[linux-2.6-block.git] / arch / x86 / kernel / tboot.c

/*
 * tboot.c: main implementation of helper functions used by kernel for
 *          runtime support of Intel(R) Trusted Execution Technology
 *
 * Copyright (c) 2006-2009, Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

#include <linux/dma_remapping.h>
#include <linux/init_task.h>
#include <linux/spinlock.h>
#include <linux/export.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/dmar.h>
#include <linux/cpu.h>
#include <linux/pfn.h>
#include <linux/mm.h>
#include <linux/tboot.h>

#include <asm/realmode.h>
#include <asm/processor.h>
#include <asm/bootparam.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/swiotlb.h>
#include <asm/fixmap.h>
#include <asm/proto.h>
#include <asm/setup.h>
#include <asm/e820.h>
#include <asm/io.h>

#include "../realmode/rm/wakeup.h"

/* Global pointer to shared data; NULL means no measured launch. */
struct tboot *tboot __read_mostly;
EXPORT_SYMBOL(tboot);

/* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */
#define AP_WAIT_TIMEOUT		1

#undef pr_fmt
#define pr_fmt(fmt)	"tboot: " fmt

static u8 tboot_uuid[16] __initdata = TBOOT_UUID;

void __init tboot_probe(void)
{
	/* Look for valid page-aligned address for shared page. */
	if (!boot_params.tboot_addr)
		return;
	/*
	 * also verify that it is mapped as we expect it before calling
	 * set_fixmap(), to reduce chance of garbage value causing crash
	 */
	if (!e820_any_mapped(boot_params.tboot_addr,
			     boot_params.tboot_addr, E820_RESERVED)) {
		pr_warning("non-0 tboot_addr but it is not of type E820_RESERVED\n");
		return;
	}

	/* only a natively booted kernel should be using TXT */
	if (paravirt_enabled()) {
		pr_warning("non-0 tboot_addr but pv_ops is enabled\n");
		return;
	}

	/* Map and check for tboot UUID. */
	set_fixmap(FIX_TBOOT_BASE, boot_params.tboot_addr);
	tboot = (struct tboot *)fix_to_virt(FIX_TBOOT_BASE);
	if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) {
		pr_warning("tboot at 0x%llx is invalid\n",
			   boot_params.tboot_addr);
		tboot = NULL;
		return;
	}
	if (tboot->version < 5) {
		pr_warning("tboot version is invalid: %u\n", tboot->version);
		tboot = NULL;
		return;
	}

	pr_info("found shared page at phys addr 0x%llx:\n",
		boot_params.tboot_addr);
	pr_debug("version: %d\n", tboot->version);
	pr_debug("log_addr: 0x%08x\n", tboot->log_addr);
	pr_debug("shutdown_entry: 0x%x\n", tboot->shutdown_entry);
	pr_debug("tboot_base: 0x%08x\n", tboot->tboot_base);
	pr_debug("tboot_size: 0x%x\n", tboot->tboot_size);
}

static inline void switch_to_tboot_pt(void)
{
#ifdef CONFIG_X86_32
	load_cr3(initial_page_table);
#else
	write_cr3(real_mode_header->trampoline_pgd);
#endif
}

#ifdef CONFIG_ACPI_SLEEP

static void add_mac_region(phys_addr_t start, unsigned long size)
{
	struct tboot_mac_region *mr;
	phys_addr_t end = start + size;

	if (tboot->num_mac_regions >= MAX_TB_MAC_REGIONS)
		panic("tboot: Too many MAC regions\n");

	if (start && size) {
		mr = &tboot->mac_regions[tboot->num_mac_regions++];
		mr->start = round_down(start, PAGE_SIZE);
		mr->size  = round_up(end, PAGE_SIZE) - mr->start;
	}
}

static int tboot_setup_sleep(void)
{
	int i;

	tboot->num_mac_regions = 0;

	for (i = 0; i < e820.nr_map; i++) {
		if ((e820.map[i].type != E820_RAM)
		 && (e820.map[i].type != E820_RESERVED_KERN))
			continue;

		add_mac_region(e820.map[i].addr, e820.map[i].size);
	}

	tboot->acpi_sinfo.kernel_s3_resume_vector =
		real_mode_header->wakeup_start;

	return 0;
}

#else /* no CONFIG_ACPI_SLEEP */

static int tboot_setup_sleep(void)
{
	/* S3 shutdown requested, but S3 not supported by the kernel... */
	BUG();
	return -1;
}

