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>
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_any_mapped(boot_params
.tboot_addr
,
72 boot_params
.tboot_addr
, E820_RESERVED
)) {
73 pr_warning("non-0 tboot_addr but it is not of type E820_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
,
125 pgd
= pgd_offset(&tboot_mm
, vaddr
);
126 pud
= pud_alloc(&tboot_mm
, pgd
, vaddr
);
129 pmd
= pmd_alloc(&tboot_mm
, pud
, vaddr
);
132 pte
= pte_alloc_map(&tboot_mm
, pmd
, vaddr
);
135 set_pte_at(&tboot_mm
, vaddr
, pte
, pfn_pte(pfn
, prot
));
140 static int map_tboot_pages(unsigned long vaddr
, unsigned long start_pfn
,
143 /* Reuse the original kernel mapping */
144 tboot_pg_dir
= pgd_alloc(&tboot_mm
);
148 for (; nr
> 0; nr
--, vaddr
+= PAGE_SIZE
, start_pfn
++) {
149 if (map_tboot_page(vaddr
, start_pfn
, PAGE_KERNEL_EXEC
))
156 static void tboot_create_trampoline(void)
158 u32 map_base
, map_size
;
160 /* Create identity map for tboot shutdown code. */
161 map_base
= PFN_DOWN(tboot
->tboot_base
);
162 map_size
= PFN_UP(tboot
->tboot_size
);
163 if (map_tboot_pages(map_base
<< PAGE_SHIFT
, map_base
, map_size
))
164 panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n",
168 #ifdef CONFIG_ACPI_SLEEP
170 static void add_mac_region(phys_addr_t start
, unsigned long size
)
172 struct tboot_mac_region
*mr
;
173 phys_addr_t end
= start
+ size
;
175 if (tboot
->num_mac_regions
>= MAX_TB_MAC_REGIONS
)
176 panic("tboot: Too many MAC regions\n");
179 mr
= &tboot
->mac_regions
[tboot
->num_mac_regions
++];
180 mr
->start
= round_down(start
, PAGE_SIZE
);
181 mr
->size
= round_up(end
, PAGE_SIZE
) - mr
->start
;
185 static int tboot_setup_sleep(void)
189 tboot
->num_mac_regions
= 0;
191 for (i
= 0; i
< e820
.nr_map
; i
++) {
192 if ((e820
.map
[i
].type
!= E820_RAM
)
193 && (e820
.map
[i
].type
!= E820_RESERVED_KERN
))
196 add_mac_region(e820
.map
[i
].addr
, e820
.map
[i
].size
);
199 tboot
->acpi_sinfo
.kernel_s3_resume_vector
=
200 real_mode_header
->wakeup_start
;
205 #else /* no CONFIG_ACPI_SLEEP */
207 static int tboot_setup_sleep(void)
209 /* S3 shutdown requested, but S3 not supported by the kernel... */
216 void tboot_shutdown(u32 shutdown_type
)
218 void (*shutdown
)(void);
220 if (!tboot_enabled())
224 * if we're being called before the 1:1 mapping is set up then just
225 * return and let the normal shutdown happen; this should only be
226 * due to very early panic()
231 /* if this is S3 then set regions to MAC */
232 if (shutdown_type
== TB_SHUTDOWN_S3
)
233 if (tboot_setup_sleep())
236 tboot
->shutdown_type
= shutdown_type
;
238 switch_to_tboot_pt();
240 shutdown
= (void(*)(void))(unsigned long)tboot
->shutdown_entry
;
243 /* should not reach here */
248 static void tboot_copy_fadt(const struct acpi_table_fadt
*fadt
)
250 #define TB_COPY_GAS(tbg, g) \
251 tbg.space_id = g.space_id; \
252 tbg.bit_width = g.bit_width; \
