452 lines
11 KiB
C
452 lines
11 KiB
C
/*
|
|
* Based on arch/arm/kernel/setup.c
|
|
*
|
|
* Copyright (C) 1995-2001 Russell King
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/initrd.h>
|
|
#include <linux/console.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/screen_info.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/crash_dump.h>
|
|
#include <linux/root_dev.h>
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/of_platform.h>
|
|
|
|
#include <asm/cputype.h>
|
|
#include <asm/elf.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/cpu_ops.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/smp_plat.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/traps.h>
|
|
#include <asm/memblock.h>
|
|
#include <asm/psci.h>
|
|
|
|
unsigned int processor_id;
|
|
EXPORT_SYMBOL(processor_id);
|
|
|
|
unsigned long elf_hwcap __read_mostly;
|
|
EXPORT_SYMBOL_GPL(elf_hwcap);
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
#define COMPAT_ELF_HWCAP_DEFAULT \
|
|
(COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
|
|
COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
|
|
COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
|
|
COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
|
|
COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV)
|
|
unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT;
|
|
#endif
|
|
|
|
static const char *cpu_name;
|
|
static const char *machine_name;
|
|
phys_addr_t __fdt_pointer __initdata;
|
|
|
|
/*
|
|
* Standard memory resources
|
|
*/
|
|
static struct resource mem_res[] = {
|
|
{
|
|
.name = "Kernel code",
|
|
.start = 0,
|
|
.end = 0,
|
|
.flags = IORESOURCE_MEM
|
|
},
|
|
{
|
|
.name = "Kernel data",
|
|
.start = 0,
|
|
.end = 0,
|
|
.flags = IORESOURCE_MEM
|
|
}
|
|
};
|
|
|
|
#define kernel_code mem_res[0]
|
|
#define kernel_data mem_res[1]
|
|
|
|
void __init early_print(const char *str, ...)
|
|
{
|
|
char buf[256];
|
|
va_list ap;
|
|
|
|
va_start(ap, str);
|
|
vsnprintf(buf, sizeof(buf), str, ap);
|
|
va_end(ap);
|
|
|
|
printk("%s", buf);
|
|
}
|
|
|
|
void __init smp_setup_processor_id(void)
|
|
{
|
|
/*
|
|
* clear __my_cpu_offset on boot CPU to avoid hang caused by
|
|
* using percpu variable early, for example, lockdep will
|
|
* access percpu variable inside lock_release
|
|
*/
|
|
set_my_cpu_offset(0);
|
|
}
|
|
|
|
bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
|
|
{
|
|
return phys_id == cpu_logical_map(cpu);
|
|
}
|
|
|
|
struct mpidr_hash mpidr_hash;
|
|
#ifdef CONFIG_SMP
|
|
/**
|
|
* smp_build_mpidr_hash - Pre-compute shifts required at each affinity
|
|
* level in order to build a linear index from an
|
|
* MPIDR value. Resulting algorithm is a collision
|
|
* free hash carried out through shifting and ORing
|
|
*/
|
|
static void __init smp_build_mpidr_hash(void)
|
|
{
|
|
u32 i, affinity, fs[4], bits[4], ls;
|
|
u64 mask = 0;
|
|
/*
|
|
* Pre-scan the list of MPIDRS and filter out bits that do
|
|
* not contribute to affinity levels, ie they never toggle.
|
|
*/
|
|
for_each_possible_cpu(i)
|
|
mask |= (cpu_logical_map(i) ^ cpu_logical_map(0));
|
|
pr_debug("mask of set bits %#llx\n", mask);
|
|
/*
|
|
* Find and stash the last and first bit set at all affinity levels to
|
|
* check how many bits are required to represent them.
|
|
*/
|
|
for (i = 0; i < 4; i++) {
|
|
affinity = MPIDR_AFFINITY_LEVEL(mask, i);
|
|
/*
|
|
* Find the MSB bit and LSB bits position
|
|
* to determine how many bits are required
|
|
* to express the affinity level.
|
|
*/
|
|
ls = fls(affinity);
|
|
fs[i] = affinity ? ffs(affinity) - 1 : 0;
|
|
bits[i] = ls - fs[i];
|
|
}
|
|
/*
|
|
* An index can be created from the MPIDR_EL1 by isolating the
|
|
* significant bits at each affinity level and by shifting
|
|
* them in order to compress the 32 bits values space to a
|
|
* compressed set of values. This is equivalent to hashing
|
|
* the MPIDR_EL1 through shifting and ORing. It is a collision free
|
|
* hash though not minimal since some levels might contain a number
|
|
* of CPUs that is not an exact power of 2 and their bit
|
|
* representation might contain holes, eg MPIDR_EL1[7:0] = {0x2, 0x80}.
