diff options
Diffstat (limited to 'arch/mn10300/kernel/smp-low.S')
-rw-r--r-- | arch/mn10300/kernel/smp-low.S | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/arch/mn10300/kernel/smp-low.S b/arch/mn10300/kernel/smp-low.S new file mode 100644 index 000000000000..72938cefc05e --- /dev/null +++ b/arch/mn10300/kernel/smp-low.S | |||
@@ -0,0 +1,97 @@ | |||
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: | ||