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
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 0xEE ; 0xEE Timer
+ SETISR 0xEF ; 0xEF Spurious Interrupt
+ %endif
+
+ ; IRQs
%assign i 0xF0
%rep 16
SETISR i
%macro ISR_NOERR 1
[global Isr%1]
Isr%1:
- xchg bx, bx
+ ;xchg bx, bx
push 0
push %1
jmp ErrorCommon
DEF_SYSCALL 0xAC ; Acess System Call
+%if USE_MP
+[global Isr0xEE]
+[extern SchedulerBase]
+; 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 ; This is reset once the bus speed has been calculated
+ %else
jmp SchedulerBase
+ %endif
; - Assignable
%assign i 0xF1
%rep 16
; ---------------------
[extern ErrorHandler]
ErrorCommon:
- ;xchg bx, bx
+ ;xchg bx, bx ; MAGIC BREAK
pusha
push ds
push es
; IRQ Handling
; ------------
[extern IRQ_Handler]
+[global IRQCommon]
IRQCommon:
pusha
push ds