|
|
*/
|
|
mpidr_hash.shift_aff[0] = MPIDR_LEVEL_SHIFT(0) + fs[0];
|
|
mpidr_hash.shift_aff[1] = MPIDR_LEVEL_SHIFT(1) + fs[1] - bits[0];
|
|
mpidr_hash.shift_aff[2] = MPIDR_LEVEL_SHIFT(2) + fs[2] -
|
|
(bits[1] + bits[0]);
|
|
mpidr_hash.shift_aff[3] = MPIDR_LEVEL_SHIFT(3) +
|
|
fs[3] - (bits[2] + bits[1] + bits[0]);
|
|
mpidr_hash.mask = mask;
|
|
mpidr_hash.bits = bits[3] + bits[2] + bits[1] + bits[0];
|
|
pr_debug("MPIDR hash: aff0[%u] aff1[%u] aff2[%u] aff3[%u] mask[%#llx] bits[%u]\n",
|
|
mpidr_hash.shift_aff[0],
|
|
mpidr_hash.shift_aff[1],
|
|
mpidr_hash.shift_aff[2],
|
|
mpidr_hash.shift_aff[3],
|
|
mpidr_hash.mask,
|
|
mpidr_hash.bits);
|
|
/*
|
|
* 4x is an arbitrary value used to warn on a hash table much bigger
|
|
* than expected on most systems.
|
|
*/
|
|
if (mpidr_hash_size() > 4 * num_possible_cpus())
|
|
pr_warn("Large number of MPIDR hash buckets detected\n");
|
|
__flush_dcache_area(&mpidr_hash, sizeof(struct mpidr_hash));
|
|
}
|
|
#endif
|
|
|
|
static void __init setup_processor(void)
|
|
{
|
|
struct cpu_info *cpu_info;
|
|
u64 features, block;
|
|
|
|
cpu_info = lookup_processor_type(read_cpuid_id());
|
|
if (!cpu_info) {
|
|
printk("CPU configuration botched (ID %08x), unable to continue.\n",
|
|
read_cpuid_id());
|
|
while (1);
|
|
}
|
|
|
|
cpu_name = cpu_info->cpu_name;
|
|
|
|
printk("CPU: %s [%08x] revision %d\n",
|
|
cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
|
|
|
|
sprintf(init_utsname()->machine, ELF_PLATFORM);
|
|
elf_hwcap = 0;
|
|
|
|
/*
|
|
* ID_AA64ISAR0_EL1 contains 4-bit wide signed feature blocks.
|
|
* The blocks we test below represent incremental functionality
|
|
* for non-negative values. Negative values are reserved.
|
|
*/
|
|
features = read_cpuid(ID_AA64ISAR0_EL1);
|
|
block = (features >> 4) & 0xf;
|
|
if (!(block & 0x8)) {
|
|
switch (block) {
|
|
default:
|
|
case 2:
|
|
elf_hwcap |= HWCAP_PMULL;
|
|
case 1:
|
|
elf_hwcap |= HWCAP_AES;
|
|
case 0:
|
|
break;
|
|
}
|
|
}
|
|
|
|
block = (features >> 8) & 0xf;
|
|
if (block && !(block & 0x8))
|
|
elf_hwcap |= HWCAP_SHA1;
|
|
|
|
block = (features >> 12) & 0xf;
|
|
if (block && !(block & 0x8))
|
|
elf_hwcap |= HWCAP_SHA2;
|
|
|
|
block = (features >> 16) & 0xf;
|
|
if (block && !(block & 0x8))
|
|
elf_hwcap |= HWCAP_CRC32;
|
|
}
|
|
|
|
static void __init setup_machine_fdt(phys_addr_t dt_phys)
|
|
{
|
|
if (!dt_phys || !early_init_dt_scan(phys_to_virt(dt_phys))) {
|
|
early_print("\n"
|
|
"Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
|
|
"The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
|
|
"\nPlease check your bootloader.\n",
|
|
dt_phys, phys_to_virt(dt_phys));
|
|
|
|
while (true)
|
|
cpu_relax();
|
|
}
|
|
|
|
machine_name = of_flat_dt_get_machine_name();
|
|
}
|
|
|
|
/*
|
|
* Limit the memory size that was specified via FDT.
