X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/8f6c56a50524aa785f7e596d52dddfb331e18961..d9a64523371fa019c4575bb400cbbc3a50ac9903:/osfmk/i386/i386_init.c diff --git a/osfmk/i386/i386_init.c b/osfmk/i386/i386_init.c index 07560b1e9..8eb6b7edf 100644 --- a/osfmk/i386/i386_init.c +++ b/osfmk/i386/i386_init.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2003 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2003-2016 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * @@ -54,9 +54,6 @@ * the rights to redistribute these changes. */ -#include -#include -#include #include @@ -71,147 +68,707 @@ #include #include #include +#include #include #include #include +#include +#include #include #include #include +#include #include #include -#include -#include #include +#include #include +#include #include +#include +#if CONFIG_MTRR +#include +#endif #include +#if CONFIG_MCA +#include +#endif +#include #include -#if MACH_KDB -#include -#endif /* MACH_KDB */ -#include -#ifdef __MACHO__ -#include - -static KernelBootArgs_t *kernelBootArgs; +#include +#include +#include +#include /* LcksOpts */ +#if DEBUG +#include +#endif + +#if MONOTONIC +#include +#endif /* MONOTONIC */ + +#include + +#if DEBUG +#define DBG(x...) kprintf(x) +#else +#define DBG(x...) #endif -vm_offset_t boot_args_start = 0; /* pointer to kernel arguments, set in start.s */ +int debug_task; -#ifdef __MACHO__ -#include -vm_offset_t edata, etext, end; +static boot_args *kernelBootArgs; -/* operations only against currently loaded 32 bit mach kernel */ -extern struct segment_command *getsegbyname(const char *); -extern struct section *firstsect(struct segment_command *); -extern struct section *nextsect(struct segment_command *, struct section *); +extern int disableConsoleOutput; +extern const char version[]; +extern const char version_variant[]; +extern int nx_enabled; /* - * Called first for a mach-o kernel before paging is set up. - * Returns the first available physical address in memory. + * Set initial values so that ml_phys_* routines can use the booter's ID mapping + * to touch physical space before the kernel's physical aperture exists. */ +uint64_t physmap_base = 0; +uint64_t physmap_max = 4*GB; -void -i386_preinit(void) +pd_entry_t *KPTphys; +pd_entry_t *IdlePTD; +pdpt_entry_t *IdlePDPT; +pml4_entry_t *IdlePML4; + +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) { - struct segment_command *sgp; - struct section *sp; - struct KernelBootArgs *pp; int i; + for (i=0; iflags & S_ZEROFILL)) - bzero((char *) sp->addr, sp->size); - } while ((sp = nextsect(sgp, sp))); - } +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 */ - kernelBootArgs = (KernelBootArgs_t *) - ml_static_ptovirt(boot_args_start); - pp = (struct KernelBootArgs *) kernelBootArgs; - pp->configEnd = (char *) - ml_static_ptovirt((vm_offset_t) pp->configEnd); - for (i = 0; i < pp->numBootDrivers; i++) { - pp->driverConfig[i].address = (unsigned) - ml_static_ptovirt(pp->driverConfig[i].address); + 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; + } } - return; + + 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 -extern const char version[]; -extern const char version_variant[]; + 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) +{ +} /* * Cpu