2022-11-16 16:37:18 +00:00
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section .text
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2022-11-15 18:10:32 +00:00
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global enable_sse
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enable_sse:
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mov rax, cr0
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and ax, 0xFFFB ;clear coprocessor emulation CR0.EM
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or ax, 0x2 ;set coprocessor monitoring CR0.MP
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mov cr0, rax
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mov rax, cr4
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or ax, 3 << 9 ;set CR4.OSFXSR and CR4.OSXMMEXCPT at the same time
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mov cr4, rax
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ret
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global enable_write_protect
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enable_write_protect:
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mov rax, cr0
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or eax, 0x80000 ;set write-protect CR0.WP
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mov cr0, rax
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2022-11-15 19:41:59 +00:00
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ret
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global enable_nx
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enable_nx:
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mov rcx, 0xC0000080 ; IA32_EFER
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rdmsr
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or eax, 1 << 11 ; no-execute enable (NXE)
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wrmsr
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ret
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global load_gdt
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load_gdt:
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cli
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lgdt [rdi]
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mov ax, 0x10
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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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push 0x08
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lea rax, [rel .reload_CS]
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push rax
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retfq
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.reload_CS:
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ret
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global load_tr
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load_tr:
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mov rax, rdi
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ltr ax
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2022-11-16 16:37:18 +00:00
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ret
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%macro ISR 1
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global _isr%1
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_isr%1:
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push byte 0
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push byte %1
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jmp _asm_interrupt_entry
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%endmacro
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%macro ISR_ERROR 1
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global _isr%1
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_isr%1:
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push byte %1
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jmp _asm_interrupt_entry
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%endmacro
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%macro IRQ 2
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global _isr%1
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_isr%1:
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push byte %2
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push byte %1
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jmp _asm_interrupt_entry
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%endmacro
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extern arch_interrupt_entry
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2022-11-18 19:51:25 +00:00
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extern arch_double_fault
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extern arch_machine_check
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2022-11-16 16:37:18 +00:00
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_asm_interrupt_entry:
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push rax
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push rbx
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push rcx
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push rdx
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push rsi
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push rdi
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push rbp
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push r8
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push r9
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push r10
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push r11
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push r12
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push r13
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push r14
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push r15
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cld
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mov rdi, rsp
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call arch_interrupt_entry
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pop r15
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pop r14
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pop r13
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pop r12
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pop r11
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pop r10
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pop r9
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pop r8
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pop rbp
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pop rdi
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pop rsi
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pop rdx
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pop rcx
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pop rbx
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pop rax
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add rsp, 16
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iretq
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2022-11-18 19:51:25 +00:00
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ISR 0 ; divide by zero (#DE)
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ISR 1 ; debug (#DB)
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ISR 2 ; non-maskable interrupt
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ISR 3 ; breakpoint (#BP)
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ISR 4 ; overflow (#OF)
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ISR 5 ; bound range exceeded (#BR)
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ISR 6 ; invalid opcode (#UD)
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ISR 7 ; device not available (#NM)
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global _isr8
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_isr8: ; double fault (#DF)
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jmp arch_double_fault
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ud2 ; we aren't even pushing a return address for arch_double_fault, this is truly UNREACHABLE
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; ISR 9 obsolete
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ISR_ERROR 10 ; invalid tss (#TS)
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ISR_ERROR 11 ; segment not present (#NP)
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ISR_ERROR 12 ; stack-segment fault (#SS)
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ISR_ERROR 13 ; general protection fault (#GP)
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ISR_ERROR 14 ; page fault (#PF)
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; ISR 15 reserved
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ISR 16 ; x87 floating-point exception (#MF)
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ISR_ERROR 17 ; alignment check (#AC)
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global _isr18
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_isr18: ; machine check (#MC)
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jmp arch_machine_check
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ud2 ; same as above
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ISR 19 ; SIMD floating-point exception (#XM)
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ISR 20 ; virtualization exception (#VE)
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ISR_ERROR 21 ; control-protection exception (#CP)
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; ISR 22-31 reserved
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