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/******************************************************************************
* kernel.c
*
* Assorted crap goes here, including the initial C entry point, jumped at
* from head.S.
*
* 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 <os.h>
#include <hypervisor.h>
#include <mm.h>
#include <events.h>
#include <time.h>
#include <types.h>
#include <lib.h>
#include <sched.h>
#include <xenbus.h>
#include "xenbus/xenbus_comms.h"
/*
* 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[8192];
/* Assembler interface fns in entry.S. */
void hypervisor_callback(void);
void failsafe_callback(void);
extern char shared_info[PAGE_SIZE];
#define __pte(x) ((pte_t) { (x) } )
static shared_info_t *map_shared_info(unsigned long pa)
{
if ( HYPERVISOR_update_va_mapping(
(unsigned long)shared_info, __pte(pa | 7), UVMF_INVLPG) )
{
printk("Failed to map shared_info!!\n");
*(int*)0=0;
}
return (shared_info_t *)shared_info;
}
/*
* INITIAL C ENTRY POINT.
*/
void start_kernel(start_info_t *si)
{
static char hello[] = "Bootstrapping...\n";
(void)HYPERVISOR_console_io(CONSOLEIO_write, strlen(hello), hello);
/* Copy the start_info struct to a globally-accessible area. */
memcpy(&start_info, si, sizeof(*si));
/* 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
trap_init();
/* ENABLE EVENT DELIVERY. This is disabled at start of day. */
__sti();
/* print out some useful information */
printk("Xen Minimal OS!\n");
printk("start_info: %p\n", si);
printk(" nr_pages: %lu", si->nr_pages);
printk(" shared_inf: %08lx\n", si->shared_info);
printk(" pt_base: %p", (void *)si->pt_base);
printk(" mod_start: 0x%lx\n", si->mod_start);
printk(" mod_len: %lu\n", si->mod_len);
printk(" flags: 0x%x\n", (unsigned int)si->flags);
printk(" cmd_line: %s\n",
si->cmd_line ? (const char *)si->cmd_line : "NULL");
/*
* If used for porting another OS, start here to figure out your
* guest os entry point. Otherwise continue below...
*/
/* init memory management */
init_mm();
/* set up events */
init_events();
/* init time and timers */
init_time();
/* init scheduler */
init_sched();
/* init xenbus */
xs_init();
/* Everything initialised, start idle thread */
run_idle_thread();
}
/*
* do_exit: This is called whenever an IRET fails in entry.S.
* This will generally be because an application has got itself into
* a really bad state (probably a bad CS or SS). It must be killed.
* Of course, minimal OS doesn't have applications :-)
*/
void do_exit(void)
{
printk("do_exit called!\n");
for ( ;; ) HYPERVISOR_sched_op(SCHEDOP_shutdown, SHUTDOWN_crash);
}
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