| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * arch/arm/mach-spear13XX/headsmp.S |
| * |
| * Picked from realview |
| * Copyright (c) 2012 ST Microelectronics Limited |
| * Shiraz Hashim <shiraz.linux.kernel@gmail.com> |
| */ |
| |
| #include <linux/linkage.h> |
| #include <linux/init.h> |
| |
| __INIT |
| |
| /* |
| * spear13xx specific entry point for secondary CPUs. This provides |
| * a "holding pen" into which all secondary cores are held until we're |
| * ready for them to initialise. |
| */ |
| ENTRY(spear13xx_secondary_startup) |
| mrc p15, 0, r0, c0, c0, 5 |
| and r0, r0, #15 |
| adr r4, 1f |
| ldmia r4, {r5, r6} |
| sub r4, r4, r5 |
| add r6, r6, r4 |
| pen: ldr r7, [r6] |
| cmp r7, r0 |
| bne pen |
| |
| /* re-enable coherency */ |
| mrc p15, 0, r0, c1, c0, 1 |
| orr r0, r0, #(1 << 6) | (1 << 0) |
| mcr p15, 0, r0, c1, c0, 1 |
| /* |
| * we've been released from the holding pen: secondary_stack |
| * should now contain the SVC stack for this core |
| */ |
| b secondary_startup |
| |
| .align |
| 1: .long . |
| .long spear_pen_release |
| ENDPROC(spear13xx_secondary_startup) |
