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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/x86/include/asm/lguest.h
Initial import
Diffstat (limited to 'arch/x86/include/asm/lguest.h')
-rw-r--r--arch/x86/include/asm/lguest.h89
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 */