327 lines
4.5 KiB
ArmAsm
327 lines
4.5 KiB
ArmAsm
.global loadGDT
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//void _stdcall loadGDT(struct gdtp* ptr);
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loadGDT:
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mov 0x4(%esp), %eax // Load argument
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lgdt (%eax)
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//GDT is loaded now
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mov $0x10, %ax
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mov %ax, %ds
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mov %ax, %es
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mov %ax, %fs
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mov %ax, %gs
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mov %ax, %ss
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ljmp $0x8, $.1
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.1:
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ret
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.global loadIDT
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//void _stdcall loadIDT(struct idtp* ptr);
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loadIDT:
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mov 0x4(%esp), %eax
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lidt (%eax)
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ret
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//Handle interrupts
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.macro intr_stub nr
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.global intr_stub_\nr
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.align 16
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intr_stub_\nr:
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pushl $0
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pushl $\nr
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jmp intr_common_handler
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.endm
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.macro intr_stub_error_code nr
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.global intr_stub_\nr
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.align 16
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intr_stub_\nr:
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pushl $\nr
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jmp intr_common_handler
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.endm
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intr_stub 0
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intr_stub 1
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intr_stub 2
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intr_stub 3
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intr_stub 4
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intr_stub 5
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intr_stub 6
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intr_stub 7
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intr_stub_error_code 8
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intr_stub 9
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intr_stub_error_code 10
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intr_stub_error_code 11
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intr_stub_error_code 12
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intr_stub_error_code 13
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intr_stub_error_code 14
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intr_stub 15
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intr_stub 16
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intr_stub_error_code 17
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intr_stub 18
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intr_stub 255
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//This should cover everything.
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.extern handleINT
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intr_common_handler:
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push %ebp
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push %edi
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push %esi
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push %edx
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push %ecx
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push %ebx
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push %eax
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//Load kernel datasegs
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mov $0x10, %ax
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mov %ax, %ds
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mov %ax, %es
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push %esp
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call handleINT
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mov %eax, %esp
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//Load user datasegs
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mov $0x23, %ax
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mov %ax, %ds
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mov %ax, %es
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pop %eax
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pop %ebx
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pop %ecx
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pop %edx
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pop %esi
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pop %edi
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pop %ebp
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// Take error code and interrupt number from stack
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add $8, %esp
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// Exit interrupt
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iret
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