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>
34 #include <linux/debugfs.h>
36 #include <asm/realmode.h>
37 #include <asm/processor.h>
38 #include <asm/bootparam.h>
39 #include <asm/pgtable.h>
40 #include <asm/pgalloc.h>
41 #include <asm/swiotlb.h>
42 #include <asm/fixmap.h>
43 #include <asm/proto.h>
44 #include <asm/setup.h>
45 #include <asm/e820/api.h>
48 #include "../realmode/rm/wakeup.h"
50 /* Global pointer to shared data; NULL means no measured launch. */
51 struct tboot
*tboot __read_mostly
;
54 /* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */
55 #define AP_WAIT_TIMEOUT 1
58 #define pr_fmt(fmt) "tboot: " fmt
60 static u8 tboot_uuid
[16] __initdata
= TBOOT_UUID
;
62 void __init
tboot_probe(void)
64 /* Look for valid page-aligned address for shared page. */
65 if (!boot_params
.tboot_addr
)
68 * also verify that it is mapped as we expect it before calling
69 * set_fixmap(), to reduce chance of garbage value causing crash
71 if (!e820__mapped_any(boot_params
.tboot_addr
,
72 boot_params
.tboot_addr
, E820_TYPE_RESERVED
)) {
73 pr_warning("non-0 tboot_addr but it is not of type E820_TYPE_RESERVED\n");
77 /* Map and check for tboot UUID. */
78 set_fixmap(FIX_TBOOT_BASE
, boot_params
.tboot_addr
);
79 tboot
= (struct tboot
*)fix_to_virt(FIX_TBOOT_BASE
);
80 if (memcmp(&tboot_uuid
, &tboot
->uuid
, sizeof(tboot
->uuid
))) {
81 pr_warning("tboot at 0x%llx is invalid\n",
82 boot_params
.tboot_addr
);
86 if (tboot
->version
< 5) {
87 pr_warning("tboot version is invalid: %u\n", tboot
->version
);
92 pr_info("found shared page at phys addr 0x%llx:\n",
93 boot_params
.tboot_addr
);
94 pr_debug("version: %d\n", tboot
->version
);
95 pr_debug("log_addr: 0x%08x\n", tboot
->log_addr
);
96 pr_debug("shutdown_entry: 0x%x\n", tboot
->shutdown_entry
);
97 pr_debug("tboot_base: 0x%08x\n", tboot
->tboot_base
);
98 pr_debug("tboot_size: 0x%x\n", tboot
->tboot_size
);
101 static pgd_t
*tboot_pg_dir
;
102 static struct mm_struct tboot_mm
= {
104 .pgd
= swapper_pg_dir
,
105 .mm_users
= ATOMIC_INIT(2),
106 .mm_count
= ATOMIC_INIT(1),
107 .mmap_sem
= __RWSEM_INITIALIZER(init_mm
.mmap_sem
),
108 .page_table_lock
= __SPIN_LOCK_UNLOCKED(init_mm
.page_table_lock
),
109 .mmlist
= LIST_HEAD_INIT(init_mm
.mmlist
),
112 static inline void switch_to_tboot_pt(void)
114 write_cr3(virt_to_phys(tboot_pg_dir
));
117 static int map_tboot_page(unsigned long vaddr
, unsigned long pfn
,
126 pgd
= pgd_offset(&tboot_mm
, vaddr
);
127 p4d
= p4d_alloc(&tboot_mm
, pgd
, vaddr
);
130 pud
= pud_alloc(&tboot_mm
, p4d
, vaddr
);
133 pmd
= pmd_alloc(&tboot_mm
, pud
, vaddr
);
136 pte
= pte_alloc_map(&tboot_mm
, pmd
, vaddr
);
139 set_pte_at(&tboot_mm
, vaddr
, pte
, pfn_pte(pfn
, prot
));
144 static int map_tboot_pages(unsigned long vaddr
, unsigned long start_pfn
,
147 /* Reuse the original kernel mapping */
148 tboot_pg_dir
= pgd_alloc(&tboot_mm
);
152 for (; nr
> 0; nr
--, vaddr
