2 * tboot.c: main implementation of helper functions used by kernel for
3 * runtime support of Intel(R) Trusted Execution Technology
5 * Copyright (c) 2006-2009, Intel Corporation
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.
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
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.
22 #include <linux/dma_remapping.h>
23 #include <linux/init_task.h>
24 #include <linux/spinlock.h>
25 #include <linux/export.h>
26 #include <linux/delay.h>
27 #include <linux/sched.h>
28 #include <linux/init.h>
29 #include <linux/dmar.h>
30 #include <linux/cpu.h>
31 #include <linux/pfn.h>
33 #include <linux/tboot.h>
35 #include <asm/trampoline.h>
36 #include <asm/processor.h>
37 #include <asm/bootparam.h>
38 #include <asm/pgtable.h>
39 #include <asm/pgalloc.h>
40 #include <asm/swiotlb.h>
41 #include <asm/fixmap.h>
42 #include <asm/proto.h>
43 #include <asm/setup.h>
47 #include "acpi/realmode/wakeup.h"
49 /* Global pointer to shared data; NULL means no measured launch. */
50 struct tboot
*tboot __read_mostly
;
53 /* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */
54 #define AP_WAIT_TIMEOUT 1
57 #define pr_fmt(fmt) "tboot: " fmt
59 static u8 tboot_uuid
[16] __initdata
= TBOOT_UUID
;
61 void __init
tboot_probe(void)
63 /* Look for valid page-aligned address for shared page. */
64 if (!boot_params
.tboot_addr
)
67 * also verify that it is mapped as we expect it before calling
68 * set_fixmap(), to reduce chance of garbage value causing crash
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");
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");
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
);
91 if (tboot
->version
< 5) {
92 pr_warning("tboot version is invalid: %u\n", tboot
->version
);
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
);
106 static pgd_t
*tboot_pg_dir
;
107 static struct mm_struct tboot_mm
= {
109 .pgd
= swapper_pg_dir
,
110 .mm_users
= ATOMIC_INIT(2),
111 .mm_count
= ATOMIC_INIT(1),
112 .mmap_sem
= __RWSEM_INITIALIZER(init_mm
.mmap_sem
),
113 .page_table_lock
= __SPIN_LOCK_UNLOCKED(init_mm
.page_table_lock
),
114 .mmlist
= LIST_HEAD_INIT(init_mm
.mmlist
),
117 static inline void switch_to_tboot_pt(void)
119 write_cr3(virt_to_phys(tboot_pg_dir
));
122 static int map_tboot_page(unsigned long vaddr
, unsigned long pfn
,
130 pgd
= pgd_offset(&tboot_mm
, vaddr
);
131 pud
= pud_alloc(&tboot_mm
, pgd
, vaddr
);
134 pmd
= pmd_alloc(&tboot_mm
, pud
, vaddr
);
137 pte
= pte_alloc_map(&tboot_mm
, NULL
, pmd
, vaddr
);
140 set_pte_at(&tboot_mm
, vaddr
, pte
, pfn_pte(pfn
, prot
));
145 static int map_tboot_pages(unsigned long vaddr
, unsigned long start_pfn
,
148 /* Reuse the original kernel mapping */
149 tboot_pg_dir
= pgd_alloc(&tboot_mm
);
153 for (; nr
> 0; nr
--, vaddr
+= PAGE_SIZE
, start_pfn
++) {
154 if (map_tboot_page(vaddr
, start_pfn
, PAGE_KERNEL_EXEC
))
161 static void tboot_create_trampoline(void)
163 u32 map_base
, map_size
;
165 /* Create identity map for tboot shutdown code. */
166 map_base
= PFN_DOWN(tboot
->tboot_base
);
