#define NR_PMB_ENTRIES 16
-static struct kmem_cache *pmb_cache;
-static unsigned long pmb_map;
+static void __pmb_unmap(struct pmb_entry *);
-static struct pmb_entry pmb_init_map[] = {
- /* vpn ppn flags (ub/sz/c/wt) */
-
- /* P1 Section Mappings */
- { 0x80000000, 0x00000000, PMB_SZ_64M | PMB_C, },
- { 0x84000000, 0x04000000, PMB_SZ_64M | PMB_C, },
- { 0x88000000, 0x08000000, PMB_SZ_128M | PMB_C, },
- { 0x90000000, 0x10000000, PMB_SZ_64M | PMB_C, },
- { 0x94000000, 0x14000000, PMB_SZ_64M | PMB_C, },
- { 0x98000000, 0x18000000, PMB_SZ_64M | PMB_C, },
-
- /* P2 Section Mappings */
- { 0xa0000000, 0x00000000, PMB_UB | PMB_SZ_64M | PMB_WT, },
- { 0xa4000000, 0x04000000, PMB_UB | PMB_SZ_64M | PMB_WT, },
- { 0xa8000000, 0x08000000, PMB_UB | PMB_SZ_128M | PMB_WT, },
- { 0xb0000000, 0x10000000, PMB_UB | PMB_SZ_64M | PMB_WT, },
- { 0xb4000000, 0x14000000, PMB_UB | PMB_SZ_64M | PMB_WT, },
- { 0xb8000000, 0x18000000, PMB_UB | PMB_SZ_64M | PMB_WT, },
-};
+static struct pmb_entry pmb_entry_list[NR_PMB_ENTRIES];
+static unsigned long pmb_map;
static inline unsigned long mk_pmb_entry(unsigned int entry)
{
return mk_pmb_entry(entry) | PMB_DATA;
}
-static DEFINE_SPINLOCK(pmb_list_lock);
-static struct pmb_entry *pmb_list;
-
-static inline void pmb_list_add(struct pmb_entry *pmbe)
+static int pmb_alloc_entry(void)
{
- struct pmb_entry **p, *tmp;
+ unsigned int pos;
- p = &pmb_list;
- while ((tmp = *p) != NULL)
- p = &tmp->next;
+repeat:
+ pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
- pmbe->next = tmp;
- *p = pmbe;
-}
+ if (unlikely(pos > NR_PMB_ENTRIES))
+ return -ENOSPC;
-static inline void pmb_list_del(struct pmb_entry *pmbe)
-{
- struct pmb_entry **p, *tmp;
+ if (test_and_set_bit(pos, &pmb_map))
+ goto repeat;
- for (p = &pmb_list; (tmp = *p); p = &tmp->next)
- if (tmp == pmbe) {
- *p = tmp->next;
- return;
- }
+ return pos;
}
-struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
- unsigned long flags)
+static struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
+ unsigned long flags)
{
struct pmb_entry *pmbe;
+ int pos;
+
+ pos = pmb_alloc_entry();
+ if (pos < 0)
+ return ERR_PTR(pos);
- pmbe = kmem_cache_alloc(pmb_cache, GFP_KERNEL);
+ pmbe = &pmb_entry_list[pos];
if (!pmbe)
return ERR_PTR(-ENOMEM);
pmbe->vpn = vpn;
pmbe->ppn = ppn;
pmbe->flags = flags;
-
- spin_lock_irq(&pmb_list_lock);
- pmb_list_add(pmbe);
- spin_unlock_irq(&pmb_list_lock);
+ pmbe->entry = pos;
return pmbe;
}
-void pmb_free(struct pmb_entry *pmbe)
+static void pmb_free(struct pmb_entry *pmbe)
{
- spin_lock_irq(&pmb_list_lock);
- pmb_list_del(pmbe);
- spin_unlock_irq(&pmb_list_lock);
+ int pos = pmbe->entry;
+
+ pmbe->vpn = 0;
+ pmbe->ppn = 0;
+ pmbe->flags = 0;
+ pmbe->entry = 0;
