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Diffstat (limited to 'arch/mips/mm/tlbex.c')
-rw-r--r--arch/mips/mm/tlbex.c123
1 files changed, 81 insertions, 42 deletions
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index 03eb0ef9158..2833dcb67b5 100644
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -148,8 +148,8 @@ enum label_id {
label_leave,
label_vmalloc,
label_vmalloc_done,
- label_tlbw_hazard,
- label_split,
+ label_tlbw_hazard_0,
+ label_split = label_tlbw_hazard_0 + 8,
label_tlbl_goaround1,
label_tlbl_goaround2,
label_nopage_tlbl,
@@ -167,7 +167,7 @@ UASM_L_LA(_second_part)
UASM_L_LA(_leave)
UASM_L_LA(_vmalloc)
UASM_L_LA(_vmalloc_done)
-UASM_L_LA(_tlbw_hazard)
+/* _tlbw_hazard_x is handled differently. */
UASM_L_LA(_split)
UASM_L_LA(_tlbl_goaround1)
UASM_L_LA(_tlbl_goaround2)
@@ -181,6 +181,30 @@ UASM_L_LA(_large_segbits_fault)
UASM_L_LA(_tlb_huge_update)
#endif
+static int __cpuinitdata hazard_instance;
+
+static void uasm_bgezl_hazard(u32 **p, struct uasm_reloc **r, int instance)
+{
+ switch (instance) {
+ case 0 ... 7:
+ uasm_il_bgezl(p, r, 0, label_tlbw_hazard_0 + instance);
+ return;
+ default:
+ BUG();
+ }
+}
+
+static void uasm_bgezl_label(struct uasm_label **l, u32 **p, int instance)
+{
+ switch (instance) {
+ case 0 ... 7:
+ uasm_build_label(l, *p, label_tlbw_hazard_0 + instance);
+ break;
+ default:
+ BUG();
+ }
+}
+
/*
* For debug purposes.
*/
@@ -449,8 +473,20 @@ static void __cpuinit build_tlb_write_entry(u32 **p, struct uasm_label **l,
}
if (cpu_has_mips_r2) {
- if (cpu_has_mips_r2_exec_hazard)
+ /*
+ * The architecture spec says an ehb is required here,
+ * but a number of cores do not have the hazard and
+ * using an ehb causes an expensive pipeline stall.
+ */
+ switch (current_cpu_type()) {
+ case CPU_M14KC:
+ case CPU_74K:
+ break;
+
+ default:
uasm_i_ehb(p);
+ break;
+ }
tlbw(p);
return;
}
@@ -466,21 +502,28 @@ static void __cpuinit build_tlb_write_entry(u32 **p, struct uasm_label **l,
* This branch uses up a mtc0 hazard nop slot and saves
* two nops after the tlbw instruction.
*/
- uasm_il_bgezl(p, r, 0, label_tlbw_hazard);
+ uasm_bgezl_hazard(p, r, hazard_instance);
tlbw(p);
- uasm_l_tlbw_hazard(l, *p);
+ uasm_bgezl_label(l, p, hazard_instance);
+ hazard_instance++;
uasm_i_nop(p);
break;
case CPU_R4600:
case CPU_R4700:
- case CPU_R5000:
- case CPU_R5000A:
uasm_i_nop(p);
tlbw(p);
uasm_i_nop(p);
break;
+ case CPU_R5000:
+ case CPU_R5000A:
+ case CPU_NEVADA:
+ uasm_i_nop(p); /* QED specifies 2 nops hazard */
+ uasm_i_nop(p); /* QED specifies 2 nops hazard */
+ tlbw(p);
+ break;
+
case CPU_R4300:
case CPU_5KC:
case CPU_TX49XX:
@@ -514,17 +557,6 @@ static void __cpuinit build_tlb_write_entry(u32 **p, struct uasm_label **l,
tlbw(p);
break;
- case CPU_NEVADA:
- uasm_i_nop(p); /* QED specifies 2 nops hazard */
- /*
- * This branch uses up a mtc0 hazard nop slot and saves
- * a nop after the tlbw instruction.
