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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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
*/
#include <linux/intel-iommu.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 <linux/debugfs.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/api.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__mapped_any(boot_params.tboot_addr,
boot_params.tboot_addr, E820_TYPE_RESERVED)) {
pr_warn("non-0 tboot_addr but it is not of type E820_TYPE_RESERVED\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_warn("tboot at 0x%llx is invalid\n", boot_params.tboot_addr);
tboot = NULL;
return;
}
if (tboot->version < 5) {
pr_warn("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;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
pgd = pgd_offset(&tboot_mm, vaddr);
p4d = p4d_alloc(&tboot_mm, pgd, vaddr);
if (!p4d)
return -1;
pud = pud_alloc(&tboot_mm, p4d, vaddr);
if (!pud)
return -1;
pmd = pmd_alloc(&tboot_mm, pud, vaddr);
if (!pmd)
return -1;
pte = pte_alloc_map(&tboot_mm, pmd, vaddr);
if (!pte)
return -1;
set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot));
pte_unmap(pte);
/*
* PTI poisons low addresses in the kernel page tables in the
* name of making them unusable for userspace. To execute
* code at such a low address, the poison must be cleared.
*
* Note: 'pgd' actually gets set in p4d_alloc() _or_
* pud_alloc() depending on 4/5-level paging.
*/
pgd->pgd &= ~_PAGE_NX;
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_table->nr_entries; i++) {
if ((e820_table->entries[i].type != E820_TYPE_RAM)
&& (e820_table->entries[i].type != E820_TYPE_RESERVED_KERN))
continue;
add_mac_region(e820_table->entries[i].addr, e820_table->entries[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
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