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sh: Optimized cache handling for SH-4/SH-4A caches.

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This reworks some of the SH-4 cache handling code to more easily
accomodate newer-style caches (particularly for the > direct-mapped
case), as well as optimizing some of the old code.

Signed-off-by: Richard Curnow <richard.curnow@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Richard Curnow 2006-09-27 14:09:26 +09:00 committed by Paul Mundt
parent fdfc74f9fc
commit b638d0b921
5 changed files with 475 additions and 190 deletions
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16
arch/sh/kernel/cpu/init.c
View File

@ -4,6 +4,7 @@
* CPU init code
*
* Copyright (C) 2002, 2003 Paul Mundt
* Copyright (C) 2003 Richard Curnow
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
@ -51,7 +52,15 @@ static void __init cache_init(void)
ccr = ctrl_inl(CCR);
/*
* If the cache is already enabled .. flush it.
* At this point we don't know whether the cache is enabled or not - a
* bootloader may have enabled it. There are at least 2 things that
* could be dirty in the cache at this point:
* 1. kernel command line set up by boot loader
* 2. spilled registers from the prolog of this function
* => before re-initialising the cache, we must do a purge of the whole
* cache out to memory for safety. As long as nothing is spilled
* during the loop to lines that have already been done, this is safe.
* - RPC
*/
if (ccr & CCR_CACHE_ENABLE) {
unsigned long ways, waysize, addrstart;
@ -98,6 +107,8 @@ static void __init cache_init(void)
/* Force EMODE if possible */
if (cpu_data->dcache.ways > 1)
flags |= CCR_CACHE_EMODE;
else
flags &= ~CCR_CACHE_EMODE;
#endif
#ifdef CONFIG_SH_WRITETHROUGH
@ -112,6 +123,9 @@ static void __init cache_init(void)
/* Turn on OCRAM -- halve the OC */
flags |= CCR_CACHE_ORA;
cpu_data->dcache.sets >>= 1;
cpu_data->dcache.way_size = cpu_data->dcache.sets *
cpu_data->dcache.linesz;
#endif
ctrl_outl(flags, CCR);

11
arch/sh/kernel/cpu/sh4/probe.c
View File

@ -113,6 +113,11 @@ int __init detect_cpu_and_cache_system(void)
break;
}
#ifdef CONFIG_SH_DIRECT_MAPPED
cpu_data->icache.ways = 1;
cpu_data->dcache.ways = 1;
#endif
/*
* On anything that's not a direct-mapped cache, look to the CVR
* for I/D-cache specifics.
@ -125,6 +130,9 @@ int __init detect_cpu_and_cache_system(void)
(cpu_data->icache.way_incr - (1 << 5));
}
cpu_data->icache.way_size = cpu_data->icache.sets *
cpu_data->icache.linesz;
if (cpu_data->dcache.ways > 1) {
size = sizes[(cvr >> 16) & 0xf];
cpu_data->dcache.way_incr = (size >> 1);
@ -133,6 +141,9 @@ int __init detect_cpu_and_cache_system(void)
(cpu_data->dcache.way_incr - (1 << 5));
}
cpu_data->dcache.way_size = cpu_data->dcache.sets *
cpu_data->dcache.linesz;
return 0;
}

