1a51e3a0ae
[ Based on original patch from Christoph Lameter and Mike Travis. ] Currently pdas and percpu areas are allocated separately. %gs points to local pda and percpu area can be reached using pda->data_offset. This patch folds pda into percpu area. Due to strange gcc requirement, pda needs to be at the beginning of the percpu area so that pda->stack_canary is at %gs:40. To achieve this, a new percpu output section macro - PERCPU_VADDR_PREALLOC() - is added and used to reserve pda sized chunk at the start of the percpu area. After this change, for boot cpu, %gs first points to pda in the data.init area and later during setup_per_cpu_areas() gets updated to point to the actual pda. This means that setup_per_cpu_areas() need to reload %gs for CPU0 while clearing pda area for other cpus as cpu0 already has modified it when control reaches setup_per_cpu_areas(). This patch also removes now unnecessary get_local_pda() and its call sites. A lot of this patch is taken from Mike Travis' "x86_64: Fold pda into per cpu area" patch. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
264 lines
6.6 KiB
ArmAsm
264 lines
6.6 KiB
ArmAsm
/* ld script to make x86-64 Linux kernel
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* Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>;
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*/
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#define LOAD_OFFSET __START_KERNEL_map
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#include <asm-generic/vmlinux.lds.h>
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#include <asm/asm-offsets.h>
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#include <asm/page.h>
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#undef i386 /* in case the preprocessor is a 32bit one */
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OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64", "elf64-x86-64")
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OUTPUT_ARCH(i386:x86-64)
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ENTRY(phys_startup_64)
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jiffies_64 = jiffies;
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_proxy_pda = 1;
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PHDRS {
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text PT_LOAD FLAGS(5); /* R_E */
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data PT_LOAD FLAGS(7); /* RWE */
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user PT_LOAD FLAGS(7); /* RWE */
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data.init PT_LOAD FLAGS(7); /* RWE */
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#ifdef CONFIG_SMP
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percpu PT_LOAD FLAGS(7); /* RWE */
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#endif
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note PT_NOTE FLAGS(0); /* ___ */
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}
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SECTIONS
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{
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. = __START_KERNEL;
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phys_startup_64 = startup_64 - LOAD_OFFSET;
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_text = .; /* Text and read-only data */
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.text : AT(ADDR(.text) - LOAD_OFFSET) {
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/* First the code that has to be first for bootstrapping */
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*(.text.head)
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_stext = .;
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/* Then the rest */
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TEXT_TEXT
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SCHED_TEXT
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LOCK_TEXT
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KPROBES_TEXT
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IRQENTRY_TEXT
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*(.fixup)
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*(.gnu.warning)
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_etext = .; /* End of text section */
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} :text = 0x9090
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NOTES :text :note
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. = ALIGN(16); /* Exception table */
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__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
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__start___ex_table = .;
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*(__ex_table)
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__stop___ex_table = .;
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} :text = 0x9090
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RODATA
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. = ALIGN(PAGE_SIZE); /* Align data segment to page size boundary */
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/* Data */
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.data : AT(ADDR(.data) - LOAD_OFFSET) {
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DATA_DATA
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CONSTRUCTORS
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} :data
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_edata = .; /* End of data section */
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. = ALIGN(PAGE_SIZE);
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. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
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.data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
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*(.data.cacheline_aligned)
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}
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. = ALIGN(CONFIG_X86_INTERNODE_CACHE_BYTES);
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.data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
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*(.data.read_mostly)
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}
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#define VSYSCALL_ADDR (-10*1024*1024)
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#define VSYSCALL_PHYS_ADDR ((LOADADDR(.data.read_mostly) + SIZEOF(.data.read_mostly) + 4095) & ~(4095))
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#define VSYSCALL_VIRT_ADDR ((ADDR(.data.read_mostly) + SIZEOF(.data.read_mostly) + 4095) & ~(4095))
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#define VLOAD_OFFSET (VSYSCALL_ADDR - VSYSCALL_PHYS_ADDR)
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#define VLOAD(x) (ADDR(x) - VLOAD_OFFSET)
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#define VVIRT_OFFSET (VSYSCALL_ADDR - VSYSCALL_VIRT_ADDR)
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#define VVIRT(x) (ADDR(x) - VVIRT_OFFSET)
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. = VSYSCALL_ADDR;
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.vsyscall_0 : AT(VSYSCALL_PHYS_ADDR) { *(.vsyscall_0) } :user
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__vsyscall_0 = VSYSCALL_VIRT_ADDR;
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. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
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.vsyscall_fn : AT(VLOAD(.vsyscall_fn)) { *(.vsyscall_fn) }
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. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
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.vsyscall_gtod_data : AT(VLOAD(.vsyscall_gtod_data))
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{ *(.vsyscall_gtod_data) }
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vsyscall_gtod_data = VVIRT(.vsyscall_gtod_data);
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.vsyscall_clock : AT(VLOAD(.vsyscall_clock))
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{ *(.vsyscall_clock) }
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vsyscall_clock = VVIRT(.vsyscall_clock);
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.vsyscall_1 ADDR(.vsyscall_0) + 1024: AT(VLOAD(.vsyscall_1))
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{ *(.vsyscall_1) }
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.vsyscall_2 ADDR(.vsyscall_0) + 2048: AT(VLOAD(.vsyscall_2))
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{ *(.vsyscall_2) }
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.vgetcpu_mode : AT(VLOAD(.vgetcpu_mode)) { *(.vgetcpu_mode) }
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vgetcpu_mode = VVIRT(.vgetcpu_mode);
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. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
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.jiffies : AT(VLOAD(.jiffies)) { *(.jiffies) }
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jiffies = VVIRT(.jiffies);
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.vsyscall_3 ADDR(.vsyscall_0) + 3072: AT(VLOAD(.vsyscall_3))
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{ *(.vsyscall_3) }
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. = VSYSCALL_VIRT_ADDR + PAGE_SIZE;
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#undef VSYSCALL_ADDR
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#undef VSYSCALL_PHYS_ADDR
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#undef VSYSCALL_VIRT_ADDR
