120 lines
2.4 KiB
C
120 lines
2.4 KiB
C
#ifndef _KERNEL_PLATFORM_X86_X86_64_TASKING_TRAPFRAME_H
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#define _KERNEL_PLATFORM_X86_X86_64_TASKING_TRAPFRAME_H
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#include <libkern/c_attrs.h>
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#include <libkern/types.h>
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#include <platform/x86/gdt.h>
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#include <platform/x86/tasking/tss.h>
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struct PACKED trapframe {
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// all registers
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uint64_t r15;
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uint64_t r14;
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uint64_t r13;
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uint64_t r12;
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uint64_t r11;
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uint64_t r10;
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uint64_t r9;
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uint64_t r8;
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uint64_t rbp;
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uint64_t rdi;
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uint64_t rsi;
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uint64_t rdx;
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uint64_t rcx;
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uint64_t rbx;
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uint64_t rax;
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// rest of trap frame
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uint64_t gs;
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uint64_t fs;
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uint64_t int_no;
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// below here defined by x86 hardware
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uint64_t err;
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uint64_t rip;
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uint64_t cs;
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// below here only when crossing rings, such as from user to kernel
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uint64_t rflags;
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uint64_t rsp;
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uint64_t ss;
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};
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typedef struct trapframe trapframe_t;
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static inline uintptr_t get_stack_pointer(trapframe_t* tf)
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{
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return tf->rsp;
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}
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static inline void set_stack_pointer(trapframe_t* tf, uintptr_t sp)
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{
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tf->rsp = sp;
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}
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static inline uintptr_t get_frame_pointer(trapframe_t* tf)
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{
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return tf->rbp;
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}
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static inline void set_frame_pointer(trapframe_t* tf, uintptr_t bp)
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{
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tf->rbp = bp;
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}
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static inline uintptr_t get_instruction_pointer(trapframe_t* tf)
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{
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return tf->rip;
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}
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static inline void set_instruction_pointer(trapframe_t* tf, uintptr_t ip)
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{
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tf->rip = ip;
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}
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static inline uintptr_t get_syscall_result(trapframe_t* tf)
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{
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return tf->rax;
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}
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static inline void set_syscall_result(trapframe_t* tf, uintptr_t val)
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{
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tf->rax = val;
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}
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/**
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* STACK FUNCTIONS
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*/
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static inline void tf_push_to_stack(trapframe_t* tf, uintptr_t val)
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{
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tf->rsp -= sizeof(uintptr_t);
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*((uintptr_t*)tf->rsp) = val;
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}
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static inline uintptr_t tf_pop_to_stack(trapframe_t* tf)
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{
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uintptr_t val = *((uintptr_t*)tf->rsp);
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tf->rsp += sizeof(uintptr_t);
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return val;
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}
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static inline void tf_move_stack_pointer(trapframe_t* tf, int32_t val)
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{
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tf->rsp += val;
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}
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static inline void tf_setup_as_user_thread(trapframe_t* tf)
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{
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tf->cs = (GDT_SEG_UCODE << 3) | DPL_USER;
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tf->ss = (GDT_SEG_UDATA << 3) | DPL_USER;
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tf->rflags = FL_IF;
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}
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static inline void tf_setup_as_kernel_thread(trapframe_t* tf)
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{
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tf->cs = (GDT_SEG_KCODE << 3);
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tf->ss = (GDT_SEG_KDATA << 3);
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tf->rflags = FL_IF;
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}
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#endif // _KERNEL_PLATFORM_X86_X86_64_TASKING_TRAPFRAME_H
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