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#include <xen/config.h>
#include <xen/init.h>
#include <xen/types.h>
#include <xen/lib.h>
#include <xen/sched.h>
#include <xen/domain_page.h>
#include <xen/iommu.h>
#include <xen/acpi.h>
#include <xen/pfn.h>
#include <asm/fixmap.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <asm/e820.h>
#include <asm/tboot.h>
#include <crypto/vmac.h>

/* tboot=<physical address of shared page> */
static char __initdata opt_tboot[20] = "";
string_param("tboot", opt_tboot);

/* Global pointer to shared data; NULL means no measured launch. */
tboot_shared_t *g_tboot_shared;

static vmac_t domain_mac;     /* MAC for all domains during S3 */
static vmac_t xenheap_mac;    /* MAC for xen heap during S3 */
static vmac_t frametable_mac; /* MAC for frame table during S3 */

static const uuid_t tboot_shared_uuid = TBOOT_SHARED_UUID;

/* used by tboot_protect_mem_regions() and/or tboot_parse_dmar_table() */
static uint64_t __initdata txt_heap_base, __initdata txt_heap_size;
static uint64_t __initdata sinit_base, __initdata sinit_size;

/*
 * 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_SINIT_BASE            0x0270
#define TXTCR_SINIT_SIZE            0x0278
#define TXTCR_HEAP_BASE             0x0300
#define TXTCR_HEAP_SIZE             0x0308

extern char __init_begin[], __bss_start[];

#define SHA1_SIZE      20
typedef uint8_t   sha1_hash_t[SHA1_SIZE];

typedef struct __packed {
    uint32_t     version;             /* currently 6 */
    sha1_hash_t  bios_acm_id;
    uint32_t     edx_senter_flags;
    uint64_t     mseg_valid;
    sha1_hash_t  sinit_hash;
    sha1_hash_t  mle_hash;
    sha1_hash_t  stm_hash;
    sha1_hash_t  lcp_policy_hash;
    uint32_t     lcp_policy_control;
    uint32_t     rlp_wakeup_addr;
    uint32_t     reserved;
    uint32_t     num_mdrs;
    uint32_t     mdrs_off;
    uint32_t     num_vtd_dmars;
    uint32_t     vtd_dmars_off;
} sinit_mle_data_t;

static void __init tboot_copy_memory(unsigned char *va, uint32_t size,
                                     unsigned long pa)
{
    unsigned long map_base = 0;
    unsigned char *map_addr = NULL;
    unsigned int i;

    for ( i = 0; i < size; i++ )
    {
        if ( map_base != PFN_DOWN(pa + i) )
        {
            map_base = PFN_DOWN(pa + i);
            set_fixmap(FIX_TBOOT_MAP_ADDRESS, map_base << PAGE_SHIFT);
            map_addr = (unsigned char *)fix_to_virt(FIX_TBOOT_MAP_ADDRESS);
        }
        va[i] = map_addr[pa + i - (map_base << PAGE_SHIFT)];
    }
}

void __init tboot_probe(void)
{
    tboot_shared_t *tboot_shared;
    unsigned long p_tboot_shared;

    /* Look for valid page-aligned address for shared page. */
    p_tboot_shared = simple_strtoul(opt_tboot, NULL, 0);
    if ( (p_tboot_shared == 0) || ((p_tboot_shared & ~PAGE_MASK) != 0) )
        return;

    /* Map and check for tboot UUID. */
    set_fixmap(FIX_TBOOT_SHARED_BASE, p_tboot_shared);
    tboot_shared = (tboot_shared_t *)fix_to_virt(FIX_TBOOT_SHARED_BASE);
    if ( tboot_shared == NULL )
        return;
    if ( memcmp(&tboot_shared_uuid, (uuid_t *)tboot_shared, sizeof(uuid_t)) )
        return;