#endif

void tboot_shutdown(u32 shutdown_type)
{
	void (*shutdown)(void);

	if (!tboot_enabled())
		return;

	/* if this is S3 then set regions to MAC */
	if (shutdown_type == TB_SHUTDOWN_S3)
		if (tboot_setup_sleep())
			return;

	tboot->shutdown_type = shutdown_type;

	switch_to_tboot_pt();

	shutdown = (void(*)(void))(unsigned long)tboot->shutdown_entry;
	shutdown();

	/* should not reach here */
	while (1)
		halt();
}

static void tboot_copy_fadt(const struct acpi_table_fadt *fadt)
{
#define TB_COPY_GAS(tbg, g)			\
	tbg.space_id     = g.space_id;		\
	tbg.bit_width    = g.bit_width;		\
	tbg.bit_offset   = g.bit_offset;	\
	tbg.access_width = g.access_width;	\
	tbg.address      = g.address;

	TB_COPY_GAS(tboot->acpi_sinfo.pm1a_cnt_blk, fadt->xpm1a_control_block);
	TB_COPY_GAS(tboot->acpi_sinfo.pm1b_cnt_blk, fadt->xpm1b_control_block);
	TB_COPY_GAS(tboot->acpi_sinfo.pm1a_evt_blk, fadt->xpm1a_event_block);
	TB_COPY_GAS(tboot->acpi_sinfo.pm1b_evt_blk, fadt->xpm1b_event_block);

	/*
	 * We need phys addr of waking vector, but can't use virt_to_phys() on
	 * &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys
	 * addr.
	 */
	tboot->acpi_sinfo.wakeup_vector = fadt->facs +
		offsetof(struct acpi_table_facs, firmware_waking_vector);
}

static int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
{
	static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = {
		/* S0,1,2: */ -1, -1, -1,
		/* S3: */ TB_SHUTDOWN_S3,
		/* S4: */ TB_SHUTDOWN_S4,
		/* S5: */ TB_SHUTDOWN_S5 };

	if (!tboot_enabled())
		return 0;

	tboot_copy_fadt(&acpi_gbl_FADT);
	tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control;
	tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control;
	/* we always use the 32b wakeup vector */
	tboot->acpi_sinfo.vector_width = 32;

	if (sleep_state >= ACPI_S_STATE_COUNT ||
	    acpi_shutdown_map[sleep_state] == -1) {
		pr_warning("unsupported sleep state 0x%x\n", sleep_state);
		return -1;
	}

	tboot_shutdown(acpi_shutdown_map[sleep_state]);
	return 0;
}

static atomic_t ap_wfs_count;

static int tboot_wait_for_aps(int num_aps)
{
	unsigned long timeout;

	timeout = AP_WAIT_TIMEOUT*HZ;
	while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps &&
	       timeout) {
		mdelay(1);
		timeout--;
	}

	if (timeout)
		pr_warning("tboot wait for APs timeout\n");

	return !(atomic_read((atomic_t *)&tboot->num_in_wfs) == num_aps);
}

static int __cpuinit tboot_cpu_callback(struct notifier_block *nfb,
			unsigned long action, void *hcpu)
{
	switch (action) {
	case CPU_DYING:
		atomic_inc(&ap_wfs_count);
		if (num_online_cpus() == 1)
			if (tboot_wait_for_aps(atomic_read(&ap_wfs_count)))
				return NOTIFY_BAD;
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block tboot_cpu_notifier __cpuinitdata =
{
	.notifier_call = tboot_cpu_callback,
};

static __init int tboot_late_init(void)
{
	if (!tboot_enabled())
		return 0;

	atomic_set(&ap_wfs_count, 0);
	register_hotcpu_notifier(&tboot_cpu_notifier);

	acpi_os_set_prepare_sleep(&tboot_sleep);
	return 0;
}

late_initcall(tboot_late_init);

/*
 * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE)
 */

#define TXT_PUB_CONFIG_REGS_BASE       0xfed30000
#define TXT_PRIV_CONFIG_REGS_BASE      0xfed20000

/* # pages for each config regs space - used by fixmap */
#define NR_TXT_CONFIG_PAGES     ((TXT_PUB_CONFIG_REGS_BASE -                \
				  TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT)

/* offsets from pub/priv config space */
#define TXTCR_HEAP_BASE             0x0300
#define TXTCR_HEAP_SIZE             0x0308

