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Move register setup into i386_core.c

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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>
This commit is contained in:
Jes Sorensen 2007-10-22 11:03:32 +10:00 committed by Rusty Russell
parent 511801dc31
commit d612cde060
3 changed files with 38 additions and 36 deletions
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1
drivers/lguest/lg.h
View File

@ -199,6 +199,7 @@ void lguest_arch_run_guest(struct lguest *lg);
void lguest_arch_handle_trap(struct lguest *lg);
int lguest_arch_init_hypercalls(struct lguest *lg);
int lguest_arch_do_hcall(struct lguest *lg, struct hcall_args *args);
void lguest_arch_setup_regs(struct lguest *lg, unsigned long start);
/* <arch>/switcher.S: */
extern char start_switcher_text[], end_switcher_text[], switch_to_guest[];

37
drivers/lguest/lguest_user.c
View File

@ -9,37 +9,6 @@
#include <linux/fs.h>
#include "lg.h"
/*L:030 setup_regs() doesn't really belong in this file, but it gives us an
* early glimpse deeper into the Host so it's worth having here.
*
* Most of the Guest's registers are left alone: we used get_zeroed_page() to
* allocate the structure, so they will be 0. */
static void setup_regs(struct lguest_regs *regs, unsigned long start)
{
/* There are four "segment" registers which the Guest needs to boot:
* The "code segment" register (cs) refers to the kernel code segment
* __KERNEL_CS, and the "data", "extra" and "stack" segment registers
* refer to the kernel data segment __KERNEL_DS.
*
* The privilege level is packed into the lower bits. The Guest runs
* at privilege level 1 (GUEST_PL).*/
regs->ds = regs->es = regs->ss = __KERNEL_DS|GUEST_PL;
regs->cs = __KERNEL_CS|GUEST_PL;
/* The "eflags" register contains miscellaneous flags. Bit 1 (0x002)
* is supposed to always be "1". Bit 9 (0x200) controls whether
* interrupts are enabled. We always leave interrupts enabled while
* running the Guest. */
regs->eflags = 0x202;
/* The "Extended Instruction Pointer" register says where the Guest is
* running. */
regs->eip = start;
/* %esi points to our boot information, at physical address 0, so don't
* touch it. */
}
/*L:310 To send DMA into the Guest, the Launcher needs to be able to ask for a
* DMA buffer. This is done by writing LHREQ_GETDMA and the key to
* /dev/lguest. */
@ -214,11 +183,7 @@ static int initialize(struct file *file, const unsigned long __user *input)
/* Now we initialize the Guest's registers, handing it the start
* address. */
setup_regs(lg->regs, args[3]);
/* There are a couple of GDT entries the Guest expects when first
* booting. */
setup_guest_gdt(lg);
lguest_arch_setup_regs(lg, args[3]);
/* The timer for lguest's clock needs initialization. */
init_clockdev(lg);

36
drivers/lguest/x86/core.c
View File

@ -535,3 +535,39 @@ int lguest_arch_init_hypercalls(struct lguest *lg)
/* Now we've examined the hypercall code; our Guest can make requests. There
* is one other way we can do things for the Guest, as we see in
* emulate_insn(). :*/
/*L:030 lguest_arch_setup_regs()
*
* Most of the Guest's registers are left alone: we used get_zeroed_page() to
* allocate the structure, so they will be 0. */
void lguest_arch_setup_regs(struct lguest *lg, unsigned long start)
{
struct lguest_regs *regs = lg->regs;
/* There are four "segment" registers which the Guest needs to boot:
* The "code segment" register (cs) refers to the kernel code segment
* __KERNEL_CS, and the "data", "extra" and "stack" segment registers
* refer to the kernel data segment __KERNEL_DS.
*
* The privilege level is packed into the lower bits. The Guest runs
* at privilege level 1 (GUEST_PL).*/
regs->ds = regs->es = regs->ss = __KERNEL_DS|GUEST_PL;
regs->cs = __KERNEL_CS|GUEST_PL;
/* The "eflags" register contains miscellaneous flags. Bit 1 (0x002)
* is supposed to always be "1". Bit 9 (0x200) controls whether
* interrupts are enabled. We always leave interrupts enabled while
* running the Guest. */
regs->eflags = 0x202;
/* The "Extended Instruction Pointer" register says where the Guest is
* running. */
regs->eip = start;
/* %esi points to our boot information, at physical address 0, so don't
* touch it. */
/* There are a couple of GDT entries the Guest expects when first
* booting. */
setup_guest_gdt(lg);
}