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/******************************************************************************
* common.c
*
* Common stuff special to x86 goes here.
*
* Copyright (c) 2002-2003, K A Fraser & R Neugebauer
* Copyright (c) 2005, Grzegorz Milos, Intel Research Cambridge
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*/
#include <mini-os/os.h>
#include <mini-os/lib.h> /* for printk, memcpy */
/*
* Shared page for communicating with the hypervisor.
* Events flags go here, for example.
*/
shared_info_t *HYPERVISOR_shared_info;
/*
* This structure contains start-of-day info, such as pagetable base pointer,
* address of the shared_info structure, and things like that.
*/
union start_info_union start_info_union;
/*
* Just allocate the kernel stack here. SS:ESP is set up to point here
* in head.S.
*/
char stack[2*STACK_SIZE];
extern char shared_info[PAGE_SIZE];
/* Assembler interface fns in entry.S. */
void hypervisor_callback(void);
void failsafe_callback(void);
#if defined(__x86_64__)
#define __pte(x) ((pte_t) { (x) } )
#else
#define __pte(x) ({ unsigned long long _x = (x); \
((pte_t) {(unsigned long)(_x), (unsigned long)(_x>>32)}); })
#endif
static
shared_info_t *map_shared_info(unsigned long pa)
{
int rc;
if ( (rc = HYPERVISOR_update_va_mapping(
(unsigned long)shared_info, __pte(pa | 7), UVMF_INVLPG)) )
{
printk("Failed to map shared_info!! rc=%d\n", rc);
do_exit();
}
return (shared_info_t *)shared_info;
}
static inline void fpu_init(void) {
asm volatile("fninit");
}
#ifdef __SSE__
static inline void sse_init(void) {
unsigned long status = 0x1f80;
asm volatile("ldmxcsr %0" : : "m" (status));
}
#else
#define sse_init()
#endif
void
arch_init(start_info_t *si)
{
/*Initialize floating point unit */
fpu_init();
/* Initialize SSE */
sse_init();
/* Copy the start_info struct to a globally-accessible area. */
/* WARN: don't do printk before here, it uses information from
shared_info. Use xprintk instead. */
memcpy(&start_info, si, sizeof(*si));
/* set up minimal memory infos */
phys_to_machine_mapping = (unsigned long *)start_info.mfn_list;
/* Grab the shared_info pointer and put it in a safe place. */
HYPERVISOR_shared_info = map_shared_info(start_info.shared_info);
/* Set up event and failsafe callback addresses. */
#ifdef __i386__
HYPERVISOR_set_callbacks(
__KERNEL_CS, (unsigned long)hypervisor_callback,
__KERNEL_CS, (unsigned long)failsafe_callback);
#else
HYPERVISOR_set_callbacks(
(unsigned long)hypervisor_callback,
(unsigned long)failsafe_callback, 0);
#endif
}
void
arch_fini(void)
{
#ifdef __i386__
HYPERVISOR_set_callbacks(0, 0, 0, 0);
#else
HYPERVISOR_set_callbacks(0, 0, 0);
#endif
}
void
arch_print_info(void)
{
printk(" stack: %p-%p\n", stack, stack + sizeof(stack));
}
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