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>
diff --git a/include/asm-x86/lguest_hcall.h b/include/asm-x86/lguest_hcall.h
index 8f2a1ed..0c553ef 100644
--- a/include/asm-x86/lguest_hcall.h
+++ b/include/asm-x86/lguest_hcall.h
@@ -2,8 +2,6 @@
#ifndef _X86_LGUEST_HCALL_H
#define _X86_LGUEST_HCALL_H
-#include <asm/hw_irq.h>
-
#define LHCALL_FLUSH_ASYNC 0
#define LHCALL_LGUEST_INIT 1
#define LHCALL_CRASH 2
@@ -36,6 +34,9 @@
* definition of a gentleman: "someone who is only rude intentionally". */
#define LGUEST_TRAP_ENTRY 0x1F
+#ifndef __ASSEMBLY__
+#include <asm/hw_irq.h>
+
static inline unsigned long
hcall(unsigned long call,
unsigned long arg1, unsigned long arg2, unsigned long arg3)
@@ -66,4 +67,6 @@
/* These map directly onto eax, ebx, ecx, edx in struct lguest_regs */
unsigned long arg0, arg2, arg3, arg1;
};
+
+#endif /* !__ASSEMBLY__ */
#endif /* _I386_LGUEST_HCALL_H */
diff --git a/include/linux/lguest.h b/include/linux/lguest.h
index 0830522..8beb291 100644
--- a/include/linux/lguest.h
+++ b/include/linux/lguest.h
@@ -44,11 +44,14 @@
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;
};
