mov edi, PDBR_V
|
||||
mov ecx, 1024 ;clear the PDBR
|
||||
rep stosd
|
||||
mov [PDBR_V], dword LOPT_P|0x03 ;store the physical address of the LOw Page Table (read/write, present)
|
||||
mov [PDBR_V+0xC00], dword LOPT_P|0x03 ;store the physical address of the LOw Page Table (read/write, present)
|
||||
|
||||
mov edi, LOPT_V
|
||||
mov ecx, 1024
|
||||
mov eax, 0x03 ;starting physical address = 0x0 (read/write, present flags)
|
||||
fill_lopt_loop: ;fill the page table
|
||||
stosd
|
||||
add eax, 4096 ;increment next phsyical address by 4kb
|
||||
loop fill_lopt_loop
|
||||
|
||||
mov eax, PDBR_P
|
||||
mov cr3, eax ;store the Page Directory Base Address
|
||||
mov eax, cr0
|
||||
or eax, 0x80000000 ;set page enable bit
|
||||
mov cr0, eax ;now paging is active!
|
||||
|
||||
|
||||
mov edi, GDT_V
|
||||
mov esi, gdt
|
||||
mov ecx, gdt_end-gdt
|
||||
copy_gdt:
|
||||
lodsb
|
||||
stosb
|
||||
loop copy_gdt
|
||||
|
||||
mov edi, IDT_V ;destination
|
||||
mov esi, isr_0 ;address of isr0
|
||||
mov edx, isr_1-isr_0 ;distance between isr labels
|
||||
mov ecx, 50 ;number of isrlabels
|
||||
fill_idt:
|
||||
mov ebx, esi
|
||||
mov ax, si
|
||||
stosw ;0 offset 15:0
|
||||
mov ax, KERNEL_CODE
|
||||
stosw ;2 selector 15:0
|
||||
mov ax, 0x8E00
|
||||
stosw ;4 [P][DPL][0][TYPE][0][0][0][0][0][0][0][0]
|
||||
shr esi, 16
|
||||
mov ax, si
|
||||
stosw ;6 offset 31:16
|
||||
mov esi, ebx
|
||||
add esi, edx
|
||||
loop fill_idt
|
||||
mov word [IDT_V+0x30*8+4], 0xEE00 ;interrupt 0x30 has user priviledges
|
||||
|
||||
lgdt [gdtr] ;load gdt
|
||||
jmp KERNEL_CODE:newgdtcontinue
|
||||
newgdtcontinue:
|
||||
mov ax, KERNEL_DATA
|
||||
mov es, ax
|
||||
mov ds, ax
|
||||
mov gs, ax
|
||||
mov fs, ax
|
||||
mov ss, ax
|
||||
mov esp, 0xc0200000 ;stack just under 3gb+2mb, moves downward
|
||||
lidt [idtr] ;load idt
|
||||
|
||||
call k_init
|
||||
haltit:
|
||||
hlt ;halt processor when k_init is done
|
||||
jmp haltit ;shouldn't get here...
|
||||
|
||||
%include "gdt.inc"
|
||||
%include "idt.inc"
|
||||
|
||||
|
||||
Reference in new issue
Block a user