[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/sched.h>
#include <linux/init.h>
#include <linux/dmar.h>
#include <linux/pfn.h>
#include <linux/mm.h>

#include <asm/trampoline.h>
#include <asm/processor.h>
#include <asm/bootparam.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/setup.h>
#include <asm/tboot.h>
#include <asm/e820.h>
#include <asm/io.h>

#include "acpi/realmode/wakeup.h"

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

/* 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 pgd_t *tboot_pg_dir;
static struct mm_struct tboot_mm = {
	.mm_rb          = RB_ROOT,
	.pgd            = swapper_pg_dir,
	.mm_users       = ATOMIC_INIT(2),
	.mm_count       = ATOMIC_INIT(1),
	.mmap_sem       = __RWSEM_INITIALIZER(init_mm.mmap_sem),
	.page_table_lock =  __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
	.mmlist         = LIST_HEAD_INIT(init_mm.mmlist),
	.cpu_vm_mask    = CPU_MASK_ALL,
};

static inline void switch_to_tboot_pt(void)
{
	write_cr3(virt_to_phys(tboot_pg_dir));
}

static int map_tboot_page(unsigned long vaddr, unsigned long pfn,
			  pgprot_t prot)
{
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;

	pgd = pgd_offset(&tboot_mm, vaddr);
	pud = pud_alloc(&tboot_mm, pgd, vaddr);
	if (!pud)
		return -1;
	pmd = pmd_alloc(&tboot_mm, pud, vaddr);
	if (!pmd)
		return -1;
	pte = pte_alloc_map(&tboot_mm, pmd, vaddr);
	if (!pte)
		return -1;
	set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot));
	pte_unmap(pte);
	return 0;
}

static int map_tboot_pages(unsigned long vaddr, unsigned long start_pfn,
			   unsigned long nr)
{
	/* Reuse the original kernel mapping */
	tboot_pg_dir = pgd_alloc(&tboot_mm);
	if (!tboot_pg_dir)
		return -1;

	for (; nr > 0; nr--, vaddr += PAGE_SIZE, start_pfn++) {
		if (map_tboot_page(vaddr, start_pfn, PAGE_KERNEL_EXEC))
			return -1;
	}

	return 0;
}

void tboot_create_trampoline(void)
{
	u32 map_base, map_size;

	if (!tboot_enabled())
		return;

	/* Create identity map for tboot shutdown code. */
	map_base = PFN_DOWN(tboot->tboot_base);
	map_size = PFN_UP(tboot->tboot_size);
	if (map_tboot_pages(map_base << PAGE_SHIFT, map_base, map_size))
		panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n", map_base, map_size);
}

static void set_mac_regions(void)
{
	tboot->num_mac_regions = 3;
	/* S3 resume code */
	tboot->mac_regions[0].start = PFN_PHYS(PFN_DOWN(acpi_wakeup_address));
	tboot->mac_regions[0].size = PFN_UP(WAKEUP_SIZE) << PAGE_SHIFT;
	/* AP trampoline code */
	tboot->mac_regions[1].start =
			PFN_PHYS(PFN_DOWN(virt_to_phys(trampoline_base)));
	tboot->mac_regions[1].size = PFN_UP(TRAMPOLINE_SIZE) << PAGE_SHIFT;
	/* kernel code + data + bss */
	tboot->mac_regions[2].start = PFN_PHYS(PFN_DOWN(virt_to_phys(&_text)));
	tboot->mac_regions[2].size = PFN_PHYS(PFN_UP(virt_to_phys(&_end))) -
				     PFN_PHYS(PFN_DOWN(virt_to_phys(&_text)));
}

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

	if (!tboot_enabled())
		return;

	/*
	 * if we're being called before the 1:1 mapping is set up then just
	 * return and let the normal shutdown happen; this should only be
	 * due to very early panic()
	 */
	if (!tboot_pg_dir)
		return;

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

	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);
}

void 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;

	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;
	tboot->acpi_sinfo.kernel_s3_resume_vector = acpi_wakeup_address;

