acpi_wakeup.c revision 133155 
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 133155 2004-08-05 06:29:12Z njl $");
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/pmap.h>
41#include <vm/vm_object.h>
42#include <vm/vm_page.h>
43#include <vm/vm_map.h>
44
45#include <machine/bus.h>
46#include <machine/cpufunc.h>
47#include <machine/intr_machdep.h>
48#include <machine/segments.h>
49
50#include "acpi.h"
51#include <dev/acpica/acpivar.h>
52
53#include "acpi_wakecode.h"
54
55extern uint32_t	acpi_reset_video;
56extern void	initializecpu(void);
57
58static struct region_descriptor	r_idt, r_gdt, *p_gdt;
59static uint16_t		r_ldt;
60
61static uint32_t		r_eax, r_ebx, r_ecx, r_edx, r_ebp, r_esi, r_edi,
62			r_efl, r_cr0, r_cr2, r_cr3, r_cr4, ret_addr;
63
64static uint16_t		r_cs, r_ds, r_es, r_fs, r_gs, r_ss, r_tr;
65static uint32_t		r_esp = 0;
66
67static void		acpi_printcpu(void);
68static void		acpi_realmodeinst(void *arg, bus_dma_segment_t *segs,
69					  int nsegs, int error);
70static void		acpi_alloc_wakeup_handler(void);
71
72/* XXX shut gcc up */
73extern int		acpi_savecpu(void);
74extern int		acpi_restorecpu(void);
75
76#if defined(__GNUC__) || defined(__INTEL_COMPILER)
77__asm__("				\n\
78	.text				\n\
79	.p2align 2, 0x90		\n\
80	.type acpi_restorecpu, @function\n\
81acpi_restorecpu:			\n\
82	.align 4			\n\
83	movl	r_eax,%eax		\n\
84	movl	r_ebx,%ebx		\n\
85	movl	r_ecx,%ecx		\n\
86	movl	r_edx,%edx		\n\
87	movl	r_ebp,%ebp		\n\
88	movl	r_esi,%esi		\n\
89	movl	r_edi,%edi		\n\
90	movl	r_esp,%esp		\n\
91					\n\
92	pushl	r_efl			\n\
93	popfl				\n\
94					\n\
95	movl	ret_addr,%eax		\n\
96	movl	%eax,(%esp)		\n\
97	xorl	%eax,%eax		\n\
98	ret				\n\
99					\n\
100	.text				\n\
101	.p2align 2, 0x90		\n\
102	.type acpi_savecpu, @function	\n\
103acpi_savecpu:				\n\
104	movw	%cs,r_cs		\n\
105	movw	%ds,r_ds		\n\
106	movw	%es,r_es		\n\
107	movw	%fs,r_fs		\n\
108	movw	%gs,r_gs		\n\
109	movw	%ss,r_ss		\n\
110					\n\
111	movl	%eax,r_eax		\n\
112	movl	%ebx,r_ebx		\n\
113	movl	%ecx,r_ecx		\n\
114	movl	%edx,r_edx		\n\
115	movl	%ebp,r_ebp		\n\
116	movl	%esi,r_esi		\n\
117	movl	%edi,r_edi		\n\
118					\n\
119	movl	%cr0,%eax		\n\
120	movl	%eax,r_cr0		\n\
121	movl	%cr2,%eax		\n\
122	movl	%eax,r_cr2		\n\
123	movl	%cr3,%eax		\n\
124	movl	%eax,r_cr3		\n\
125	movl	%cr4,%eax		\n\
126	movl	%eax,r_cr4		\n\
127					\n\
128	pushfl				\n\
129	popl	r_efl			\n\
130					\n\
131	movl	%esp,r_esp		\n\
132					\n\
133	sgdt	r_gdt			\n\
134	sidt	r_idt			\n\
135	sldt	r_ldt			\n\
136	str	r_tr			\n\
137					\n\
138	movl	(%esp),%eax		\n\
139	movl	%eax,ret_addr		\n\
140	movl	$1,%eax			\n\
141	ret				\n\
142");
143#endif /* __GNUC__ || __INTEL_COMPILER */
144
145static void
