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https://github.com/justinian/jsix.git
synced 2025-12-10 08:24:32 -08:00
3b560c063a
Return to having the bootloader re-map the kernel into the higher half before jumping into the kernel entrypoint, so we don't have to juggle pointers inside the kernel.
122 lines
1.5 KiB
ArmAsm
122 lines
1.5 KiB
ArmAsm
extern g_idtr
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extern g_gdtr
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global idt_write
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idt_write:
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lidt [rel g_idtr]
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ret
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global idt_load
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idt_load:
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sidt [rel g_idtr]
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ret
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global gdt_write
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gdt_write:
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lgdt [rel g_gdtr]
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ret
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global gdt_load
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gdt_load:
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sgdt [rel g_gdtr]
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ret
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%macro push_all_and_segments 0
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push rax
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push rcx
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push rdx
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push rbx
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push rsp
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push rbp
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push rsi
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push rdi
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mov ax, ds
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push rax
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%endmacro
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%macro pop_all_and_segments 0
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pop rax
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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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pop rdi
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pop rsi
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pop rbp
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pop rsp
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pop rbx
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pop rdx
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pop rcx
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pop rax
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%endmacro
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%macro load_kernel_segments 0
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mov ax, 0x10 ; load the kernel data segment
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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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%endmacro
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extern isr_handler
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global isr_handler_prelude
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isr_handler_prelude:
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push_all_and_segments
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load_kernel_segments
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call isr_handler
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pop_all_and_segments
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add rsp, 16 ; because the ISRs added err/num
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sti
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iretq
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extern irq_handler
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global irq_handler_prelude
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irq_handler_prelude:
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push_all_and_segments
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load_kernel_segments
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call irq_handler
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pop_all_and_segments
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add rsp, 16 ; because the ISRs added err/num
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sti
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iretq
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%macro EMIT_ISR 2
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global %1
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%1:
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cli
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push byte 0
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push byte %2
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jmp isr_handler_prelude
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%endmacro
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%macro EMIT_EISR 2
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global %1
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%1:
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cli
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push byte %2
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jmp isr_handler_prelude
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%endmacro
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%macro EMIT_IRQ 2
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global %1
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%1:
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cli
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push byte 0
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push byte %2
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jmp irq_handler_prelude
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%endmacro
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%define EISR(i, name) EMIT_EISR name, i
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%define ISR(i, name) EMIT_ISR name, i
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%define IRQ(i, q, name) EMIT_IRQ name, i
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%include "interrupt_isrs.inc"
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