+char *physfree;
+void idt64_remap(void);
+
+/*
+ * Note: ALLOCPAGES() can only be used safely within Idle_PTs_init()
+ * due to the mutation of physfree.
+ */
+static void *
+ALLOCPAGES(int npages)
+{
+ uintptr_t tmp = (uintptr_t)physfree;
+ bzero(physfree, npages * PAGE_SIZE);
+ physfree += npages * PAGE_SIZE;
+ tmp += VM_MIN_KERNEL_ADDRESS & ~LOW_4GB_MASK;
+ return (void *)tmp;
+}
+
+static void
+fillkpt(pt_entry_t *base, int prot, uintptr_t src, int index, int count)
+{
+ int i;
+ for (i=0; i<count; i++) {
+ base[index] = src | prot | INTEL_PTE_VALID;
+ src += PAGE_SIZE;
+ index++;
+ }
+}
+
+extern pmap_paddr_t first_avail;
+
+int break_kprintf = 0;
+
+uint64_t
+x86_64_pre_sleep(void)
+{
+ IdlePML4[0] = IdlePML4[KERNEL_PML4_INDEX];
+ uint64_t oldcr3 = get_cr3_raw();
+ set_cr3_raw((uint32_t) (uintptr_t)ID_MAP_VTOP(IdlePML4));
+ return oldcr3;
+}
+
+void
+x86_64_post_sleep(uint64_t new_cr3)
+{
+ IdlePML4[0] = 0;
+ set_cr3_raw((uint32_t) new_cr3);
+}
+
+
+
+
+// Set up the physical mapping - NPHYSMAP GB of memory mapped at a high address
+// NPHYSMAP is determined by the maximum supported RAM size plus 4GB to account
+// the PCI hole (which is less 4GB but not more).
+
+/* Compile-time guard: NPHYSMAP is capped to 256GiB, accounting for
+ * randomisation
+ */
+extern int maxphymapsupported[NPHYSMAP <= (PTE_PER_PAGE/2) ? 1 : -1];
+
+static void
+physmap_init(void)
+{
+ pt_entry_t *physmapL3 = ALLOCPAGES(1);
+ struct {
+ pt_entry_t entries[PTE_PER_PAGE];
+ } * physmapL2 = ALLOCPAGES(NPHYSMAP);
+
+ uint64_t i;
+ uint8_t phys_random_L3 = early_random() & 0xFF;
+
+ /* We assume NX support. Mark all levels of the PHYSMAP NX
+ * to avoid granting executability via a single bit flip.
+ */
+#if DEVELOPMENT || DEBUG
+ uint32_t reg[4];
+ do_cpuid(0x80000000, reg);
+ if (reg[eax] >= 0x80000001) {
+ do_cpuid(0x80000001, reg);
+ assert(reg[edx] & CPUID_EXTFEATURE_XD);
+ }
+#endif /* DEVELOPMENT || DEBUG */
+
+ for(i = 0; i < NPHYSMAP; i++) {
+ physmapL3[i + phys_random_L3] =
+ ((uintptr_t)ID_MAP_VTOP(&physmapL2[i]))
+ | INTEL_PTE_VALID
+ | INTEL_PTE_NX
+ | INTEL_PTE_WRITE;
+
+ uint64_t j;
+ for(j = 0; j < PTE_PER_PAGE; j++) {
+ physmapL2[i].entries[j] =
+ ((i * PTE_PER_PAGE + j) << PDSHIFT)
+ | INTEL_PTE_PS
+ | INTEL_PTE_VALID
+ | INTEL_PTE_NX
+ | INTEL_PTE_WRITE;
+ }
+ }
+
+ IdlePML4[KERNEL_PHYSMAP_PML4_INDEX] =
+ ((uintptr_t)ID_MAP_VTOP(physmapL3))
+ | INTEL_PTE_VALID
+ | INTEL_PTE_NX
+ | INTEL_PTE_WRITE;
+
+ physmap_base = KVADDR(KERNEL_PHYSMAP_PML4_INDEX, phys_random_L3, 0, 0);
+ physmap_max = physmap_base + NPHYSMAP * GB;
+ DBG("Physical address map base: 0x%qx\n", physmap_base);
+ DBG("Physical map idlepml4[%d]: 0x%llx\n",
+ KERNEL_PHYSMAP_PML4_INDEX, IdlePML4[KERNEL_PHYSMAP_PML4_INDEX]);
