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| author | Guo Ren <guoren@linux.alibaba.com> | 2020-09-07 09:20:18 +0300 |
|---|---|---|
| committer | Guo Ren <guoren@linux.alibaba.com> | 2021-01-12 04:52:40 +0300 |
| commit | 0c8a32eed1625a65798286fb73fea8710a908545 (patch) | |
| tree | 69992b6e217f5e985ebbf1f739b2af336d89138c /arch/csky/mm/fault.c | |
| parent | 7c53f6b671f4aba70ff15e1b05148b10d58c2837 (diff) | |
| download | linux-0c8a32eed1625a65798286fb73fea8710a908545.tar.xz | |
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>
Diffstat (limited to 'arch/csky/mm/fault.c')
| -rw-r--r-- | arch/csky/mm/fault.c | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/arch/csky/mm/fault.c b/arch/csky/mm/fault.c index 081b178b41b1..94eac13b9c97 100644 --- a/arch/csky/mm/fault.c +++ b/arch/csky/mm/fault.c @@ -59,7 +59,6 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write, si_code = SEGV_MAPERR; -#ifndef CONFIG_CPU_HAS_TLBI /* * We fault-in kernel-space virtual memory on-demand. The * 'reference' page table is init_mm.pgd. @@ -84,10 +83,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write, pmd_t *pmd, *pmd_k; pte_t *pte_k; - unsigned long pgd_base; - - pgd_base = (unsigned long)__va(get_pgd()); - pgd = (pgd_t *)pgd_base + offset; + pgd = get_pgd() + offset; pgd_k = init_mm.pgd + offset; if (!pgd_present(*pgd_k)) @@ -110,7 +106,6 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write, goto no_context; return; } -#endif perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); /* |