diff options
Diffstat (limited to 'arch/arm64/kernel/vdso')
| -rw-r--r-- | arch/arm64/kernel/vdso/gettimeofday.S | 57 |
1 files changed, 46 insertions, 11 deletions
diff --git a/arch/arm64/kernel/vdso/gettimeofday.S b/arch/arm64/kernel/vdso/gettimeofday.S index c06919ee29e1..e00b4671bd7c 100644 --- a/arch/arm64/kernel/vdso/gettimeofday.S +++ b/arch/arm64/kernel/vdso/gettimeofday.S @@ -87,6 +87,15 @@ x_tmp .req x8 msub \res_nsec, x_tmp, \nsec_to_sec, \res_nsec .endm + /* + * Returns in res_{sec,nsec} the timespec based on the clock_raw delta, + * used for CLOCK_MONOTONIC_RAW. + */ + .macro get_ts_clock_raw res_sec, res_nsec, clock_nsec, nsec_to_sec + udiv \res_sec, \clock_nsec, \nsec_to_sec + msub \res_nsec, \res_sec, \nsec_to_sec, \clock_nsec + .endm + /* sec and nsec are modified in place. */ .macro add_ts sec, nsec, ts_sec, ts_nsec, nsec_to_sec /* Add timespec. */ @@ -135,7 +144,8 @@ ENTRY(__kernel_gettimeofday) 1: seqcnt_acquire syscall_check fail=4f ldr x10, [vdso_data, #VDSO_CS_CYCLE_LAST] - ldp w11, w12, [vdso_data, #VDSO_CS_MULT] + /* w11 = cs_mono_mult, w12 = cs_shift */ + ldp w11, w12, [vdso_data, #VDSO_CS_MONO_MULT] ldp x13, x14, [vdso_data, #VDSO_XTIME_CLK_SEC] seqcnt_check fail=1b @@ -172,20 +182,20 @@ ENDPROC(__kernel_gettimeofday) /* int __kernel_clock_gettime(clockid_t clock_id, struct timespec *tp); */ ENTRY(__kernel_clock_gettime) .cfi_startproc - cmp w0, #JUMPSLOT_MAX - b.hi syscall + cmp w0, #JUMPSLOT_MAX + b.hi syscall adr vdso_data, _vdso_data - adr x_tmp, jumptable - add x_tmp, x_tmp, w0, uxtw #2 - br x_tmp + adr x_tmp, jumptable + add x_tmp, x_tmp, w0, uxtw #2 + br x_tmp ALIGN jumptable: jump_slot jumptable, CLOCK_REALTIME, realtime jump_slot jumptable, CLOCK_MONOTONIC, monotonic - b syscall - b syscall - b syscall + b syscall + b syscall + jump_slot jumptable, CLOCK_MONOTONIC_RAW, monotonic_raw jump_slot jumptable, CLOCK_REALTIME_COARSE, realtime_coarse jump_slot jumptable, CLOCK_MONOTONIC_COARSE, monotonic_coarse @@ -198,7 +208,8 @@ realtime: seqcnt_acquire syscall_check fail=syscall ldr x10, [vdso_data, #VDSO_CS_CYCLE_LAST] - ldp w11, w12, [vdso_data, #VDSO_CS_MULT] + /* w11 = cs_mono_mult, w12 = cs_shift */ + ldp w11, w12, [vdso_data, #VDSO_CS_MONO_MULT] ldp x13, x14, [vdso_data, #VDSO_XTIME_CLK_SEC] seqcnt_check fail=realtime @@ -216,7 +227,8 @@ monotonic: seqcnt_acquire syscall_check fail=syscall ldr x10, [vdso_data, #VDSO_CS_CYCLE_LAST] - ldp w11, w12, [vdso_data, #VDSO_CS_MULT] + /* w11 = cs_mono_mult, w12 = cs_shift */ + ldp w11, w12, [vdso_data, #VDSO_CS_MONO_MULT] ldp x13, x14, [vdso_data, #VDSO_XTIME_CLK_SEC] ldp x3, x4, [vdso_data, #VDSO_WTM_CLK_SEC] seqcnt_check fail=monotonic @@ -234,6 +246,28 @@ monotonic: clock_gettime_return, shift=1 ALIGN +monotonic_raw: + seqcnt_acquire + syscall_check fail=syscall + ldr x10, [vdso_data, #VDSO_CS_CYCLE_LAST] + /* w11 = cs_raw_mult, w12 = cs_shift */ + ldp w12, w11, [vdso_data, #VDSO_CS_SHIFT] + ldp x13, x14, [vdso_data, #VDSO_RAW_TIME_SEC] + seqcnt_check fail=monotonic_raw + + /* All computations are done with left-shifted nsecs. */ + lsl x14, x14, x12 + get_nsec_per_sec res=x9 + lsl x9, x9, x12 + + get_clock_shifted_nsec res=x15, cycle_last=x10, mult=x11 + get_ts_clock_raw res_sec=x10, res_nsec=x11, \ + clock_nsec=x15, nsec_to_sec=x9 + + add_ts sec=x10, nsec=x11, ts_sec=x13, ts_nsec=x14, nsec_to_sec=x9 + clock_gettime_return, shift=1 + + ALIGN realtime_coarse: seqcnt_acquire ldp x10, x11, [vdso_data, #VDSO_XTIME_CRS_SEC] @@ -265,6 +299,7 @@ ENTRY(__kernel_clock_getres) .cfi_startproc cmp w0, #CLOCK_REALTIME ccmp w0, #CLOCK_MONOTONIC, #0x4, ne + ccmp w0, #CLOCK_MONOTONIC_RAW, #0x4, ne b.ne 1f ldr x2, 5f |