76 lines
1.4 KiB
HolyC
76 lines
1.4 KiB
HolyC
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/*TempleOS runs exclusively in ring 0.
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Ring 0 is part of the $LK,"Charter",A="FI:::/Doc/Charter.DD"$.
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This demo is for you to play around
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with ring 3. TempleOS is for
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recreational programming, after all.
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This redirects the general protection
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fault, switches to ring 3, and generates
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a fault to switch back.
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*/
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U8 *old_stk,*new_rip;
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asm {
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INT_TO_RING0:: //Set to handle general protection 0xD fault temporarily.
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INC U64 [SYS_PROGRESS1]
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PUSH U32 CGDT.ds //STKSEG
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MOV RAX,U64 [&old_stk]
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PUSH RAX
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PUSH U32 0 //FLAGS--interrupts off
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PUSH U32 CGDT.cs64
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MOV RAX,U64 [&new_rip]
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PUSH RAX
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IRET
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}
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U0 Ring3Demo()
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{
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U8 *old_vect;
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"Progress1 Before:%X\n",progress1;
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CLI
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old_vect=IntEntrySet(0x0D,INT_TO_RING0,IDTET_TRAP,0);
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TSSBusy(Gs->tss->tr_ring3,OFF);
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SetRAX(Gs->tss->tr_ring3+3);
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LTR AX
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asm {
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MOV U64 [&old_stk],RSP
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LEA RAX,[R3_CALLBACK]
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MOV U64 [&new_rip],RAX
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MOV AX,CGDT.ds_ring3+3
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MOV DS,AX
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MOV ES,AX
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PUSH U32 CGDT.ds_ring3+3 //STKSEG
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PUSH U64 [&old_stk]
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PUSH U32 0 //FLAGS--interrupts off
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PUSH U32 CGDT.cs64_ring3+3
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LEA RAX,[R3_START]
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PUSH RAX
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IRET
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R3_START:
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INC U64 [SYS_PROGRESS1]
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CLI //This causes general protection fault #13
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R3_CALLBACK:
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MOV AX,CGDT.ds
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MOV DS,AX
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MOV ES,AX
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}
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TSSBusy(Gs->tss->tr,OFF);
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SetRAX(Gs->tss->tr);
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LTR AX
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IntEntrySet(0x0D,old_vect,IDTET_IRQ,0);
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STI
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"Progress1 After :%X\n",progress1;
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}
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Ring3Demo;
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