/* * SMP support for R-Mobile / SH-Mobile * * Copyright (C) 2010 Magnus Damm * Copyright (C) 2010 Takashi Yoshii * * Based on vexpress, Copyright (c) 2003 ARM Limited, All Rights Reserved * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/init.h> #include <linux/linkage.h> #include <linux/threads.h> #include <asm/assembler.h> #include <asm/memory.h> /* * Reset vector for secondary CPUs. * This will be mapped at address 0 by SBAR register. * We need _long_ jump to the physical address. */ .arm .align 12 ENTRY(shmobile_boot_vector) ldr r1, 1f bx r1 ENDPROC(shmobile_boot_vector) .align 2 .globl shmobile_boot_fn shmobile_boot_fn: 1: .space 4 .globl shmobile_boot_size shmobile_boot_size: .long . - shmobile_boot_vector /* * Per-CPU SMP boot function/argument selection code based on MPIDR */ ENTRY(shmobile_smp_boot) mrc p15, 0, r1, c0, c0, 5 @ r1 = MPIDR and r0, r1, #0xffffff @ MPIDR_HWID_BITMASK @ r0 = cpu_logical_map() value mov r1, #0 @ r1 = CPU index adr r2, 1f ldmia r2, {r5, r6, r7} add r5, r5, r2 @ array of per-cpu mpidr values add r6, r6, r2 @ array of per-cpu functions add r7, r7, r2 @ array of per-cpu arguments shmobile_smp_boot_find_mpidr: ldr r8, [r5, r1, lsl #2] cmp r8, r0 bne shmobile_smp_boot_next ldr r9, [r6, r1, lsl #2] cmp r9, #0 bne shmobile_smp_boot_found shmobile_smp_boot_next: add r1, r1, #1 cmp r1, #NR_CPUS blo shmobile_smp_boot_find_mpidr b shmobile_smp_sleep shmobile_smp_boot_found: ldr r0, [r7, r1, lsl #2] ret r9 ENDPROC(shmobile_smp_boot) ENTRY(shmobile_smp_sleep) wfi b shmobile_smp_boot ENDPROC(shmobile_smp_sleep) .align 2 1: .long shmobile_smp_mpidr - . .long shmobile_smp_fn - 1b .long shmobile_smp_arg - 1b .bss .globl shmobile_smp_mpidr shmobile_smp_mpidr: .space NR_CPUS * 4 .globl shmobile_smp_fn shmobile_smp_fn: .space NR_CPUS * 4 .globl shmobile_smp_arg shmobile_smp_arg: .space NR_CPUS * 4 |