![Paul Mundt](/assets/img/avatar_default.png)
These ended up causing too many problems on older parts, revert for now.. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
770 lines
20 KiB
C
770 lines
20 KiB
C
/*
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* arch/sh/mm/cache-sh4.c
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*
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* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
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* Copyright (C) 2001 - 2006 Paul Mundt
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* Copyright (C) 2003 Richard Curnow
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/io.h>
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#include <linux/mutex.h>
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#include <asm/mmu_context.h>
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#include <asm/cacheflush.h>
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/*
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* The maximum number of pages we support up to when doing ranged dcache
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* flushing. Anything exceeding this will simply flush the dcache in its
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* entirety.
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*/
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#define MAX_DCACHE_PAGES 64 /* XXX: Tune for ways */
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static void __flush_dcache_segment_1way(unsigned long start,
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unsigned long extent);
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static void __flush_dcache_segment_2way(unsigned long start,
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unsigned long extent);
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static void __flush_dcache_segment_4way(unsigned long start,
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unsigned long extent);
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static void __flush_cache_4096(unsigned long addr, unsigned long phys,
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unsigned long exec_offset);
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/*
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* This is initialised here to ensure that it is not placed in the BSS. If
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* that were to happen, note that cache_init gets called before the BSS is
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* cleared, so this would get nulled out which would be hopeless.
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*/
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static void (*__flush_dcache_segment_fn)(unsigned long, unsigned long) =
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(void (*)(unsigned long, unsigned long))0xdeadbeef;
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static void compute_alias(struct cache_info *c)
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{
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c->alias_mask = ((c->sets - 1) << c->entry_shift) & ~(PAGE_SIZE - 1);
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c->n_aliases = (c->alias_mask >> PAGE_SHIFT) + 1;
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}
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static void __init emit_cache_params(void)
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{
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printk("PVR=%08x CVR=%08x PRR=%08x\n",
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ctrl_inl(CCN_PVR),
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ctrl_inl(CCN_CVR),
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ctrl_inl(CCN_PRR));
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printk("I-cache : n_ways=%d n_sets=%d way_incr=%d\n",
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current_cpu_data.icache.ways,
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current_cpu_data.icache.sets,
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current_cpu_data.icache.way_incr);
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printk("I-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
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current_cpu_data.icache.entry_mask,
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current_cpu_data.icache.alias_mask,
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current_cpu_data.icache.n_aliases);
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printk("D-cache : n_ways=%d n_sets=%d way_incr=%d\n",
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current_cpu_data.dcache.ways,
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current_cpu_data.dcache.sets,
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current_cpu_data.dcache.way_incr);
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printk("D-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
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current_cpu_data.dcache.entry_mask,
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current_cpu_data.dcache.alias_mask,
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current_cpu_data.dcache.n_aliases);
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if (!__flush_dcache_segment_fn)
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panic("unknown number of cache ways\n");
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}
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/*
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* SH-4 has virtually indexed and physically tagged cache.
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*/
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/* Worst case assumed to be 64k cache, direct-mapped i.e. 4 synonym bits. */
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#define MAX_P3_MUTEXES 16
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struct mutex p3map_mutex[MAX_P3_MUTEXES];
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void __init p3_cache_init(void)
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{
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int i;
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compute_alias(¤t_cpu_data.icache);
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compute_alias(¤t_cpu_data.dcache);
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switch (current_cpu_data.dcache.ways) {
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case 1:
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__flush_dcache_segment_fn = __flush_dcache_segment_1way;
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break;
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case 2:
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__flush_dcache_segment_fn = __flush_dcache_segment_2way;
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break;
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case 4:
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__flush_dcache_segment_fn = __flush_dcache_segment_4way;
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break;
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default:
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__flush_dcache_segment_fn = NULL;
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break;
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}
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emit_cache_params();
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if (ioremap_page_range(P3SEG, P3SEG + (PAGE_SIZE * 4), 0, PAGE_KERNEL))
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panic("%s failed.", __FUNCTION__);
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for (i = 0; i < current_cpu_data.dcache.n_aliases; i++)
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mutex_init(&p3map_mutex[i]);
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}
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/*
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* Write back the dirty D-caches, but not invalidate them.