initialization. Running virtual, but without MACH VM - * set up. First C routine called, unless i386_preinit() was called first. + * set up. */ void i386_init(void) { unsigned int maxmem; - unsigned int cpus; + uint64_t maxmemtouse; + unsigned int cpus = 0; + boolean_t fidn; + boolean_t IA32e = TRUE; postcode(I386_INIT_ENTRY); - master_cpu = 0; - cpu_data_alloc(TRUE); - cpu_init(); - postcode(CPU_INIT_D); + pal_i386_init(); + tsc_init(); + rtclock_early_init(); /* mach_absolute_time() now functionsl */ - /* - * Setup some processor related structures to satisfy funnels. - * Must be done before using unparallelized device drivers. - */ - processor_bootstrap(); + kernel_debug_string_early("i386_init"); + pstate_trace(); - PE_init_platform(FALSE, kernelBootArgs); - postcode(PE_INIT_PLATFORM_D); +#if CONFIG_MCA + /* Initialize machine-check handling */ + mca_cpu_init(); +#endif - /* - * Set up initial thread so current_thread() works early on - */ - thread_bootstrap(); - postcode(THREAD_BOOTSTRAP_D); + master_cpu = 0; + cpu_init(); + + postcode(CPU_INIT_D); printf_init(); /* Init this in case we need debugger */ panic_init(); /* Init this in case we need debugger */ /* setup debugging output if one has been chosen */ + kernel_debug_string_early("PE_init_kprintf"); PE_init_kprintf(FALSE); + kernel_debug_string_early("kernel_early_bootstrap"); + kernel_early_bootstrap(); + + if (!PE_parse_boot_argn("diag", &dgWork.dgFlags, sizeof (dgWork.dgFlags))) + dgWork.dgFlags = 0; + + serialmode = 0; + if (PE_parse_boot_argn("serial", &serialmode, sizeof(serialmode))) { + /* We want a serial keyboard and/or console */ + kprintf("Serial mode specified: %08X\n", serialmode); + int force_sync = serialmode & SERIALMODE_SYNCDRAIN; + if (force_sync || PE_parse_boot_argn("drain_uart_sync", &force_sync, sizeof(force_sync))) { + if (force_sync) { + serialmode |= SERIALMODE_SYNCDRAIN; + kprintf( + "WARNING: Forcing uart driver to output synchronously." + "printf()s/IOLogs will impact kernel performance.\n" + "You are advised to avoid using 'drain_uart_sync' boot-arg.\n"); + } + } + } + if (serialmode & SERIALMODE_OUTPUT) { + (void)switch_to_serial_console(); + disableConsoleOutput = FALSE; /* Allow printfs to happen */ + } + /* setup console output */ + kernel_debug_string_early("PE_init_printf"); PE_init_printf(FALSE); kprintf("version_variant = %s\n", version_variant); kprintf("version = %s\n", version); - - /* - * VM initialization, after this we're using page tables... - * The maximum number of cpus must be set beforehand. - */ - if (!PE_parse_boot_arg("maxmem", &maxmem)) - maxmem=0; + + if (!PE_parse_boot_argn("maxmem", &maxmem, sizeof (maxmem))) + maxmemtouse = 0; else - maxmem = maxmem * (1024 * 1024); + maxmemtouse = ((uint64_t)maxmem) * MB; - if (PE_parse_boot_arg("cpus", &cpus)) { + if (PE_parse_boot_argn("cpus", &cpus, sizeof (cpus))) { if ((0 < cpus) && (cpus < max_ncpus)) max_ncpus = cpus; } - i386_vm_init(maxmem, kernelBootArgs); + /* + * debug support for > 4G systems + */ + PE_parse_boot_argn("himemory_mode", &vm_himemory_mode, sizeof (vm_himemory_mode)); + if (vm_himemory_mode != 0) + kprintf("himemory_mode: %d\n", vm_himemory_mode); + + if (!PE_parse_boot_argn("immediate_NMI", &fidn, sizeof (fidn))) + force_immediate_debugger_NMI = FALSE; + else + force_immediate_debugger_NMI = fidn; + +#if DEBUG + nanoseconds_to_absolutetime(URGENCY_NOTIFICATION_ASSERT_NS, &urgency_notification_assert_abstime_threshold); +#endif + PE_parse_boot_argn("urgency_notification_abstime", + &urgency_notification_assert_abstime_threshold, + sizeof(urgency_notification_assert_abstime_threshold)); - PE_init_platform(TRUE, kernelBootArgs); + if (!