+= PAGE_SIZE
, start_pfn
++) {
153 if (map_tboot_page(vaddr
, start_pfn
, PAGE_KERNEL_EXEC
))
160 static void tboot_create_trampoline(void)
162 u32 map_base
, map_size
;
164 /* Create identity map for tboot shutdown code. */
165 map_base
= PFN_DOWN(tboot
->tboot_base
);
166 map_size
= PFN_UP(tboot
->tboot_size
);
167 if (map_tboot_pages(map_base
<< PAGE_SHIFT
, map_base
, map_size
))
168 panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n",
172 #ifdef CONFIG_ACPI_SLEEP
174 static void add_mac_region(phys_addr_t start
, unsigned long size
)
176 struct tboot_mac_region
*mr
;
177 phys_addr_t end
= start
+ size
;
179 if (tboot
->num_mac_regions
>= MAX_TB_MAC_REGIONS
)
180 panic("tboot: Too many MAC regions\n");
183 mr
= &tboot
->mac_regions
[tboot
->num_mac_regions
++];
184 mr
->start
= round_down(start
, PAGE_SIZE
);
185 mr
->size
= round_up(end
, PAGE_SIZE
) - mr
->start
;
189 static int tboot_setup_sleep(void)
193 tboot
->num_mac_regions
= 0;
195 for (i
= 0; i
< e820_table
->nr_entries
; i
++) {
196 if ((e820_table
->entries
[i
].type
!= E820_TYPE_RAM
)
197 && (e820_table
->entries
[i
].type
!= E820_TYPE_RESERVED_KERN
))
200 add_mac_region(e820_table
->entries
[i
].addr
, e820_table
->entries
[i
].size
);
203 tboot
->acpi_sinfo
.kernel_s3_resume_vector
=
204 real_mode_header
->wakeup_start
;
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 static int 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
]);
302 static int tboot_extended_sleep(u8 sleep_state
, u32 val_a
, u32 val_b
)
304 if (!tboot_enabled())
307 pr_warning("tboot is not able to suspend on platforms with reduced hardware sleep (ACPIv5)");
311 static atomic_t ap_wfs_count
;
313 static int tboot_wait_for_aps(int num_aps
)
315 unsigned long timeout
;
317 timeout
= AP_WAIT_TIMEOUT
*HZ
;
318 while (atomic_read((atomic_t
*)&tboot
->num_in_wfs
) != num_aps
&&
325 pr_warning("tboot wait for APs timeout\n");
327 return !(atomic_read((atomic_t
*)&tboot
->num_in_wfs
) == num_aps
);
330 static int tboot_dying_cpu(unsigned int cpu
)
332 atomic_inc(&ap_wfs_count
);
333 if (num_online_cpus() == 1) {
334 if (tboot_wait_for_aps(atomic_read(&ap_wfs_count
)))
340 #ifdef CONFIG_DEBUG_FS
342 #define TBOOT_LOG_UUID { 0x26, 0x25, 0x19, 0xc0, 0x30, 0x6b, 0xb4, 0x4d, \
343 0x4c, 0x84, 0xa3, 0xe9, 0x53, 0xb8, 0x81, 0x74 }
345 #define TBOOT_SERIAL_LOG_ADDR 0x60000
346 #define TBOOT_SERIAL_LOG_SIZE 0x08000
347 #define LOG_MAX_SIZE_OFF 16
348 #define LOG_BUF_OFF 24
350 static uint8_t tboot_log_uuid
[16] = TBOOT_LOG_UUID
;
352 static ssize_t
tboot_log_read(struct file
*file
, char __user
*user_buf
, size_t count
, loff_t
*ppos
)
354 void __iomem
*log_base
;
360 log_base
= ioremap_nocache(TBOOT_SERIAL_LOG_ADDR
, TBOOT_SERIAL_LOG_SIZE
);
364 memcpy_fromio(log_uuid
, log_base
, sizeof(log_uuid
));
365 if (memcmp(&tboot_log_uuid
, log_uuid
, sizeof(log_uuid
)))
368 max_size
= readl(log_base
+ LOG_MAX_SIZE_OFF
