X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=Kernel%2Farch%2Fx86%2Fdesctab.asm;h=f6cc14e1b7e3bfcf26f9a9ff5e7b068e116b0139;hb=18b264927674c480481466c40368554fb72f560f;hp=1513984ae23e526479dec84d935ffadf7e278b1b;hpb=43be77083eba1fc5b11b46deddcf499bac054d6e;p=tpg%2Facess2.git

diff --git a/Kernel/arch/x86/desctab.asm b/Kernel/arch/x86/desctab.asm
index 1513984a..f6cc14e1 100644
--- a/Kernel/arch/x86/desctab.asm
+++ b/Kernel/arch/x86/desctab.asm
@@ -31,7 +31,8 @@ gGDTPtr:
 ALIGN 8
 [global gIDT]
 gIDT:
-	times	256	dd	0x00080000,0x00000F00
+	; CS = 0x08, Type = 32-bit Interrupt (0xE = 1 110)
+	times	256	dd	0x00080000,0x00000E00
 [global gIDTPtr]
 gIDTPtr:
 	dw	256 * 16 - 1	; Limit
@@ -52,34 +53,47 @@ Desctab_Install:
 	jmp 0x08:.pl0code
 .pl0code:
 
-	; Set IDT
+	; Set up IDT
+	; Helper Macros
+	; - Set an IDT entry to an ISR
 %macro SETISR	1
 	mov eax, Isr%1
 	mov	WORD [gIDT + %1*8], ax
 	shr eax, 16
 	mov	WORD [gIDT + %1*8+6], ax
+	; Enable
 	mov	ax, WORD [gIDT + %1*8 + 4]
 	or ax, 0x8000
 	mov	WORD [gIDT + %1*8 + 4], ax
 %endmacro
-%macro SETUSER	1
-	mov	ax, WORD [gIDT + %1*8 + 4]
-	or ax, 0x6000
-	mov	WORD [gIDT + %1*8 + 4], ax
+	; Enable user calling of an ISR
+%macro SET_USER	1
+	or WORD [gIDT + %1*8 + 4], 0x6000
+%endmacro
+	; Set an ISR as a trap (leaves interrupts enabled when invoked)
+%macro SET_TRAP	1
+	or WORD [gIDT + %1*8 + 4], 0x0100
 %endmacro
+
+	; Error handlers
 	%assign	i	0
 	%rep 32
 	SETISR	i
 	%assign i i+1
 	%endrep
 	
+	; User Syscall
 	SETISR	0xAC
-	SETUSER	0xAC
+	SET_USER	0xAC
+	SET_TRAP	0xAC	; Interruptable
 	
+	; MP ISRs
 	%if USE_MP
-	SETISR	239
+	SETISR	0xEE	; 0xEE Timer
+	SETISR	0xEF	; 0xEF Spurious Interrupt
 	%endif
-	
+
+	; IRQs
 	%assign	i	0xF0
 	%rep 16
 	SETISR	i
@@ -134,7 +148,7 @@ Isr%1:
 %macro	ISR_NOERR	1
 [global Isr%1]
 Isr%1:
-	xchg bx, bx
+	;xchg bx, bx
 	push	0
 	push	%1
 	jmp	ErrorCommon
@@ -191,24 +205,33 @@ ISR_NOERR	31; 31: Reserved
 
 DEF_SYSCALL	0xAC	; Acess System Call
 
-; AP's Timer Interrupt
 %if USE_MP
-[global Isr239]
+[global Isr0xEE]
 [extern SchedulerBase]
-Isr239:
+; AP's Timer Interrupt
+Isr0xEE:
 	push 0
+	xchg bx, bx	; MAGIC BREAK
 	jmp SchedulerBase
+; Spurious Interrupt
+[global Isr0xEF]
+Isr0xEF:
+	xchg bx, bx	; MAGIC BREAK
+	iret
 %endif
 
 ; IRQs
 ; - Timer
 [global Isr240]
+[global Isr240.jmp]
 [extern SchedulerBase]
 [extern SetAPICTimerCount]
 Isr240:
 	push 0
+	;xchg bx, bx	; MAGIC BREAK
+Isr240.jmp:
 	%if USE_MP
-	jmp SetAPICTimerCount
+	jmp SetAPICTimerCount	; This is reset once the bus speed has been calculated
 	%else
 	jmp SchedulerBase
 	%endif
@@ -224,7 +247,7 @@ Isr240:
 ; ---------------------
 [extern ErrorHandler]
 ErrorCommon:
-	;xchg bx, bx
+	;xchg bx, bx	; MAGIC BREAK
 	pusha
 	push ds
 	push es