253 tbg.bit_offset = g.bit_offset; \
254 tbg.access_width = g.access_width; \
255 tbg.address = g.address;
257 TB_COPY_GAS(tboot
->acpi_sinfo
.pm1a_cnt_blk
, fadt
->xpm1a_control_block
);
258 TB_COPY_GAS(tboot
->acpi_sinfo
.pm1b_cnt_blk
, fadt
->xpm1b_control_block
);
259 TB_COPY_GAS(tboot
->acpi_sinfo
.pm1a_evt_blk
, fadt
->xpm1a_event_block
);
260 TB_COPY_GAS(tboot
->acpi_sinfo
.pm1b_evt_blk
, fadt
->xpm1b_event_block
);
263 * We need phys addr of waking vector, but can't use virt_to_phys() on
264 * &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys
267 tboot
->acpi_sinfo
.wakeup_vector
= fadt
->facs
+
268 offsetof(struct acpi_table_facs
, firmware_waking_vector
);
271 static int tboot_sleep(u8 sleep_state
, u32 pm1a_control
, u32 pm1b_control
)
273 static u32 acpi_shutdown_map
[ACPI_S_STATE_COUNT
] = {
274 /* S0,1,2: */ -1, -1, -1,
275 /* S3: */ TB_SHUTDOWN_S3
,
276 /* S4: */ TB_SHUTDOWN_S4
,
277 /* S5: */ TB_SHUTDOWN_S5
};
279 if (!tboot_enabled())
282 tboot_copy_fadt(&acpi_gbl_FADT
);
283 tboot
->acpi_sinfo
.pm1a_cnt_val
= pm1a_control
;
284 tboot
->acpi_sinfo
.pm1b_cnt_val
= pm1b_control
;
285 /* we always use the 32b wakeup vector */
286 tboot
->acpi_sinfo
.vector_width
= 32;
288 if (sleep_state
>= ACPI_S_STATE_COUNT
||
289 acpi_shutdown_map
[sleep_state
] == -1) {
290 pr_warning("unsupported sleep state 0x%x\n", sleep_state
);
294 tboot_shutdown(acpi_shutdown_map
[sleep_state
]);
298 static int tboot_extended_sleep(u8 sleep_state
, u32 val_a
, u32 val_b
)
300 if (!tboot_enabled())
303 pr_warning("tboot is not able to suspend on platforms with reduced hardware sleep (ACPIv5)");
307 static atomic_t ap_wfs_count
;
309 static int tboot_wait_for_aps(int num_aps
)
311 unsigned long timeout
;
313 timeout
= AP_WAIT_TIMEOUT
*HZ
;
314 while (atomic_read((atomic_t
*)&tboot
->num_in_wfs
) != num_aps
&&
321 pr_warning("tboot wait for APs timeout\n");
323 return !(atomic_read((atomic_t
*)&tboot
->num_in_wfs
) == num_aps
);
326 static int tboot_dying_cpu(unsigned int cpu
)
328 atomic_inc(&ap_wfs_count
);
329 if (num_online_cpus() == 1) {
330 if (tboot_wait_for_aps(atomic_read(&ap_wfs_count
)))
336 #ifdef CONFIG_DEBUG_FS
338 #define TBOOT_LOG_UUID { 0x26, 0x25, 0x19, 0xc0, 0x30, 0x6b, 0xb4, 0x4d, \
339 0x4c, 0x84, 0xa3, 0xe9, 0x53, 0xb8, 0x81, 0x74 }
341 #define TBOOT_SERIAL_LOG_ADDR 0x60000
342 #define TBOOT_SERIAL_LOG_SIZE 0x08000
343 #define LOG_MAX_SIZE_OFF 16
344 #define LOG_BUF_OFF 24
346 static uint8_t tboot_log_uuid
[16] = TBOOT_LOG_UUID
;
348 static ssize_t
tboot_log_read(struct file
*file
, char __user
*user_buf
, size_t count
, loff_t
*ppos
)
350 void __iomem
*log_base
;
356 log_base
= ioremap_nocache(TBOOT_SERIAL_LOG_ADDR
, TBOOT_SERIAL_LOG_SIZE
);
360 memcpy_fromio(log_uuid
, log_base
, sizeof(log_uuid
));
361 if (memcmp(&tboot_log_uuid
, log_uuid
, sizeof(log_uuid
)))
364 max_size
= readl(log_base
