1/******************************************************************************
2 * common.c
3 *
4 * Common stuff special to x86 goes here.
5 *
6 * Copyright (c) 2002-2003, K A Fraser & R Neugebauer
7 * Copyright (c) 2005, Grzegorz Milos, Intel Research Cambridge
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a copy
10 * of this software and associated documentation files (the "Software"), to
11 * deal in the Software without restriction, including without limitation the
12 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
13 * sell copies of the Software, and to permit persons to whom the Software is
14 * furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 * DEALINGS IN THE SOFTWARE.
26 *
27 */
28
29#include <mini-os/os.h>
30
31#include <bmk-core/string.h>
32
33/*
34 * Shared page for communicating with the hypervisor.
35 * Events flags go here, for example.
36 */
37shared_info_t *HYPERVISOR_shared_info;
38
39/*
40 * This structure contains start-of-day info, such as pagetable base pointer,
41 * address of the shared_info structure, and things like that.
42 */
43union start_info_union _minios_start_info_union;
44
45/*
46 * Just allocate the kernel stack here. SS:ESP is set up to point here
47 * in head.S.
48 */
49char _minios_stack[2*STACK_SIZE];
50
51extern char _minios_shared_info[PAGE_SIZE];
52
53/* Assembler interface fns in entry.S. */
54extern void _minios_entry_hypervisor_callback(void);
55extern void _minios_entry_failsafe_callback(void);
56
57#if defined(__x86_64__)
58#define __pte(x) ((pte_t) { (x) } )
59#else
60#define __pte(x) ({ unsigned long long _x = (x);        \
61    ((pte_t) {(unsigned long)(_x), (unsigned long)(_x>>32)}); })
62#endif
63
64static
65shared_info_t *map_shared_info(unsigned long pa)
66{
67    int rc;
68
69	if ( (rc = HYPERVISOR_update_va_mapping(
70              (unsigned long)_minios_shared_info, __pte(pa | 7), UVMF_INVLPG)) )
71	{
72		minios_printk("Failed to map shared_info!! rc=%d\n", rc);
73		minios_do_exit();
74	}
75	return (shared_info_t *)_minios_shared_info;
76}
77
78void
79arch_init(start_info_t *si)
80{
81	/* Copy the start_info struct to a globally-accessible area. */
82	/* WARN: don't do printk before here, it uses information from
83	   shared_info. Use xprintk instead. */
84	bmk_memcpy(&start_info, si, sizeof(*si));
85
86	/* set up minimal memory infos */
87	_minios_phys_to_machine_mapping = (unsigned long *)start_info.mfn_list;
88
89	/* Grab the shared_info pointer and put it in a safe place. */
90	HYPERVISOR_shared_info = map_shared_info(start_info.shared_info);
91
92	    /* Set up event and failsafe callback addresses. */
93#ifdef __i386__
94	gdtinit32();
95	HYPERVISOR_set_callbacks(
96		__KERNEL_CS, (unsigned long)_minios_entry_hypervisor_callback,
97		__KERNEL_CS, (unsigned long)_minios_entry_failsafe_callback);
98#else
99	HYPERVISOR_set_callbacks(
100		(unsigned long)_minios_entry_hypervisor_callback,
101		(unsigned long)_minios_entry_failsafe_callback, 0);
102#endif
103
104}
105
106void
107arch_fini(void)
108{
109#ifdef __i386__
110	HYPERVISOR_set_callbacks(0, 0, 0, 0);
111#else
112	HYPERVISOR_set_callbacks(0, 0, 0);
113#endif
114}
115
116void
117arch_print_info(void)
118{
119	minios_printk("  stack:      %p-%p\n", _minios_stack,
120                _minios_stack + sizeof(_minios_stack));
121}
122
123
124