146acpi_printcpu(void)
147{
148	printf("======== acpi_printcpu() debug dump ========\n");
149	printf("gdt[%04x:%08x] idt[%04x:%08x] ldt[%04x] tr[%04x] efl[%08x]\n",
150		r_gdt.rd_limit, r_gdt.rd_base, r_idt.rd_limit, r_idt.rd_base,
151		r_ldt, r_tr, r_efl);
152	printf("eax[%08x] ebx[%08x] ecx[%08x] edx[%08x]\n",
153		r_eax, r_ebx, r_ecx, r_edx);
154	printf("esi[%08x] edi[%08x] ebp[%08x] esp[%08x]\n",
155		r_esi, r_edi, r_ebp, r_esp);
156	printf("cr0[%08x] cr2[%08x] cr3[%08x] cr4[%08x]\n",
157		r_cr0, r_cr2, r_cr3, r_cr4);
158	printf("cs[%04x] ds[%04x] es[%04x] fs[%04x] gs[%04x] ss[%04x]\n",
159		r_cs, r_ds, r_es, r_fs, r_gs, r_ss);
160}
161
162#define WAKECODE_FIXUP(offset, type, val) do	{		\
163	type	*addr;						\
164	addr = (type *)(sc->acpi_wakeaddr + offset);		\
165	*addr = val;						\
166} while (0)
167
168#define WAKECODE_BCOPY(offset, type, val) do	{		\
169	void	*addr;						\
170	addr = (void *)(sc->acpi_wakeaddr + offset);		\
171	bcopy(&(val), addr, sizeof(type));			\
172} while (0)
173
174int
175acpi_sleep_machdep(struct acpi_softc *sc, int state)
176{
177	ACPI_STATUS		status;
178	struct pmap		*pm;
179	vm_page_t		page;
180	int			ret;
181	uint32_t		cr3;
182	u_long			ef;
183	struct proc		*p;
184
185	ret = 0;
186	if (sc->acpi_wakeaddr == 0)
187		return (0);
188
189	AcpiSetFirmwareWakingVector(sc->acpi_wakephys);
190
191	ef = read_eflags();
192	ACPI_DISABLE_IRQS();
193
194	/* Create Identity Mapping */
195	if ((p = curproc) == NULL)
196		p = &proc0;
197	pm = vmspace_pmap(p->p_vmspace);
198	cr3 = rcr3();
199#ifdef PAE
200	load_cr3(vtophys(pm->pm_pdpt));
201#else
202	load_cr3(vtophys(pm->pm_pdir));
203#endif
204
205	page = PHYS_TO_VM_PAGE(sc->acpi_wakephys);
206	pmap_enter(pm, sc->acpi_wakephys, page,
207		   VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE, 1);
208
209	ret_addr = 0;
210	if (acpi_savecpu()) {
211		/* Execute Sleep */
212		intr_suspend();
213
214		p_gdt = (struct region_descriptor *)
215				(sc->acpi_wakeaddr + physical_gdt);
216		p_gdt->rd_limit = r_gdt.rd_limit;
217		p_gdt->rd_base = vtophys(r_gdt.rd_base);
218
219		WAKECODE_FIXUP(physical_esp, uint32_t, vtophys(r_esp));
220		WAKECODE_FIXUP(previous_cr0, uint32_t, r_cr0);
221		WAKECODE_FIXUP(previous_cr2, uint32_t, r_cr2);
222		WAKECODE_FIXUP(previous_cr3, uint32_t, r_cr3);
223		WAKECODE_FIXUP(previous_cr4, uint32_t, r_cr4);
224
225		WAKECODE_FIXUP(reset_video, uint32_t, acpi_reset_video);
226
227		WAKECODE_FIXUP(previous_tr,  uint16_t, r_tr);
228		WAKECODE_BCOPY(previous_gdt, struct region_descriptor, r_gdt);
229		WAKECODE_FIXUP(previous_ldt, uint16_t, r_ldt);
230		WAKECODE_BCOPY(previous_idt, struct region_descriptor, r_idt);
231
