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-rw-r--r--arch/avr32/mm/tlb.c175
1 files changed, 87 insertions, 88 deletions
diff --git a/arch/avr32/mm/tlb.c b/arch/avr32/mm/tlb.c
index cd12edb..06677be 100644
--- a/arch/avr32/mm/tlb.c
+++ b/arch/avr32/mm/tlb.c
@@ -11,21 +11,21 @@
#include <asm/mmu_context.h>
-#define _TLBEHI_I 0x100
+/* TODO: Get the correct number from the CONFIG1 system register */
+#define NR_TLB_ENTRIES 32
-void show_dtlb_entry(unsigned int index)
+static void show_dtlb_entry(unsigned int index)
{
- unsigned int tlbehi, tlbehi_save, tlbelo, mmucr, mmucr_save;
+ u32 tlbehi, tlbehi_save, tlbelo, mmucr, mmucr_save;
unsigned long flags;
local_irq_save(flags);
mmucr_save = sysreg_read(MMUCR);
tlbehi_save = sysreg_read(TLBEHI);
- mmucr = mmucr_save & 0x13;
- mmucr |= index << 14;
+ mmucr = SYSREG_BFINS(DRP, index, mmucr_save);
sysreg_write(MMUCR, mmucr);
- asm volatile("tlbr" : : : "memory");
+ __builtin_tlbr();
cpu_sync_pipeline();
tlbehi = sysreg_read(TLBEHI);
@@ -33,15 +33,17 @@ void show_dtlb_entry(unsigned int index)
printk("%2u: %c %c %02x %05x %05x %o %o %c %c %c %c\n",
index,
- (tlbehi & 0x200)?'1':'0',
- (tlbelo & 0x100)?'1':'0',
- (tlbehi & 0xff),
- (tlbehi >> 12), (tlbelo >> 12),
- (tlbelo >> 4) & 7, (tlbelo >> 2) & 3,
- (tlbelo & 0x200)?'1':'0',
- (tlbelo & 0x080)?'1':'0',
- (tlbelo & 0x001)?'1':'0',
- (tlbelo & 0x002)?'1':'0');
+ SYSREG_BFEXT(TLBEHI_V, tlbehi) ? '1' : '0',
+ SYSREG_BFEXT(G, tlbelo) ? '1' : '0',
+ SYSREG_BFEXT(ASID, tlbehi),
+ SYSREG_BFEXT(VPN, tlbehi) >> 2,
+ SYSREG_BFEXT(PFN, tlbelo) >> 2,
+ SYSREG_BFEXT(AP, tlbelo),
+ SYSREG_BFEXT(SZ, tlbelo),
+ SYSREG_BFEXT(TLBELO_C, tlbelo) ? 'C' : ' ',
+ SYSREG_BFEXT(B, tlbelo) ? 'B' : ' ',
+ SYSREG_BFEXT(W, tlbelo) ? 'W' : ' ',
+ SYSREG_BFEXT(TLBELO_D, tlbelo) ? 'D' : ' ');
sysreg_write(MMUCR, mmucr_save);
sysreg_write(TLBEHI, tlbehi_save);
@@ -54,29 +56,33 @@ void dump_dtlb(void)
unsigned int i;
printk("ID V G ASID VPN PFN AP SZ C B W D\n");
- for (i = 0; i < 32; i++)
+ for (i = 0; i < NR_TLB_ENTRIES; i++)
show_dtlb_entry(i);
}
-static unsigned long last_mmucr;
-
-static inline void set_replacement_pointer(unsigned shift)
+static void update_dtlb(unsigned long address, pte_t pte)
{
- unsigned long mmucr, mmucr_save;
+ u32 tlbehi;
+ u32 mmucr;
- mmucr = mmucr_save = sysreg_read(MMUCR);
+ /*
+ * We're not changing the ASID here, so no need to flush the
+ * pipeline.
