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@@ -0,0 +1,447 @@
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+/*
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+ * tboot.c: main implementation of helper functions used by kernel for
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+ * runtime support of Intel(R) Trusted Execution Technology
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+ *
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+ * Copyright (c) 2006-2009, Intel Corporation
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms and conditions of the GNU General Public License,
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+ * version 2, as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope it will be useful, but WITHOUT
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+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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+ * more details.
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+ *
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+ * You should have received a copy of the GNU General Public License along with
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+ * this program; if not, write to the Free Software Foundation, Inc.,
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+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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+ *
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+ */
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+
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+#include <linux/dma_remapping.h>
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+#include <linux/init_task.h>
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+#include <linux/spinlock.h>
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+#include <linux/delay.h>
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+#include <linux/sched.h>
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+#include <linux/init.h>
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+#include <linux/dmar.h>
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+#include <linux/cpu.h>
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+#include <linux/pfn.h>
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+#include <linux/mm.h>
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+#include <linux/tboot.h>
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+
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+#include <asm/trampoline.h>
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+#include <asm/processor.h>
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+#include <asm/bootparam.h>
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+#include <asm/pgtable.h>
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+#include <asm/pgalloc.h>
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+#include <asm/fixmap.h>
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+#include <asm/proto.h>
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+#include <asm/setup.h>
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+#include <asm/e820.h>
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+#include <asm/io.h>
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+
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+#include "acpi/realmode/wakeup.h"
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+
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+/* Global pointer to shared data; NULL means no measured launch. */
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+struct tboot *tboot __read_mostly;
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+
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+/* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */
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+#define AP_WAIT_TIMEOUT 1
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+
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+#undef pr_fmt
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+#define pr_fmt(fmt) "tboot: " fmt
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+
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+static u8 tboot_uuid[16] __initdata = TBOOT_UUID;
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+
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+void __init tboot_probe(void)
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+{
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+ /* Look for valid page-aligned address for shared page. */
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+ if (!boot_params.tboot_addr)
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+ return;
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+ /*
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+ * also verify that it is mapped as we expect it before calling
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+ * set_fixmap(), to reduce chance of garbage value causing crash
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+ */
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+ if (!e820_any_mapped(boot_params.tboot_addr,
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+ boot_params.tboot_addr, E820_RESERVED)) {
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+ pr_warning("non-0 tboot_addr but it is not of type E820_RESERVED\n");
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+ return;
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+ }
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+
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+ /* only a natively booted kernel should be using TXT */
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+ if (paravirt_enabled()) {
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+ pr_warning("non-0 tboot_addr but pv_ops is enabled\n");
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+ return;
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+ }
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+
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+ /* Map and check for tboot UUID. */
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+ set_fixmap(FIX_TBOOT_BASE, boot_params.tboot_addr);
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+ tboot = (struct tboot *)fix_to_virt(FIX_TBOOT_BASE);
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+ if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) {
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+ pr_warning("tboot at 0x%llx is invalid\n",
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+ boot_params.tboot_addr);
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+ tboot = NULL;
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+ return;
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+ }
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+ if (tboot->version < 5) {
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+ pr_warning("tboot version is invalid: %u\n", tboot->version);
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+ tboot = NULL;
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+ return;
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+ }
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+
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+ pr_info("found shared page at phys addr 0x%llx:\n",
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+ boot_params.tboot_addr);
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+ pr_debug("version: %d\n", tboot->version);
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+ pr_debug("log_addr: 0x%08x\n", tboot->log_addr);
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+ pr_debug("shutdown_entry: 0x%x\n", tboot->shutdown_entry);
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+ pr_debug("tboot_base: 0x%08x\n", tboot->tboot_base);
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+ pr_debug("tboot_size: 0x%x\n", tboot->tboot_size);
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+}
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+
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+static pgd_t *tboot_pg_dir;
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+static struct mm_struct tboot_mm = {
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+ .mm_rb = RB_ROOT,
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+ .pgd = swapper_pg_dir,
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+ .mm_users = ATOMIC_INIT(2),
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+ .mm_count = ATOMIC_INIT(1),
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+ .mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem),
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+ .page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
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+ .mmlist = LIST_HEAD_INIT(init_mm.mmlist),
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+ .cpu_vm_mask = CPU_MASK_ALL,
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+};
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+
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+static inline void switch_to_tboot_pt(void)
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+{
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+ write_cr3(virt_to_phys(tboot_pg_dir));
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+}
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+
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+static int map_tboot_page(unsigned long vaddr, unsigned long pfn,
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+ pgprot_t prot)
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+{
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+ pgd_t *pgd;
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+ pud_t *pud;
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+ pmd_t *pmd;
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+ pte_t *pte;
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+
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+ pgd = pgd_offset(&tboot_mm, vaddr);
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+ pud = pud_alloc(&tboot_mm, pgd, vaddr);
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+ if (!pud)
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+ return -1;
