acpi_wakeup.c revision 120424 
1/*-
2 * Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org>
3 * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/sys/i386/acpica/acpi_wakeup.c 120424 2003-09-25 02:51:06Z alc $");
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/kernel.h>
34#include <sys/bus.h>
35#include <sys/lock.h>
36#include <sys/proc.h>
37#include <sys/sysctl.h>
38
39#include <vm/vm.h>
40#include <vm/vm_param.h>
41#include <vm/pmap.h>
42#include <vm/vm_object.h>
43#include <vm/vm_page.h>
44#include <vm/vm_map.h>
45#include <vm/vm_kern.h>
46#include <vm/vm_extern.h>
47
48#include <machine/bus.h>
49#include <machine/cpufunc.h>
50#include <machine/segments.h>
51
52#include <i386/isa/intr_machdep.h>
53
54#include "acpi.h"
55#include <dev/acpica/acpivar.h>
56
57#include "acpi_wakecode.h"
58
59#if __FreeBSD_version < 500000
60#define	vm_page_lock_queues()
61#define	vm_page_unlock_queues()
62#endif
63
64extern void initializecpu(void);
65
66static struct region_descriptor	r_idt, r_gdt, *p_gdt;
67static u_int16_t	r_ldt;
68
69static u_int32_t	r_eax, r_ebx, r_ecx, r_edx, r_ebp, r_esi, r_edi,
70			r_efl, r_cr0, r_cr2, r_cr3, r_cr4, ret_addr;
71
72static u_int16_t	r_cs, r_ds, r_es, r_fs, r_gs, r_ss, r_tr;
73static u_int32_t	r_esp = 0;
74
75static void		acpi_printcpu(void);
76static void		acpi_realmodeinst(void *arg, bus_dma_segment_t *segs,
77					  int nsegs, int error);
78static void		acpi_alloc_wakeup_handler(void);
79
80/* XXX shut gcc up */
81extern int		acpi_savecpu(void);
82extern int		acpi_restorecpu(void);
83
84#ifdef __GNUC__
85__asm__("				\n\
86	.text				\n\
87	.p2align 2, 0x90		\n\
88	.type acpi_restorecpu, @function\n\
89acpi_restorecpu:			\n\
90	.align 4			\n\
91	movl	r_eax,%eax		\n\
92	movl	r_ebx,%ebx		\n\
93	movl	r_ecx,%ecx		\n\
94	movl	r_edx,%edx		\n\
95	movl	r_ebp,%ebp		\n\
96	movl	r_esi,%esi		\n\
97	movl	r_edi,%edi		\n\
98	movl	r_esp,%esp		\n\
99					\n\
100	pushl	r_efl			\n\
101	popfl				\n\
102					\n\
103	movl	ret_addr,%eax		\n\
104	movl	%eax,(%esp)		\n\
105	xorl	%eax,%eax		\n\
106	ret				\n\
107					\n\
108	.text				\n\
109	.p2align 2, 0x90		\n\
110	.type acpi_savecpu, @function	\n\
111acpi_savecpu:				\n\
112	movw	%cs,r_cs		\n\
113	movw	%ds,r_ds		\n\
114	movw	%es,r_es		\n\
115	movw	%fs,r_fs		\n\
116	movw	%gs,r_gs		\n\
117	movw	%ss,r_ss		\n\
118					\n\
119	movl	%eax,r_eax		\n\
120	movl	%ebx,r_ebx		\n\
121	movl	%ecx,r_ecx		\n\
122	movl	%edx,r_edx		\n\
123	movl	%ebp,r_ebp		\n\
124	movl	%esi,r_esi		\n\
125	movl	%edi,r_edi		\n\
126					\n\
127	movl	%cr0,%eax		\n\
128	movl	%eax,r_cr0		\n\
129	movl	%cr2,%eax		\n\
130	movl	%eax,r_cr2		\n\
131	movl	%cr3,%eax		\n\
132	movl	%eax,r_cr3		\n\
133	movl	%cr4,%eax		\n\
134	movl	%eax,r_cr4		\n\
135					\n\
136	pushfl				\n\
137	popl	r_efl			\n\
138					\n\
139	movl	%esp,r_esp		\n\
140					\n\
141	sgdt	r_gdt			\n\
142	sidt	r_idt			\n\
143	sldt	r_ldt			\n\
144	str	r_tr			\n\
145					\n\