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*
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* START: Virtual Address (U0, P1, or P3)
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* SIZE: Size of the region.
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*/
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void __flush_wback_region(void *start, int size)
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{
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unsigned long v;
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unsigned long begin, end;
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begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
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end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
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& ~(L1_CACHE_BYTES-1);
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for (v = begin; v < end; v+=L1_CACHE_BYTES) {
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asm volatile("ocbwb %0"
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: /* no output */
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: "m" (__m(v)));
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}
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}
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/*
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* Write back the dirty D-caches and invalidate them.
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*
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* START: Virtual Address (U0, P1, or P3)
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* SIZE: Size of the region.
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*/
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void __flush_purge_region(void *start, int size)
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{
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unsigned long v;
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unsigned long begin, end;
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begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
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end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
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& ~(L1_CACHE_BYTES-1);
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for (v = begin; v < end; v+=L1_CACHE_BYTES) {
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asm volatile("ocbp %0"
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: /* no output */
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: "m" (__m(v)));
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}
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}
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/*
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* No write back please
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*/
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void __flush_invalidate_region(void *start, int size)
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{
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unsigned long v;
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unsigned long begin, end;
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begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
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end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
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& ~(L1_CACHE_BYTES-1);
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for (v = begin; v < end; v+=L1_CACHE_BYTES) {
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asm volatile("ocbi %0"
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: /* no output */
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: "m" (__m(v)));
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}
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}
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/*
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* Write back the range of D-cache, and purge the I-cache.
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*
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* Called from kernel/module.c:sys_init_module and routine for a.out format.
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*/
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void flush_icache_range(unsigned long start, unsigned long end)
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{
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flush_cache_all();
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}
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/*
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* Write back the D-cache and purge the I-cache for signal trampoline.
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* .. which happens to be the same behavior as flush_icache_range().
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* So, we simply flush out a line.
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*/
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void flush_cache_sigtramp(unsigned long addr)
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{
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unsigned long v, index;
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unsigned long flags;
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int i;
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v = addr & ~(L1_CACHE_BYTES-1);
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asm volatile("ocbwb %0"
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: /* no output */
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: "m" (__m(v)));
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index = CACHE_IC_ADDRESS_ARRAY |
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(v & current_cpu_data.icache.entry_mask);
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local_irq_save(flags);
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jump_to_P2();
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for (i = 0; i < current_cpu_data.icache.ways;
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i++, index += current_cpu_data.icache.way_incr)
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ctrl_outl(0, index); /* Clear out Valid-bit */
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back_to_P1();
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wmb();
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local_irq_restore(flags);
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}
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static inline void flush_cache_4096(unsigned long start,
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unsigned long phys)
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{
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unsigned long flags, exec_offset = 0;
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/*
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* All types of SH-4 require PC to be in P2 to operate on the I-cache.
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* Some types of SH-4 require PC to be in P2 to operate on the D-cache.
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*/
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if ((current_cpu_data.flags & CPU_HAS_P2_FLUSH_BUG) ||
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(start < CACHE_OC_ADDRESS_ARRAY))
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exec_offset = 0x20000000;
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local_irq_save(flags);
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__flush_cache_4096(start | SH_CACHE_ASSOC,
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P1SEGADDR(phys), exec_offset);
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local_irq_restore(flags);
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}
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/*
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* Write back & invalidate the D-cache of the page.
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* (To avoid "alias" issues)
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*/
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void flush_dcache_page(struct page *page)
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{
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if (test_bit(PG_mapped, &page->flags)) {
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unsigned long phys = PHYSADDR(page_address(page));
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unsigned long addr = CACHE_OC_ADDRESS_ARRAY;
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int i, n;
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/* Loop all the D-cache */
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n = current_cpu_data.dcache.n_aliases;
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for (i = 0; i < n; i++, addr += 4096)
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flush_cache_4096(addr, phys);
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}
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wmb();
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}
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/* TODO: Selective icache invalidation through IC address array.. */
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static inline void flush_icache_all(void)
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{
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unsigned long flags, ccr;
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local_irq_save(flags);
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jump_to_P2();
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/* Flush I-cache */
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ccr = ctrl_inl(CCR);
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ccr |= CCR_CACHE_ICI;
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ctrl_outl(ccr, CCR);
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/*
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* back_to_P1() will take care of the barrier for us, don't add
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* another one!