#define SHA1_SIZE      20

struct sha1_hash {
	u8 hash[SHA1_SIZE];
};

struct sinit_mle_data {
	u32               version;             /* currently 6 */
	struct sha1_hash  bios_acm_id;
	u32               edx_senter_flags;
	u64               mseg_valid;
	struct sha1_hash  sinit_hash;
	struct sha1_hash  mle_hash;
	struct sha1_hash  stm_hash;
	struct sha1_hash  lcp_policy_hash;
	u32               lcp_policy_control;
	u32               rlp_wakeup_addr;
	u32               reserved;
	u32               num_mdrs;
	u32               mdrs_off;
	u32               num_vtd_dmars;
	u32               vtd_dmars_off;
} __packed;

struct acpi_table_header *tboot_get_dmar_table(struct acpi_table_header *dmar_tbl)
{
	void *heap_base, *heap_ptr, *config;

	if (!tboot_enabled())
		return dmar_tbl;

	/*
	 * ACPI tables may not be DMA protected by tboot, so use DMAR copy
	 * SINIT saved in SinitMleData in TXT heap (which is DMA protected)
	 */

	/* map config space in order to get heap addr */
	config = ioremap(TXT_PUB_CONFIG_REGS_BASE, NR_TXT_CONFIG_PAGES *
			 PAGE_SIZE);
	if (!config)
		return NULL;

	/* now map TXT heap */
	heap_base = ioremap(*(u64 *)(config + TXTCR_HEAP_BASE),
			    *(u64 *)(config + TXTCR_HEAP_SIZE));
	iounmap(config);
	if (!heap_base)
		return NULL;

	/* walk heap to SinitMleData */
	/* skip BiosData */
	heap_ptr = heap_base + *(u64 *)heap_base;
	/* skip OsMleData */
	heap_ptr += *(u64 *)heap_ptr;
	/* skip OsSinitData */
	heap_ptr += *(u64 *)heap_ptr;
	/* now points to SinitMleDataSize; set to SinitMleData */
	heap_ptr += sizeof(u64);
	/* get addr of DMAR table */
	dmar_tbl = (struct acpi_table_header *)(heap_ptr +
		   ((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off -
		   sizeof(u64));

	/* don't unmap heap because dmar.c needs access to this */

	return dmar_tbl;
}

int tboot_force_iommu(void)
{
	if (!tboot_enabled())
		return 0;

	if (no_iommu || swiotlb || dmar_disabled)
		pr_warning("Forcing Intel-IOMMU to enabled\n");

	dmar_disabled = 0;
#ifdef CONFIG_SWIOTLB
	swiotlb = 0;
#endif
	no_iommu = 0;

