| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* |
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| 3 | * arch/arm/mach-spear13XX/headsmp.S |
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| 4 | * |
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| 5 | * Picked from realview |
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| 6 | * Copyright (c) 2012 ST Microelectronics Limited |
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| 7 | * Shiraz Hashim <shiraz.linux.kernel@gmail.com> |
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| 8 | */ |
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| 9 | |
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| 10 | #include <linux/linkage.h> |
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| 11 | #include <linux/init.h> |
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| 12 | |
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| 13 | __INIT |
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| 14 | |
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| 15 | /* |
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| 16 | * spear13xx specific entry point for secondary CPUs. This provides |
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| 17 | * a "holding pen" into which all secondary cores are held until we're |
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| 18 | * ready for them to initialise. |
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| 19 | */ |
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| 20 | ENTRY(spear13xx_secondary_startup) |
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| 21 | mrc p15, 0, r0, c0, c0, 5 |
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| 22 | and r0, r0, #15 |
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| 23 | adr r4, 1f |
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| 24 | ldmia r4, {r5, r6} |
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| 25 | sub r4, r4, r5 |
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| 26 | add r6, r6, r4 |
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| 27 | pen: ldr r7, [r6] |
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| 28 | cmp r7, r0 |
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| 29 | bne pen |
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| 30 | |
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| 31 | /* re-enable coherency */ |
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| 32 | mrc p15, 0, r0, c1, c0, 1 |
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| 33 | orr r0, r0, #(1 << 6) | (1 << 0) |
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| 34 | mcr p15, 0, r0, c1, c0, 1 |
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| 35 | /* |
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| 36 | * we've been released from the holding pen: secondary_stack |
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| 37 | * should now contain the SVC stack for this core |
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| 38 | */ |
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| 39 | b secondary_startup |
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| 40 | |
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| 41 | .align |
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| 42 | 1: .long . |
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| 43 | .long spear_pen_release |
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| 44 | ENDPROC(spear13xx_secondary_startup) |
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| 45 | |
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