- kmem_cache_free(pmb_cache, pmbe);
+ clear_bit(pos, &pmb_map);
}
/*
* Must be in P2 for __set_pmb_entry()
*/
-int __set_pmb_entry(unsigned long vpn, unsigned long ppn,
- unsigned long flags, int *entry)
+static void __set_pmb_entry(unsigned long vpn, unsigned long ppn,
+ unsigned long flags, int pos)
{
- unsigned int pos = *entry;
-
- if (unlikely(pos == PMB_NO_ENTRY))
- pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
-
-repeat:
- if (unlikely(pos > NR_PMB_ENTRIES))
- return -ENOSPC;
-
- if (test_and_set_bit(pos, &pmb_map)) {
- pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
- goto repeat;
- }
-
ctrl_outl(vpn | PMB_V, mk_pmb_addr(pos));
#ifdef CONFIG_CACHE_WRITETHROUGH
#endif
ctrl_outl(ppn | flags | PMB_V, mk_pmb_data(pos));
-
- *entry = pos;
-
- return 0;
}
-int __uses_jump_to_uncached set_pmb_entry(struct pmb_entry *pmbe)
+static void __uses_jump_to_uncached set_pmb_entry(struct pmb_entry *pmbe)
{
- int ret;
-
jump_to_uncached();
- ret = __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &pmbe->entry);
+ __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, pmbe->entry);
back_to_cached();
-
- return ret;
}
-void __uses_jump_to_uncached clear_pmb_entry(struct pmb_entry *pmbe)
+static void __uses_jump_to_uncached clear_pmb_entry(struct pmb_entry *pmbe)
{
unsigned int entry = pmbe->entry;
unsigned long addr;
- /*
- * Don't allow clearing of wired init entries, P1 or P2 access
- * without a corresponding mapping in the PMB will lead to reset
- * by the TLB.
- */
- if (unlikely(entry < ARRAY_SIZE(pmb_init_map) ||
- entry >= NR_PMB_ENTRIES))
+ if (unlikely(entry >= NR_PMB_ENTRIES))
return;
jump_to_uncached();
ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);
back_to_cached();
-
- clear_bit(entry, &pmb_map);
}
long pmb_remap(unsigned long vaddr, unsigned long phys,
unsigned long size, unsigned long flags)
{
- struct pmb_entry *pmbp;
+ struct pmb_entry *pmbp, *pmbe;
unsigned long wanted;
int pmb_flags, i;
+ long err;
/* Convert typical pgprot value to the PMB equivalent */
if (flags & _PAGE_CACHABLE) {
again:
for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) {
- struct pmb_entry *pmbe;
- int ret;
-
if (size < pmb_sizes[i].size)
continue;
pmbe = pmb_alloc(vaddr, phys, pmb_flags | pmb_sizes[i].flag);
- if (IS_ERR(pmbe))
- return PTR_ERR(pmbe);
-
- ret = set_pmb_entry(pmbe);
- if (ret != 0) {
- pmb_free(pmbe);
- return -EBUSY;
+ if (IS_ERR(pmbe)) {
+ err = PTR_ERR(pmbe);
+ goto out;
}
+ set_pmb_entry(pmbe);
+
phys += pmb_sizes[i].size;
vaddr += pmb_sizes[i].size;
size -= pmb_sizes[i].size;
pmbp->link = pmbe;
pmbp = pmbe;
+
+ /*
+ * Instead of trying smaller sizes on every iteration
+ * (even if we succeed in allocating space), try using
+ * pmb_sizes[i].size again.
