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arch-setup.cc
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arch-setup.cc
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/*
* Copyright (C) 2013 Cloudius Systems, Ltd.
*
* This work is open source software, licensed under the terms of the
* BSD license as described in the LICENSE file in the top-level directory.
*/
#include <osv/drivers_config.h>
#include "arch.hh"
#include "arch-cpu.hh"
#include "arch-setup.hh"
#include <osv/mempool.hh>
#include <osv/mmu.hh>
#include "processor.hh"
#include "processor-flags.h"
#include "msr.hh"
#if CONF_drivers_xen
#include <osv/xen.hh>
#endif
#include <osv/elf.hh>
#include <osv/types.h>
#include <alloca.h>
#include <string.h>
#include <osv/boot.hh>
#include <osv/commands.hh>
#include "dmi.hh"
#if CONF_drivers_acpi
#include "drivers/acpi.hh"
#endif
osv_multiboot_info_type* osv_multiboot_info;
#if CONF_drivers_mmio
#include "drivers/virtio-mmio.hh"
#endif
void parse_cmdline(multiboot_info_type& mb)
{
auto p = reinterpret_cast<char*>(mb.cmdline);
#if CONF_drivers_mmio
virtio::parse_mmio_device_configuration(p);
#endif
osv::parse_cmdline(p);
}
void setup_temporary_phys_map()
{
// duplicate 1:1 mapping into phys_mem
u64 cr3 = processor::read_cr3();
auto pt = reinterpret_cast<u64*>(cr3);
for (auto&& area : mmu::identity_mapped_areas) {
auto base = reinterpret_cast<void*>(get_mem_area_base(area));
pt[mmu::pt_index(base, 3)] = pt[0];
}
}
void for_each_e820_entry(void* e820_buffer, unsigned size, void (*f)(e820ent e))
{
auto p = e820_buffer;
while (p < e820_buffer + size) {
auto ent = static_cast<e820ent*>(p);
if (ent->type == 1) {
f(*ent);
}
p += ent->ent_size + 4;
}
}
bool intersects(const e820ent& ent, u64 a)
{
return a > ent.addr && a < ent.addr + ent.size;
}
e820ent truncate_below(e820ent ent, u64 a)
{
u64 delta = a - ent.addr;
ent.addr += delta;
ent.size -= delta;
return ent;
}
e820ent truncate_above(e820ent ent, u64 a)
{
u64 delta = ent.addr + ent.size - a;
ent.size -= delta;
return ent;
}
extern elf::Elf64_Ehdr* elf_header;
extern size_t elf_size;
extern void* elf_start;
extern boot_time_chart boot_time;
// Because vmlinux_entry64 replaces start32 as a new entry of loader.elf we need a way
// to place address of start32 so that boot16 know where to jump to. We achieve
// it by placing address of start32 at the known offset at memory
// as defined by section .start32_address in loader.ld
extern "C" void start32();
void * __attribute__((section (".start32_address"))) start32_address =
reinterpret_cast<void*>((long)&start32 - OSV_KERNEL_VM_SHIFT);
extern "C" void start32_from_vmlinuz();
void * __attribute__((section (".start32_from_vmlinuz_address"))) start32_from_vmlinuz_address =
reinterpret_cast<void*>((long)&start32_from_vmlinuz - OSV_KERNEL_VM_SHIFT);
void arch_setup_free_memory()
{
static ulong edata, edata_phys;
asm ("movl $.edata, %0" : "=rm"(edata));
edata_phys = edata - OSV_KERNEL_VM_SHIFT;
// copy to stack so we don't free it now
auto omb = *osv_multiboot_info;
auto mb = omb.mb;
auto e820_buffer = alloca(mb.mmap_length);
auto e820_size = mb.mmap_length;
memcpy(e820_buffer, reinterpret_cast<void*>(mb.mmap_addr), e820_size);
for_each_e820_entry(e820_buffer, e820_size, [] (e820ent ent) {
memory::phys_mem_size += ent.size;
});
constexpr u64 initial_map = 1 << 30; // 1GB mapped by startup code
u64 time;
time = omb.tsc_init_hi;
time = (time << 32) | omb.tsc_init;
boot_time.event(0, "", time );
time = omb.tsc_disk_done_hi;
time = (time << 32) | omb.tsc_disk_done;
boot_time.event(1, "disk read (real mode)", time );
time = omb.tsc_uncompress_done_hi;
time = (time << 32) | omb.tsc_uncompress_done;
boot_time.event(2, "uncompress lzloader.elf", time );
auto c = processor::cpuid(0x80000000);
if (c.a >= 0x80000008) {
c = processor::cpuid(0x80000008);
mmu::phys_bits = c.a & 0xff;
mmu::virt_bits = (c.a >> 8) & 0xff;
if(mmu::phys_bits > mmu::max_phys_bits){
mmu::phys_bits = mmu::max_phys_bits;
}
}
setup_temporary_phys_map();
// setup all memory up to 1GB. We can't free any more, because no
// page tables have been set up, so we can't reference the memory being
// freed.
for_each_e820_entry(e820_buffer, e820_size, [] (e820ent ent) {
// can't free anything below edata_phys, it's core code.
