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authorRusty Russell <rusty@rustcorp.com.au>2007-10-22 11:03:36 +1000
committerRusty Russell <rusty@rustcorp.com.au>2007-10-23 15:49:54 +1000
commit47436aa4ad054c1c7c8231618e86ebd9305308dc (patch)
treea9ba6e0521f9116442144a86e781a3164ec86094 /include/linux/lguest.h
parentc18acd73ffc209def08003a1927473096f66c5ad (diff)
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Boot with virtual == physical to get closer to native Linux.
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>
Diffstat (limited to 'include/linux/lguest.h')
-rw-r--r--include/linux/lguest.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/lguest.h b/include/linux/lguest.h
index 083052236db9..8beb29134626 100644
--- a/include/linux/lguest.h
+++ b/include/linux/lguest.h
@@ -44,11 +44,14 @@ struct lguest_data
unsigned long reserve_mem;
/* KHz for the TSC clock. */
u32 tsc_khz;
+ /* Page where the top-level pagetable is */
+ unsigned long pgdir;
/* Fields initialized by the Guest at boot: */
/* Instruction range to suppress interrupts even if enabled */
unsigned long noirq_start, noirq_end;
-
+ /* Address above which page tables are all identical. */
+ unsigned long kernel_address;
/* The vector to try to use for system calls (0x40 or 0x80). */
unsigned int syscall_vec;
};