    /* new tboot_shared (w/ GAS support, integrity, etc.) is not backwards
       compatible */
    if ( tboot_shared->version < 4 ) {
        printk("unsupported version of tboot (%u)\n", tboot_shared->version);
        return;
    }

    g_tboot_shared = tboot_shared;
    printk("TBOOT: found shared page at phys addr %lx:\n", p_tboot_shared);
    printk("  version: %d\n", tboot_shared->version);
    printk("  log_addr: 0x%08x\n", tboot_shared->log_addr);
    printk("  shutdown_entry: 0x%08x\n", tboot_shared->shutdown_entry);
    printk("  tboot_base: 0x%08x\n", tboot_shared->tboot_base);
    printk("  tboot_size: 0x%x\n", tboot_shared->tboot_size);

    /* these will be needed by tboot_protect_mem_regions() and/or
       tboot_parse_dmar_table(), so get them now */

    txt_heap_base = txt_heap_size = sinit_base = sinit_size = 0;
    /* TXT Heap */
    tboot_copy_memory((unsigned char *)&txt_heap_base, sizeof(txt_heap_base),
                      TXT_PUB_CONFIG_REGS_BASE + TXTCR_HEAP_BASE);
    tboot_copy_memory((unsigned char *)&txt_heap_size, sizeof(txt_heap_size),
                      TXT_PUB_CONFIG_REGS_BASE + TXTCR_HEAP_SIZE);
    /* SINIT */
    tboot_copy_memory((unsigned char *)&sinit_base, sizeof(sinit_base),
                      TXT_PUB_CONFIG_REGS_BASE + TXTCR_SINIT_BASE);
    tboot_copy_memory((unsigned char *)&sinit_size, sizeof(sinit_size),
                      TXT_PUB_CONFIG_REGS_BASE + TXTCR_SINIT_SIZE);
}

/* definitions from xen/drivers/passthrough/vtd/iommu.h
 * used to walk through vtd page tables */
#define LEVEL_STRIDE (9)
#define PTE_NUM (1<<LEVEL_STRIDE)
#define dma_pte_present(p) (((p).val & 3) != 0)
#define dma_pte_addr(p) ((p).val & PAGE_MASK_4K)
#define agaw_to_level(val) ((val)+2)
struct dma_pte {
    u64 val;
};

static void update_iommu_mac(vmac_ctx_t *ctx, uint64_t pt_maddr, int level)
{
    int i;
    struct dma_pte *pt_vaddr, *pte;
    int next_level = level - 1;

    if ( pt_maddr == 0 )
        return;

    pt_vaddr = (struct dma_pte *)map_domain_page(pt_maddr >> PAGE_SHIFT_4K);
    vmac_update((void *)pt_vaddr, PAGE_SIZE, ctx);

    for ( i = 0; i < PTE_NUM; i++ )
    {
        pte = &pt_vaddr[i];
        if ( !dma_pte_present(*pte) )
            continue;

        if ( next_level >= 1 )
            update_iommu_mac(ctx, dma_pte_addr(*pte), next_level);
    }

    unmap_domain_page(pt_vaddr);
}

#define is_page_in_use(page) \
    (page_state_is(page, inuse) || page_state_is(page, offlining))

static void update_pagetable_mac(vmac_ctx_t *ctx)
{
    unsigned long mfn;

    for ( mfn = 0; mfn < max_page; mfn++ )
    {
        struct page_info *page = mfn_to_page(mfn);

        if ( !mfn_valid(mfn) )
            continue;
        if ( is_page_in_use(page) && !is_xen_heap_page(page) ) {
            if ( page->count_info & PGC_page_table ) {
                void *pg = map_domain_page(mfn);
                vmac_update(pg, PAGE_SIZE, ctx);
                unmap_domain_page(pg);
            }
        }
    }
}
 
static void tboot_gen_domain_integrity(const uint8_t key[TB_KEY_SIZE],
                                       vmac_t *mac)
{
    struct domain *d;
    struct page_info *page;
    uint8_t nonce[16] = {};
    vmac_ctx_t ctx;

    vmac_set_key((uint8_t *)key, &ctx);
    for_each_domain( d )
    {
        if ( !d->arch.s3_integrity )
            continue;
        printk("MACing Domain %u\n", d->domain_id);

        spin_lock(&d->page_alloc_lock);
        page_list_for_each(page, &d->page_list)
        {
            void *pg = __map_domain_page(page);
            vmac_update(pg, PAGE_SIZE, &ctx);