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*/
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back_to_P1();
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local_irq_restore(flags);
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}
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void flush_dcache_all(void)
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{
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(*__flush_dcache_segment_fn)(0UL, current_cpu_data.dcache.way_size);
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wmb();
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}
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void flush_cache_all(void)
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{
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flush_dcache_all();
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flush_icache_all();
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}
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static void __flush_cache_mm(struct mm_struct *mm, unsigned long start,
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unsigned long end)
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{
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unsigned long d = 0, p = start & PAGE_MASK;
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unsigned long alias_mask = current_cpu_data.dcache.alias_mask;
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unsigned long n_aliases = current_cpu_data.dcache.n_aliases;
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unsigned long select_bit;
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unsigned long all_aliases_mask;
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unsigned long addr_offset;
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pgd_t *dir;
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pmd_t *pmd;
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pud_t *pud;
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pte_t *pte;
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int i;
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dir = pgd_offset(mm, p);
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pud = pud_offset(dir, p);
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pmd = pmd_offset(pud, p);
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end = PAGE_ALIGN(end);
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all_aliases_mask = (1 << n_aliases) - 1;
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do {
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if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd))) {
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p &= PMD_MASK;
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p += PMD_SIZE;
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pmd++;
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continue;
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}
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pte = pte_offset_kernel(pmd, p);
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do {
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unsigned long phys;
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pte_t entry = *pte;
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if (!(pte_val(entry) & _PAGE_PRESENT)) {
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pte++;
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p += PAGE_SIZE;
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continue;
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}
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phys = pte_val(entry) & PTE_PHYS_MASK;
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if ((p ^ phys) & alias_mask) {
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d |= 1 << ((p & alias_mask) >> PAGE_SHIFT);
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d |= 1 << ((phys & alias_mask) >> PAGE_SHIFT);
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if (d == all_aliases_mask)
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goto loop_exit;
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}
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pte++;
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p += PAGE_SIZE;
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} while (p < end && ((unsigned long)pte & ~PAGE_MASK));
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pmd++;
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} while (p < end);
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loop_exit:
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addr_offset = 0;
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select_bit = 1;
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for (i = 0; i < n_aliases; i++) {
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if (d & select_bit) {
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(*__flush_dcache_segment_fn)(addr_offset, PAGE_SIZE);
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wmb();
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}
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select_bit <<= 1;
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addr_offset += PAGE_SIZE;
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}
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}
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/*
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* Note : (RPC) since the caches are physically tagged, the only point
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* of flush_cache_mm for SH-4 is to get rid of aliases from the
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* D-cache. The assumption elsewhere, e.g. flush_cache_range, is that
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* lines can stay resident so long as the virtual address they were
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* accessed with (hence cache set) is in accord with the physical
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* address (i.e. tag). It's no different here. So I reckon we don't
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* need to flush the I-cache, since aliases don't matter for that. We
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* should try that.
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*
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* Caller takes mm->mmap_sem.
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*/
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void flush_cache_mm(struct mm_struct *mm)
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{
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/*
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* If cache is only 4k-per-way, there are never any 'aliases'. Since
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* the cache is physically tagged, the data can just be left in there.
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*/
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if (current_cpu_data.dcache.n_aliases == 0)
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return;
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/*
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* Don't bother groveling around the dcache for the VMA ranges
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* if there are too many PTEs to make it worthwhile.
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*/
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if (mm->nr_ptes >= MAX_DCACHE_PAGES)
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flush_dcache_all();
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else {
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struct vm_area_struct *vma;
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/*
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* In this case there are reasonably sized ranges to flush,
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* iterate through the VMA list and take care of any aliases.
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*/
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for (vma = mm->mmap; vma; vma = vma->vm_next)
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__flush_cache_mm(mm, vma->vm_start, vma->vm_end);
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}
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/* Only touch the icache if one of the VMAs has VM_EXEC set. */
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if (mm->exec_vm)
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flush_icache_all();
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}
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/*
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* Write back and invalidate I/D-caches for the page.
