diff options
Diffstat (limited to 'arch/arm64/lib/clear_page.S')
| -rw-r--r-- | arch/arm64/lib/clear_page.S | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/arm64/lib/clear_page.S b/arch/arm64/lib/clear_page.S index 78a9ef66288a..ebde40e7fa2b 100644 --- a/arch/arm64/lib/clear_page.S +++ b/arch/arm64/lib/clear_page.S @@ -14,8 +14,9 @@ * Parameters: * x0 - dest */ -ENTRY(clear_page) +SYM_FUNC_START(__pi_clear_page) mrs x1, dczid_el0 + tbnz x1, #4, 2f /* Branch if DC ZVA is prohibited */ and w1, w1, #0xf mov x2, #4 lsl x1, x2, x1 @@ -25,5 +26,15 @@ ENTRY(clear_page) tst x0, #(PAGE_SIZE - 1) b.ne 1b ret -ENDPROC(clear_page) + +2: stnp xzr, xzr, [x0] + stnp xzr, xzr, [x0, #16] + stnp xzr, xzr, [x0, #32] + stnp xzr, xzr, [x0, #48] + add x0, x0, #64 + tst x0, #(PAGE_SIZE - 1) + b.ne 2b + ret +SYM_FUNC_END(__pi_clear_page) +SYM_FUNC_ALIAS(clear_page, __pi_clear_page) EXPORT_SYMBOL(clear_page) |