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

	tboot_shutdown(acpi_shutdown_map[sleep_state]);
}

int tboot_wait_for_aps(int num_aps)
{
	unsigned long timeout;

	if (!tboot_enabled())
		return 0;

	timeout = jiffies + AP_WAIT_TIMEOUT*HZ;
	while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps &&
	       time_before(jiffies, timeout))
		cpu_relax();

	return time_before(jiffies, timeout) ? 0 : 1;
}

/*
 * 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>
	25	#include <linux/sched.h>
	26	#include <linux/init.h>
	27	#include <linux/dmar.h>
	28	#include <linux/pfn.h>
	29	#include <linux/mm.h>
	30
	31	#include <asm/trampoline.h>
	32	#include <asm/processor.h>
	33	#include <asm/bootparam.h>
	34	#include <asm/pgtable.h>
	35	#include <asm/pgalloc.h>
	36	#include <asm/setup.h>
	37	#include <asm/tboot.h>
	38	#include <asm/e820.h>
	39	#include <asm/io.h>
	40
	41	#include "acpi/realmode/wakeup.h"
	42
	43	/* Global pointer to shared data; NULL means no measured launch. */
	44	struct tboot *tboot __read_mostly;
	45
	46	/* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */
	47	#define AP_WAIT_TIMEOUT 1
	48
	49	#undef pr_fmt
	50	#define pr_fmt(fmt) "tboot: " fmt
	51
	52	static u8 tboot_uuid[16] __initdata = TBOOT_UUID;
	53
	54	void __init tboot_probe(void)
	55	{
	56	/* Look for valid page-aligned address for shared page. */
	57	if (!boot_params.tboot_addr)
	58	return;
	59	/*
	60	* also verify that it is mapped as we expect it before calling
	61	* set_fixmap(), to reduce chance of garbage value causing crash
	62	*/
	63	if (!e820_any_mapped(boot_params.tboot_addr,
	64	boot_params.tboot_addr, E820_RESERVED)) {
65	pr_warning("non-0 tboot_addr but it is not of type E820_RESERVED\n");
66	return;
67	}
68
69	/* only a natively booted kernel should be using TXT */
70	if (paravirt_enabled()) {
71	pr_warning("non-0 tboot_addr but pv_ops is enabled\n");
72	return;
73	}
74
75	/* Map and check for tboot UUID. */
76	set_fixmap(FIX_TBOOT_BASE, boot_params.tboot_addr);
77	tboot = (struct tboot *)fix_to_virt(FIX_TBOOT_BASE);
78	if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) {
79	pr_warning("tboot at 0x%llx is invalid\n",
80	boot_params.tboot_addr);
81	tboot = NULL;
82	return;
83	}
84	if (tboot->version < 5) {
85	pr_warning("tboot version is invalid: %u\n", tboot->version);
86	tboot = NULL;
87	return;
88	}
89
90	pr_info("found shared page at phys addr 0x%llx:\n",
91	boot_params.tboot_addr);
92	pr_debug("version: %d\n", tboot->version);
93	pr_debug("log_addr: 0x%08x\n", tboot->log_addr);
94	pr_debug("shutdown_entry: 0x%x\n", tboot->shutdown_entry);
95	pr_debug("tboot_base: 0x%08x\n", tboot->tboot_base);
96	pr_debug("tboot_size: 0x%x\n", tboot->tboot_size);
97	}
98
99	static pgd_t *tboot_pg_dir;
100	static struct mm_struct tboot_mm = {
101	.mm_rb = RB_ROOT,
102	.pgd = swapper_pg_dir,
103	.mm_users = ATOMIC_INIT(2),
104	.mm_count = ATOMIC_INIT(1),
105	.mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem),
106	.page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
107	.mmlist = LIST_HEAD_INIT(init_mm.mmlist),
108	.cpu_vm_mask = CPU_MASK_ALL,
109	};
110
111	static inline void switch_to_tboot_pt(void)
112	{
113	write_cr3(virt_to_phys(tboot_pg_dir));
114	}
115
116	static int map_tboot_page(unsigned long vaddr, unsigned long pfn,
117	pgprot_t prot)
118	{
119	pgd_t *pgd;
120	pud_t *pud;
121	pmd_t *pmd;
122	pte_t *pte;
123
124	pgd = pgd_offset(&tboot_mm, vaddr);
125	pud = pud_alloc(&tboot_mm, pgd, vaddr);
126	if (!pud)
127	return -1;
128	pmd = pmd_alloc(&tboot_mm, pud, vaddr);
129	if (!pmd)
