Messages in this thread Patch in this message | | | From | Paul Burton <> | Subject | [PATCH v3 11/13] MIPS: mm: Simplify build_update_entries | Date | Tue, 19 Apr 2016 09:25:09 +0100 |
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We can simplify build_update_entries by unifying the code for the 36 bit physical addressing with MIPS32 case with the general case, by using pte_off_ variables in all cases & handling the trivial _PAGE_GLOBAL_SHIFT == 0 case in build_convert_pte_to_entrylo. This leaves XPA as the only special case.
Signed-off-by: Paul Burton <paul.burton@imgtec.com> Reviewed-by: James Hogan <james.hogan@imgtec.com>
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Changes in v3: None Changes in v2: - #ifdef on CONFIG_CPU_MIPS32 instead of config_enabled(CONFIG_32BIT) to avoid referencing pte_high in configurations where it doesn't exist.
arch/mips/mm/tlbex.c | 37 ++++++++++++++++--------------------- 1 file changed, 16 insertions(+), 21 deletions(-)
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c index 0bd3755..c7c14bd 100644 --- a/arch/mips/mm/tlbex.c +++ b/arch/mips/mm/tlbex.c @@ -626,6 +626,11 @@ static void build_tlb_write_entry(u32 **p, struct uasm_label **l, static __maybe_unused void build_convert_pte_to_entrylo(u32 **p, unsigned int reg) { + if (_PAGE_GLOBAL_SHIFT == 0) { + /* pte_t is already in EntryLo format */ + return; + } + if (cpu_has_rixi && _PAGE_NO_EXEC) { if (fill_includes_sw_bits) { UASM_i_ROTR(p, reg, reg, ilog2(_PAGE_GLOBAL)); @@ -1003,10 +1008,16 @@ static void build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr) static void build_update_entries(u32 **p, unsigned int tmp, unsigned int ptep) { - if (config_enabled(CONFIG_XPA)) { - int pte_off_even = sizeof(pte_t) / 2; - int pte_off_odd = pte_off_even + sizeof(pte_t); + int pte_off_even = 0; + int pte_off_odd = sizeof(pte_t); +#if defined(CONFIG_CPU_MIPS32) && defined(CONFIG_PHYS_ADDR_T_64BIT) + /* The low 32 bits of EntryLo is stored in pte_high */ + pte_off_even += offsetof(pte_t, pte_high); + pte_off_odd += offsetof(pte_t, pte_high); +#endif + + if (config_enabled(CONFIG_XPA)) { uasm_i_lw(p, tmp, pte_off_even, ptep); /* even pte */ UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); UASM_i_MTC0(p, tmp, C0_ENTRYLO0); @@ -1025,24 +1036,8 @@ static void build_update_entries(u32 **p, unsigned int tmp, unsigned int ptep) return; } - /* - * 64bit address support (36bit on a 32bit CPU) in a 32bit - * Kernel is a special case. Only a few CPUs use it. - */ - if (config_enabled(CONFIG_PHYS_ADDR_T_64BIT) && !cpu_has_64bits) { - int pte_off_even = sizeof(pte_t) / 2; - int pte_off_odd = pte_off_even + sizeof(pte_t); - - uasm_i_lw(p, tmp, pte_off_even, ptep); /* even pte */ - UASM_i_MTC0(p, tmp, C0_ENTRYLO0); - - uasm_i_lw(p, ptep, pte_off_odd, ptep); /* odd pte */ - UASM_i_MTC0(p, ptep, C0_ENTRYLO1); - return; - } - - UASM_i_LW(p, tmp, 0, ptep); /* get even pte */ - UASM_i_LW(p, ptep, sizeof(pte_t), ptep); /* get odd pte */ + UASM_i_LW(p, tmp, pte_off_even, ptep); /* get even pte */ + UASM_i_LW(p, ptep, pte_off_odd, ptep); /* get odd pte */ if (r45k_bvahwbug()) build_tlb_probe_entry(p); build_convert_pte_to_entrylo(p, tmp); -- 2.8.0
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