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authorJes Sorensen <jes@sgi.com>2007-10-21 21:03:32 -0400
committerRusty Russell <rusty@rustcorp.com.au>2007-10-23 01:49:52 -0400
commitd612cde060a005c1effb13d0f665448a04ce5f67 (patch)
treee7d77ba966a7c1dad70433b23e6086a1b5e18159 /drivers/lguest/lguest_user.c
parent511801dc31c095b2bfe3bf5c6a370dbe9b042a70 (diff)
Move register setup into i386_core.c
Move setup_regs() to lguest_arch_setup_regs() in i386_core.c given that this is very architecture specific. Signed-off-by: Jes Sorensen <jes@sgi.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest/lguest_user.c')
-rw-r--r--drivers/lguest/lguest_user.c37
1 files changed, 1 insertions, 36 deletions
diff --git a/drivers/lguest/lguest_user.c b/drivers/lguest/lguest_user.c
index d4ac5f846427..b184652e45d7 100644
--- a/drivers/lguest/lguest_user.c
+++ b/drivers/lguest/lguest_user.c
@@ -9,37 +9,6 @@
9#include <linux/fs.h> 9#include <linux/fs.h>
10#include "lg.h" 10#include "lg.h"
11 11
12/*L:030 setup_regs() doesn't really belong in this file, but it gives us an
13 * early glimpse deeper into the Host so it's worth having here.
14 *
15 * Most of the Guest's registers are left alone: we used get_zeroed_page() to
16 * allocate the structure, so they will be 0. */
17static void setup_regs(struct lguest_regs *regs, unsigned long start)
18{
19 /* There are four "segment" registers which the Guest needs to boot:
20 * The "code segment" register (cs) refers to the kernel code segment
21 * __KERNEL_CS, and the "data", "extra" and "stack" segment registers
22 * refer to the kernel data segment __KERNEL_DS.
23 *
24 * The privilege level is packed into the lower bits. The Guest runs
25 * at privilege level 1 (GUEST_PL).*/
26 regs->ds = regs->es = regs->ss = __KERNEL_DS|GUEST_PL;
27 regs->cs = __KERNEL_CS|GUEST_PL;
28
29 /* The "eflags" register contains miscellaneous flags. Bit 1 (0x002)
30 * is supposed to always be "1". Bit 9 (0x200) controls whether
31 * interrupts are enabled. We always leave interrupts enabled while
32 * running the Guest. */
33 regs->eflags = 0x202;
34
35 /* The "Extended Instruction Pointer" register says where the Guest is
36 * running. */
37 regs->eip = start;
38
39 /* %esi points to our boot information, at physical address 0, so don't
40 * touch it. */
41}
42
43/*L:310 To send DMA into the Guest, the Launcher needs to be able to ask for a 12/*L:310 To send DMA into the Guest, the Launcher needs to be able to ask for a
44 * DMA buffer. This is done by writing LHREQ_GETDMA and the key to 13 * DMA buffer. This is done by writing LHREQ_GETDMA and the key to
45 * /dev/lguest. */ 14 * /dev/lguest. */
@@ -214,11 +183,7 @@ static int initialize(struct file *file, const unsigned long __user *input)
214 183
215 /* Now we initialize the Guest's registers, handing it the start 184 /* Now we initialize the Guest's registers, handing it the start
216 * address. */ 185 * address. */
217 setup_regs(lg->regs, args[3]); 186 lguest_arch_setup_regs(lg, args[3]);
218
219 /* There are a couple of GDT entries the Guest expects when first
220 * booting. */
221 setup_guest_gdt(lg);
222 187
223 /* The timer for lguest's clock needs initialization. */ 188 /* The timer for lguest's clock needs initialization. */
224 init_clockdev(lg); 189 init_clockdev(lg);