- 根目录:
- 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 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),
};
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, NULL, 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;
}
static void tboot_create_trampoline(void)
{
u32 map_base, map_size;
/* 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);
}
#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 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)
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;
tboot_create_trampoline();
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;
}