+ */
+ tlbehi = sysreg_read(TLBEHI);
+ tlbehi = SYSREG_BF(ASID, SYSREG_BFEXT(ASID, tlbehi));
+ tlbehi |= address & MMU_VPN_MASK;
+ tlbehi |= SYSREG_BIT(TLBEHI_V);
+ sysreg_write(TLBEHI, tlbehi);
/* Does this mapping already exist? */
- __asm__ __volatile__(
- " tlbs\n"
- " mfsr %0, %1"
- : "=r"(mmucr)
- : "i"(SYSREG_MMUCR));
+ __builtin_tlbs();
+ mmucr = sysreg_read(MMUCR);
if (mmucr & SYSREG_BIT(MMUCR_N)) {
/* Not found -- pick a not-recently-accessed entry */
- unsigned long rp;
- unsigned long tlbar = sysreg_read(TLBARLO);
+ unsigned int rp;
+ u32 tlbar = sysreg_read(TLBARLO);
rp = 32 - fls(tlbar);
if (rp == 32) {
@@ -84,30 +90,14 @@ static inline void set_replacement_pointer(unsigned shift)
sysreg_write(TLBARLO, -1L);
}
- mmucr &= 0x13;
- mmucr |= (rp << shift);
-
+ mmucr = SYSREG_BFINS(DRP, rp, mmucr);
sysreg_write(MMUCR, mmucr);
}
- last_mmucr = mmucr;
-}
-
-static void update_dtlb(unsigned long address, pte_t pte, unsigned long asid)
-{
- unsigned long vpn;
-
- vpn = (address & MMU_VPN_MASK) | _TLBEHI_VALID | asid;
- sysreg_write(TLBEHI, vpn);
- cpu_sync_pipeline();
-
- set_replacement_pointer(14);
-
sysreg_write(TLBELO, pte_val(pte) & _PAGE_FLAGS_HARDWARE_MASK);
/* Let's go */
- asm volatile("nop\n\ttlbw" : : : "memory");
- cpu_sync_pipeline();
+ __builtin_tlbw();
}
void update_mmu_cache(struct vm_area_struct *vma,
@@ -120,39 +110,40 @@ void update_mmu_cache(struct vm_area_struct *vma,
return;
local_irq_save(flags);
- update_dtlb(address, pte, get_asid());
+ update_dtlb(address, pte);
local_irq_restore(flags);
}
-void __flush_tlb_page(unsigned long asid, unsigned long page)
+static void __flush_tlb_page(unsigned long asid, unsigned long page)
{
- unsigned long mmucr, tlbehi;
+ u32 mmucr, tlbehi;
- page |= asid;
- sysreg_write(TLBEHI, page);
- cpu_sync_pipeline();
- asm volatile("tlbs");
+ /*
+ * Caller is responsible for masking out non-PFN bits in page
+ * and changing the current ASID if necessary. This means that
+ * we don't need to flush the pipeline after writing TLBEHI.
+ */
+ tlbehi = page | asid;
+ sysreg_write(TLBEHI, tlbehi);
+
+ __builtin_tlbs();
mmucr = sysreg_read(MMUCR);
if (!(mmucr & SYSREG_BIT(MMUCR_N))) {
- unsigned long tlbarlo;
- unsigned long entry;
+ unsigned int entry;
+ u32 tlbarlo;
/* Clear the "valid" bit */
- tlbehi = sysreg_read(TLBEHI);
- tlbehi &= ~_TLBEHI_VALID;
sysreg_write(TLBEHI, tlbehi);
- cpu_sync_pipeline();
/* mark the entry as "not accessed" */
- entry = (mmucr >> 14) & 0x3f;
+ entry = SYSREG_BFEXT(DRP, mmucr);
tlbarlo = sysreg_read(TLBARLO);
- tlbarlo |= (0x80000000 >> entry);
+ tlbarlo |= (0x80000000UL >> entry);
sysreg_write(TLBARLO, tlbarlo);
/* update the entry with valid bit clear */
- asm volatile("tlbw");
- cpu_sync_pipeline();
+ __builtin_tlbw();
}
}
@@ -190,17 +181,22 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
local_irq_save(flags);
size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
+
if (size > (MMU_DTLB_ENTRIES / 4)) { /* Too many entries to flush */
mm->context = NO_CONTEXT;
if (mm == current->mm)
activate_context(mm);
} else {
- unsigned long asid = mm->context & MMU_CONTEXT_ASID_MASK;
- unsigned long saved_asid = MMU_NO_ASID;
+ unsigned long asid;
+ unsigned long saved_asid;
+
+ asid = mm->context & MMU_CONTEXT_ASID_MASK;
+ saved_asid = MMU_NO_ASID;
start &= PAGE_MASK;
end += (PAGE_SIZE - 1);
end &= PAGE_MASK;
+
if (mm != current->mm) {
saved_asid = get_asid();
set_asid(asid);
@@ -218,33 +214,34 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
}
/*
- * TODO: If this is only called for addresses > TASK_SIZE, we can probably
- * skip the ASID stuff and just use the Global bit...