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*
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* ADDR: Virtual Address (U0 address)
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* PFN: Physical page number
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*/
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void flush_cache_page(struct vm_area_struct *vma, unsigned long address,
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unsigned long pfn)
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{
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unsigned long phys = pfn << PAGE_SHIFT;
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unsigned int alias_mask;
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alias_mask = current_cpu_data.dcache.alias_mask;
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/* We only need to flush D-cache when we have alias */
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if ((address^phys) & alias_mask) {
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/* Loop 4K of the D-cache */
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flush_cache_4096(
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CACHE_OC_ADDRESS_ARRAY | (address & alias_mask),
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phys);
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/* Loop another 4K of the D-cache */
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flush_cache_4096(
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CACHE_OC_ADDRESS_ARRAY | (phys & alias_mask),
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phys);
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}
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alias_mask = current_cpu_data.icache.alias_mask;
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if (vma->vm_flags & VM_EXEC) {
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/*
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* Evict entries from the portion of the cache from which code
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* may have been executed at this address (virtual). There's
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* no need to evict from the portion corresponding to the
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* physical address as for the D-cache, because we know the
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* kernel has never executed the code through its identity
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* translation.
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*/
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flush_cache_4096(
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CACHE_IC_ADDRESS_ARRAY | (address & alias_mask),
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phys);
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}
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}
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/*
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* Write back and invalidate D-caches.
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*
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* START, END: Virtual Address (U0 address)
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*
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* NOTE: We need to flush the _physical_ page entry.
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* Flushing the cache lines for U0 only isn't enough.
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* We need to flush for P1 too, which may contain aliases.
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*/
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void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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/*
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* If cache is only 4k-per-way, there are never any 'aliases'. Since
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* the cache is physically tagged, the data can just be left in there.
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*/
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if (current_cpu_data.dcache.n_aliases == 0)
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return;
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/*
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* Don't bother with the lookup and alias check if we have a
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* wide range to cover, just blow away the dcache in its
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* entirety instead. -- PFM.
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*/
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if (((end - start) >> PAGE_SHIFT) >= MAX_DCACHE_PAGES)
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flush_dcache_all();
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else
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__flush_cache_mm(vma->vm_mm, start, end);
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if (vma->vm_flags & VM_EXEC) {
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/*
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* TODO: Is this required??? Need to look at how I-cache
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* coherency is assured when new programs are loaded to see if
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* this matters.
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*/
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flush_icache_all();
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}
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}
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/*
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* flush_icache_user_range
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* @vma: VMA of the process
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* @page: page
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* @addr: U0 address
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* @len: length of the range (< page size)
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*/
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void flush_icache_user_range(struct vm_area_struct *vma,
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struct page *page, unsigned long addr, int len)
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{
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flush_cache_page(vma, addr, page_to_pfn(page));
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mb();
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}
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/**
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* __flush_cache_4096
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*
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* @addr: address in memory mapped cache array
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* @phys: P1 address to flush (has to match tags if addr has 'A' bit
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* set i.e. associative write)
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* @exec_offset: set to 0x20000000 if flush has to be executed from P2
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* region else 0x0
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*
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* The offset into the cache array implied by 'addr' selects the
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* 'colour' of the virtual address range that will be flushed. The
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* operation (purge/write-back) is selected by the lower 2 bits of
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* 'phys'.
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*/
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static void __flush_cache_4096(unsigned long addr, unsigned long phys,
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unsigned long exec_offset)
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{
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int way_count;
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unsigned long base_addr = addr;
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struct cache_info *dcache;
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unsigned long way_incr;
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unsigned long a, ea, p;
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unsigned long temp_pc;
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dcache = ¤t_cpu_data.dcache;
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/* Write this way for better assembly. */
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way_count = dcache->ways;
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way_incr = dcache->way_incr;
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/*
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* Apply exec_offset (i.e. branch to P2 if required.).
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*
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* FIXME:
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*
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* If I write "=r" for the (temp_pc), it puts this in r6 hence
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* trashing exec_offset before it's been added on - why? Hence
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* "=&r" as a 'workaround'
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*/
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asm volatile("mov.l 1f, %0\n\t"
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"add %1, %0\n\t"
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"jmp @%0\n\t"
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"nop\n\t"
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".balign 4\n\t"
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"1: .long 2f\n\t"
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"2:\n" : "=&r" (temp_pc) : "r" (exec_offset));
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/*
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* We know there will be >=1 iteration, so write as do-while to avoid
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* pointless nead-of-loop check for 0 iterations.
