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MIPS: mm: Simplify build_update_entries 

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>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13123/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton 2016-04-19 09:25:09 +01:00 committed by Ralf Baechle
parent b4ebbb876d
commit 2caa89b49b
1 changed files with 16 additions and 21 deletions
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37
arch/mips/mm/tlbex.c
View File

@ -631,6 +631,11 @@ 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));
@ -1011,10 +1016,16 @@ 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);
@ -1033,24 +1044,8 @@ 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);