Initial import

1 files changed, 89 insertions, 0 deletions

diff --git a/arch/x86/include/asm/lguest.h b/arch/x86/include/asm/lguest.h
new file mode 100644
index 000000000..3bbc07a57
--- /dev/null
+++ b/arch/x86/include/asm/lguest.h
@@ -0,0 +1,89 @@
+#ifndef _ASM_X86_LGUEST_H
+#define _ASM_X86_LGUEST_H
+
+#define GDT_ENTRY_LGUEST_CS	10
+#define GDT_ENTRY_LGUEST_DS	11
+#define LGUEST_CS		(GDT_ENTRY_LGUEST_CS * 8)
+#define LGUEST_DS		(GDT_ENTRY_LGUEST_DS * 8)
+
+#ifndef __ASSEMBLY__
+#include <asm/desc.h>
+
+#define GUEST_PL 1
+
+/* Page for Switcher text itself, then two pages per cpu */
+#define TOTAL_SWITCHER_PAGES (1 + 2 * nr_cpu_ids)
+
+/* Where we map the Switcher, in both Host and Guest. */
+extern unsigned long switcher_addr;
+
+/* Found in switcher.S */
+extern unsigned long default_idt_entries[];
+
+/* Declarations for definitions in arch/x86/lguest/head_32.S */
+extern char lguest_noirq_iret[];
+extern const char lgstart_cli[], lgend_cli[];
+extern const char lgstart_pushf[], lgend_pushf[];
+
+extern void lguest_iret(void);
+extern void lguest_init(void);
+
+struct lguest_regs {
+	/* Manually saved part. */
+	unsigned long eax, ebx, ecx, edx;
+	unsigned long esi, edi, ebp;
+	unsigned long gs;
+	unsigned long fs, ds, es;
+	unsigned long trapnum, errcode;
+	/* Trap pushed part */
+	unsigned long eip;
+	unsigned long cs;
+	unsigned long eflags;
+	unsigned long esp;
+	unsigned long ss;
+};
+
+/* This is a guest-specific page (mapped ro) into the guest. */
+struct lguest_ro_state {
+	/* Host information we need to restore when we switch back. */
+	u32 host_cr3;
+	struct desc_ptr host_idt_desc;
+	struct desc_ptr host_gdt_desc;
+	u32 host_sp;
+
+	/* Fields which are used when guest is running. */
+	struct desc_ptr guest_idt_desc;
+	struct desc_ptr guest_gdt_desc;
+	struct x86_hw_tss guest_tss;
+	struct desc_struct guest_idt[IDT_ENTRIES];
+	struct desc_struct guest_gdt[GDT_ENTRIES];
+};
+
+struct lg_cpu_arch {
+	/* The GDT entries copied into lguest_ro_state when running. */
+	struct desc_struct gdt[GDT_ENTRIES];
+
+	/* The IDT entries: some copied into lguest_ro_state when running. */
+	struct desc_struct idt[IDT_ENTRIES];
+
+	/* The address of the last guest-visible pagefault (ie. cr2). */
+	unsigned long last_pagefault;
+};
+
+static inline void lguest_set_ts(void)
+{
+	u32 cr0;
+
+	cr0 = read_cr0();
+	if (!(cr0 & 8))
+		write_cr0(cr0 | 8);
+}
+
+/* Full 4G segment descriptors, suitable for CS and DS. */
+#define FULL_EXEC_SEGMENT \
+	((struct desc_struct)GDT_ENTRY_INIT(0xc09b, 0, 0xfffff))
+#define FULL_SEGMENT ((struct desc_struct)GDT_ENTRY_INIT(0xc093, 0, 0xfffff))
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_X86_LGUEST_H */