Squash commits for public release

kernel/include/platform/x86/x86_64/tasking/trapframe.h

@@ -0,0 +1,120 @@
+#ifndef _KERNEL_PLATFORM_X86_X86_64_TASKING_TRAPFRAME_H
+#define _KERNEL_PLATFORM_X86_X86_64_TASKING_TRAPFRAME_H
+
+#include <libkern/c_attrs.h>
+#include <libkern/types.h>
+#include <platform/x86/gdt.h>
+#include <platform/x86/tasking/tss.h>
+
+struct PACKED trapframe {
+    // all registers
+    uint64_t r15;
+    uint64_t r14;
+    uint64_t r13;
+    uint64_t r12;
+    uint64_t r11;
+    uint64_t r10;
+    uint64_t r9;
+    uint64_t r8;
+    uint64_t rbp;
+    uint64_t rdi;
+    uint64_t rsi;
+    uint64_t rdx;
+    uint64_t rcx;
+    uint64_t rbx;
+    uint64_t rax;
+
+    // rest of trap frame
+    uint64_t gs;
+    uint64_t fs;
+    uint64_t int_no;
+
+    // below here defined by x86 hardware
+    uint64_t err;
+    uint64_t rip;
+    uint64_t cs;
+
+    // below here only when crossing rings, such as from user to kernel
+    uint64_t rflags;
+    uint64_t rsp;
+    uint64_t ss;
+};
+typedef struct trapframe trapframe_t;
+
+static inline uintptr_t get_stack_pointer(trapframe_t* tf)
+{
+    return tf->rsp;
+}
+
+static inline void set_stack_pointer(trapframe_t* tf, uintptr_t sp)
+{
+    tf->rsp = sp;
+}
+
+static inline uintptr_t get_frame_pointer(trapframe_t* tf)
+{
+    return tf->rbp;
+}
+
+static inline void set_frame_pointer(trapframe_t* tf, uintptr_t bp)
+{
+    tf->rbp = bp;
+}
+
+static inline uintptr_t get_instruction_pointer(trapframe_t* tf)
+{
+    return tf->rip;
+}
+
+static inline void set_instruction_pointer(trapframe_t* tf, uintptr_t ip)
+{
+    tf->rip = ip;
+}
+
+static inline uintptr_t get_syscall_result(trapframe_t* tf)
+{
+    return tf->rax;
+}
+
+static inline void set_syscall_result(trapframe_t* tf, uintptr_t val)
+{
+    tf->rax = val;
+}
+
+/**
+ * STACK FUNCTIONS
+ */
+
+static inline void tf_push_to_stack(trapframe_t* tf, uintptr_t val)
+{
+    tf->rsp -= sizeof(uintptr_t);
+    *((uintptr_t*)tf->rsp) = val;
+}
+
+static inline uintptr_t tf_pop_to_stack(trapframe_t* tf)
+{
+    uintptr_t val = *((uintptr_t*)tf->rsp);
+    tf->rsp += sizeof(uintptr_t);
+    return val;
+}
+
+static inline void tf_move_stack_pointer(trapframe_t* tf, int32_t val)
+{
+    tf->rsp += val;
+}
+
+static inline void tf_setup_as_user_thread(trapframe_t* tf)
+{
+    tf->cs = (GDT_SEG_UCODE << 3) | DPL_USER;
+    tf->ss = (GDT_SEG_UDATA << 3) | DPL_USER;
+    tf->rflags = FL_IF;
+}
+
+static inline void tf_setup_as_kernel_thread(trapframe_t* tf)
+{
+    tf->cs = (GDT_SEG_KCODE << 3);
+    tf->ss = (GDT_SEG_KDATA << 3);
+    tf->rflags = FL_IF;
+}
+
+#endif // _KERNEL_PLATFORM_X86_X86_64_TASKING_TRAPFRAME_H