47436aa4ad
1) This allows us to get alot closer to booting bzImages. 2) It means we don't have to know page_offset. 3) The Guest needs to modify the boot pagetables to create the PAGE_OFFSET mapping before jumping to C code. 4) guest_pa() walks the page tables rather than using page_offset. 5) We don't use page_offset to figure out whether to emulate: it was always kinda quesationable, and won't work for instructions done before remapping (bzImage unpacking in particular). 6) We still want the kernel address for tlb flushing: have the initial hypercall give us that, too. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
60 lines
2.1 KiB
C
60 lines
2.1 KiB
C
/* Things the lguest guest needs to know. Note: like all lguest interfaces,
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* this is subject to wild and random change between versions. */
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#ifndef _LINUX_LGUEST_H
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#define _LINUX_LGUEST_H
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#ifndef __ASSEMBLY__
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#include <linux/time.h>
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#include <asm/irq.h>
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#include <asm/lguest_hcall.h>
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#define LG_CLOCK_MIN_DELTA 100UL
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#define LG_CLOCK_MAX_DELTA ULONG_MAX
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/*G:032 The second method of communicating with the Host is to via "struct
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* lguest_data". The Guest's very first hypercall is to tell the Host where
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* this is, and then the Guest and Host both publish information in it. :*/
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struct lguest_data
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{
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/* 512 == enabled (same as eflags in normal hardware). The Guest
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* changes interrupts so often that a hypercall is too slow. */
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unsigned int irq_enabled;
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/* Fine-grained interrupt disabling by the Guest */
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DECLARE_BITMAP(blocked_interrupts, LGUEST_IRQS);
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/* The Host writes the virtual address of the last page fault here,
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* which saves the Guest a hypercall. CR2 is the native register where
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* this address would normally be found. */
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unsigned long cr2;
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/* Wallclock time set by the Host. */
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struct timespec time;
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/* Async hypercall ring. Instead of directly making hypercalls, we can
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* place them in here for processing the next time the Host wants.
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* This batching can be quite efficient. */
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/* 0xFF == done (set by Host), 0 == pending (set by Guest). */
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u8 hcall_status[LHCALL_RING_SIZE];
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/* The actual registers for the hypercalls. */
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struct hcall_args hcalls[LHCALL_RING_SIZE];
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/* Fields initialized by the Host at boot: */
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/* Memory not to try to access */
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unsigned long reserve_mem;
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/* KHz for the TSC clock. */
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u32 tsc_khz;
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/* Page where the top-level pagetable is */
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unsigned long pgdir;
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/* Fields initialized by the Guest at boot: */
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/* Instruction range to suppress interrupts even if enabled */
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unsigned long noirq_start, noirq_end;
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/* Address above which page tables are all identical. */
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unsigned long kernel_address;
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/* The vector to try to use for system calls (0x40 or 0x80). */
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unsigned int syscall_vec;
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};
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extern struct lguest_data lguest_data;
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#endif /* __ASSEMBLY__ */
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#endif /* _LINUX_LGUEST_H */
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