232		WAKECODE_FIXUP(where_to_recover, void *, acpi_restorecpu);
233
234		WAKECODE_FIXUP(previous_ds,  uint16_t, r_ds);
235		WAKECODE_FIXUP(previous_es,  uint16_t, r_es);
236		WAKECODE_FIXUP(previous_fs,  uint16_t, r_fs);
237		WAKECODE_FIXUP(previous_gs,  uint16_t, r_gs);
238		WAKECODE_FIXUP(previous_ss,  uint16_t, r_ss);
239
240		if (bootverbose)
241			acpi_printcpu();
242
243		/* Call ACPICA to enter the desired sleep state */
244		if (state == ACPI_STATE_S4 && sc->acpi_s4bios)
245			status = AcpiEnterSleepStateS4bios();
246		else
247			status = AcpiEnterSleepState(state);
248
249		if (status != AE_OK) {
250			device_printf(sc->acpi_dev,
251				"AcpiEnterSleepState failed - %s\n",
252				AcpiFormatException(status));
253			ret = -1;
254			goto out;
255		}
256
257		for (;;) ;
258	} else {
259		/* Execute Wakeup */
260		intr_resume();
261
262		if (bootverbose) {
263			acpi_savecpu();
264			acpi_printcpu();
265		}
266	}
267
268out:
269	pmap_remove(pm, sc->acpi_wakephys, sc->acpi_wakephys + PAGE_SIZE);
270	load_cr3(cr3);
271	write_eflags(ef);
272
273	return (ret);
274}
275
276static bus_dma_tag_t	acpi_waketag;
277static bus_dmamap_t	acpi_wakemap;
278static vm_offset_t	acpi_wakeaddr = 0;
279
280static void
281acpi_alloc_wakeup_handler(void)
282{
283	void *wakeaddr;
284
285	if (!cold)
286		return;
287
288	if (bus_dma_tag_create(/* parent */ NULL, /* alignment */ 2, 0,
289			       /* lowaddr below 1MB */ 0x9ffff,
290			       /* highaddr */ BUS_SPACE_MAXADDR, NULL, NULL,
291				PAGE_SIZE, 1, PAGE_SIZE, 0, busdma_lock_mutex,
292				&Giant, &acpi_waketag) != 0) {
293		printf("acpi_alloc_wakeup_handler: can't create wake tag\n");
294		return;
295	}
296	if (bus_dmamem_alloc(acpi_waketag, &wakeaddr,
297			     BUS_DMA_NOWAIT, &acpi_wakemap)) {
298		printf("acpi_alloc_wakeup_handler: can't alloc wake memory\n");
299		return;
300	}
301	acpi_wakeaddr = (vm_offset_t)wakeaddr;
302}
303
304SYSINIT(acpiwakeup, SI_SUB_KMEM, SI_ORDER_ANY, acpi_alloc_wakeup_handler, 0)
305
306static void
307acpi_realmodeinst(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
308{
309	struct acpi_softc	*sc = arg;
310	uint32_t		*addr;
311
312	addr = (uint32_t *)&wakecode[wakeup_sw32 + 2];
313	*addr = segs[0].ds_addr + wakeup_32;
314	bcopy(wakecode, (void *)sc->acpi_wakeaddr, sizeof(wakecode));
315	sc->acpi_wakephys = segs[0].ds_addr;
316}
317
318void
319acpi_install_wakeup_handler(struct acpi_softc *sc)
320{
321	if (acpi_wakeaddr == 0)
322		return;
323
324	sc->acpi_waketag = acpi_waketag;
325	sc->acpi_wakeaddr = acpi_wakeaddr;
326	sc->acpi_wakemap = acpi_wakemap;
327
328	bus_dmamap_load(sc->acpi_waketag, sc->acpi_wakemap,
329			(void *)sc->acpi_wakeaddr, PAGE_SIZE,
330			acpi_realmodeinst, sc, 0);
331}
332