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#undef VLOAD_OFFSET
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#undef VLOAD
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#undef VVIRT_OFFSET
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#undef VVIRT
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. = ALIGN(THREAD_SIZE); /* init_task */
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.data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
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*(.data.init_task)
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}:data.init
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. = ALIGN(PAGE_SIZE);
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.data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
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*(.data.page_aligned)
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}
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/* might get freed after init */
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. = ALIGN(PAGE_SIZE);
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__smp_alt_begin = .;
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__smp_locks = .;
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.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
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*(.smp_locks)
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}
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__smp_locks_end = .;
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. = ALIGN(PAGE_SIZE);
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__smp_alt_end = .;
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. = ALIGN(PAGE_SIZE); /* Init code and data */
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__init_begin = .;
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.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
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_sinittext = .;
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INIT_TEXT
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_einittext = .;
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}
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.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
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__initdata_begin = .;
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INIT_DATA
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__initdata_end = .;
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}
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. = ALIGN(16);
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__setup_start = .;
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.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) { *(.init.setup) }
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__setup_end = .;
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__initcall_start = .;
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.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
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INITCALLS
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}
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__initcall_end = .;
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__con_initcall_start = .;
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.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
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*(.con_initcall.init)
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}
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__con_initcall_end = .;
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__x86_cpu_dev_start = .;
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.x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
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*(.x86_cpu_dev.init)
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}
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__x86_cpu_dev_end = .;
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SECURITY_INIT
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. = ALIGN(8);
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.parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
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__parainstructions = .;
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*(.parainstructions)
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__parainstructions_end = .;
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}
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. = ALIGN(8);
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__alt_instructions = .;
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.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
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*(.altinstructions)
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}
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__alt_instructions_end = .;
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.altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
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*(.altinstr_replacement)
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}
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/* .exit.text is discard at runtime, not link time, to deal with references
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from .altinstructions and .eh_frame */
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.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
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EXIT_TEXT
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}
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.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
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EXIT_DATA
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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. = ALIGN(PAGE_SIZE);
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__initramfs_start = .;
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.init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { *(.init.ramfs) }
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__initramfs_end = .;
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#endif
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#ifdef CONFIG_SMP
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/*
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* percpu offsets are zero-based on SMP. PERCPU_VADDR() changes the
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* output PHDR, so the next output section - __data_nosave - should
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* switch it back to data.init. Also, pda should be at the head of
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* percpu area. Preallocate it.
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*/
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. = ALIGN(PAGE_SIZE);
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PERCPU_VADDR_PREALLOC(0, :percpu, pda_size)
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#else
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PERCPU(PAGE_SIZE)
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#endif
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. = ALIGN(PAGE_SIZE);
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__init_end = .;
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. = ALIGN(PAGE_SIZE);
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__nosave_begin = .;
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.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
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*(.data.nosave)
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} :data.init /* switch back to data.init, see PERCPU_VADDR() above */
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. = ALIGN(PAGE_SIZE);
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__nosave_end = .;
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__bss_start = .; /* BSS */
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.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
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*(.bss.page_aligned)
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*(.bss)
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}
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__bss_stop = .;
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_end = . ;
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/* Sections to be discarded */
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/DISCARD/ : {
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*(.exitcall.exit)
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*(.eh_frame)
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}
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STABS_DEBUG
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DWARF_DEBUG
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}
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/*
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* Build-time check on the image size:
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*/
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ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),
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"kernel image bigger than KERNEL_IMAGE_SIZE")
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