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-rw-r--r--arch/arm64/kernel/setup.c239
1 files changed, 150 insertions, 89 deletions
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index d4b740538ad5..23c05dc7a8f2 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -1,20 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* 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/acpi.h>
@@ -23,11 +12,9 @@
#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/cache.h>
-#include <linux/bootmem.h>
#include <linux/screen_info.h>
#include <linux/init.h>
#include <linux/kexec.h>
@@ -36,35 +23,43 @@
#include <linux/interrupt.h>
#include <linux/smp.h>
#include <linux/fs.h>
+#include <linux/panic_notifier.h>
#include <linux/proc_fs.h>
#include <linux/memblock.h>
#include <linux/of_fdt.h>
#include <linux/efi.h>
#include <linux/psci.h>
#include <linux/sched/task.h>
+#include <linux/scs.h>
#include <linux/mm.h>
#include <asm/acpi.h>
#include <asm/fixmap.h>
#include <asm/cpu.h>
#include <asm/cputype.h>
+#include <asm/daifflags.h>
#include <asm/elf.h>
#include <asm/cpufeature.h>
#include <asm/cpu_ops.h>
#include <asm/kasan.h>
#include <asm/numa.h>
+#include <asm/rsi.h>
+#include <asm/scs.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/efi.h>
#include <asm/xen/hypervisor.h>
#include <asm/mmu_context.h>
+static int num_standard_resources;
+static struct resource *standard_resources;
+
phys_addr_t __fdt_pointer __initdata;
+u64 mmu_enabled_at_boot __initdata;
/*
* Standard memory resources
@@ -95,15 +90,10 @@ u64 __cacheline_aligned boot_args[4];
void __init smp_setup_processor_id(void)
{
u64 mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
- cpu_logical_map(0) = mpidr;
+ set_cpu_logical_map(0, mpidr);
- /*
- * 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);
- pr_info("Booting Linux on physical CPU 0x%lx\n", (unsigned long)mpidr);
+ pr_info("Booting Linux on physical CPU 0x%010lx [0x%08x]\n",
+ (unsigned long)mpidr, read_cpuid_id());
}
bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
@@ -179,20 +169,36 @@ static void __init smp_build_mpidr_hash(void)
static void __init setup_machine_fdt(phys_addr_t dt_phys)
{
- void *dt_virt = fixmap_remap_fdt(dt_phys);
+ int size = 0;
+ void *dt_virt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
const char *name;
- if (!dt_virt || !early_init_dt_scan(dt_virt)) {
+ if (dt_virt)
+ memblock_reserve(dt_phys, size);
+
+ /*
+ * dt_virt is a fixmap address, hence __pa(dt_virt) can't be used.
+ * Pass dt_phys directly.
+ */
+ if (!early_init_dt_scan(dt_virt, dt_phys)) {
pr_crit("\n"
- "Error: invalid device tree blob at physical address %pa (virtual address 0x%p)\n"
- "The dtb must be 8-byte aligned and must not exceed 2 MB in size\n"
- "\nPlease check your bootloader.",
- &dt_phys, dt_virt);
+ "Error: invalid device tree blob: PA=%pa, VA=%px, size=%d bytes\n"
+ "The dtb must be 8-byte aligned and must not exceed 2 MB in size.\n"
+ "\nPlease check your bootloader.\n",
+ &dt_phys, dt_virt, size);
+ /*
+ * Note that in this _really_ early stage we cannot even BUG()
+ * or oops, so the least terrible thing to do is cpu_relax(),
+ * or else we could end-up printing non-initialized data, etc.