+ LOG_MAX_SIZE_OFF
);
365 if (*ppos
>= max_size
) {
370 if (*ppos
+ count
> max_size
)
371 count
= max_size
- *ppos
;
373 kbuf
= kmalloc(count
, GFP_KERNEL
);
379 memcpy_fromio(kbuf
, log_base
+ LOG_BUF_OFF
+ *ppos
, count
);
380 if (copy_to_user(user_buf
, kbuf
, count
))
396 static const struct file_operations tboot_log_fops
= {
397 .read
= tboot_log_read
,
398 .llseek
= default_llseek
,
401 #endif /* CONFIG_DEBUG_FS */
403 static __init
int tboot_late_init(void)
405 if (!tboot_enabled())
408 tboot_create_trampoline();
410 atomic_set(&ap_wfs_count
, 0);
411 cpuhp_setup_state(CPUHP_AP_X86_TBOOT_DYING
, "AP_X86_TBOOT_DYING", NULL
,
413 #ifdef CONFIG_DEBUG_FS
414 debugfs_create_file("tboot_log", S_IRUSR
,
415 arch_debugfs_dir
, NULL
, &tboot_log_fops
);
418 acpi_os_set_prepare_sleep(&tboot_sleep
);
419 acpi_os_set_prepare_extended_sleep(&tboot_extended_sleep
);
423 late_initcall(tboot_late_init
);
426 * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE)
429 #define TXT_PUB_CONFIG_REGS_BASE 0xfed30000
430 #define TXT_PRIV_CONFIG_REGS_BASE 0xfed20000
432 /* # pages for each config regs space - used by fixmap */
433 #define NR_TXT_CONFIG_PAGES ((TXT_PUB_CONFIG_REGS_BASE - \
434 TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT)
436 /* offsets from pub/priv config space */
437 #define TXTCR_HEAP_BASE 0x0300
438 #define TXTCR_HEAP_SIZE 0x0308
446 struct sinit_mle_data
{
447 u32 version
; /* currently 6 */
448 struct sha1_hash bios_acm_id
;
449 u32 edx_senter_flags
;
451 struct sha1_hash sinit_hash
;
452 struct sha1_hash mle_hash
;
453 struct sha1_hash stm_hash
;
454 struct sha1_hash lcp_policy_hash
;
455 u32 lcp_policy_control
;
464 struct acpi_table_header
*tboot_get_dmar_table(struct acpi_table_header
*dmar_tbl
)
466 void *heap_base
, *heap_ptr
, *config
;
468 if (!tboot_enabled())
472 * ACPI tables may not be DMA protected by tboot, so use DMAR copy
473 * SINIT saved in SinitMleData in TXT heap (which is DMA protected)
476 /* map config space in order to get heap addr */
477 config
= ioremap(TXT_PUB_CONFIG_REGS_BASE
, NR_TXT_CONFIG_PAGES
*
482 /* now map TXT heap */
483 heap_base
= ioremap(*(u64
*)(config
+ TXTCR_HEAP_BASE
),
484 *(u64
*)(config
+ TXTCR_HEAP_SIZE
));
489 /* walk heap to SinitMleData */
491 heap_ptr
= heap_base
+ *(u64
*)heap_base
;
493 heap_ptr
+= *(u64
*)heap_ptr
;
494 /* skip OsSinitData */
495 heap_ptr
+= *(u64
*)heap_ptr
;
496 /* now points to SinitMleDataSize; set to SinitMleData */
497 heap_ptr
+= sizeof(u64
);
498 /* get addr of DMAR table */
499 dmar_tbl
= (struct acpi_table_header
*)(heap_ptr
+
500 ((struct sinit_mle_data
*)heap_ptr
)->vtd_dmars_off
-
503 /* don't unmap heap because dmar.c needs access to this */
508 int tboot_force_iommu(void)
510 if (!tboot_enabled())
513 if (no_iommu
|| swiotlb
|| dmar_disabled
)
514 pr_warning("Forcing Intel-IOMMU to enabled\n");
517 #ifdef CONFIG_SWIOTLB