2021-10-10 14:39:17 +08:00
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format elf64
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public interrupt_ReloadSegments
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2021-10-14 15:51:50 +08:00
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public interrupt_LoadGDT
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public interrupt_LoadIDT
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2021-10-10 14:39:17 +08:00
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section '.text' executable
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; sysvx64call void interrupt_ReloadSegments()
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;
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; Clobbers: rax
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interrupt_ReloadSegments:
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2021-11-14 17:31:11 +08:00
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mov ax, 0x08 ; my data segment
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2021-10-10 14:39:17 +08:00
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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2021-11-14 17:31:11 +08:00
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;jmp 0x10:.flush
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2021-10-10 14:39:17 +08:00
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; as in https://forum.osdev.org/viewtopic.php?f=1&t=30739
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; farjump does not work in long mode, you need to do a far return:
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pop rax
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2021-11-14 17:31:11 +08:00
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push qword 0x10 ; my code segment
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2021-10-10 14:39:17 +08:00
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push rax
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retfq
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2021-10-14 15:51:50 +08:00
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; sysvx64call void interrupt_LoadGDT(uint16_t length_sub1, void* base_ptr)
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;
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; Input: (uint16_t di, void* rsi)
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; Clobbers: rax, flags
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interrupt_LoadGDT:
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mov rax, rsp ; save old RSP
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sub rsp, 10
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and rsp, 0xfffffffffffffffc ; align RSP to 4-byte
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mov [rsp], di
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mov [rsp+2], rsi
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lgdt [rsp]
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mov rsp, rax ; restore old RSP
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ret
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; sysvx64call void interrupt_LoadIDT(uint16_t length_sub1, void* base_ptr)
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;
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; Input: (uint16_t di, void* rsi)
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; Clobbers: rax, flags
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interrupt_LoadIDT:
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mov rax, rsp ; save old RSP
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sub rsp, 10
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and rsp, 0xfffffffffffffffc ; align RSP to 4-byte
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mov [rsp], di
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mov [rsp+2], rsi
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lidt [rsp]
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mov rsp, rax ; restore old RSP
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ret
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