|
|
*/
|
|
static int __init early_mem(char *p)
|
|
{
|
|
phys_addr_t limit;
|
|
|
|
if (!p)
|
|
return 1;
|
|
|
|
limit = memparse(p, &p) & PAGE_MASK;
|
|
pr_notice("Memory limited to %lldMB\n", limit >> 20);
|
|
|
|
memblock_enforce_memory_limit(limit);
|
|
|
|
return 0;
|
|
}
|
|
early_param("mem", early_mem);
|
|
|
|
static void __init request_standard_resources(void)
|
|
{
|
|
struct memblock_region *region;
|
|
struct resource *res;
|
|
|
|
kernel_code.start = virt_to_phys(_text);
|
|
kernel_code.end = virt_to_phys(_etext - 1);
|
|
kernel_data.start = virt_to_phys(_sdata);
|
|
kernel_data.end = virt_to_phys(_end - 1);
|
|
|
|
for_each_memblock(memory, region) {
|
|
res = alloc_bootmem_low(sizeof(*res));
|
|
res->name = "System RAM";
|
|
res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
|
|
res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
|
|
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
|
|
|
|
request_resource(&iomem_resource, res);
|
|
|
|
if (kernel_code.start >= res->start &&
|
|
kernel_code.end <= res->end)
|
|
request_resource(res, &kernel_code);
|
|
if (kernel_data.start >= res->start &&
|
|
kernel_data.end <= res->end)
|
|
request_resource(res, &kernel_data);
|
|
}
|
|
}
|
|
|
|
u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
|
|
|
|
void __init setup_arch(char **cmdline_p)
|
|
{
|
|
/*
|
|
* Unmask asynchronous aborts early to catch possible system errors.
|
|
*/
|
|
local_async_enable();
|
|
|
|
setup_processor();
|
|
|
|
setup_machine_fdt(__fdt_pointer);
|
|
|
|
init_mm.start_code = (unsigned long) _text;
|
|
init_mm.end_code = (unsigned long) _etext;
|
|
init_mm.end_data = (unsigned long) _edata;
|
|
init_mm.brk = (unsigned long) _end;
|
|
|
|
*cmdline_p = boot_command_line;
|
|
|
|
parse_early_param();
|
|
|
|
arm64_memblock_init();
|
|
|
|
paging_init();
|
|
request_standard_resources();
|
|
|
|
unflatten_device_tree();
|
|
|
|
psci_init();
|
|
|
|
cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
|
|
cpu_read_bootcpu_ops();
|
|
#ifdef CONFIG_SMP
|
|
smp_init_cpus();
|
|
smp_build_mpidr_hash();
|
|
#endif
|
|
|
|
#ifdef CONFIG_VT
|
|
#if defined(CONFIG_VGA_CONSOLE)
|
|
conswitchp = &vga_con;
|
|
#elif defined(CONFIG_DUMMY_CONSOLE)
|
|
conswitchp = &dummy_con;
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
static int __init arm64_device_init(void)
|
|
{
|
|
of_clk_init(NULL);
|
|
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
|
|
return 0;
|
|
}
|
|
arch_initcall(arm64_device_init);
|
|
|
|
static DEFINE_PER_CPU(struct cpu, cpu_data);
|
|
|
|
static int __init topology_init(void)
|
|
{
|
|
int i;
|
|
|
|
for_each_possible_cpu(i) {
|
|
struct cpu *cpu = &per_cpu(cpu_data, i);
|
|
cpu->hotpluggable = 1;
|
|
register_cpu(cpu, i);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall(topology_init);
|
|
|
|
static const char *hwcap_str[] = {
|
|
"fp",
|
|
"asimd",
|
|
"evtstrm",
|
|
"aes",
|
|
"pmull",
|
|
"sha1",
|
|
"sha2",
|
|
"crc32",
|
|
NULL
|
|
};
|
|
|
|
static int c_show(struct seq_file *m, void *v)
|
|
{
|
|
int i;
|
|
|
|
seq_printf(m, "Processor\t: %s rev %d (%s)\n",
|
|
cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
|
|
|
|
for_each_online_cpu(i) {
|
|
/*
|
|
* glibc reads /proc/cpuinfo to determine the number of
|
|
* online processors, looking for lines beginning with
|
|
* "processor". Give glibc what it expects.
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
seq_printf(m, "processor\t: %d\n", i);
|
|
#endif
|
|
}
|
|
|
|
/* dump out the processor features */
|
|
seq_puts(m, "Features\t: ");
|
|
|
|
for (i = 0; hwcap_str[i]; i++)
|
|
if (elf_hwcap & (1 << i))
|
|
seq_printf(m, "%s ", hwcap_str[i]);
|
|
|
|
seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
|
|
seq_printf(m, "CPU architecture: AArch64\n");
|
|
seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
|
|
seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
|
|
seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
|
|
|
|
seq_puts(m, "\n");
|
|
|
|
seq_printf(m, "Hardware\t: %s\n", machine_name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void *c_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
return *pos < 1 ? (void *)1 : NULL;
|
|
}
|
|
|
|
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
|
|
{
|
|
++*pos;
|
|
return NULL;
|
|
}
|
|
|
|
static void c_stop(struct seq_file *m, void *v)
|
|
{
|
|
}
|
|
|
|
const struct seq_operations cpuinfo_op = {
|
|
.start = c_start,
|
|
.next = c_next,
|
|
.stop = c_stop,
|
|
.show = c_show
|
|
};
|