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/******************************************************************************
* kernel.c
*
* Assorted crap goes here, including the initial C entry point, jumped at
* from head.S.
*/
#include <os.h>
#include <hypervisor.h>
#include <mm.h>
#include <events.h>
#include <time.h>
#include <types.h>
#include <lib.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);
/* default event handlers */
static void exit_handler(int ev, struct pt_regs *regs);
static void debug_handler(int ev, struct pt_regs *regs);
/*
* INITIAL C ENTRY POINT.
*/
void start_kernel(start_info_t *si)
{
int i;
/* 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 = start_info.shared_info;
/* Set up event and failsafe callback addresses. */
HYPERVISOR_set_callbacks(
__KERNEL_CS, (unsigned long)hypervisor_callback,
__KERNEL_CS, (unsigned long)failsafe_callback);
trap_init();
/* ENABLE EVENT DELIVERY. This is disabled at start of day. */
__sti();
/* print out some useful information */
printk("Xeno Minimal OS!\n");
printk("start_info: %p\n", si);
printk(" nr_pages: %lu", si->nr_pages);
printk(" shared_inf: %p\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(" net_rings: ");
for (i = 0; i < MAX_DOMAIN_VIFS; i++) {
printk(" %lx", si->net_rings[i]);
}; printk("\n");
printk(" blk_ring: 0x%lx\n", si->blk_ring);
printk(" dom_id: %d\n", si->dom_id);
printk(" flags: 0x%lx\n", 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();
/* install some handlers */
add_ev_action(EV_DIE, &exit_handler);
enable_ev_action(EV_DIE);
enable_hypervisor_event(EV_DIE);
add_ev_action(EV_DEBUG, &debug_handler);
enable_ev_action(EV_DEBUG);
enable_hypervisor_event(EV_DEBUG);
/* init time and timers */
init_time();
/* do nothing */
for ( ; ; ) HYPERVISOR_yield();
}
/*
* 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 ( ;; ) ;
}
static void exit_handler(int ev, struct pt_regs *regs) {
do_exit();
}
/*
* a debug handler to print out some state from the guest
*/
static void debug_handler(int ev, struct pt_regs *regs) {
dump_regs(regs);
}
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