130	return -1;
131	pte = pte_alloc_map(&tboot_mm, pmd, vaddr);
132	if (!pte)
133	return -1;
134	set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot));
135	pte_unmap(pte);
136	return 0;
137	}
138
139	static int map_tboot_pages(unsigned long vaddr, unsigned long start_pfn,
140	unsigned long nr)
141	{
142	/* Reuse the original kernel mapping */
143	tboot_pg_dir = pgd_alloc(&tboot_mm);
144	if (!tboot_pg_dir)
145	return -1;
146
147	for (; nr > 0; nr--, vaddr += PAGE_SIZE, start_pfn++) {
148	if (map_tboot_page(vaddr, start_pfn, PAGE_KERNEL_EXEC))
149	return -1;
150	}
151
152	return 0;
153	}
154
155	void tboot_create_trampoline(void)
156	{
157	u32 map_base, map_size;
158
159	if (!tboot_enabled())
160	return;
161
162	/* Create identity map for tboot shutdown code. */
163	map_base = PFN_DOWN(tboot->tboot_base);
164	map_size = PFN_UP(tboot->tboot_size);
165	if (map_tboot_pages(map_base << PAGE_SHIFT, map_base, map_size))
166	panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n", map_base, map_size);
167	}
168
169	static void set_mac_regions(void)
170	{
171	tboot->num_mac_regions = 3;
172	/* S3 resume code */
173	tboot->mac_regions[0].start = PFN_PHYS(PFN_DOWN(acpi_wakeup_address));
174	tboot->mac_regions[0].size = PFN_UP(WAKEUP_SIZE) << PAGE_SHIFT;
175	/* AP trampoline code */
176	tboot->mac_regions[1].start =
177	PFN_PHYS(PFN_DOWN(virt_to_phys(trampoline_base)));
178	tboot->mac_regions[1].size = PFN_UP(TRAMPOLINE_SIZE) << PAGE_SHIFT;
179	/* kernel code + data + bss */
180	tboot->mac_regions[2].start = PFN_PHYS(PFN_DOWN(virt_to_phys(&_text)));
181	tboot->mac_regions[2].size = PFN_PHYS(PFN_UP(virt_to_phys(&_end))) -
182	PFN_PHYS(PFN_DOWN(virt_to_phys(&_text)));
183	}
184
185	void tboot_shutdown(u32 shutdown_type)
186	{
187	void (*shutdown)(void);
188
189	if (!tboot_enabled())
190	return;
191
192	/*
193	* if we're being called before the 1:1 mapping is set up then just
194	* return and let the normal shutdown happen; this should only be
195	* due to very early panic()
196	*/
197	if (!tboot_pg_dir)
198	return;
199
200	/* if this is S3 then set regions to MAC */
201	if (shutdown_type == TB_SHUTDOWN_S3)
202	set_mac_regions();
203
204	tboot->shutdown_type = shutdown_type;
205
206	switch_to_tboot_pt();
207
208	shutdown = (void(*)(void))(unsigned long)tboot->shutdown_entry;
209	shutdown();
210
211	/* should not reach here */
212	while (1)
213	halt();
214	}
215
216	static void tboot_copy_fadt(const struct acpi_table_fadt *fadt)
217	{
218	#define TB_COPY_GAS(tbg, g) \
219	tbg.space_id = g.space_id; \
220	tbg.bit_width = g.bit_width; \
221	tbg.bit_offset = g.bit_offset; \
222	tbg.access_width = g.access_width; \
223	tbg.address = g.address;
224
225	TB_COPY_GAS(tboot->acpi_sinfo.pm1a_cnt_blk, fadt->xpm1a_control_block);
226	TB_COPY_GAS(tboot->acpi_sinfo.pm1b_cnt_blk, fadt->xpm1b_control_block);
227	TB_COPY_GAS(tboot->acpi_sinfo.pm1a_evt_blk, fadt->xpm1a_event_block);
228	TB_COPY_GAS(tboot->acpi_sinfo.pm1b_evt_blk, fadt->xpm1b_event_block);
229
230	/*
231	* We need phys addr of waking vector, but can't use virt_to_phys() on
232	* &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys
233	* addr.
234	*/
235	tboot->acpi_sinfo.wakeup_vector = fadt->facs +
236	offsetof(struct acpi_table_facs, firmware_waking_vector);
237	}
238
239	void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
240	{
241	static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = {
242	/* S0,1,2: */ -1, -1, -1,
243	/* S3: */ TB_SHUTDOWN_S3,
244	/* S4: */ TB_SHUTDOWN_S4,
245	/* S5: */ TB_SHUTDOWN_S5 };
246
247	if (!tboot_enabled())