(cpuid_extfeatures() & CPUID_EXTFEATURE_XD)) + nx_enabled = 0; + + /* + * VM initialization, after this we're using page tables... + * Thn maximum number of cpus must be set beforehand. + */ + kernel_debug_string_early("i386_vm_init"); + i386_vm_init(maxmemtouse, IA32e, kernelBootArgs); /* create the console for verbose or pretty mode */ + /* Note: doing this prior to tsc_init() allows for graceful panic! */ + PE_init_platform(TRUE, kernelBootArgs); PE_create_console(); + kernel_debug_string_early("power_management_init"); + power_management_init(); + processor_bootstrap(); + thread_bootstrap(); + + pstate_trace(); + kernel_debug_string_early("machine_startup"); machine_startup(); + pstate_trace(); +} + +static void +do_init_slave(boolean_t fast_restart) +{ + void *init_param = FULL_SLAVE_INIT; + + postcode(I386_INIT_SLAVE); + + if (!fast_restart) { + /* Ensure that caching and write-through are enabled */ + set_cr0(get_cr0() & ~(CR0_NW|CR0_CD)); + + DBG("i386_init_slave() CPU%d: phys (%d) active.\n", + get_cpu_number(), get_cpu_phys_number()); + + assert(!ml_get_interrupts_enabled()); + + cpu_syscall_init(current_cpu_datap()); + pmap_cpu_init(); + +#if CONFIG_MCA + mca_cpu_init(); +#endif + + LAPIC_INIT(); + lapic_configure(); + LAPIC_DUMP(); + LAPIC_CPU_MAP_DUMP(); + + init_fpu(); + +#if CONFIG_MTRR + mtrr_update_cpu(); +#endif + /* update CPU microcode */ + ucode_update_wake(); + } else + init_param = FAST_SLAVE_INIT; + +#if CONFIG_VMX + /* resume VT operation */ + vmx_resume(FALSE); +#endif +#if CONFIG_MTRR + if (!fast_restart) + pat_init(); +#endif + + cpu_thread_init(); /* not strictly necessary */ + + cpu_init(); /* Sets cpu_running which starter cpu waits for */ + slave_main(init_param); + + panic("do_init_slave() returned from slave_main()"); +} + +/* + * i386_init_slave() is called from pstart. + * We're in the cpu's interrupt stack with interrupts disabled. + * At this point we are in legacy mode. We need to switch on IA32e + * if the mode is set to 64-bits. + */ +void +i386_init_slave(void) +{ + do_init_slave(FALSE); +} + +/* + * i386_init_slave_fast() is called from pmCPUHalt. + * We're running on the idle thread and need to fix up + * some accounting and get it so that the scheduler sees this + * CPU again. + */ +void +i386_init_slave_fast(void) +{ + do_init_slave(TRUE); +} + +#include + +/* TODO: Evaluate global PTEs for the double-mapped translations */ + +uint64_t dblmap_base, dblmap_max; +kernel_segment_command_t *hdescseg; + +pt_entry_t *dblmapL3; +unsigned int dblallocs; +uint64_t dblmap_dist; +extern uint64_t idt64_hndl_table0[]; + + +void doublemap_init(void) { + dblmapL3 = ALLOCPAGES(1); // for 512 1GiB entries + dblallocs++; + + struct { + pt_entry_t entries[PTE_PER_PAGE]; + } * dblmapL2 = ALLOCPAGES(1); // for 512 2MiB entries + dblallocs++; + + dblmapL3[0] = ((uintptr_t)ID_MAP_VTOP(&dblmapL2[0])) + | INTEL_PTE_VALID + | INTEL_PTE_WRITE; + + hdescseg = getsegbynamefromheader(&_mh_execute_header, "__HIB"); + + vm_offset_t hdescb = hdescseg->vmaddr; + unsigned long hdescsz = hdescseg->vmsize; + unsigned long hdescszr = round_page_64(hdescsz); + vm_offset_t hdescc = hdescb, hdesce = hdescb + hdescszr; + + kernel_section_t *thdescsect = getsectbynamefromheader(&_mh_execute_header, "__HIB", "__text"); + vm_offset_t thdescb = thdescsect->addr; + unsigned long thdescsz = thdescsect->size; + unsigned long thdescszr = round_page_64(thdescsz); + vm_offset_t thdesce = thdescb + thdescszr; + + assert((hdescb & 0xFFF) == 0); + /* Mirror HIB translations into the double-mapped pagetable subtree*/ + for(int i = 0; hdescc < hdesce; i++) { + struct { + pt_entry_t entries[PTE_PER_PAGE]; + } * dblmapL1 = ALLOCPAGES(1); + dblallocs++; + dblmapL2[0].entries[i] = ((uintptr_t)ID_MAP_VTOP(&dblmapL1[0])) | INTEL_PTE_VALID | INTEL_PTE_WRITE | INTEL_PTE_REF; + int hdescn = (int) ((hdesce - hdescc) / PAGE_SIZE); + for (int j = 0; j < MIN(PTE_PER_PAGE, hdescn); j++) { + uint64_t template = INTEL_PTE_VALID; + if ((hdescc >= thdescb) && (hdescc < thdesce)) { + /* executable */ + } else { + template |= INTEL_PTE_WRITE | INTEL_PTE_NX ; /* Writeable, NX */ + } + dblmapL1[0].entries[j] = ((uintptr_t)ID_MAP_VTOP(hdescc)) | template; + hdescc += PAGE_SIZE; + } + } + + IdlePML4[KERNEL_DBLMAP_PML4_INDEX] = ((uintptr_t)ID_MAP_VTOP(dblmapL3)) | INTEL_PTE_VALID | INTEL_PTE_WRITE | INTEL_PTE_REF; + + dblmap_base = KVADDR(KERNEL_DBLMAP_PML4_INDEX, dblmapL3, 0, 0); + dblmap_max = dblmap_base + hdescszr; + /* Calculate the double-map distance, which accounts for the current + * KASLR slide + */ + + dblmap_dist = dblmap_base - hdescb; + idt64_hndl_table0[1] = DBLMAP(idt64_hndl_table0[1]); + idt64_hndl_table0[6] = (uint64_t)(uintptr_t)&kernel_stack_mask; + + extern cpu_data_t cpshadows[], scdatas[]; + uintptr_t cd1 = (uintptr_t) &cpshadows[0]; + uintptr_t cd2 = (uintptr_t) &scdatas[0]; +/* Record the displacement from the kernel's per-CPU data pointer, eventually + * programmed into GSBASE, to the "shadows" in the doublemapped + * region. These are not aliases, but separate physical allocations + * containing data required in the doublemapped trampolines. +*/ + idt64_hndl_table0[2] = dblmap_dist + cd1 - cd2; + + DBG("Double map base: 0x%qx\n", dblmap_base); + DBG("double map idlepml4[%d]: 0x%llx\n", KERNEL_DBLMAP_PML4_INDEX, IdlePML4[KERNEL_DBLMAP_PML4_INDEX]); + assert(LDTSZ > LDTSZ_MIN); +} + +vm_offset_t dyn_dblmap(vm_offset_t, vm_offset_t); + +#include + +/* Use of this routine is expected to be synchronized by callers + * Creates non-executable aliases. + */ +vm_offset_t dyn_dblmap(vm_offset_t cva, vm_offset_t sz) { + vm_offset_t ava = dblmap_max; + + assert((sz & PAGE_MASK) == 0); + assert(cva != 0); + + pmap_alias(ava, cva, cva + sz, VM_PROT_READ | VM_PROT_WRITE, PMAP_EXPAND_OPTIONS_ALIASMAP); + dblmap_max += sz; + return (ava - cva); +} +/* Adjust offsets interior to the bootstrap interrupt descriptor table to redirect + * control to the double-mapped interrupt vectors. The IDTR proper will be + * programmed via cpu_desc_load() + */ +void idt64_remap(void) { + for (int i = 0; i < IDTSZ; i++) { + master_idt64[i].offset64 = DBLMAP(master_idt64[i].offset64); + } }