| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * |
| 3 | * Cloned from linux/arch/arm/mach-realview/headsmp.S |
| 4 | * |
| 5 | * Copyright (c) 2003 ARM Limited |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | #include <linux/linkage.h> |
| 13 | #include <linux/init.h> |
| 14 | |
| 15 | #include <asm/assembler.h> |
| 16 | |
| 17 | /* |
| 18 | * exynos4 specific entry point for secondary CPUs. This provides |
| 19 | * a "holding pen" into which all secondary cores are held until we're |
| 20 | * ready for them to initialise. |
| 21 | */ |
| 22 | ENTRY(exynos4_secondary_startup) |
| 23 | ARM_BE8(setend be) |
| 24 | mrc p15, 0, r0, c0, c0, 5 |
| 25 | and r0, r0, #15 |
| 26 | adr r4, 1f |
| 27 | ldmia r4, {r5, r6} |
| 28 | sub r4, r4, r5 |
| 29 | add r6, r6, r4 |
| 30 | pen: ldr r7, [r6] |
| 31 | cmp r7, r0 |
| 32 | bne pen |
| 33 | |
| 34 | /* |
| 35 | * we've been released from the holding pen: secondary_stack |
| 36 | * should now contain the SVC stack for this core |
| 37 | */ |
| 38 | b secondary_startup |
| 39 | ENDPROC(exynos4_secondary_startup) |
| 40 | |
| 41 | .align 2 |
| 42 | 1: .long . |
| 43 | .long pen_release |