248	return;
249
250	tboot_copy_fadt(&acpi_gbl_FADT);
251	tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control;
252	tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control;
253	/* we always use the 32b wakeup vector */
254	tboot->acpi_sinfo.vector_width = 32;
255	tboot->acpi_sinfo.kernel_s3_resume_vector = acpi_wakeup_address;
256
257	if (sleep_state >= ACPI_S_STATE_COUNT \|\|
258	acpi_shutdown_map[sleep_state] == -1) {
259	pr_warning("unsupported sleep state 0x%x\n", sleep_state);
260	return;
261	}
262
263	tboot_shutdown(acpi_shutdown_map[sleep_state]);
264	}
265
266	int tboot_wait_for_aps(int num_aps)
267	{
268	unsigned long timeout;
269
270	if (!tboot_enabled())
271	return 0;
272
273	timeout = jiffies + AP_WAIT_TIMEOUT*HZ;
274	while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps &&
275	time_before(jiffies, timeout))
276	cpu_relax();
277
278	return time_before(jiffies, timeout) ? 0 : 1;
279	}
280
281	/*
282	* TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE)
283	*/
284
285	#define TXT_PUB_CONFIG_REGS_BASE 0xfed30000
286	#define TXT_PRIV_CONFIG_REGS_BASE 0xfed20000
287
288	/* # pages for each config regs space - used by fixmap */
289	#define NR_TXT_CONFIG_PAGES ((TXT_PUB_CONFIG_REGS_BASE - \
290	TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT)
291
292	/* offsets from pub/priv config space */
293	#define TXTCR_HEAP_BASE 0x0300
294	#define TXTCR_HEAP_SIZE 0x0308
295
296	#define SHA1_SIZE 20
297
298	struct sha1_hash {
299	u8 hash[SHA1_SIZE];
300	};
301
302	struct sinit_mle_data {
303	u32 version; /* currently 6 */
304	struct sha1_hash bios_acm_id;
305	u32 edx_senter_flags;
306	u64 mseg_valid;
307	struct sha1_hash sinit_hash;
308	struct sha1_hash mle_hash;
309	struct sha1_hash stm_hash;
310	struct sha1_hash lcp_policy_hash;
311	u32 lcp_policy_control;
312	u32 rlp_wakeup_addr;
313	u32 reserved;
314	u32 num_mdrs;
315	u32 mdrs_off;
316	u32 num_vtd_dmars;
317	u32 vtd_dmars_off;
318	} __packed;
319
320	struct acpi_table_header tboot_get_dmar_table(struct acpi_table_header dmar_tbl)
321	{
322	void heap_base, heap_ptr, *config;
323
324	if (!tboot_enabled())
325	return dmar_tbl;
326
327	/*
328	* ACPI tables may not be DMA protected by tboot, so use DMAR copy
329	* SINIT saved in SinitMleData in TXT heap (which is DMA protected)
330	*/
331
332	/* map config space in order to get heap addr */
333	config = ioremap(TXT_PUB_CONFIG_REGS_BASE, NR_TXT_CONFIG_PAGES *
334	PAGE_SIZE);
335	if (!config)
336	return NULL;
337
338	/* now map TXT heap */
339	heap_base = ioremap((u64 )(config + TXTCR_HEAP_BASE),
340	(u64 )(config + TXTCR_HEAP_SIZE));
341	iounmap(config);
342	if (!heap_base)
343	return NULL;
344
345	/* walk heap to SinitMleData */
346	/* skip BiosData */
347	heap_ptr = heap_base + (u64 )heap_base;
348	/* skip OsMleData */
349	heap_ptr += (u64 )heap_ptr;
350	/* skip OsSinitData */
351	heap_ptr += (u64 )heap_ptr;
352	/* now points to SinitMleDataSize; set to SinitMleData */
353	heap_ptr += sizeof(u64);
354	/* get addr of DMAR table */
355	dmar_tbl = (struct acpi_table_header *)(heap_ptr +
356	((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off -
357	sizeof(u64));
358
359	/* don't unmap heap because dmar.c needs access to this */
360
361	return dmar_tbl;
362	}
363
364	int tboot_force_iommu(void)
365	{
366	if (!tboot_enabled())
367	return 0;
368
369	if (no_iommu \|\| swiotlb \|\| dmar_disabled)
370	pr_warning("Forcing Intel-IOMMU to enabled\n");
371
372	dmar_disabled = 0;
373	#ifdef CONFIG_SWIOTLB
374	swiotlb = 0;
375	#endif
376	no_iommu = 0;
377
378	return 1;
379	}