Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / mach-shmobile / headsmp.S

diff --git a/kernel/arch/arm/mach-shmobile/headsmp.S b/kernel/arch/arm/mach-shmobile/headsmp.S
new file mode 100644 (file)
index 0000000..50c4915
--- /dev/null
+++ b/kernel/arch/arm/mach-shmobile/headsmp.S
@@ -0,0 +1,98 @@
+/*
+ * 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>
+
+#ifdef CONFIG_SMP
+ENTRY(shmobile_invalidate_start)
+       bl      v7_invalidate_l1
+       b       secondary_startup
+ENDPROC(shmobile_invalidate_start)
+#endif
+
+/*
+ * 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     r0, 2f
+       ldr     r1, 1f
+       bx      r1
+
+ENDPROC(shmobile_boot_vector)
+
+       .align  2
+       .globl  shmobile_boot_fn
+shmobile_boot_fn:
+1:     .space  4
+       .globl  shmobile_boot_arg
+shmobile_boot_arg:
+2:     .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)
+                                               @ r0 = MPIDR_HWID_BITMASK
+       mrc     p15, 0, r1, c0, c0, 5           @ r1 = MPIDR
+       and     r0, r1, r0                      @ r0 = cpu_logical_map() value
+       mov     r1, #0                          @ r1 = CPU index
+       adr     r5, 1f                          @ array of per-cpu mpidr values
+       adr     r6, 2f                          @ array of per-cpu functions
+       adr     r7, 3f                          @ 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)
+
+       .globl  shmobile_smp_mpidr
+shmobile_smp_mpidr:
+1:     .space  NR_CPUS * 4
+       .globl  shmobile_smp_fn
+shmobile_smp_fn:
+2:     .space  NR_CPUS * 4
+       .globl  shmobile_smp_arg
+shmobile_smp_arg:
+3:     .space  NR_CPUS * 4