509
arch/sh/mm/cache-sh4.c
View File

@ -25,28 +25,95 @@
#include <asm/mmu_context.h>
#include <asm/cacheflush.h>
extern void __flush_cache_4096(unsigned long addr, unsigned long phys,
static void __flush_dcache_segment_1way(unsigned long start,
unsigned long extent);
static void __flush_dcache_segment_2way(unsigned long start,
unsigned long extent);
static void __flush_dcache_segment_4way(unsigned long start,
unsigned long extent);
static void __flush_cache_4096(unsigned long addr, unsigned long phys,
unsigned long exec_offset);
extern void __flush_cache_4096_all(unsigned long start);
static void __flush_cache_4096_all_ex(unsigned long start);
extern void __flush_dcache_all(void);
static void __flush_dcache_all_ex(void);
/*
* This is initialised here to ensure that it is not placed in the BSS. If
* that were to happen, note that cache_init gets called before the BSS is
* cleared, so this would get nulled out which would be hopeless.
*/
static void (*__flush_dcache_segment_fn)(unsigned long, unsigned long) =
(void (*)(unsigned long, unsigned long))0xdeadbeef;
static void compute_alias(struct cache_info *c)
{
c->alias_mask = ((c->sets - 1) << c->entry_shift) & ~(PAGE_SIZE - 1);
c->n_aliases = (c->alias_mask >> PAGE_SHIFT) + 1;
}
static void __init emit_cache_params(void)
{
printk("PVR=%08x CVR=%08x PRR=%08x\n",
ctrl_inl(CCN_PVR),
ctrl_inl(CCN_CVR),
ctrl_inl(CCN_PRR));
printk("I-cache : n_ways=%d n_sets=%d way_incr=%d\n",
cpu_data->icache.ways,
cpu_data->icache.sets,
cpu_data->icache.way_incr);
printk("I-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
cpu_data->icache.entry_mask,
cpu_data->icache.alias_mask,
cpu_data->icache.n_aliases);
printk("D-cache : n_ways=%d n_sets=%d way_incr=%d\n",
cpu_data->dcache.ways,
cpu_data->dcache.sets,
cpu_data->dcache.way_incr);
printk("D-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
cpu_data->dcache.entry_mask,
cpu_data->dcache.alias_mask,
cpu_data->dcache.n_aliases);
if (!__flush_dcache_segment_fn)
panic("unknown number of cache ways\n");
}
/*
* SH-4 has virtually indexed and physically tagged cache.
*/
struct semaphore p3map_sem[4];
/* Worst case assumed to be 64k cache, direct-mapped i.e. 4 synonym bits. */
#define MAX_P3_SEMAPHORES 16
struct semaphore p3map_sem[MAX_P3_SEMAPHORES];
void __init p3_cache_init(void)
{
int i;
compute_alias(&cpu_data->icache);
compute_alias(&cpu_data->dcache);
switch (cpu_data->dcache.ways) {
case 1:
__flush_dcache_segment_fn = __flush_dcache_segment_1way;
break;
case 2:
__flush_dcache_segment_fn = __flush_dcache_segment_2way;
break;
case 4:
__flush_dcache_segment_fn = __flush_dcache_segment_4way;
break;
default:
__flush_dcache_segment_fn = NULL;
break;
}
emit_cache_params();
if (remap_area_pages(P3SEG, 0, PAGE_SIZE * 4, _PAGE_CACHABLE))
panic("%s failed.", __FUNCTION__);
sema_init (&p3map_sem[0], 1);
sema_init (&p3map_sem[1], 1);
sema_init (&p3map_sem[2], 1);
sema_init (&p3map_sem[3], 1);
for (i = 0; i < cpu_data->dcache.n_aliases; i++)
sema_init(&p3map_sem[i], 1);
}
/*
@ -91,7 +158,6 @@ void __flush_purge_region(void *start, int size)
}
}
/*
* No write back please
*/
@ -110,46 +176,6 @@ void __flush_invalidate_region(void *start, int size)
}
}
static void __flush_dcache_all_ex(void)
{
unsigned long addr, end_addr, entry_offset;
end_addr = CACHE_OC_ADDRESS_ARRAY +
(cpu_data->dcache.sets << cpu_data->dcache.entry_shift) *
cpu_data->dcache.ways;
entry_offset = 1 << cpu_data->dcache.entry_shift;
for (addr = CACHE_OC_ADDRESS_ARRAY;
addr < end_addr;
addr += entry_offset) {
ctrl_outl(0, addr);
}
}
static void __flush_cache_4096_all_ex(unsigned long start)
{
unsigned long addr, entry_offset;
int i;
entry_offset = 1 << cpu_data->dcache.entry_shift;
for (i = 0; i < cpu_data->dcache.ways;
i++, start += cpu_data->dcache.way_incr) {
for (addr = CACHE_OC_ADDRESS_ARRAY + start;
addr < CACHE_OC_ADDRESS_ARRAY + 4096 + start;
addr += entry_offset) {
ctrl_outl(0, addr);
}
}
}
void flush_cache_4096_all(unsigned long start)
{
if (cpu_data->dcache.ways == 1)