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*/
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do {
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ea = base_addr + PAGE_SIZE;
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a = base_addr;
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p = phys;
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do {
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*(volatile unsigned long *)a = p;
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/*
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* Next line: intentionally not p+32, saves an add, p
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* will do since only the cache tag bits need to
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* match.
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*/
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*(volatile unsigned long *)(a+32) = p;
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a += 64;
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p += 64;
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} while (a < ea);
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base_addr += way_incr;
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} while (--way_count != 0);
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}
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/*
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* Break the 1, 2 and 4 way variants of this out into separate functions to
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* avoid nearly all the overhead of having the conditional stuff in the function
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* bodies (+ the 1 and 2 way cases avoid saving any registers too).
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*/
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static void __flush_dcache_segment_1way(unsigned long start,
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unsigned long extent_per_way)
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{
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unsigned long orig_sr, sr_with_bl;
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unsigned long base_addr;
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unsigned long way_incr, linesz, way_size;
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struct cache_info *dcache;
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register unsigned long a0, a0e;
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asm volatile("stc sr, %0" : "=r" (orig_sr));
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sr_with_bl = orig_sr | (1<<28);
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base_addr = ((unsigned long)&empty_zero_page[0]);
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/*
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* The previous code aligned base_addr to 16k, i.e. the way_size of all
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* existing SH-4 D-caches. Whilst I don't see a need to have this
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* aligned to any better than the cache line size (which it will be
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* anyway by construction), let's align it to at least the way_size of
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* any existing or conceivable SH-4 D-cache. -- RPC
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*/
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base_addr = ((base_addr >> 16) << 16);
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base_addr |= start;
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dcache = ¤t_cpu_data.dcache;
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linesz = dcache->linesz;
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way_incr = dcache->way_incr;
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way_size = dcache->way_size;
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a0 = base_addr;
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a0e = base_addr + extent_per_way;
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do {
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asm volatile("ldc %0, sr" : : "r" (sr_with_bl));
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asm volatile("movca.l r0, @%0\n\t"
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"ocbi @%0" : : "r" (a0));
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a0 += linesz;
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asm volatile("movca.l r0, @%0\n\t"
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"ocbi @%0" : : "r" (a0));
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a0 += linesz;
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asm volatile("movca.l r0, @%0\n\t"
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"ocbi @%0" : : "r" (a0));
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a0 += linesz;
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asm volatile("movca.l r0, @%0\n\t"
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"ocbi @%0" : : "r" (a0));
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asm volatile("ldc %0, sr" : : "r" (orig_sr));
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a0 += linesz;
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} while (a0 < a0e);
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}
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static void __flush_dcache_segment_2way(unsigned long start,
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unsigned long extent_per_way)
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{
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unsigned long orig_sr, sr_with_bl;
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unsigned long base_addr;
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unsigned long way_incr, linesz, way_size;
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struct cache_info *dcache;
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register unsigned long a0, a1, a0e;
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asm volatile("stc sr, %0" : "=r" (orig_sr));
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sr_with_bl = orig_sr | (1<<28);
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base_addr = ((unsigned long)&empty_zero_page[0]);
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/* See comment under 1-way above */
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base_addr = ((base_addr >> 16) << 16);
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base_addr |= start;
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dcache = ¤t_cpu_data.dcache;
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linesz = dcache->linesz;
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way_incr = dcache->way_incr;
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way_size = dcache->way_size;
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a0 = base_addr;
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a1 = a0 + way_incr;
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a0e = base_addr + extent_per_way;
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do {
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asm volatile("ldc %0, sr" : : "r" (sr_with_bl));
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asm volatile("movca.l r0, @%0\n\t"
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"movca.l r0, @%1\n\t"
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"ocbi @%0\n\t"
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"ocbi @%1" : :
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"r" (a0), "r" (a1));
