88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
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#ifndef _X86_LGUEST_H
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#define _X86_LGUEST_H
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#define GDT_ENTRY_LGUEST_CS 10
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#define GDT_ENTRY_LGUEST_DS 11
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#define LGUEST_CS (GDT_ENTRY_LGUEST_CS * 8)
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#define LGUEST_DS (GDT_ENTRY_LGUEST_DS * 8)
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#ifndef __ASSEMBLY__
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#include <asm/desc.h>
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#define GUEST_PL 1
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/* Every guest maps the core switcher code. */
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#define SHARED_SWITCHER_PAGES \
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DIV_ROUND_UP(end_switcher_text - start_switcher_text, PAGE_SIZE)
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/* Pages for switcher itself, then two pages per cpu */
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#define TOTAL_SWITCHER_PAGES (SHARED_SWITCHER_PAGES + 2 * NR_CPUS)
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/* We map at -4M for ease of mapping into the guest (one PTE page). */
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#define SWITCHER_ADDR 0xFFC00000
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/* Found in switcher.S */
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extern unsigned long default_idt_entries[];
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struct lguest_regs
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{
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/* Manually saved part. */
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unsigned long ebx, ecx, edx;
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unsigned long esi, edi, ebp;
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unsigned long gs;
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unsigned long eax;
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unsigned long fs, ds, es;
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unsigned long trapnum, errcode;
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/* Trap pushed part */
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unsigned long eip;
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unsigned long cs;
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unsigned long eflags;
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unsigned long esp;
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unsigned long ss;
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};
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/* This is a guest-specific page (mapped ro) into the guest. */
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struct lguest_ro_state
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{
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/* Host information we need to restore when we switch back. */
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u32 host_cr3;
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struct Xgt_desc_struct host_idt_desc;
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struct Xgt_desc_struct host_gdt_desc;
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u32 host_sp;
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/* Fields which are used when guest is running. */
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struct Xgt_desc_struct guest_idt_desc;
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struct Xgt_desc_struct guest_gdt_desc;
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struct i386_hw_tss guest_tss;
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struct desc_struct guest_idt[IDT_ENTRIES];
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struct desc_struct guest_gdt[GDT_ENTRIES];
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};
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struct lguest_arch
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{
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/* The GDT entries copied into lguest_ro_state when running. */
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struct desc_struct gdt[GDT_ENTRIES];
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/* The IDT entries: some copied into lguest_ro_state when running. */
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struct desc_struct idt[IDT_ENTRIES];
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/* The address of the last guest-visible pagefault (ie. cr2). */
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unsigned long last_pagefault;
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};
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static inline void lguest_set_ts(void)
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{
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u32 cr0;
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cr0 = read_cr0();
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if (!(cr0 & 8))
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write_cr0(cr0|8);
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}
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/* Full 4G segment descriptors, suitable for CS and DS. */
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#define FULL_EXEC_SEGMENT ((struct desc_struct){0x0000ffff, 0x00cf9b00})
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#define FULL_SEGMENT ((struct desc_struct){0x0000ffff, 0x00cf9300})
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#endif /* __ASSEMBLY__ */
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#endif
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