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b0ae5e26 |
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23-Dec-2020 |
Guo Ren <guoren@linux.alibaba.com> |
csky: Remove prologue of page fault handler in entry.S There is a prologue on page fault handler which marking pages dirty and/or accessed in page attributes, but all of these have been handled in handle_pte_fault. - Add flush_tlb_one in vmalloc page fault instead of prologue. - Using cmxchg_fixup C codes in do_page_fault instead of ASM one. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
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0c8a32ee |
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07-Sep-2020 |
Guo Ren <guoren@linux.alibaba.com> |
csky: Add memory layout 2.5G(user):1.5G(kernel) There are two ways for translating va to pa for csky: - Use TLB(Translate Lookup Buffer) and PTW (Page Table Walk) - Use SSEG0/1 (Simple Segment Mapping) We use tlb mapping 0-2G and 3G-4G virtual address area and SSEG0/1 are for 2G-2.5G and 2.5G-3G translation. We could disable SSEG0 to use 2G-2.5G as TLB user mapping. 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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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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a0ae6280 |
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05-Sep-2018 |
Guo Ren <ren_guo@c-sky.com> |
csky: Atomic operations This patch adds atomic, cmpxchg, spinlock files. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Andrea Parri <andrea.parri@amarulasolutions.com> Cc: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Peter Zijlstra <peterz@infradead.org>
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