+}
+
+void doublemap_init(void);
+
+static void
+Idle_PTs_init(void)
+{
+ /* Allocate the "idle" kernel page tables: */
+ KPTphys = ALLOCPAGES(NKPT); /* level 1 */
+ IdlePTD = ALLOCPAGES(NPGPTD); /* level 2 */
+ IdlePDPT = ALLOCPAGES(1); /* level 3 */
+ IdlePML4 = ALLOCPAGES(1); /* level 4 */
+
+ // Fill the lowest level with everything up to physfree
+ fillkpt(KPTphys,
+ INTEL_PTE_WRITE, 0, 0, (int)(((uintptr_t)physfree) >> PAGE_SHIFT));
+
+ /* IdlePTD */
+ fillkpt(IdlePTD,
+ INTEL_PTE_WRITE, (uintptr_t)ID_MAP_VTOP(KPTphys), 0, NKPT);
+
+ // IdlePDPT entries
+ fillkpt(IdlePDPT,
+ INTEL_PTE_WRITE, (uintptr_t)ID_MAP_VTOP(IdlePTD), 0, NPGPTD);
+
+ // IdlePML4 single entry for kernel space.
+ fillkpt(IdlePML4 + KERNEL_PML4_INDEX,
+ INTEL_PTE_WRITE, (uintptr_t)ID_MAP_VTOP(IdlePDPT), 0, 1);
+
+ postcode(VSTART_PHYSMAP_INIT);
+
+ physmap_init();
+ doublemap_init();
+ idt64_remap();
+
+ postcode(VSTART_SET_CR3);
+
+ // Switch to the page tables..
+ set_cr3_raw((uintptr_t)ID_MAP_VTOP(IdlePML4));
+
+}
+
+extern void vstart_trap_handler;
+
+#define BOOT_TRAP_VECTOR(t) \
+ [t] = { \
+ (uintptr_t) &vstart_trap_handler, \
+ KERNEL64_CS, \
+ 0, \
+ ACC_P|ACC_PL_K|ACC_INTR_GATE, \
+ 0 \
+ },
+
+/* Recursive macro to iterate 0..31 */
+#define L0(x,n) x(n)
+#define L1(x,n) L0(x,n-1) L0(x,n)
+#define L2(x,n) L1(x,n-2) L1(x,n)
+#define L3(x,n) L2(x,n-4) L2(x,n)
+#define L4(x,n) L3(x,n-8) L3(x,n)
+#define L5(x,n) L4(x,n-16) L4(x,n)
+#define FOR_0_TO_31(x) L5(x,31)
+
+/*
+ * Bootstrap IDT. Active only during early startup.
+ * Only the trap vectors are defined since interrupts are masked.
+ * All traps point to a common handler.
+ */
+struct fake_descriptor64 master_boot_idt64[IDTSZ]
+ __attribute__((section("__HIB,__desc")))
+ __attribute__((aligned(PAGE_SIZE))) = {
+ FOR_0_TO_31(BOOT_TRAP_VECTOR)
+};
+
+static void
+vstart_idt_init(void)
+{
+ x86_64_desc_register_t vstart_idt = {
+ sizeof(master_boot_idt64),
+ master_boot_idt64 };
+
+ fix_desc64(master_boot_idt64, 32);
+ lidt((void *)&vstart_idt);
+}
+
+/*
+ * vstart() is called in the natural mode (64bit for K64, 32 for K32)
+ * on a set of bootstrap pagetables which use large, 2MB pages to map
+ * all of physical memory in both. See idle_pt.c for details.
+ *
+ * In K64 this identity mapping is mirrored the top and bottom 512GB
+ * slots of PML4.
+ *
+ * The bootstrap processor called with argument boot_args_start pointing to
+ * the boot-args block. The kernel's (4K page) page tables are allocated and
+ * initialized before switching to these.
+ *
+ * Non-bootstrap processors are called with argument boot_args_start NULL.
+ * These processors switch immediately to the existing kernel page tables.