	return 1;
}
Commit	Line	Data
31625340 JC	1	/*
	2	* tboot.c: main implementation of helper functions used by kernel for
	3	* runtime support of Intel(R) Trusted Execution Technology
	4	*
	5	* Copyright (c) 2006-2009, Intel Corporation
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms and conditions of the GNU General Public License,
	9	* version 2, as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope it will be useful, but WITHOUT
	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	14	* more details.
	15	*
	16	* You should have received a copy of the GNU General Public License along with
	17	* this program; if not, write to the Free Software Foundation, Inc.,
	18	* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	19	*
	20	*/
	21
	22	#include <linux/dma_remapping.h>
	23	#include <linux/init_task.h>
	24	#include <linux/spinlock.h>
69c60c88	25	#include <linux/export.h>
69575d38	26	#include <linux/delay.h>
31625340 JC	27	#include <linux/sched.h>
	28	#include <linux/init.h>
	29	#include <linux/dmar.h>
69575d38	30	#include <linux/cpu.h>
31625340 JC	31	#include <linux/pfn.h>
31625340 JC	32	#include <linux/mm.h>
69575d38	33	#include <linux/tboot.h>
31625340	34
c9b77ccb	35	#include <asm/realmode.h>
31625340 JC	36	#include <asm/processor.h>
	37	#include <asm/bootparam.h>
	38	#include <asm/pgtable.h>
	39	#include <asm/pgalloc.h>
b7f080cf	40	#include <asm/swiotlb.h>
81e2d7b3	41	#include <asm/fixmap.h>
58c41d28	42	#include <asm/proto.h>
31625340	43	#include <asm/setup.h>
31625340 JC	44	#include <asm/e820.h>
	45	#include <asm/io.h>
	46
bf8b88e9	47	#include "../realmode/rm/wakeup.h"
31625340 JC	48
	49	/* Global pointer to shared data; NULL means no measured launch. */
	50	struct tboot *tboot __read_mostly;
cafd6659	51	EXPORT_SYMBOL(tboot);
31625340 JC	52
	53	/* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */
	54	#define AP_WAIT_TIMEOUT 1
	55
	56	#undef pr_fmt
	57	#define pr_fmt(fmt) "tboot: " fmt
	58
	59	static u8 tboot_uuid[16] __initdata = TBOOT_UUID;
	60
	61	void __init tboot_probe(void)
	62	{
	63	/* Look for valid page-aligned address for shared page. */
	64	if (!boot_params.tboot_addr)
	65	return;
	66	/*
	67	* also verify that it is mapped as we expect it before calling
	68	* set_fixmap(), to reduce chance of garbage value causing crash
	69	*/
	70	if (!e820_any_mapped(boot_params.tboot_addr,
	71	boot_params.tboot_addr, E820_RESERVED)) {
	72	pr_warning("non-0 tboot_addr but it is not of type E820_RESERVED\n");
	73	return;
	74	}
	75
	76	/* only a natively booted kernel should be using TXT */
	77	if (paravirt_enabled()) {
	78	pr_warning("non-0 tboot_addr but pv_ops is enabled\n");
	79	return;
	80	}
	81
	82	/* Map and check for tboot UUID. */
	83	set_fixmap(FIX_TBOOT_BASE, boot_params.tboot_addr);
	84	tboot = (struct tboot *)fix_to_virt(FIX_TBOOT_BASE);
	85	if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) {
	86	pr_warning("tboot at 0x%llx is invalid\n",
	87	boot_params.tboot_addr);
	88	tboot = NULL;
	89	return;
	90	}
	91	if (tboot->version < 5) {
	92	pr_warning("tboot version is invalid: %u\n", tboot->version);
	93	tboot = NULL;
	94	return;
	95	}
	96
	97	pr_info("found shared page at phys addr 0x%llx:\n",
	98	boot_params.tboot_addr);
	99	pr_debug("version: %d\n", tboot->version);
	100	pr_debug("log_addr: 0x%08x\n", tboot->log_addr);
	101	pr_debug("shutdown_entry: 0x%x\n", tboot->shutdown_entry);
	102	pr_debug("tboot_base: 0x%08x\n", tboot->tboot_base);
	103	pr_debug("tboot_size: 0x%x\n", tboot->tboot_size);
	104	}
	105
31625340 JC	106	static inline void switch_to_tboot_pt(void)
31625340 JC	107	{
da5a108d XZ	108	#ifdef CONFIG_X86_32
	109	load_cr3(initial_page_table);
	110	#else
	111	write_cr3(real_mode_header->trampoline_pgd);
	112	#endif
31625340 JC	113	}
31625340 JC	114
58c41d28 PA	115	#ifdef CONFIG_ACPI_SLEEP
	116
	117	static void add_mac_region(phys_addr_t start, unsigned long size)
