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https://github.com/edk2-porting/linux-next.git
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c742b31c03
The extract cpu time instruction (ectg) instruction allows the user process to get the current thread cputime without calling into the kernel. The code that uses the instruction needs to switch to the access registers mode to get access to the per-cpu info page that contains the two base values that are needed to calculate the current cputime from the CPU timer with the ectg instruction. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
63 lines
2.6 KiB
C
63 lines
2.6 KiB
C
/*
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* Generate definitions needed by assembly language modules.
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* This code generates raw asm output which is post-processed to extract
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* and format the required data.
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*/
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#include <linux/sched.h>
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#include <linux/kbuild.h>
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#include <asm/vdso.h>
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int main(void)
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{
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DEFINE(__THREAD_info, offsetof(struct task_struct, stack));
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DEFINE(__THREAD_ksp, offsetof(struct task_struct, thread.ksp));
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DEFINE(__THREAD_per, offsetof(struct task_struct, thread.per_info));
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DEFINE(__THREAD_mm_segment,
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offsetof(struct task_struct, thread.mm_segment));
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BLANK();
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DEFINE(__TASK_pid, offsetof(struct task_struct, pid));
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BLANK();
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DEFINE(__PER_atmid, offsetof(per_struct, lowcore.words.perc_atmid));
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DEFINE(__PER_address, offsetof(per_struct, lowcore.words.address));
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DEFINE(__PER_access_id, offsetof(per_struct, lowcore.words.access_id));
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BLANK();
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DEFINE(__TI_task, offsetof(struct thread_info, task));
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DEFINE(__TI_domain, offsetof(struct thread_info, exec_domain));
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DEFINE(__TI_flags, offsetof(struct thread_info, flags));
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DEFINE(__TI_cpu, offsetof(struct thread_info, cpu));
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DEFINE(__TI_precount, offsetof(struct thread_info, preempt_count));
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BLANK();
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DEFINE(__PT_ARGS, offsetof(struct pt_regs, args));
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DEFINE(__PT_PSW, offsetof(struct pt_regs, psw));
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DEFINE(__PT_GPRS, offsetof(struct pt_regs, gprs));
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DEFINE(__PT_ORIG_GPR2, offsetof(struct pt_regs, orig_gpr2));
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DEFINE(__PT_ILC, offsetof(struct pt_regs, ilc));
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DEFINE(__PT_SVCNR, offsetof(struct pt_regs, svcnr));
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DEFINE(__PT_SIZE, sizeof(struct pt_regs));
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BLANK();
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DEFINE(__SF_BACKCHAIN, offsetof(struct stack_frame, back_chain));
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DEFINE(__SF_GPRS, offsetof(struct stack_frame, gprs));
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DEFINE(__SF_EMPTY, offsetof(struct stack_frame, empty1));
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BLANK();
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/* timeval/timezone offsets for use by vdso */
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DEFINE(__VDSO_UPD_COUNT, offsetof(struct vdso_data, tb_update_count));
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DEFINE(__VDSO_XTIME_STAMP, offsetof(struct vdso_data, xtime_tod_stamp));
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DEFINE(__VDSO_XTIME_SEC, offsetof(struct vdso_data, xtime_clock_sec));
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DEFINE(__VDSO_XTIME_NSEC, offsetof(struct vdso_data, xtime_clock_nsec));
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DEFINE(__VDSO_WTOM_SEC, offsetof(struct vdso_data, wtom_clock_sec));
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DEFINE(__VDSO_WTOM_NSEC, offsetof(struct vdso_data, wtom_clock_nsec));
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DEFINE(__VDSO_TIMEZONE, offsetof(struct vdso_data, tz_minuteswest));
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DEFINE(__VDSO_ECTG_OK, offsetof(struct vdso_data, ectg_available));
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DEFINE(__VDSO_ECTG_BASE,
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offsetof(struct vdso_per_cpu_data, ectg_timer_base));
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DEFINE(__VDSO_ECTG_USER,
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offsetof(struct vdso_per_cpu_data, ectg_user_time));
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/* constants used by the vdso */
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DEFINE(CLOCK_REALTIME, CLOCK_REALTIME);
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DEFINE(CLOCK_MONOTONIC, CLOCK_MONOTONIC);
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DEFINE(CLOCK_REALTIME_RES, MONOTONIC_RES_NSEC);
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return 0;
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}
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