+ */
+__attribute__((noreturn))
+void
+vstart(vm_offset_t boot_args_start)
+{
+ boolean_t is_boot_cpu = !(boot_args_start == 0);
+ int cpu = 0;
+ uint32_t lphysfree;
+
+ postcode(VSTART_ENTRY);
+
+ if (is_boot_cpu) {
+ /*
+ * Set-up temporary trap handlers during page-table set-up.
+ */
+ vstart_idt_init();
+ postcode(VSTART_IDT_INIT);
+
+ /*
+ * Get startup parameters.
+ */
+ kernelBootArgs = (boot_args *)boot_args_start;
+ lphysfree = kernelBootArgs->kaddr + kernelBootArgs->ksize;
+ physfree = (void *)(uintptr_t)((lphysfree + PAGE_SIZE - 1) &~ (PAGE_SIZE - 1));
+
+#if DEVELOPMENT || DEBUG
+ pal_serial_init();
+#endif
+ DBG("revision 0x%x\n", kernelBootArgs->Revision);
+ DBG("version 0x%x\n", kernelBootArgs->Version);
+ DBG("command line %s\n", kernelBootArgs->CommandLine);
+ DBG("memory map 0x%x\n", kernelBootArgs->MemoryMap);
+ DBG("memory map sz 0x%x\n", kernelBootArgs->MemoryMapSize);
+ DBG("kaddr 0x%x\n", kernelBootArgs->kaddr);
+ DBG("ksize 0x%x\n", kernelBootArgs->ksize);
+ DBG("physfree %p\n", physfree);
+ DBG("bootargs: %p, &ksize: %p &kaddr: %p\n",
+ kernelBootArgs,
+ &kernelBootArgs->ksize,
+ &kernelBootArgs->kaddr);
+ DBG("SMBIOS mem sz 0x%llx\n", kernelBootArgs->PhysicalMemorySize);
+
+ /*
+ * Setup boot args given the physical start address.
+ * Note: PE_init_platform needs to be called before Idle_PTs_init
+ * because access to the DeviceTree is required to read the
+ * random seed before generating a random physical map slide.
+ */
+ kernelBootArgs = (boot_args *)
+ ml_static_ptovirt(boot_args_start);
+ DBG("i386_init(0x%lx) kernelBootArgs=%p\n",
+ (unsigned long)boot_args_start, kernelBootArgs);
+
+#if KASAN
+ kasan_reserve_memory(kernelBootArgs);
+#endif
+
+ PE_init_platform(FALSE, kernelBootArgs);
+ postcode(PE_INIT_PLATFORM_D);
+
+ Idle_PTs_init();
+ postcode(VSTART_IDLE_PTS_INIT);
+
+#if KASAN
+ /* Init kasan and map whatever was stolen from physfree */
+ kasan_init();
+ kasan_notify_stolen((uintptr_t)ml_static_ptovirt((vm_offset_t)physfree));
+#endif
+
+#if MONOTONIC
+ mt_early_init();
+#endif /* MONOTONIC */
+
+ first_avail = (vm_offset_t)ID_MAP_VTOP(physfree);
+
+ cpu_data_alloc(TRUE);
+
+ cpu_desc_init(cpu_datap(0));
+ postcode(VSTART_CPU_DESC_INIT);
+ cpu_desc_load(cpu_datap(0));
+
+ postcode(VSTART_CPU_MODE_INIT);
+ cpu_syscall_init(cpu_datap(0)); /* cpu_syscall_init() will be
+ * invoked on the APs
+ * via i386_init_slave()
+ */
+ } else {
+ /* Switch to kernel's page tables (from the Boot PTs) */
+ set_cr3_raw((uintptr_t)ID_MAP_VTOP(IdlePML4));
+ /* Find our logical cpu number */
+ cpu = lapic_to_cpu[(LAPIC_READ(ID)>>LAPIC_ID_SHIFT) & LAPIC_ID_MASK];
+ DBG("CPU: %d, GSBASE initial value: 0x%llx\n", cpu, rdmsr64(MSR_IA32_GS_BASE));
+ cpu_desc_load(cpu_datap(cpu));
+ }
+
+ postcode(VSTART_EXIT);
+ x86_init_wrapper(is_boot_cpu ? (uintptr_t) i386_init
+ : (uintptr_t) i386_init_slave,
+ cpu_datap(cpu)->cpu_int_stack_top);
+}
+
+void
+pstate_trace(void)
+{
+}
projects / apple / xnu.git / blobdiff