);
369 if (*ppos
>= max_size
) {
374 if (*ppos
+ count
> max_size
)
375 count
= max_size
- *ppos
;
377 kbuf
= kmalloc(count
, GFP_KERNEL
);
383 memcpy_fromio(kbuf
, log_base
+ LOG_BUF_OFF
+ *ppos
, count
);
384 if (copy_to_user(user_buf
, kbuf
, count
))
400 static const struct file_operations tboot_log_fops
= {
401 .read
= tboot_log_read
,
402 .llseek
= default_llseek
,
405 #endif /* CONFIG_DEBUG_FS */
407 static __init
int tboot_late_init(void)
409 if (!tboot_enabled())
412 tboot_create_trampoline();
414 atomic_set(&ap_wfs_count
, 0);
415 cpuhp_setup_state(CPUHP_AP_X86_TBOOT_DYING
, "x86/tboot:dying", NULL
,
417 #ifdef CONFIG_DEBUG_FS
418 debugfs_create_file("tboot_log", S_IRUSR
,
419 arch_debugfs_dir
, NULL
, &tboot_log_fops
);
422 acpi_os_set_prepare_sleep(&tboot_sleep
);
423 acpi_os_set_prepare_extended_sleep(&tboot_extended_sleep
);
427 late_initcall(tboot_late_init
);
430 * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE)
433 #define TXT_PUB_CONFIG_REGS_BASE 0xfed30000
434 #define TXT_PRIV_CONFIG_REGS_BASE 0xfed20000
436 /* # pages for each config regs space - used by fixmap */
437 #define NR_TXT_CONFIG_PAGES ((TXT_PUB_CONFIG_REGS_BASE - \
438 TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT)
440 /* offsets from pub/priv config space */
441 #define TXTCR_HEAP_BASE 0x0300
442 #define TXTCR_HEAP_SIZE 0x0308
450 struct sinit_mle_data
{
451 u32 version
; /* currently 6 */
452 struct sha1_hash bios_acm_id
;
453 u32 edx_senter_flags
;
455 struct sha1_hash sinit_hash
;
456 struct sha1_hash mle_hash
;
457 struct sha1_hash stm_hash
;
458 struct sha1_hash lcp_policy_hash
;
459 u32 lcp_policy_control
;
468 struct acpi_table_header
*tboot_get_dmar_table(struct acpi_table_header
*dmar_tbl
)
470 void *heap_base
, *heap_ptr
, *config
;
472 if (!tboot_enabled())
476 * ACPI tables may not be DMA protected by tboot, so use DMAR copy
477 * SINIT saved in SinitMleData in TXT heap (which is DMA protected)
480 /* map config space in order to get heap addr */
481 config
= ioremap(TXT_PUB_CONFIG_REGS_BASE
, NR_TXT_CONFIG_PAGES
*
486 /* now map TXT heap */
487 heap_base
= ioremap(*(u64
*)(config
+ TXTCR_HEAP_BASE
),
488 *(u64
*)(config
+ TXTCR_HEAP_SIZE
));
493 /* walk heap to SinitMleData */
495 heap_ptr
= heap_base
+ *(u64
*)heap_base
;
497 heap_ptr
+= *(u64
*)heap_ptr
;
498 /* skip OsSinitData */
499 heap_ptr
+= *(u64
*)heap_ptr
;
500 /* now points to SinitMleDataSize; set to SinitMleData */
501 heap_ptr
+= sizeof(u64
);
502 /* get addr of DMAR table */
503 dmar_tbl
= (struct acpi_table_header
*)(heap_ptr
+
504 ((struct sinit_mle_data
*)heap_ptr
)->vtd_dmars_off
-
507 /* don't unmap heap because dmar.c needs access to this */
512 int tboot_force_iommu(void)
514 if (!tboot_enabled())
517 if (intel_iommu_tboot_noforce
)
520 if (no_iommu
|| swiotlb
|| dmar_disabled
)
521 pr_warning("Forcing Intel-IOMMU to enabled\n");
524 #ifdef CONFIG_SWIOTLB