+ */
while (true)
cpu_relax();
}
+ /* Early fixups are done, map the FDT as read-only now */
+ fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);
+
name = of_flat_dt_get_machine_name();
if (!name)
return;
@@ -205,67 +211,107 @@ static void __init request_standard_resources(void)
{
struct memblock_region *region;
struct resource *res;
+ unsigned long i = 0;
+ size_t res_size;
kernel_code.start = __pa_symbol(_text);
kernel_code.end = __pa_symbol(__init_begin - 1);
kernel_data.start = __pa_symbol(_sdata);
kernel_data.end = __pa_symbol(_end - 1);
+ insert_resource(&iomem_resource, &kernel_code);
+ insert_resource(&iomem_resource, &kernel_data);
+
+ num_standard_resources = memblock.memory.cnt;
+ res_size = num_standard_resources * sizeof(*standard_resources);
+ standard_resources = memblock_alloc_or_panic(res_size, SMP_CACHE_BYTES);
- for_each_memblock(memory, region) {
- res = alloc_bootmem_low(sizeof(*res));
+ for_each_mem_region(region) {
+ res = &standard_resources[i++];
if (memblock_is_nomap(region)) {
res->name = "reserved";
res->flags = IORESOURCE_MEM;
+ res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
+ res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
} else {
res->name = "System RAM";
res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+ res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
+ res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
+ }
+
+ insert_resource(&iomem_resource, res);
+ }
+}
+
+static int __init reserve_memblock_reserved_regions(void)
+{
+ u64 i, j;
+
+ for (i = 0; i < num_standard_resources; ++i) {
+ struct resource *mem = &standard_resources[i];
+ phys_addr_t r_start, r_end, mem_size = resource_size(mem);
+
+ if (!memblock_is_region_reserved(mem->start, mem_size))
+ continue;
+
+ for_each_reserved_mem_range(j, &r_start, &r_end) {
+ resource_size_t start, end;
+
+ start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
+ end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
+
+ if (start > mem->end || end < mem->start)
+ continue;
+
+ reserve_region_with_split(mem, start, end, "reserved");
}
- res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
- res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
-
- 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);
-#ifdef CONFIG_KEXEC_CORE
- /* Userspace will find "Crash kernel" region in /proc/iomem. */
- if (crashk_res.end && crashk_res.start >= res->start &&
- crashk_res.end <= res->end)
- request_resource(res, &crashk_res);
-#endif
}
+
+ return 0;
}
+arch_initcall(reserve_memblock_reserved_regions);
u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
-void __init setup_arch(char **cmdline_p)
+u64 cpu_logical_map(unsigned int cpu)
{
- pr_info("Boot CPU: AArch64 Processor [%08x]\n", read_cpuid_id());
+ return __cpu_logical_map[cpu];
+}
- sprintf(init_utsname()->machine, UTS_MACHINE);
- 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;
+void __init __no_sanitize_address setup_arch(char **cmdline_p)
+{
+ setup_initial_init_mm(_text, _etext, _edata, _end);
*cmdline_p = boot_command_line;
+ kaslr_init();
+
early_fixmap_init();
early_ioremap_init();
setup_machine_fdt(__fdt_pointer);
+ /*
+ * Initialise the static keys early as they may be enabled by the
+ * cpufeature code and early parameters.
+ */
+ jump_label_init();
parse_early_param();
+ dynamic_scs_init();
+
/*
- * Unmask asynchronous aborts after bringing up possible earlycon.
- * (Report possible System Errors once we can report this occurred)
+ * The primary CPU enters the kernel with all DAIF exceptions masked.
+ *
+ * We must unmask Debug and SError before preemption or scheduling is
+ * possible to ensure that these are consistently unmasked across
+ * threads, and we want to unmask SError as soon as possible after
+ * initializing earlycon so that we can report any SErrors immediately.
+ *
+ * IRQ and FIQ will be unmasked after the root irqchip has been
+ * detected and initialized.