31625340	118	{
58c41d28 PA	119	struct tboot_mac_region *mr;
	120	phys_addr_t end = start + size;
	121
4bd96a7a SW	122	if (tboot->num_mac_regions >= MAX_TB_MAC_REGIONS)
	123	panic("tboot: Too many MAC regions\n");
	124
58c41d28 PA	125	if (start && size) {
	126	mr = &tboot->mac_regions[tboot->num_mac_regions++];
	127	mr->start = round_down(start, PAGE_SIZE);
	128	mr->size = round_up(end, PAGE_SIZE) - mr->start;
	129	}
	130	}
	131
	132	static int tboot_setup_sleep(void)
	133	{
4bd96a7a SW	134	int i;
4bd96a7a SW	135
58c41d28 PA	136	tboot->num_mac_regions = 0;
58c41d28 PA	137
4bd96a7a SW	138	for (i = 0; i < e820.nr_map; i++) {
	139	if ((e820.map[i].type != E820_RAM)
	140	&& (e820.map[i].type != E820_RESERVED_KERN))
	141	continue;
62a3207b	142
4bd96a7a SW	143	add_mac_region(e820.map[i].addr, e820.map[i].size);
4bd96a7a SW	144	}
58c41d28	145
c9b77ccb	146	tboot->acpi_sinfo.kernel_s3_resume_vector =
b429dbf6	147	real_mode_header->wakeup_start;
58c41d28 PA	148
	149	return 0;
	150	}
	151
	152	#else /* no CONFIG_ACPI_SLEEP */
	153
	154	static int tboot_setup_sleep(void)
	155	{
	156	/* S3 shutdown requested, but S3 not supported by the kernel... */
	157	BUG();
	158	return -1;
31625340 JC	159	}
31625340 JC	160
58c41d28 PA	161	#endif
58c41d28 PA	162
31625340 JC	163	void tboot_shutdown(u32 shutdown_type)
	164	{
	165	void (*shutdown)(void);
	166
	167	if (!tboot_enabled())
	168	return;
	169
31625340 JC	170	/* if this is S3 then set regions to MAC */
31625340 JC	171	if (shutdown_type == TB_SHUTDOWN_S3)
58c41d28 PA	172	if (tboot_setup_sleep())
58c41d28 PA	173	return;
31625340 JC	174
	175	tboot->shutdown_type = shutdown_type;
	176
	177	switch_to_tboot_pt();
	178
	179	shutdown = (void(*)(void))(unsigned long)tboot->shutdown_entry;
	180	shutdown();
	181
	182	/* should not reach here */
	183	while (1)
	184	halt();
	185	}
	186
	187	static void tboot_copy_fadt(const struct acpi_table_fadt *fadt)
	188	{
	189	#define TB_COPY_GAS(tbg, g) \
	190	tbg.space_id = g.space_id; \
	191	tbg.bit_width = g.bit_width; \
	192	tbg.bit_offset = g.bit_offset; \
	193	tbg.access_width = g.access_width; \
	194	tbg.address = g.address;
	195
	196	TB_COPY_GAS(tboot->acpi_sinfo.pm1a_cnt_blk, fadt->xpm1a_control_block);
	197	TB_COPY_GAS(tboot->acpi_sinfo.pm1b_cnt_blk, fadt->xpm1b_control_block);
	198	TB_COPY_GAS(tboot->acpi_sinfo.pm1a_evt_blk, fadt->xpm1a_event_block);
	199	TB_COPY_GAS(tboot->acpi_sinfo.pm1b_evt_blk, fadt->xpm1b_event_block);
	200
	201	/*
	202	* We need phys addr of waking vector, but can't use virt_to_phys() on
	203	* &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys
	204	* addr.
	205	*/
	206	tboot->acpi_sinfo.wakeup_vector = fadt->facs +
	207	offsetof(struct acpi_table_facs, firmware_waking_vector);
	208	}
	209
a1f37788	210	static int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
31625340 JC	211	{
	212	static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = {
	213	/* S0,1,2: */ -1, -1, -1,
	214	/* S3: */ TB_SHUTDOWN_S3,
	215	/* S4: */ TB_SHUTDOWN_S4,
	216	/* S5: */ TB_SHUTDOWN_S5 };
	217
	218	if (!tboot_enabled())
a1f37788	219	return 0;
31625340 JC	220
	221	tboot_copy_fadt(&acpi_gbl_FADT);
	222	tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control;
	223	tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control;
	224	/* we always use the 32b wakeup vector */
	225	tboot->acpi_sinfo.vector_width = 32;
31625340 JC	226
	227	if (sleep_state >= ACPI_S_STATE_COUNT \|\|
	228	acpi_shutdown_map[sleep_state] == -1) {
	229	pr_warning("unsupported sleep state 0x%x\n", sleep_state);
a1f37788	230	return -1;
31625340 JC	231	}
	232
	233	tboot_shutdown(acpi_shutdown_map[sleep_state]);
09f98a82 TL	234	return 0;
09f98a82 TL	235	}
31625340	236
69575d38 SW	237	static atomic_t ap_wfs_count;
	238
	239	static int tboot_wait_for_aps(int num_aps)
31625340 JC	240	{
	241	unsigned long timeout;
	242
69575d38 SW	243	timeout = AP_WAIT_TIMEOUT*HZ;