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a0 += linesz;
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a1 += linesz;
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asm volatile("movca.l r0, @%0\n\t"
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"movca.l r0, @%1\n\t"
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"ocbi @%0\n\t"
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"ocbi @%1" : :
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"r" (a0), "r" (a1));
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a0 += linesz;
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a1 += linesz;
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asm volatile("movca.l r0, @%0\n\t"
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"movca.l r0, @%1\n\t"
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"ocbi @%0\n\t"
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"ocbi @%1" : :
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"r" (a0), "r" (a1));
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a0 += linesz;
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a1 += linesz;
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asm volatile("movca.l r0, @%0\n\t"
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"movca.l r0, @%1\n\t"
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"ocbi @%0\n\t"
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"ocbi @%1" : :
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"r" (a0), "r" (a1));
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asm volatile("ldc %0, sr" : : "r" (orig_sr));
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a0 += linesz;
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a1 += linesz;
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} while (a0 < a0e);
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}
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static void __flush_dcache_segment_4way(unsigned long start,
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unsigned long extent_per_way)
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{
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unsigned long orig_sr, sr_with_bl;
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unsigned long base_addr;
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unsigned long way_incr, linesz, way_size;
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struct cache_info *dcache;
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register unsigned long a0, a1, a2, a3, a0e;
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asm volatile("stc sr, %0" : "=r" (orig_sr));
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sr_with_bl = orig_sr | (1<<28);
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base_addr = ((unsigned long)&empty_zero_page[0]);
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/* See comment under 1-way above */
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base_addr = ((base_addr >> 16) << 16);
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base_addr |= start;
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dcache = ¤t_cpu_data.dcache;
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linesz = dcache->linesz;
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way_incr = dcache->way_incr;
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way_size = dcache->way_size;
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a0 = base_addr;
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a1 = a0 + way_incr;
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a2 = a1 + way_incr;
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a3 = a2 + way_incr;
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a0e = base_addr + extent_per_way;
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do {
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asm volatile("ldc %0, sr" : : "r" (sr_with_bl));
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asm volatile("movca.l r0, @%0\n\t"
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"movca.l r0, @%1\n\t"
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"movca.l r0, @%2\n\t"
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"movca.l r0, @%3\n\t"
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"ocbi @%0\n\t"
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"ocbi @%1\n\t"
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"ocbi @%2\n\t"
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"ocbi @%3\n\t" : :
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"r" (a0), "r" (a1), "r" (a2), "r" (a3));
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a0 += linesz;
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a1 += linesz;
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a2 += linesz;
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a3 += linesz;
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asm volatile("movca.l r0, @%0\n\t"
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"movca.l r0, @%1\n\t"
|
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"movca.l r0, @%2\n\t"
|
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"movca.l r0, @%3\n\t"
|
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"ocbi @%0\n\t"
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"ocbi @%1\n\t"
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"ocbi @%2\n\t"
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"ocbi @%3\n\t" : :
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"r" (a0), "r" (a1), "r" (a2), "r" (a3));
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a0 += linesz;
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a1 += linesz;
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a2 += linesz;
|
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a3 += linesz;
|
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asm volatile("movca.l r0, @%0\n\t"
|
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"movca.l r0, @%1\n\t"
|
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"movca.l r0, @%2\n\t"
|
|
"movca.l r0, @%3\n\t"
|
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"ocbi @%0\n\t"
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"ocbi @%1\n\t"
|
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"ocbi @%2\n\t"
|
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"ocbi @%3\n\t" : :
|
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"r" (a0), "r" (a1), "r" (a2), "r" (a3));
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a0 += linesz;
|
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a1 += linesz;
|
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a2 += linesz;
|
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a3 += linesz;
|
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asm volatile("movca.l r0, @%0\n\t"
|
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"movca.l r0, @%1\n\t"
|
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"movca.l r0, @%2\n\t"
|
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"movca.l r0, @%3\n\t"
|
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"ocbi @%0\n\t"
|
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"ocbi @%1\n\t"
|
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"ocbi @%2\n\t"
|
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"ocbi @%3\n\t" : :
|
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"r" (a0), "r" (a1), "r" (a2), "r" (a3));
|
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asm volatile("ldc %0, sr" : : "r" (orig_sr));
|
|
a0 += linesz;
|
|
a1 += linesz;
|
|
a2 += linesz;
|
|
a3 += linesz;
|
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} while (a0 < a0e);
|
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}
|