*/
- local_async_enable();
+ local_daif_restore(DAIF_PROCCTX_NOIRQ);
/*
* TTBR0 is only used for the identity mapping at this stage. Make it
@@ -275,6 +321,14 @@ void __init setup_arch(char **cmdline_p)
xen_early_init();
efi_init();
+
+ if (!efi_enabled(EFI_BOOT)) {
+ if ((u64)_text % MIN_KIMG_ALIGN)
+ pr_warn(FW_BUG "Kernel image misaligned at boot, please fix your bootloader!");
+ WARN_TAINT(mmu_enabled_at_boot, TAINT_FIRMWARE_WORKAROUND,
+ FW_BUG "Booted with MMU enabled!");
+ }
+
arm64_memblock_init();
paging_init();
@@ -300,7 +354,9 @@ void __init setup_arch(char **cmdline_p)
else
psci_acpi_init();
- cpu_read_bootcpu_ops();
+ arm64_rsi_init();
+
+ init_bootcpu_ops();
smp_init_cpus();
smp_build_mpidr_hash();
@@ -310,16 +366,9 @@ void __init setup_arch(char **cmdline_p)
* faults in case uaccess_enable() is inadvertently called by the init
* thread.
*/
- init_task.thread_info.ttbr0 = __pa_symbol(empty_zero_page);
+ init_task.thread_info.ttbr0 = phys_to_ttbr(__pa_symbol(reserved_pg_dir));
#endif
-#ifdef CONFIG_VT
-#if defined(CONFIG_VGA_CONSOLE)
- conswitchp = &vga_con;
-#elif defined(CONFIG_DUMMY_CONSOLE)
- conswitchp = &dummy_con;
-#endif
-#endif
if (boot_args[1] || boot_args[2] || boot_args[3]) {
pr_err("WARNING: x1-x3 nonzero in violation of boot protocol:\n"
"\tx1: %016llx\n\tx2: %016llx\n\tx3: %016llx\n"
@@ -328,48 +377,60 @@ void __init setup_arch(char **cmdline_p)
}
}
-static int __init topology_init(void)
+static inline bool cpu_can_disable(unsigned int cpu)
{
- int i;
-
- for_each_online_node(i)
- register_one_node(i);
+#ifdef CONFIG_HOTPLUG_CPU
+ const struct cpu_operations *ops = get_cpu_ops(cpu);
- for_each_possible_cpu(i) {
- struct cpu *cpu = &per_cpu(cpu_data.cpu, i);
- cpu->hotpluggable = 1;
- register_cpu(cpu, i);
- }
+ if (ops && ops->cpu_can_disable)
+ return ops->cpu_can_disable(cpu);
+#endif
+ return false;
+}
- return 0;
+bool arch_cpu_is_hotpluggable(int num)
+{
+ return cpu_can_disable(num);
}
-subsys_initcall(topology_init);
-/*
- * Dump out kernel offset information on panic.
- */
-static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
- void *p)
+static void dump_kernel_offset(void)
{
const unsigned long offset = kaslr_offset();
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && offset > 0) {
pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
offset, KIMAGE_VADDR);
+ pr_emerg("PHYS_OFFSET: 0x%llx\n", PHYS_OFFSET);
} else {
pr_emerg("Kernel Offset: disabled\n");
}
+}
+
+static int arm64_panic_block_dump(struct notifier_block *self,
+ unsigned long v, void *p)
+{
+ dump_kernel_offset();
+ dump_cpu_features();
+ dump_mem_limit();
return 0;
}
-static struct notifier_block kernel_offset_notifier = {
- .notifier_call = dump_kernel_offset
+static struct notifier_block arm64_panic_block = {
+ .notifier_call = arm64_panic_block_dump
};
-static int __init register_kernel_offset_dumper(void)
+static int __init register_arm64_panic_block(void)
{
atomic_notifier_chain_register(&panic_notifier_list,
- &kernel_offset_notifier);
+ &arm64_panic_block);
+ return 0;
+}
+device_initcall(register_arm64_panic_block);
+
+static int __init check_mmu_enabled_at_boot(void)
+{
+ if (!efi_enabled(EFI_BOOT) && mmu_enabled_at_boot)
+ panic("Non-EFI boot detected with MMU and caches enabled");
return 0;
}
-__initcall(register_kernel_offset_dumper);
+device_initcall_sync(check_mmu_enabled_at_boot);
generated by cgit (git 2.34.1) at 2025-12-25 07:41:19 +0000