146	movl	(%esp),%eax		\n\
147	movl	%eax,ret_addr		\n\
148	movl	$1,%eax			\n\
149	ret				\n\
150");
151#endif /* __GNUC__ */
152
153static void
154acpi_printcpu(void)
155{
156	printf("======== acpi_printcpu() debug dump ========\n");
157	printf("gdt[%04x:%08x] idt[%04x:%08x] ldt[%04x] tr[%04x] efl[%08x]\n",
158		r_gdt.rd_limit, r_gdt.rd_base, r_idt.rd_limit, r_idt.rd_base,
159		r_ldt, r_tr, r_efl);
160	printf("eax[%08x] ebx[%08x] ecx[%08x] edx[%08x]\n",
161		r_eax, r_ebx, r_ecx, r_edx);
162	printf("esi[%08x] edi[%08x] ebp[%08x] esp[%08x]\n",
163		r_esi, r_edi, r_ebp, r_esp);
164	printf("cr0[%08x] cr2[%08x] cr3[%08x] cr4[%08x]\n",
165		r_cr0, r_cr2, r_cr3, r_cr4);
166	printf("cs[%04x] ds[%04x] es[%04x] fs[%04x] gs[%04x] ss[%04x]\n",
167		r_cs, r_ds, r_es, r_fs, r_gs, r_ss);
168}
169
170#define WAKECODE_FIXUP(offset, type, val) do	{		\
171	void	**addr;						\
172	addr = (void **)(sc->acpi_wakeaddr + offset);		\
173	(type *)*addr = val;					\
174} while (0)
175
176#define WAKECODE_BCOPY(offset, type, val) do	{		\
177	void	**addr;						\
178	addr = (void **)(sc->acpi_wakeaddr + offset);		\
179	bcopy(&(val), addr, sizeof(type));			\
180} while (0)
181
182int
183acpi_sleep_machdep(struct acpi_softc *sc, int state)
184{
185	ACPI_STATUS		status;
186	vm_paddr_t		oldphys;
187	struct pmap		*pm;
188	vm_page_t		page;
189	static vm_page_t	opage = NULL;
190	int			ret = 0;
191	u_int32_t		cr3;
192	u_long			ef;
193	struct proc		*p;
194
195	if (sc->acpi_wakeaddr == 0)
196		return (0);
197
198	AcpiSetFirmwareWakingVector(sc->acpi_wakephys);
199
200	ef = read_eflags();
201	ACPI_DISABLE_IRQS();
202
203	/* Create Identity Mapping */
204	if ((p = curproc) == NULL)
205		p = &proc0;
206	pm = vmspace_pmap(p->p_vmspace);
207	cr3 = rcr3();
208#ifdef PAE
209	load_cr3(vtophys(pm->pm_pdpt));
210#else
211	load_cr3(vtophys(pm->pm_pdir));
212#endif
213
214	oldphys = pmap_extract(pm, sc->acpi_wakephys);
215	if (oldphys)
216		opage = PHYS_TO_VM_PAGE(oldphys);
217	page = PHYS_TO_VM_PAGE(sc->acpi_wakephys);
218	pmap_enter(pm, sc->acpi_wakephys, page,
219		   VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE, 1);
220
221	ret_addr = 0;
222	if (acpi_savecpu()) {
223		/* Execute Sleep */
224		p_gdt = (struct region_descriptor *)
225				(sc->acpi_wakeaddr + physical_gdt);
226		p_gdt->rd_limit = r_gdt.rd_limit;
227		p_gdt->rd_base = vtophys(r_gdt.rd_base);
228
229		WAKECODE_FIXUP(physical_esp, u_int32_t, vtophys(r_esp));
230		WAKECODE_FIXUP(previous_cr0, u_int32_t, r_cr0);
231		WAKECODE_FIXUP(previous_cr2, u_int32_t, r_cr2);
232		WAKECODE_FIXUP(previous_cr3, u_int32_t, r_cr3);
233		WAKECODE_FIXUP(previous_cr4, u_int32_t, r_cr4);
234
235		WAKECODE_FIXUP(previous_tr,  u_int16_t, r_tr);
236		WAKECODE_BCOPY(previous_gdt, struct region_descriptor, r_gdt);
237		WAKECODE_FIXUP(previous_ldt, u_int16_t, r_ldt);
238		WAKECODE_BCOPY(previous_idt, struct region_descriptor, r_idt);
239
