diff options
Diffstat (limited to 'kernel/arch/x86/include/asm/lguest.h')
| -rw-r--r-- | kernel/arch/x86/include/asm/lguest.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/kernel/arch/x86/include/asm/lguest.h b/kernel/arch/x86/include/asm/lguest.h new file mode 100644 index 000000000..3bbc07a57 --- /dev/null +++ b/kernel/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 */ |