| Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 1 | /* SMP IPI low-level handler |
| 2 | * |
| 3 | * Copyright (C) 2006-2007 Matsushita Electric Industrial Co., Ltd. |
| 4 | * All Rights Reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <linux/sys.h> |
| 14 | #include <linux/linkage.h> |
| 15 | #include <asm/smp.h> |
| 16 | #include <asm/system.h> |
| 17 | #include <asm/thread_info.h> |
| 18 | #include <asm/cpu-regs.h> |
| 19 | #include <proc/smp-regs.h> |
| 20 | #include <asm/asm-offsets.h> |
| 21 | #include <asm/frame.inc> |
| 22 | |
| 23 | .am33_2 |
| 24 | |
| 25 | ############################################################################### |
| 26 | # |
| 27 | # IPI interrupt handler |
| 28 | # |
| 29 | ############################################################################### |
| 30 | .globl mn10300_low_ipi_handler |
| 31 | mn10300_low_ipi_handler: |
| 32 | add -4,sp |
| 33 | mov d0,(sp) |
| 34 | movhu (IAGR),d0 |
| 35 | and IAGR_GN,d0 |
| 36 | lsr 0x2,d0 |
| 37 | #ifdef CONFIG_MN10300_CACHE_ENABLED |
| 38 | cmp FLUSH_CACHE_IPI,d0 |
| 39 | beq mn10300_flush_cache_ipi |
| 40 | #endif |
| 41 | cmp SMP_BOOT_IRQ,d0 |
| 42 | beq mn10300_smp_boot_ipi |
| 43 | /* OTHERS */ |
| 44 | mov (sp),d0 |
| 45 | add 4,sp |
| 46 | #ifdef CONFIG_GDBSTUB |
| 47 | jmp gdbstub_io_rx_handler |
| 48 | #else |
| 49 | jmp end |
| 50 | #endif |
| 51 | |
| 52 | ############################################################################### |
| 53 | # |
| 54 | # Cache flush IPI interrupt handler |
| 55 | # |
| 56 | ############################################################################### |
| 57 | #ifdef CONFIG_MN10300_CACHE_ENABLED |
| 58 | mn10300_flush_cache_ipi: |
| 59 | mov (sp),d0 |
| 60 | add 4,sp |
| 61 | |
| 62 | /* FLUSH_CACHE_IPI */ |
| 63 | add -4,sp |
| 64 | SAVE_ALL |
| 65 | mov GxICR_DETECT,d2 |
| 66 | movbu d2,(GxICR(FLUSH_CACHE_IPI)) # ACK the interrupt |
| 67 | movhu (GxICR(FLUSH_CACHE_IPI)),d2 |
| 68 | call smp_cache_interrupt[],0 |
| 69 | RESTORE_ALL |
| 70 | jmp end |
| 71 | #endif |
| 72 | |
| 73 | ############################################################################### |
| 74 | # |
| 75 | # SMP boot CPU IPI interrupt handler |
| 76 | # |
| 77 | ############################################################################### |
| 78 | mn10300_smp_boot_ipi: |
| 79 | /* clear interrupt */ |
| 80 | movhu (GxICR(SMP_BOOT_IRQ)),d0 |
| 81 | and ~GxICR_REQUEST,d0 |
| 82 | movhu d0,(GxICR(SMP_BOOT_IRQ)) |
| 83 | mov (sp),d0 |
| 84 | add 4,sp |
| 85 | |
| 86 | # get stack |
| 87 | mov (CPUID),a0 |
| 88 | add -1,a0 |
| 89 | add a0,a0 |
| 90 | add a0,a0 |
| 91 | mov (start_stack,a0),a0 |
| 92 | mov a0,sp |
| 93 | jmp initialize_secondary |
| 94 | |
| 95 | |
| 96 | # Jump here after RTI to suppress the icache lookahead |
| 97 | end: |