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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
commitb4b7ff4b08e691656c9d77c758fc355833128ac0 (patch)
tree82fcb00e6b918026dc9f2d1f05ed8eee83874cc0 /arch/arm/mach-uniphier/headsmp.S
parent35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (diff)
Linux-libre 4.4-gnupck-4.4-gnu
Diffstat (limited to 'arch/arm/mach-uniphier/headsmp.S')
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+/*
+ * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/cp15.h>
+
+ENTRY(uniphier_smp_trampoline)
+ARM_BE8(setend be) @ ensure we are in BE8 mode
+ mrc p15, 0, r0, c0, c0, 5 @ MPIDR (Multiprocessor Affinity Reg)
+ and r2, r0, #0x3 @ CPU ID
+ ldr r1, uniphier_smp_trampoline_jump
+ ldr r3, uniphier_smp_trampoline_poll_addr
+ mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Control Register)
+ orr r0, r0, #CR_I @ Enable ICache
+ bic r0, r0, #(CR_C | CR_M) @ Disable MMU and Dcache
+ mcr p15, 0, r0, c1, c0, 0
+ b 1f @ cache the following 5 instructions
+0: wfe
+1: ldr r0, [r3]
+ cmp r0, r2
+ bxeq r1 @ branch to secondary_startup
+ b 0b
+ .globl uniphier_smp_trampoline_jump
+uniphier_smp_trampoline_jump:
+ .word 0 @ set virt_to_phys(secondary_startup)
+ .globl uniphier_smp_trampoline_poll_addr
+uniphier_smp_trampoline_poll_addr:
+ .word 0 @ set CPU ID to be kicked to this reg
+ .globl uniphier_smp_trampoline_end
+uniphier_smp_trampoline_end:
+ENDPROC(uniphier_smp_trampoline)