240		WAKECODE_FIXUP(where_to_recover, void, acpi_restorecpu);
241
242		WAKECODE_FIXUP(previous_ds,  u_int16_t, r_ds);
243		WAKECODE_FIXUP(previous_es,  u_int16_t, r_es);
244		WAKECODE_FIXUP(previous_fs,  u_int16_t, r_fs);
245		WAKECODE_FIXUP(previous_gs,  u_int16_t, r_gs);
246		WAKECODE_FIXUP(previous_ss,  u_int16_t, r_ss);
247
248		if (acpi_get_verbose(sc))
249			acpi_printcpu();
250
251		/* Call ACPICA to enter the desired sleep state */
252		if (state == ACPI_STATE_S4 && sc->acpi_s4bios)
253			status = AcpiEnterSleepStateS4bios();
254		else
255			status = AcpiEnterSleepState(state);
256
257		if (status != AE_OK) {
258			device_printf(sc->acpi_dev,
259				"AcpiEnterSleepState failed - %s\n",
260				AcpiFormatException(status));
261			ret = -1;
262			goto out;
263		}
264
265		for (;;) ;
266	} else {
267		/* Execute Wakeup */
268#if 0
269		initializecpu();
270#endif
271		icu_reinit();
272
273		if (acpi_get_verbose(sc)) {
274			acpi_savecpu();
275			acpi_printcpu();
276		}
277	}
278
279out:
280	vm_page_lock_queues();
281	pmap_remove(pm, sc->acpi_wakephys, sc->acpi_wakephys + PAGE_SIZE);
282	vm_page_unlock_queues();
283	if (opage) {
284		pmap_enter(pm, sc->acpi_wakephys, page,
285			   VM_PROT_READ | VM_PROT_WRITE, 0);
286	}
287
288	load_cr3(cr3);
289
290	write_eflags(ef);
291
292	return (ret);
293}
294
295static bus_dma_tag_t	acpi_waketag;
296static bus_dmamap_t	acpi_wakemap;
297static vm_offset_t	acpi_wakeaddr = 0;
298
299static void
300acpi_alloc_wakeup_handler(void)
301{
302	if (!cold)
303		return;
304
305	if (bus_dma_tag_create(/* parent */ NULL, /* alignment */ 2, 0,
306			       /* lowaddr below 1MB */ 0x9ffff,
307			       /* highaddr */ BUS_SPACE_MAXADDR, NULL, NULL,
308				PAGE_SIZE, 1, PAGE_SIZE, 0, busdma_lock_mutex,
309				&Giant, &acpi_waketag) != 0) {
310		printf("acpi_alloc_wakeup_handler: can't create wake tag\n");
311		return;
312	}
313
314	if (bus_dmamem_alloc(acpi_waketag, (void **)&acpi_wakeaddr,
315			     BUS_DMA_NOWAIT, &acpi_wakemap)) {
316		printf("acpi_alloc_wakeup_handler: can't alloc wake memory\n");
317		return;
318	}
319}
320
321SYSINIT(acpiwakeup, SI_SUB_KMEM, SI_ORDER_ANY, acpi_alloc_wakeup_handler, 0)
322
323static void
324acpi_realmodeinst(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
325{
326	struct acpi_softc	*sc = arg;
327	u_int32_t		*addr;
328
329	addr = (u_int32_t *)&wakecode[wakeup_sw32 + 2];
330	*addr = segs[0].ds_addr + wakeup_32;
331	bcopy(wakecode, (void *)sc->acpi_wakeaddr, sizeof(wakecode));
332	sc->acpi_wakephys = segs[0].ds_addr;
333}
334
335void
336acpi_install_wakeup_handler(struct acpi_softc *sc)
337{
338	if (acpi_wakeaddr == 0)
339		return;
340
341	sc->acpi_waketag = acpi_waketag;
342	sc->acpi_wakeaddr = acpi_wakeaddr;
343	sc->acpi_wakemap = acpi_wakemap;
344
345	bus_dmamap_load(sc->acpi_waketag, sc->acpi_wakemap,
346			(void *)sc->acpi_wakeaddr, PAGE_SIZE,
347			acpi_realmodeinst, sc, 0);
348}
349