167 map_size
= PFN_UP(tboot
->tboot_size
);
168 if (map_tboot_pages(map_base
<< PAGE_SHIFT
, map_base
, map_size
))
169 panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n",
173 #ifdef CONFIG_ACPI_SLEEP
175 static void add_mac_region(phys_addr_t start
, unsigned long size
)
177 struct tboot_mac_region
*mr
;
178 phys_addr_t end
= start
+ size
;
180 if (tboot
->num_mac_regions
>= MAX_TB_MAC_REGIONS
)
181 panic("tboot: Too many MAC regions\n");
184 mr
= &tboot
->mac_regions
[tboot
->num_mac_regions
++];
185 mr
->start
= round_down(start
, PAGE_SIZE
);
186 mr
->size
= round_up(end
, PAGE_SIZE
) - mr
->start
;
190 static int tboot_setup_sleep(void)
194 tboot
->num_mac_regions
= 0;
196 for (i
= 0; i
< e820
.nr_map
; i
++) {
197 if ((e820
.map
[i
].type
!= E820_RAM
)
198 && (e820
.map
[i
].type
!= E820_RESERVED_KERN
))
201 add_mac_region(e820
.map
[i
].addr
, e820
.map
[i
].size
);
204 tboot
->acpi_sinfo
.kernel_s3_resume_vector
= acpi_wakeup_address
;
209 #else /* no CONFIG_ACPI_SLEEP */
211 static int tboot_setup_sleep(void)
213 /* S3 shutdown requested, but S3 not supported by the kernel... */
220 void tboot_shutdown(u32 shutdown_type
)
222 void (*shutdown
)(void);
224 if (!tboot_enabled())
228 * if we're being called before the 1:1 mapping is set up then just
229 * return and let the normal shutdown happen; this should only be
230 * due to very early panic()
235 /* if this is S3 then set regions to MAC */
236 if (shutdown_type
== TB_SHUTDOWN_S3
)
237 if (tboot_setup_sleep())
240 tboot
->shutdown_type
= shutdown_type
;
242 switch_to_tboot_pt();
244 shutdown
= (void(*)(void))(unsigned long)tboot
->shutdown_entry
;
247 /* should not reach here */
252 static void tboot_copy_fadt(const struct acpi_table_fadt
*fadt
)
254 #define TB_COPY_GAS(tbg, g) \
255 tbg.space_id = g.space_id; \
256 tbg.bit_width = g.bit_width; \
257 tbg.bit_offset = g.bit_offset; \
258 tbg.access_width = g.access_width; \
259 tbg.address = g.address;
261 TB_COPY_GAS(tboot
->acpi_sinfo
.pm1a_cnt_blk
, fadt
->xpm1a_control_block
);
262 TB_COPY_GAS(tboot
->acpi_sinfo
.pm1b_cnt_blk
, fadt
->xpm1b_control_block
);
263 TB_COPY_GAS(tboot
->acpi_sinfo
.pm1a_evt_blk
, fadt
->xpm1a_event_block
);
264 TB_COPY_GAS(tboot
->acpi_sinfo
.pm1b_evt_blk
, fadt
->xpm1b_event_block
);
267 * We need phys addr of waking vector, but can't use virt_to_phys() on
268 * &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys
271 tboot
->acpi_sinfo
.wakeup_vector
= fadt
->facs
+
272 offsetof(struct acpi_table_facs
, firmware_waking_vector
);
275 void tboot_sleep(u8 sleep_state
, u32 pm1a_control
, u32 pm1b_control
)
277 static u32 acpi_shutdown_map
[ACPI_S_STATE_COUNT
] = {
278 /* S0,1,2: */ -1, -1, -1,
279 /* S3: */ TB_SHUTDOWN_S3
,
280 /* S4: */ TB_SHUTDOWN_S4
,
281 /* S5: */ TB_SHUTDOWN_S5
};
283 if (!tboot_enabled())
286 tboot_copy_fadt(&acpi_gbl_FADT
);
287 tboot
->acpi_sinfo
.pm1a_cnt_val
= pm1a_control
;
288 tboot
->acpi_sinfo
.pm1b_cnt_val
= pm1b_control
;
289 /* we always use the 32b wakeup vector */
290 tboot
->acpi_sinfo
.vector_width
= 32;
292 if (sleep_state
