Add build system scaffolding and libc headers

1 files changed, 131 insertions, 0 deletions

diff --git a/include/arch/x86_64/asm/vm86.h b/include/arch/x86_64/asm/vm86.h
new file mode 100644
index 00000000..3d73980b
--- /dev/null
+++ b/include/arch/x86_64/asm/vm86.h
@@ -0,0 +1,131 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _ASM_X86_VM86_H
+#define _ASM_X86_VM86_H
+
+/*
+ * I'm guessing at the VIF/VIP flag usage, but hope that this is how
+ * the Pentium uses them. Linux will return from vm86 mode when both
+ * VIF and VIP is set.
+ *
+ * On a Pentium, we could probably optimize the virtual flags directly
+ * in the eflags register instead of doing it "by hand" in vflags...
+ *
+ * Linus
+ */
+
+#include <asm/processor-flags.h>
+
+#define BIOSSEG 0x0f000
+
+#define CPU_086 0
+#define CPU_186 1
+#define CPU_286 2
+#define CPU_386 3
+#define CPU_486 4
+#define CPU_586 5
+
+/*
+ * Return values for the 'vm86()' system call
+ */
+#define VM86_TYPE(retval) ((retval) & 0xff)
+#define VM86_ARG(retval)  ((retval) >> 8)
+
+#define VM86_SIGNAL 0 /* return due to signal */
+#define VM86_UNKNOWN                      \
+	1	    /* unhandled GP fault \
+		       - IO-instruction or similar */
+#define VM86_INTx 2 /* int3/int x instruction (ARG = x) */
+#define VM86_STI                               \
+	3 /* sti/popf/iret instruction enabled \
+	     virtual interrupts */
+
+/*
+ * Additional return values when invoking new vm86()
+ */
+#define VM86_PICRETURN 4 /* return due to pending PIC request */
+#define VM86_TRAP      6 /* return due to DOS-debugger request */
+
+/*
+ * function codes when invoking new vm86()
+ */
+#define VM86_PLUS_INSTALL_CHECK 0
+#define VM86_ENTER		1
+#define VM86_ENTER_NO_BYPASS	2
+#define VM86_REQUEST_IRQ	3
+#define VM86_FREE_IRQ		4
+#define VM86_GET_IRQ_BITS	5
+#define VM86_GET_AND_RESET_IRQ	6
+
+/*
+ * This is the stack-layout seen by the user space program when we have
+ * done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout
+ * is 'kernel_vm86_regs' (see below).
+ */
+
+struct vm86_regs {
+	/*
+	 * normal regs, with special meaning for the segment descriptors..
+	 */
+	long ebx;
+	long ecx;
+	long edx;
+	long esi;
+	long edi;
+	long ebp;
+	long eax;
+	long __null_ds;
+	long __null_es;
+	long __null_fs;
+	long __null_gs;
+	long orig_eax;
+	long eip;
+	unsigned short cs, __csh;
+	long eflags;
+	long esp;
+	unsigned short ss, __ssh;
+	/*
+	 * these are specific to v86 mode:
+	 */
+	unsigned short es, __esh;
+	unsigned short ds, __dsh;
+	unsigned short fs, __fsh;
+	unsigned short gs, __gsh;
+};
+
+struct revectored_struct {
+	unsigned long __map[8]; /* 256 bits */
+};
+
+struct vm86_struct {
+	struct vm86_regs regs;
+	unsigned long flags;
+	unsigned long screen_bitmap; /* unused, preserved by vm86() */
+	unsigned long cpu_type;
+	struct revectored_struct int_revectored;
+	struct revectored_struct int21_revectored;
+};
+
+/*
+ * flags masks
+ */
+#define VM86_SCREEN_BITMAP 0x0001 /* no longer supported */
+
+struct vm86plus_info_struct {
+	unsigned long force_return_for_pic : 1;
+	unsigned long vm86dbg_active : 1;   /* for debugger */
+	unsigned long vm86dbg_TFpendig : 1; /* for debugger */
+	unsigned long unused : 28;
+	unsigned long is_vm86pus : 1;	    /* for vm86 internal use */
+	unsigned char vm86dbg_intxxtab[32]; /* for debugger */
+};
+struct vm86plus_struct {
+	struct vm86_regs regs;
+	unsigned long flags;
+	unsigned long screen_bitmap;
+	unsigned long cpu_type;
+	struct revectored_struct int_revectored;
+	struct revectored_struct int21_revectored;
+	struct vm86plus_info_struct vm86plus;
+};
+
+#endif /* _ASM_X86_VM86_H */