	244	while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps &&
	245	timeout) {
	246	mdelay(1);
	247	timeout--;
	248	}
	249
	250	if (timeout)
	251	pr_warning("tboot wait for APs timeout\n");
	252
	253	return !(atomic_read((atomic_t *)&tboot->num_in_wfs) == num_aps);
	254	}
	255
	256	static int __cpuinit tboot_cpu_callback(struct notifier_block *nfb,
	257	unsigned long action, void *hcpu)
	258	{
	259	switch (action) {
	260	case CPU_DYING:
	261	atomic_inc(&ap_wfs_count);
	262	if (num_online_cpus() == 1)
	263	if (tboot_wait_for_aps(atomic_read(&ap_wfs_count)))
	264	return NOTIFY_BAD;
	265	break;
	266	}
	267	return NOTIFY_OK;
	268	}
	269
	270	static struct notifier_block tboot_cpu_notifier __cpuinitdata =
	271	{
	272	.notifier_call = tboot_cpu_callback,
	273	};
	274
	275	static __init int tboot_late_init(void)
	276	{
31625340 JC	277	if (!tboot_enabled())
	278	return 0;
	279
69575d38 SW	280	atomic_set(&ap_wfs_count, 0);
69575d38 SW	281	register_hotcpu_notifier(&tboot_cpu_notifier);
09f98a82	282
a1f37788	283	acpi_os_set_prepare_sleep(&tboot_sleep);
69575d38	284	return 0;
31625340 JC	285	}
31625340 JC	286
69575d38 SW	287	late_initcall(tboot_late_init);
69575d38 SW	288
31625340 JC	289	/*
	290	* TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE)
	291	*/
	292
	293	#define TXT_PUB_CONFIG_REGS_BASE 0xfed30000
	294	#define TXT_PRIV_CONFIG_REGS_BASE 0xfed20000
	295
	296	/* # pages for each config regs space - used by fixmap */
	297	#define NR_TXT_CONFIG_PAGES ((TXT_PUB_CONFIG_REGS_BASE - \
	298	TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT)
	299
	300	/* offsets from pub/priv config space */
	301	#define TXTCR_HEAP_BASE 0x0300
	302	#define TXTCR_HEAP_SIZE 0x0308
	303
	304	#define SHA1_SIZE 20
	305
	306	struct sha1_hash {
	307	u8 hash[SHA1_SIZE];
	308	};
	309
	310	struct sinit_mle_data {
	311	u32 version; /* currently 6 */
	312	struct sha1_hash bios_acm_id;
	313	u32 edx_senter_flags;
	314	u64 mseg_valid;
	315	struct sha1_hash sinit_hash;
	316	struct sha1_hash mle_hash;
	317	struct sha1_hash stm_hash;
	318	struct sha1_hash lcp_policy_hash;
	319	u32 lcp_policy_control;
	320	u32 rlp_wakeup_addr;
	321	u32 reserved;
	322	u32 num_mdrs;
	323	u32 mdrs_off;
	324	u32 num_vtd_dmars;
	325	u32 vtd_dmars_off;
	326	} __packed;
	327
	328	struct acpi_table_header tboot_get_dmar_table(struct acpi_table_header dmar_tbl)
	329	{
	330	void heap_base, heap_ptr, *config;
	331
	332	if (!tboot_enabled())
	333	return dmar_tbl;
	334
	335	/*
	336	* ACPI tables may not be DMA protected by tboot, so use DMAR copy
	337	* SINIT saved in SinitMleData in TXT heap (which is DMA protected)
	338	*/
	339
	340	/* map config space in order to get heap addr */
	341	config = ioremap(TXT_PUB_CONFIG_REGS_BASE, NR_TXT_CONFIG_PAGES *
	342	PAGE_SIZE);
	343	if (!config)
	344	return NULL;
	345
	346	/* now map TXT heap */
	347	heap_base = ioremap((u64 )(config + TXTCR_HEAP_BASE),
	348	(u64 )(config + TXTCR_HEAP_SIZE));
	349	iounmap(config);
	350	if (!heap_base)
	351	return NULL;
	352
353	/* walk heap to SinitMleData */
354	/* skip BiosData */
355	heap_ptr = heap_base + (u64 )heap_base;
356	/* skip OsMleData */
357	heap_ptr += (u64 )heap_ptr;
358	/* skip OsSinitData */
359	heap_ptr += (u64 )heap_ptr;
360	/* now points to SinitMleDataSize; set to SinitMleData */
361	heap_ptr += sizeof(u64);
362	/* get addr of DMAR table */
363	dmar_tbl = (struct acpi_table_header *)(heap_ptr +
364	((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off -
365	sizeof(u64));
366
367	/* don't unmap heap because dmar.c needs access to this */
368
369	return dmar_tbl;
370	}
371
372	int tboot_force_iommu(void)
373	{
374	if (!tboot_enabled())
375	return 0;
376
377	if (no_iommu \|\| swiotlb \|\| dmar_disabled)
378	pr_warning("Forcing Intel-IOMMU to enabled\n");
379
380	dmar_disabled = 0;
381	#ifdef CONFIG_SWIOTLB
382	swiotlb = 0;
383	#endif
384	no_iommu = 0;
385
386	return 1;
387	}