+ */
+ i--;
}
if (size >= 0x1000000)
goto again;
return wanted - size;
+
+out:
+ if (pmbp)
+ __pmb_unmap(pmbp);
+
+ return err;
}
void pmb_unmap(unsigned long addr)
{
- struct pmb_entry **p, *pmbe;
+ struct pmb_entry *pmbe = NULL;
+ int i;
- for (p = &pmb_list; (pmbe = *p); p = &pmbe->next)
- if (pmbe->vpn == addr)
- break;
+ for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
+ if (test_bit(i, &pmb_map)) {
+ pmbe = &pmb_entry_list[i];
+ if (pmbe->vpn == addr)
+ break;
+ }
+ }
if (unlikely(!pmbe))
return;
- WARN_ON(!test_bit(pmbe->entry, &pmb_map));
+ __pmb_unmap(pmbe);
+}
+
+static void __pmb_unmap(struct pmb_entry *pmbe)
+{
+ BUG_ON(!test_bit(pmbe->entry, &pmb_map));
do {
struct pmb_entry *pmblink = pmbe;
+ /*
+ * We may be called before this pmb_entry has been
+ * entered into the PMB table via set_pmb_entry(), but
+ * that's OK because we've allocated a unique slot for
+ * this entry in pmb_alloc() (even if we haven't filled
+ * it yet).
+ *
+ * Therefore, calling clear_pmb_entry() is safe as no
+ * other mapping can be using that slot.
+ */
clear_pmb_entry(pmbe);
+
pmbe = pmblink->link;
pmb_free(pmblink);
} while (pmbe);
}
-static void pmb_cache_ctor(void *pmb)
+int __uses_jump_to_uncached pmb_init(void)
{
- struct pmb_entry *pmbe = pmb;
-
- memset(pmb, 0, sizeof(struct pmb_entry));
-
- pmbe->entry = PMB_NO_ENTRY;
-}
-
-static int __uses_jump_to_uncached pmb_init(void)
-{
- unsigned int nr_entries = ARRAY_SIZE(pmb_init_map);
- unsigned int entry, i;
-
- BUG_ON(unlikely(nr_entries >= NR_PMB_ENTRIES));
-
- pmb_cache = kmem_cache_create("pmb", sizeof(struct pmb_entry), 0,
- SLAB_PANIC, pmb_cache_ctor);
+ unsigned int i;
+ long size, ret;
jump_to_uncached();
/*
- * Ordering is important, P2 must be mapped in the PMB before we
- * can set PMB.SE, and P1 must be mapped before we jump back to
- * P1 space.
+ * Insert PMB entries for the P1 and P2 areas so that, after
+ * we've switched the MMU to 32-bit mode, the semantics of P1
+ * and P2 are the same as in 29-bit mode, e.g.
+ *
+ * P1 - provides a cached window onto physical memory
+ * P2 - provides an uncached window onto physical memory
*/
- for (entry = 0; entry < nr_entries; entry++) {
- struct pmb_entry *pmbe = pmb_init_map + entry;
+ size = __MEMORY_START + __MEMORY_SIZE;
- __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &entry);
- }
+ ret = pmb_remap(P1SEG, 0x00000000, size, PMB_C);
+ BUG_ON(ret != size);
+
+ ret = pmb_remap(P2SEG, 0x00000000, size, PMB_WT | PMB_UB);
+ BUG_ON(ret != size);
ctrl_outl(0, PMB_IRMCR);
/* PMB.SE and UB[7] */
- ctrl_outl((1 << 31) | (1 << 7), PMB_PASCR);
+ ctrl_outl(PASCR_SE | (1 << 7), PMB_PASCR);
/* Flush out the TLB */
i = ctrl_inl(MMUCR);
return 0;
}
-arch_initcall(pmb_init);
static int pmb_seq_show(struct seq_file *file, void *iter)
{
static int pmb_sysdev_suspend(struct sys_device *dev, pm_message_t state)
{
static pm_message_t prev_state;
+ int i;
/* Restore the PMB after a resume from hibernation */
if (state.event == PM_EVENT_ON &&
prev_state.event == PM_EVENT_FREEZE) {
struct pmb_entry *pmbe;
- spin_lock_irq(&pmb_list_lock);
- for (pmbe = pmb_list; pmbe; pmbe = pmbe->next)
- set_pmb_entry(pmbe);
- spin_unlock_irq(&pmb_list_lock);
+ for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
+ if (test_bit(i, &pmb_map)) {
+ pmbe = &pmb_entry_list[i];
+ set_pmb_entry(pmbe);
+ }
+ }
}
prev_state = state;
return 0;
git.openpandora.org / pandora-kernel.git / blobdiff