1 files changed, 86 insertions, 0 deletions

diff --git a/include/asm-x86/lguest.h b/include/asm-x86/lguest.h
new file mode 100644
index 000000000000..ccd338460811
--- /dev/null
+++ b/include/asm-x86/lguest.h
@@ -0,0 +1,86 @@
+#ifndef _X86_LGUEST_H
+#define _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
+
+/* Every guest maps the core switcher code. */
+#define SHARED_SWITCHER_PAGES \
+        DIV_ROUND_UP(end_switcher_text - start_switcher_text, PAGE_SIZE)
+/* Pages for switcher itself, then two pages per cpu */
+#define TOTAL_SWITCHER_PAGES (SHARED_SWITCHER_PAGES + 2 * NR_CPUS)
+
+/* We map at -4M for ease of mapping into the guest (one PTE page). */
+#define SWITCHER_ADDR 0xFFC00000
+
+/* Found in switcher.S */
+extern unsigned long default_idt_entries[];
+
+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 Xgt_desc_struct host_idt_desc;
+        struct Xgt_desc_struct host_gdt_desc;
+        u32 host_sp;
+
+        /* Fields which are used when guest is running. */
+        struct Xgt_desc_struct guest_idt_desc;
+        struct Xgt_desc_struct guest_gdt_desc;
+        struct i386_hw_tss guest_tss;
+        struct desc_struct guest_idt[IDT_ENTRIES];
+        struct desc_struct guest_gdt[GDT_ENTRIES];
+};
+
+struct lguest_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){0x0000ffff, 0x00cf9b00})
+#define FULL_SEGMENT ((struct desc_struct){0x0000ffff, 0x00cf9300})
+
+#endif /* __ASSEMBLY__ */
+
+#endif