// can't free anything below kernel at this moment
if (ent.addr + ent.size <= edata_phys) {
return;
}
if (intersects(ent, edata_phys)) {
ent = truncate_below(ent, edata_phys);
}
// ignore anything above 1GB, we haven't mapped it yet
if (intersects(ent, initial_map)) {
ent = truncate_above(ent, initial_map);
} else if (ent.addr >= initial_map) {
return;
}
mmu::free_initial_memory_range(ent.addr, ent.size);
});
for (auto&& area : mmu::identity_mapped_areas) {
auto base = reinterpret_cast<void*>(get_mem_area_base(area));
mmu::linear_map(base, 0, initial_map,
area == mmu::mem_area::main ? "main" :
area == mmu::mem_area::page ? "page" : "mempool",
initial_map);
}
// Map the core, loaded by the boot loader
// In order to properly setup mapping between virtual
// and physical we need to take into account where kernel
// is loaded in physical memory - elf_phys_start - and
// where it is linked to start in virtual memory - elf_start
static mmu::phys elf_phys_start = reinterpret_cast<mmu::phys>(elf_header);
// There is simple invariant between elf_phys_start and elf_start
// as expressed by the assignment below
elf_start = reinterpret_cast<void*>(elf_phys_start + OSV_KERNEL_VM_SHIFT);
elf_size = edata_phys - elf_phys_start;
mmu::linear_map(elf_start, elf_phys_start, elf_size, "kernel", OSV_KERNEL_BASE);
// get rid of the command line, before low memory is unmapped
parse_cmdline(mb);
// now that we have some free memory, we can start mapping the rest
mmu::switch_to_runtime_page_tables();
for_each_e820_entry(e820_buffer, e820_size, [] (e820ent ent) {
//
// Free the memory below elf_phys_start which we could not before
if (ent.addr < (u64)elf_phys_start) {
auto ent_below_kernel = ent;
if (ent.addr + ent.size >= (u64)elf_phys_start) {
ent_below_kernel = truncate_above(ent, (u64) elf_phys_start);
}
mmu::free_initial_memory_range(ent_below_kernel.addr, ent_below_kernel.size);
// If there is nothing left below elf_phys_start return
if (ent.addr + ent.size <= (u64)elf_phys_start) {
return;
}
}
//
// Ignore memory already freed above
if (ent.addr + ent.size <= initial_map) {
return;
}
if (intersects(ent, initial_map)) {
ent = truncate_below(ent, initial_map);
}
for (auto&& area : mmu::identity_mapped_areas) {
auto base = reinterpret_cast<void*>(get_mem_area_base(area));
mmu::linear_map(base + ent.addr, ent.addr, ent.size,
area == mmu::mem_area::main ? "main" :
area == mmu::mem_area::page ? "page" : "mempool", ~0);
}
mmu::free_initial_memory_range(ent.addr, ent.size);
});
}
void arch_setup_tls(void *tls, const elf::tls_data& info)
{
struct thread_control_block *tcb;
memcpy(tls, info.start, info.filesize);
memset(tls + info.filesize, 0, info.size - info.filesize);
tcb = (struct thread_control_block *)(tls + info.size);
tcb->self = tcb;
processor::wrmsr(msr::IA32_FS_BASE, reinterpret_cast<uint64_t>(tcb));
}
static inline void disable_pic()
{
#if CONF_drivers_xen
// PIC not present in Xen
XENPV_ALTERNATIVE({ processor::outb(0xff, 0x21); processor::outb(0xff, 0xa1); }, {});
#else
processor::outb(0xff, 0x21);
processor::outb(0xff, 0xa1);
#endif
}
extern "C" void syscall_entry(void);
// SYSCALL Enable
static const int IA32_EFER_SCE = 0x1 << 0;
// Selector shift
static const int CS_SELECTOR_SHIFT = 3;
// syscall shift
static const int IA_32_STAR_SYSCALL_SHIFT = 32;
namespace processor {
void init_syscall() {
unsigned long cs = gdt_cs;
processor::wrmsr(msr::IA32_STAR, (cs << CS_SELECTOR_SHIFT) << IA_32_STAR_SYSCALL_SHIFT);
// lstar is where syscall set rip so we set it to syscall_entry
processor::wrmsr(msr::IA32_LSTAR, reinterpret_cast<uint64_t>(syscall_entry));
// syscall does rflag = rflag and not fmask
// we want no minimize the impact of the syscall instruction so we choose
// fmask as zero
processor::wrmsr(msr::IA32_FMASK, 0);
processor::wrmsr(msr::IA32_EFER, processor::rdmsr(msr::IA32_EFER) | IA32_EFER_SCE);
}
}
