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6607aa6f |
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27-Feb-2021 |
Guo Ren <guoren@linux.alibaba.com> |
csky: Fixup compile error : error: C++ style comments are not allowed in ISO C90 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. ^ error: (this will be reported only once per input file) Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
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20f69538 |
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23-May-2020 |
Guo Ren <guoren@linux.alibaba.com> |
csky: Coding convention in entry.S There is no fixup or feature in the patch, we only cleanup with: - Remove unnecessary reg used (r11, r12), just use r9 & r10 & syscallid regs as temp useage. - Add _TIF_SYSCALL_WORK and _TIF_WORK_MASK to gather macros. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
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90089759 |
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24-May-2020 |
Guo Ren <guoren@linux.alibaba.com> |
csky: Fixup CONFIG_PREEMPT panic log: [ 0.13373200] Calibrating delay loop... [ 0.14077600] ------------[ cut here ]------------ [ 0.14116700] WARNING: CPU: 0 PID: 0 at kernel/sched/core.c:3790 preempt_count_add+0xc8/0x11c [ 0.14348000] DEBUG_LOCKS_WARN_ON((preempt_count() < 0))Modules linked in: [ 0.14395100] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0 #7 [ 0.14410800] [ 0.14427400] Call Trace: [ 0.14450700] [<807cd226>] dump_stack+0x8a/0xe4 [ 0.14473500] [<80072792>] __warn+0x10e/0x15c [ 0.14495900] [<80072852>] warn_slowpath_fmt+0x72/0xc0 [ 0.14518600] [<800a5240>] preempt_count_add+0xc8/0x11c [ 0.14544900] [<807ef918>] _raw_spin_lock+0x28/0x68 [ 0.14572600] [<800e0eb8>] vprintk_emit+0x84/0x2d8 [ 0.14599000] [<800e113a>] vprintk_default+0x2e/0x44 [ 0.14625100] [<800e2042>] vprintk_func+0x12a/0x1d0 [ 0.14651300] [<800e1804>] printk+0x30/0x48 [ 0.14677600] [<80008052>] lockdep_init+0x12/0xb0 [ 0.14703800] [<80002080>] start_kernel+0x558/0x7f8 [ 0.14730000] [<800052bc>] csky_start+0x58/0x94 [ 0.14756600] irq event stamp: 34 [ 0.14775100] hardirqs last enabled at (33): [<80067370>] ret_from_exception+0x2c/0x72 [ 0.14793700] hardirqs last disabled at (34): [<800e0eae>] vprintk_emit+0x7a/0x2d8 [ 0.14812300] softirqs last enabled at (32): [<800655b0>] __do_softirq+0x578/0x6d8 [ 0.14830800] softirqs last disabled at (25): [<8007b3b8>] irq_exit+0xec/0x128 The preempt_count of reg could be destroyed after csky_do_IRQ without reload from memory. After reference to other architectures (arm64, riscv), we move preempt entry into ret_from_exception and disable irq at the beginning of ret_from_exception instead of RESTORE_ALL. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Reported-by: Lu Baoquan <lu.baoquan@intellif.com>
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165f2d28 |
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21-Apr-2020 |
Liu Yibin <jiulong@linux.alibaba.com> |
csky: Fixup msa highest 3 bits mask Just as comment mentioned, the msa format: cr<30/31, 15> MSA register format: 31 - 29 | 28 - 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 BA Reserved SH WA B SO SEC C D V So we should shift 29 bits not 28 bits for mask Signed-off-by: Liu Yibin <jiulong@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
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aefd9461 |
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28-Mar-2020 |
Guo Ren <guoren@linux.alibaba.com> |
csky: Fixup cpu speculative execution to IO area For the memory size ( > 512MB, < 1GB), the MSA setting is: - SSEG0: PHY_START , PHY_START + 512MB - SSEG1: PHY_START + 512MB, PHY_START + 1GB But the real memory is no more than 1GB, there is a gap between the end size of memory and border of 1GB. CPU could speculatively execute to that gap and if the gap of the bus couldn't respond to the CPU request, then the crash will happen. Now make the setting with: - SSEG0: PHY_START , PHY_START + 512MB (no change) - SSEG1: Disabled (We use highmem to use the memory of 512MB~1GB) We also deprecated zhole_szie[] settings, it's only used by arm style CPUs. All memory gap should use Reserved setting of dts in csky system. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
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f8e17c17 |
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16-Dec-2019 |
Guo Ren <guoren@linux.alibaba.com> |
csky: Set regs->usp to kernel sp, when the exception is from kernel In the past, we didn't care about kernel sp when saving pt_reg. But in some cases, we still need pt_reg->usp to represent the kernel stack before enter exception. For cmpxhg in atomic.S, we need save and restore usp for above. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
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205353fa |
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12-Apr-2019 |
Guo Ren <ren_guo@c-sky.com> |
csky: Support vmlinux bootup with MMU off Modify SETUP_MMU macro to fit on both MMU-on or MMU-off enviornment and vmlinux could bootup from MMU off enviornment for some cases. Unify the style of _start and _start_smp_secondary in head.S to make head.S looks more concise and easy to understand. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de>
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f62e3162 |
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07-Apr-2019 |
Guo Ren <ren_guo@c-sky.com> |
csky: Support dynamic start physical address Before this patch csky-linux need CONFIG_RAM_BASE to determine start physical address. Now we use phys_offset variable to replace the macro of PHYS_OFFSET and we setup phys_offset with real physical address which is determined during startup in head.S. With this patch we needn't re-compile kernel for different start physical address. ie: 0x0 / 0xc0000000 start physical address could use the same vmlinux, be care different start address must be 512MB aligned. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de>
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bf241682 |
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01-Apr-2019 |
Guo Ren <ren_guo@c-sky.com> |
csky: Reconstruct signal processing Linux kernel has provided some apis for arch signal's implementation. For example: restore_saved_sigmask() set_current_blocked() restore_altstack() But in last version of csky signal.c didn't use them and some codes are confusing, so reconstruct signal.c with reference to riscv's code. Now csky signal.c implementation are very close to riscv and we can get the following benefits: - Clear code structure - The signal code of riscv and csky can be reviewed together - Promoting the unification of arch's signal implementation Also modified the related code in entry.S Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de>
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2f7932b0 |
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20-Mar-2019 |
Guo Ren <ren_guo@c-sky.com> |
csky: Update syscall_trace_enter/exit implementation Previous syscall_trace implementation couldn't support AUDITSYSCALL and SYSCALL_TRACEPOINTS. Now we redesign it to support audit_syscall and syscall_tracepoints just like other archs'. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Dmitry V. Levin <ldv@altlinux.org> Cc: Arnd Bergmann <arnd@arndb.de>
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081860b9 |
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05-Sep-2018 |
Guo Ren <ren_guo@c-sky.com> |
csky: Exception handling and mm-fault This patch adds exception handling code, cpuinfo and mm-fault code. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
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