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+ pmd = pmd_alloc(&tboot_mm, pud, vaddr);
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+ if (!pmd)
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+ return -1;
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+ pte = pte_alloc_map(&tboot_mm, pmd, vaddr);
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+ if (!pte)
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+ return -1;
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+ set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot));
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+ pte_unmap(pte);
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+ return 0;
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+}
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+
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+static int map_tboot_pages(unsigned long vaddr, unsigned long start_pfn,
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+ unsigned long nr)
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+{
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+ /* Reuse the original kernel mapping */
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+ tboot_pg_dir = pgd_alloc(&tboot_mm);
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+ if (!tboot_pg_dir)
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+ return -1;
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+
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+ for (; nr > 0; nr--, vaddr += PAGE_SIZE, start_pfn++) {
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+ if (map_tboot_page(vaddr, start_pfn, PAGE_KERNEL_EXEC))
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+ return -1;
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+ }
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+
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+ return 0;
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+}
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+
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+static void tboot_create_trampoline(void)
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+{
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+ u32 map_base, map_size;
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+
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+ /* Create identity map for tboot shutdown code. */
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+ map_base = PFN_DOWN(tboot->tboot_base);
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+ map_size = PFN_UP(tboot->tboot_size);
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+ if (map_tboot_pages(map_base << PAGE_SHIFT, map_base, map_size))
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+ panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n",
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+ map_base, map_size);
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+}
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+
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+#ifdef CONFIG_ACPI_SLEEP
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+
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+static void add_mac_region(phys_addr_t start, unsigned long size)
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+{
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+ struct tboot_mac_region *mr;
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+ phys_addr_t end = start + size;
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+
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+ if (start && size) {
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+ mr = &tboot->mac_regions[tboot->num_mac_regions++];
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+ mr->start = round_down(start, PAGE_SIZE);
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+ mr->size = round_up(end, PAGE_SIZE) - mr->start;
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+ }
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+}
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+
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+static int tboot_setup_sleep(void)
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+{
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+ tboot->num_mac_regions = 0;
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+
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+ /* S3 resume code */
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+ add_mac_region(acpi_wakeup_address, WAKEUP_SIZE);
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+
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+#ifdef CONFIG_X86_TRAMPOLINE
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+ /* AP trampoline code */
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+ add_mac_region(virt_to_phys(trampoline_base), TRAMPOLINE_SIZE);
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+#endif
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+
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+ /* kernel code + data + bss */
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+ add_mac_region(virt_to_phys(_text), _end - _text);
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+
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+ tboot->acpi_sinfo.kernel_s3_resume_vector = acpi_wakeup_address;
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+
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+ return 0;
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+}
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+
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+#else /* no CONFIG_ACPI_SLEEP */
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+
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+static int tboot_setup_sleep(void)
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+{
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+ /* S3 shutdown requested, but S3 not supported by the kernel... */
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+ BUG();
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+ return -1;
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+}
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+
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+#endif
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+
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+void tboot_shutdown(u32 shutdown_type)
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+{
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+ void (*shutdown)(void);
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+
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+ if (!tboot_enabled())
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+ return;
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+
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+ /*
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+ * if we're being called before the 1:1 mapping is set up then just
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+ * return and let the normal shutdown happen; this should only be
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+ * due to very early panic()
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+ */
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+ if (!tboot_pg_dir)
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+ return;
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+
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+ /* if this is S3 then set regions to MAC */
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+ if (shutdown_type == TB_SHUTDOWN_S3)
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+ if (tboot_setup_sleep())
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+ return;
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+
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+ tboot->shutdown_type = shutdown_type;
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+
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+ switch_to_tboot_pt();
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+
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+ shutdown = (void(*)(void))(unsigned long)tboot->shutdown_entry;
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+ shutdown();
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+
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+ /* should not reach here */
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+ while (1)
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+ halt();
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+}
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+
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+static void tboot_copy_fadt(const struct acpi_table_fadt *fadt)
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+{
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+#define TB_COPY_GAS(tbg, g) \
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+ tbg.space_id = g.space_id; \
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+ tbg.bit_width = g.bit_width; \
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+ tbg.bit_offset = g.bit_offset; \
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+ tbg.access_width = g.access_width; \
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+ tbg.address = g.address;
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+
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+ TB_COPY_GAS(tboot->acpi_sinfo.pm1a_cnt_blk, fadt->xpm1a_control_block);
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+ TB_COPY_GAS(tboot->acpi_sinfo.pm1b_cnt_blk, fadt->xpm1b_control_block);
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+ TB_COPY_GAS(tboot->acpi_sinfo.pm1a_evt_blk, fadt->xpm1a_event_block);
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+ TB_COPY_GAS(tboot->acpi_sinfo.pm1b_evt_blk, fadt->xpm1b_event_block);
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+
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+ /*
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+ * We need phys addr of waking vector, but can't use virt_to_phys() on
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+ * &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys
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+ * addr.