void arch_init_premain()
{
auto omb = *osv_multiboot_info;
if (omb.disk_err)
debug_early_u64("Error reading disk (real mode): ", static_cast<u64>(omb.disk_err));
#if CONF_drivers_acpi
acpi::pvh_rsdp_paddr = omb.pvh_rsdp;
#endif
disable_pic();
}
#include "drivers/driver.hh"
#if CONF_drivers_acpi
#include "drivers/pvpanic.hh"
#endif
#if CONF_drivers_virtio
#include "drivers/virtio.hh"
#endif
#if CONF_drivers_virtio_blk
#include "drivers/virtio-blk.hh"
#endif
#if CONF_drivers_virtio_scsi
#include "drivers/virtio-scsi.hh"
#endif
#if CONF_drivers_virtio_net
#include "drivers/virtio-net.hh"
#endif
#if CONF_drivers_virtio_rng
#include "drivers/virtio-rng.hh"
#endif
#if CONF_drivers_virtio_fs
#include "drivers/virtio-fs.hh"
#endif
#if CONF_drivers_xen
#include "drivers/xenplatform-pci.hh"
#endif
#if CONF_drivers_ahci
#include "drivers/ahci.hh"
#endif
#if CONF_drivers_pvscsi
#include "drivers/vmw-pvscsi.hh"
#endif
#if CONF_drivers_vmxnet3
#include "drivers/vmxnet3.hh"
#endif
#if CONF_drivers_ide
#include "drivers/ide.hh"
#endif
#if CONF_drivers_ena
#include "drivers/ena.hh"
#endif
#if CONF_drivers_nvme
#include "drivers/nvme.hh"
#endif
extern bool opt_pci_disabled;
void arch_init_drivers()
{
#if CONF_drivers_acpi
// initialize panic drivers
panic::pvpanic::probe_and_setup();
boot_time.event("pvpanic done");
#endif
#if CONF_drivers_pci
if (!opt_pci_disabled) {
// Enumerate PCI devices
pci::pci_device_enumeration();
boot_time.event("pci enumerated");
}
#endif
#if CONF_drivers_mmio
// Register any parsed virtio-mmio devices
virtio::register_mmio_devices(device_manager::instance());
#endif
// Initialize all drivers
hw::driver_manager* drvman = hw::driver_manager::instance();
#if CONF_drivers_virtio_blk
drvman->register_driver(virtio::blk::probe);
#endif
#if CONF_drivers_virtio_scsi
drvman->register_driver(virtio::scsi::probe);
#endif
#if CONF_drivers_virtio_net
drvman->register_driver(virtio::net::probe);
#endif
#if CONF_drivers_virtio_rng
drvman->register_driver(virtio::rng::probe);
#endif
#if CONF_drivers_virtio_fs
drvman->register_driver(virtio::fs::probe);
#endif
#if CONF_drivers_xen
drvman->register_driver(xenfront::xenplatform_pci::probe);
#endif
#if CONF_drivers_ahci
drvman->register_driver(ahci::hba::probe);
#endif
#if CONF_drivers_pvscsi
drvman->register_driver(vmw::pvscsi::probe);
#endif
#if CONF_drivers_vmxnet3
drvman->register_driver(vmw::vmxnet3::probe);
#endif
#if CONF_drivers_ide
drvman->register_driver(ide::ide_drive::probe);
#endif
#if CONF_drivers_ena
drvman->register_driver(aws::ena::probe);
#endif
#if CONF_drivers_nvme
drvman->register_driver(nvme::driver::probe);
#endif
boot_time.event("drivers probe");
drvman->load_all();
drvman->list_drivers();
}
#include "drivers/console.hh"
#include "drivers/isa-serial.hh"
#if CONF_drivers_vga
#include "drivers/vga.hh"
#endif
#include "early-console.hh"
void arch_init_early_console()
{
console::isa_serial_console::early_init();
}
bool arch_setup_console(std::string opt_console)
{
#if CONF_drivers_vga
hw::driver_manager* drvman = hw::driver_manager::instance();
#endif
if (opt_console.compare("serial") == 0) {
console::console_driver_add(&console::arch_early_console);
#if CONF_drivers_vga
} else if (opt_console.compare("vga") == 0) {
drvman->register_driver(console::VGAConsole::probe);
#endif
} else if (opt_console.compare("all") == 0) {
console::console_driver_add(&console::arch_early_console);
#if CONF_drivers_vga
drvman->register_driver(console::VGAConsole::probe);
#endif
} else {
return false;
}
return true;
}
void reset_bootchart(osv_multiboot_info_type* mb_info)
{
auto now = processor::ticks();
u32 now_high = (u32)(now >> 32);
u32 now_low = (u32)now;
mb_info->tsc_init_hi = now_high;
mb_info->tsc_init = now_low;
mb_info->tsc_disk_done_hi = now_high;
mb_info->tsc_disk_done = now_low;
mb_info->tsc_uncompress_done_hi = now_high;
mb_info->tsc_uncompress_done = now_low;
}