+ * This function depends on the pages to be flushed having the G
+ * (global) bit set in their pte. This is true for all
+ * PAGE_KERNEL(_RO) pages.
*/
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
unsigned long flags;
int size;
- local_irq_save(flags);
size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
if (size > (MMU_DTLB_ENTRIES / 4)) { /* Too many entries to flush */
flush_tlb_all();
} else {
- unsigned long asid = init_mm.context & MMU_CONTEXT_ASID_MASK;
- unsigned long saved_asid = get_asid();
+ unsigned long asid;
+
+ local_irq_save(flags);
+ asid = get_asid();
start &= PAGE_MASK;
end += (PAGE_SIZE - 1);
end &= PAGE_MASK;
- set_asid(asid);
+
while (start < end) {
__flush_tlb_page(asid, start);
start += PAGE_SIZE;
}
- set_asid(saved_asid);
+ local_irq_restore(flags);
}
- local_irq_restore(flags);
}
void flush_tlb_mm(struct mm_struct *mm)
@@ -280,7 +277,7 @@ static void *tlb_start(struct seq_file *tlb, loff_t *pos)
{
static unsigned long tlb_index;
- if (*pos >= 32)
+ if (*pos >= NR_TLB_ENTRIES)
return NULL;
tlb_index = 0;
@@ -291,7 +288,7 @@ static void *tlb_next(struct seq_file *tlb, void *v, loff_t *pos)
{
unsigned long *index = v;
- if (*index >= 31)
+ if (*index >= NR_TLB_ENTRIES - 1)
return NULL;
++*pos;
@@ -313,16 +310,16 @@ static int tlb_show(struct seq_file *tlb, void *v)
if (*index == 0)
seq_puts(tlb, "ID V G ASID VPN PFN AP SZ C B W D\n");
- BUG_ON(*index >= 32);
+ BUG_ON(*index >= NR_TLB_ENTRIES);
local_irq_save(flags);
mmucr_save = sysreg_read(MMUCR);
tlbehi_save = sysreg_read(TLBEHI);
- mmucr = mmucr_save & 0x13;
- mmucr |= *index << 14;
+ mmucr = SYSREG_BFINS(DRP, *index, mmucr_save);
sysreg_write(MMUCR, mmucr);
- asm volatile("tlbr" : : : "memory");
+ /* TLBR might change the ASID */
+ __builtin_tlbr();
cpu_sync_pipeline();
tlbehi = sysreg_read(TLBEHI);
@@ -334,16 +331,18 @@ static int tlb_show(struct seq_file *tlb, void *v)
local_irq_restore(flags);
seq_printf(tlb, "%2lu: %c %c %02x %05x %05x %o %o %c %c %c %c\n",
- *index,
- (tlbehi & 0x200)?'1':'0',
- (tlbelo & 0x100)?'1':'0',
- (tlbehi & 0xff),
- (tlbehi >> 12), (tlbelo >> 12),
- (tlbelo >> 4) & 7, (tlbelo >> 2) & 3,
- (tlbelo & 0x200)?'1':'0',
- (tlbelo & 0x080)?'1':'0',
- (tlbelo & 0x001)?'1':'0',
- (tlbelo & 0x002)?'1':'0');
+ *index,
+ SYSREG_BFEXT(TLBEHI_V, tlbehi) ? '1' : '0',
+ SYSREG_BFEXT(G, tlbelo) ? '1' : '0',
+ SYSREG_BFEXT(ASID, tlbehi),
+ SYSREG_BFEXT(VPN, tlbehi) >> 2,
+ SYSREG_BFEXT(PFN, tlbelo) >> 2,
+ SYSREG_BFEXT(AP, tlbelo),
+ SYSREG_BFEXT(SZ, tlbelo),
+ SYSREG_BFEXT(TLBELO_C, tlbelo) ? '1' : '0',
+ SYSREG_BFEXT(B, tlbelo) ? '1' : '0',
+ SYSREG_BFEXT(W, tlbelo) ? '1' : '0',
+ SYSREG_BFEXT(TLBELO_D, tlbelo) ? '1' : '0');
return 0;
}
generated by cgit v0.10.2 at 2024-11-19 15:31:33 (GMT)