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+ */
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+ tboot->acpi_sinfo.wakeup_vector = fadt->facs +
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+ offsetof(struct acpi_table_facs, firmware_waking_vector);
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+}
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+
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+void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
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+{
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+ static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = {
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+ /* S0,1,2: */ -1, -1, -1,
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+ /* S3: */ TB_SHUTDOWN_S3,
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+ /* S4: */ TB_SHUTDOWN_S4,
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+ /* S5: */ TB_SHUTDOWN_S5 };
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+
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+ if (!tboot_enabled())
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+ return;
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+
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+ tboot_copy_fadt(&acpi_gbl_FADT);
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+ tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control;
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+ tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control;
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+ /* we always use the 32b wakeup vector */
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+ tboot->acpi_sinfo.vector_width = 32;
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+
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+ if (sleep_state >= ACPI_S_STATE_COUNT ||
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+ acpi_shutdown_map[sleep_state] == -1) {
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+ pr_warning("unsupported sleep state 0x%x\n", sleep_state);
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+ return;
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+ }
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+
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+ tboot_shutdown(acpi_shutdown_map[sleep_state]);
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+}
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+
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+static atomic_t ap_wfs_count;
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+
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+static int tboot_wait_for_aps(int num_aps)
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+{
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+ unsigned long timeout;
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+
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+ timeout = AP_WAIT_TIMEOUT*HZ;
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+ while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps &&
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+ timeout) {
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+ mdelay(1);
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+ timeout--;
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+ }
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+
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+ if (timeout)
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+ pr_warning("tboot wait for APs timeout\n");
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+
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+ return !(atomic_read((atomic_t *)&tboot->num_in_wfs) == num_aps);
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+}
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+
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+static int __cpuinit tboot_cpu_callback(struct notifier_block *nfb,
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+ unsigned long action, void *hcpu)
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+{
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+ switch (action) {
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+ case CPU_DYING:
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+ atomic_inc(&ap_wfs_count);
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+ if (num_online_cpus() == 1)
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+ if (tboot_wait_for_aps(atomic_read(&ap_wfs_count)))
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+ return NOTIFY_BAD;
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+ break;
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+ }
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+ return NOTIFY_OK;
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+}
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+
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+static struct notifier_block tboot_cpu_notifier __cpuinitdata =
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+{
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+ .notifier_call = tboot_cpu_callback,
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+};
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+
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+static __init int tboot_late_init(void)
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+{
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+ if (!tboot_enabled())
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+ return 0;
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+
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+ tboot_create_trampoline();
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+
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+ atomic_set(&ap_wfs_count, 0);
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+ register_hotcpu_notifier(&tboot_cpu_notifier);
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+ return 0;
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+}
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+
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+late_initcall(tboot_late_init);
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+
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+/*
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+ * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE)
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+ */
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+
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+#define TXT_PUB_CONFIG_REGS_BASE 0xfed30000
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+#define TXT_PRIV_CONFIG_REGS_BASE 0xfed20000
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+
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+/* # pages for each config regs space - used by fixmap */
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+#define NR_TXT_CONFIG_PAGES ((TXT_PUB_CONFIG_REGS_BASE - \
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+ TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT)
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+
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+/* offsets from pub/priv config space */
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+#define TXTCR_HEAP_BASE 0x0300
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+#define TXTCR_HEAP_SIZE 0x0308
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+
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+#define SHA1_SIZE 20
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+
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+struct sha1_hash {
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+ u8 hash[SHA1_SIZE];
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+};
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+
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+struct sinit_mle_data {
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+ u32 version; /* currently 6 */
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+ struct sha1_hash bios_acm_id;
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+ u32 edx_senter_flags;
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+ u64 mseg_valid;
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+ struct sha1_hash sinit_hash;
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+ struct sha1_hash mle_hash;
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+ struct sha1_hash stm_hash;
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+ struct sha1_hash lcp_policy_hash;
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+ u32 lcp_policy_control;
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+ u32 rlp_wakeup_addr;
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+ u32 reserved;
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+ u32 num_mdrs;
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+ u32 mdrs_off;
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+ u32 num_vtd_dmars;
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+ u32 vtd_dmars_off;
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+} __packed;
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+
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+struct acpi_table_header *tboot_get_dmar_table(struct acpi_table_header *dmar_tbl)
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+{
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+ void *heap_base, *heap_ptr, *config;
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+
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+ if (!tboot_enabled())
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+ return dmar_tbl;
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+
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|
|
+ /*
|
|
|
+ * 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;
|
|
|
+}
|
Linus Torvalds