void __init tboot_probe(void)
{
tboot_shared_t *tboot_shared;
unsigned long p_tboot_shared;
uint32_t map_base, map_size;
unsigned long map_addr;
/* 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 */
map_base = PFN_DOWN(TXT_PUB_CONFIG_REGS_BASE);
map_size = PFN_UP(NR_TXT_CONFIG_PAGES * PAGE_SIZE);
map_addr = (unsigned long)__va(map_base << PAGE_SHIFT);
if ( map_pages_to_xen(map_addr, map_base, map_size, __PAGE_HYPERVISOR) )
return;
/* TXT Heap */
txt_heap_base =
*(uint64_t *)__va(TXT_PUB_CONFIG_REGS_BASE + TXTCR_HEAP_BASE);
txt_heap_size =
*(uint64_t *)__va(TXT_PUB_CONFIG_REGS_BASE + TXTCR_HEAP_SIZE);
/* SINIT */
sinit_base =
*(uint64_t *)__va(TXT_PUB_CONFIG_REGS_BASE + TXTCR_SINIT_BASE);
sinit_size =
*(uint64_t *)__va(TXT_PUB_CONFIG_REGS_BASE + TXTCR_SINIT_SIZE);
destroy_xen_mappings((unsigned long)__va(map_base << PAGE_SHIFT),
(unsigned long)__va((map_base + map_size) << PAGE_SHIFT));
}
void vunmap(const void *va)
{
#ifndef _PAGE_NONE
unsigned long addr = (unsigned long)va;
destroy_xen_mappings(addr, addr + PAGE_SIZE * vm_size(va));
#else /* Avoid tearing down intermediate page tables. */
map_pages_to_xen((unsigned long)va, 0, vm_size(va), _PAGE_NONE);
#endif
vm_free(va);
}