>= ACPI_S_STATE_COUNT
||
293 acpi_shutdown_map
[sleep_state
] == -1) {
294 pr_warning("unsupported sleep state 0x%x\n", sleep_state
);
298 tboot_shutdown(acpi_shutdown_map
[sleep_state
]);
301 static atomic_t ap_wfs_count
;
303 static int tboot_wait_for_aps(int num_aps
)
305 unsigned long timeout
;
307 timeout
= AP_WAIT_TIMEOUT
*HZ
;
308 while (atomic_read((atomic_t
*)&tboot
->num_in_wfs
) != num_aps
&&
315 pr_warning("tboot wait for APs timeout\n");
317 return !(atomic_read((atomic_t
*)&tboot
->num_in_wfs
) == num_aps
);
320 static int __cpuinit
tboot_cpu_callback(struct notifier_block
*nfb
,
321 unsigned long action
, void *hcpu
)
325 atomic_inc(&ap_wfs_count
);
326 if (num_online_cpus() == 1)
327 if (tboot_wait_for_aps(atomic_read(&ap_wfs_count
)))
334 static struct notifier_block tboot_cpu_notifier __cpuinitdata
=
336 .notifier_call
= tboot_cpu_callback
,
339 static __init
int tboot_late_init(void)
341 if (!tboot_enabled())
344 tboot_create_trampoline();
346 atomic_set(&ap_wfs_count
, 0);
347 register_hotcpu_notifier(&tboot_cpu_notifier
);
351 late_initcall(tboot_late_init
);
354 * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE)
357 #define TXT_PUB_CONFIG_REGS_BASE 0xfed30000
358 #define TXT_PRIV_CONFIG_REGS_BASE 0xfed20000
360 /* # pages for each config regs space - used by fixmap */
361 #define NR_TXT_CONFIG_PAGES ((TXT_PUB_CONFIG_REGS_BASE - \
362 TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT)
364 /* offsets from pub/priv config space */
365 #define TXTCR_HEAP_BASE 0x0300
366 #define TXTCR_HEAP_SIZE 0x0308
374 struct sinit_mle_data
{
375 u32 version
; /* currently 6 */
376 struct sha1_hash bios_acm_id
;
377 u32 edx_senter_flags
;
379 struct sha1_hash sinit_hash
;
380 struct sha1_hash mle_hash
;
381 struct sha1_hash stm_hash
;
382 struct sha1_hash lcp_policy_hash
;
383 u32 lcp_policy_control
;
392 struct acpi_table_header
*tboot_get_dmar_table(struct acpi_table_header
*dmar_tbl
)
394 void *heap_base
, *heap_ptr
, *config
;
396 if (!tboot_enabled())
400 * ACPI tables may not be DMA protected by tboot, so use DMAR copy
401 * SINIT saved in SinitMleData in TXT heap (which is DMA protected)
404 /* map config space in order to get heap addr */
405 config
= ioremap(TXT_PUB_CONFIG_REGS_BASE
, NR_TXT_CONFIG_PAGES
*
410 /* now map TXT heap */
411 heap_base
= ioremap(*(u64
*)(config
+ TXTCR_HEAP_BASE
),
412 *(u64
*)(config
+ TXTCR_HEAP_SIZE
));
417 /* walk heap to SinitMleData */
419 heap_ptr
= heap_base
+ *(u64
*)heap_base
;
421 heap_ptr
+= *(u64
*)heap_ptr
;
422 /* skip OsSinitData */
423 heap_ptr
+= *(u64
*)heap_ptr
;
424 /* now points to SinitMleDataSize; set to SinitMleData */
425 heap_ptr
+= sizeof(u64
);
426 /* get addr of DMAR table */
427 dmar_tbl
= (struct acpi_table_header
*)(heap_ptr
+
428 ((struct sinit_mle_data
*)heap_ptr
)->vtd_dmars_off
-
431 /* don't unmap heap because dmar.c needs access to this */
436 int tboot_force_iommu(void)
438 if (!tboot_enabled())
441 if (no_iommu
|| swiotlb
|| dmar_disabled
)
442 pr_warning("Forcing Intel-IOMMU to enabled\n");
445 #ifdef CONFIG_SWIOTLB