- */
- uasm_il_bgezl(p, r, 0, label_tlbw_hazard);
- tlbw(p);
- uasm_l_tlbw_hazard(l, *p);
- break;
-
case CPU_RM7000:
uasm_i_nop(p);
uasm_i_nop(p);
@@ -586,9 +618,8 @@ static void __cpuinit build_tlb_write_entry(u32 **p, struct uasm_label **l,
static __cpuinit __maybe_unused void build_convert_pte_to_entrylo(u32 **p,
unsigned int reg)
{
- if (kernel_uses_smartmips_rixi) {
- UASM_i_SRL(p, reg, reg, ilog2(_PAGE_NO_EXEC));
- UASM_i_ROTR(p, reg, reg, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC));
+ if (cpu_has_rixi) {
+ UASM_i_ROTR(p, reg, reg, ilog2(_PAGE_GLOBAL));
} else {
#ifdef CONFIG_64BIT_PHYS_ADDR
uasm_i_dsrl_safe(p, reg, reg, ilog2(_PAGE_GLOBAL));
@@ -921,6 +952,13 @@ build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr)
#endif
uasm_i_mfc0(p, tmp, C0_BADVADDR); /* get faulting address */
uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr);
+
+ if (cpu_has_mips_r2) {
+ uasm_i_ext(p, tmp, tmp, PGDIR_SHIFT, (32 - PGDIR_SHIFT));
+ uasm_i_ins(p, ptr, tmp, PGD_T_LOG2, (32 - PGDIR_SHIFT));
+ return;
+ }
+
uasm_i_srl(p, tmp, tmp, PGDIR_SHIFT); /* get pgd only bits */
uasm_i_sll(p, tmp, tmp, PGD_T_LOG2);
uasm_i_addu(p, ptr, ptr, tmp); /* add in pgd offset */
@@ -956,6 +994,15 @@ static void __cpuinit build_adjust_context(u32 **p, unsigned int ctx)
static void __cpuinit build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr)
{
+ if (cpu_has_mips_r2) {
+ /* PTE ptr offset is obtained from BadVAddr */
+ UASM_i_MFC0(p, tmp, C0_BADVADDR);
+ UASM_i_LW(p, ptr, 0, ptr);
+ uasm_i_ext(p, tmp, tmp, PAGE_SHIFT+1, PGDIR_SHIFT-PAGE_SHIFT-1);
+ uasm_i_ins(p, ptr, tmp, PTE_T_LOG2+1, PGDIR_SHIFT-PAGE_SHIFT-1);
+ return;
+ }
+
/*
* Bug workaround for the Nevada. It seems as if under certain
* circumstances the move from cp0_context might produce a
@@ -990,12 +1037,10 @@ static void __cpuinit build_update_entries(u32 **p, unsigned int tmp,
if (cpu_has_64bits) {
uasm_i_ld(p, tmp, 0, ptep); /* get even pte */
uasm_i_ld(p, ptep, sizeof(pte_t), ptep); /* get odd pte */
- if (kernel_uses_smartmips_rixi) {
- UASM_i_SRL(p, tmp, tmp, ilog2(_PAGE_NO_EXEC));
- UASM_i_SRL(p, ptep, ptep, ilog2(_PAGE_NO_EXEC));
- UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC));
+ if (cpu_has_rixi) {
+ UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL));
UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
- UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC));
+ UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL));
} else {
uasm_i_dsrl_safe(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); /* convert to entrylo0 */
UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
@@ -1017,14 +1062,12 @@ static void __cpuinit build_update_entries(u32 **p, unsigned int tmp,
UASM_i_LW(p, ptep, sizeof(pte_t), ptep); /* get odd pte */
if (r45k_bvahwbug())
build_tlb_probe_entry(p);
- if (kernel_uses_smartmips_rixi) {
- UASM_i_SRL(p, tmp, tmp, ilog2(_PAGE_NO_EXEC));
- UASM_i_SRL(p, ptep, ptep, ilog2(_PAGE_NO_EXEC));
- UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC));
+ if (cpu_has_rixi) {
+ UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL));
if (r4k_250MHZhwbug())
UASM_i_MTC0(p, 0, C0_ENTRYLO0);
UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
- UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC));
+ UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL));
} else {
UASM_i_SRL(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); /* convert to entrylo0 */
if (r4k_250MHZhwbug())
@@ -1183,14 +1226,10 @@ build_fast_tlb_refill_handler (u32 **p, struct uasm_label **l,
UASM_i_LW(p, even, 0, ptr); /* get even pte */
UASM_i_LW(p, odd, sizeof(pte_t), ptr); /* get odd pte */
}
- if (kernel_uses_smartmips_rixi) {
- uasm_i_dsrl_safe(p, even, even, ilog2(_PAGE_NO_EXEC));
- uasm_i_dsrl_safe(p, odd, odd, ilog2(_PAGE_NO_EXEC));
- uasm_i_drotr(p, even, even,
- ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC));
+ if (cpu_has_rixi) {
+ uasm_i_drotr(p, even, even, ilog2(_PAGE_GLOBAL));
UASM_i_MTC0(p, even, C0_ENTRYLO0); /* load it */
- uasm_i_drotr(p, odd, odd,
- ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC));
+ uasm_i_drotr(p, odd, odd, ilog2(_PAGE_GLOBAL));
} else {
uasm_i_dsrl_safe(p, even, even, ilog2(_PAGE_GLOBAL));
UASM_i_MTC0(p, even, C0_ENTRYLO0); /* load it */
@@ -1545,7 +1584,7 @@ build_pte_present(u32 **p, struct uasm_reloc **r,
{
int t = scratch >= 0 ? scratch : pte;
- if (kernel_uses_smartmips_rixi) {
+ if (cpu_has_rixi) {
if (use_bbit_insns()) {
uasm_il_bbit0(p, r, pte, ilog2(_PAGE_PRESENT), lid);
uasm_i_nop(p);
@@ -1875,7 +1914,7 @@ static void __cpuinit build_r4000_tlb_load_handler(void)
if (m4kc_tlbp_war())
build_tlb_probe_entry(&p);
- if (kernel_uses_smartmips_rixi) {
+ if (cpu_has_rixi) {
/*
* If the page is not _PAGE_VALID, RI or XI could not
* have triggered it. Skip the expensive test..
@@ -1929,7 +1968,7 @@ static void __cpuinit build_r4000_tlb_load_handler(void)
build_pte_present(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbl);
build_tlb_probe_entry(&p);
- if (kernel_uses_smartmips_rixi) {
+ if (cpu_has_rixi) {
/*
* If the page is not _PAGE_VALID, RI or XI could not
* have triggered it. Skip the expensive test..
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-01-03 13:06:20 +0000