__flush_cache_4096_all(start);
else
__flush_cache_4096_all_ex(start);
}
/*
* Write back the range of D-cache, and purge the I-cache.
*
@ -180,9 +206,11 @@ void flush_cache_sigtramp(unsigned long addr)
local_irq_save(flags);
jump_to_P2();
for (i = 0; i < cpu_data->icache.ways;
i++, index += cpu_data->icache.way_incr)
ctrl_outl(0, index); /* Clear out Valid-bit */
back_to_P1();
wmb();
local_irq_restore(flags);
@ -194,8 +222,8 @@ static inline void flush_cache_4096(unsigned long start,
unsigned long flags;
/*
* SH7751, SH7751R, and ST40 have no restriction to handle cache.
* (While SH7750 must do that at P2 area.)
* All types of SH-4 require PC to be in P2 to operate on the I-cache.
* Some types of SH-4 require PC to be in P2 to operate on the D-cache.
*/
if ((cpu_data->flags & CPU_HAS_P2_FLUSH_BUG)
|| start < CACHE_OC_ADDRESS_ARRAY) {
@ -217,12 +245,13 @@ void flush_dcache_page(struct page *page)
{
if (test_bit(PG_mapped, &page->flags)) {
unsigned long phys = PHYSADDR(page_address(page));
unsigned long addr = CACHE_OC_ADDRESS_ARRAY;
int i, n;
/* Loop all the D-cache */
flush_cache_4096(CACHE_OC_ADDRESS_ARRAY, phys);
flush_cache_4096(CACHE_OC_ADDRESS_ARRAY | 0x1000, phys);
flush_cache_4096(CACHE_OC_ADDRESS_ARRAY | 0x2000, phys);
flush_cache_4096(CACHE_OC_ADDRESS_ARRAY | 0x3000, phys);
n = cpu_data->dcache.n_aliases;
for (i = 0; i < n; i++, addr += PAGE_SIZE)
flush_cache_4096(addr, phys);
}
wmb();
@ -246,10 +275,7 @@ static inline void flush_icache_all(void)
void flush_dcache_all(void)
{
if (cpu_data->dcache.ways == 1)
__flush_dcache_all();
else
__flush_dcache_all_ex();
(*__flush_dcache_segment_fn)(0UL, cpu_data->dcache.way_size);
wmb();
}
@ -261,6 +287,16 @@ void flush_cache_all(void)
void flush_cache_mm(struct mm_struct *mm)
{
/*
* Note : (RPC) since the caches are physically tagged, the only point
* of flush_cache_mm for SH-4 is to get rid of aliases from the
* D-cache. The assumption elsewhere, e.g. flush_cache_range, is that
* lines can stay resident so long as the virtual address they were
* accessed with (hence cache set) is in accord with the physical
* address (i.e. tag). It's no different here. So I reckon we don't
* need to flush the I-cache, since aliases don't matter for that. We
* should try that.
*/
flush_cache_all();
}
@ -273,25 +309,37 @@ void flush_cache_mm(struct mm_struct *mm)
void flush_cache_page(struct vm_area_struct *vma, unsigned long address, unsigned long pfn)
{
unsigned long phys = pfn << PAGE_SHIFT;
unsigned int alias_mask;
alias_mask = cpu_data->dcache.alias_mask;
/* We only need to flush D-cache when we have alias */
if ((address^phys) & CACHE_ALIAS) {
if ((address^phys) & alias_mask) {
/* Loop 4K of the D-cache */
flush_cache_4096(
CACHE_OC_ADDRESS_ARRAY | (address & CACHE_ALIAS),
CACHE_OC_ADDRESS_ARRAY | (address & alias_mask),
phys);
/* Loop another 4K of the D-cache */
flush_cache_4096(
CACHE_OC_ADDRESS_ARRAY | (phys & CACHE_ALIAS),
CACHE_OC_ADDRESS_ARRAY | (phys & alias_mask),
phys);
}
if (vma->vm_flags & VM_EXEC)
/* Loop 4K (half) of the I-cache */
alias_mask = cpu_data->icache.alias_mask;
if (vma->vm_flags & VM_EXEC) {
/*
* Evict entries from the portion of the cache from which code
* may have been executed at this address (virtual). There's
* no need to evict from the portion corresponding to the
* physical address as for the D-cache, because we know the
* kernel has never executed the code through its identity
* translation.
*/
flush_cache_4096(
CACHE_IC_ADDRESS_ARRAY | (address & 0x1000),
CACHE_IC_ADDRESS_ARRAY | (address & alias_mask),
phys);
}
}
/*
* Write back and invalidate D-caches.
@ -305,14 +353,28 @@ void flush_cache_page(struct vm_area_struct *vma, unsigned long address, unsigne
void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
unsigned long p = start & PAGE_MASK;
unsigned long d = 0, p = start & PAGE_MASK;
unsigned long alias_mask = cpu_data->dcache.alias_mask;
unsigned long n_aliases = cpu_data->dcache.n_aliases;
unsigned long select_bit;
unsigned long all_aliases_mask;
unsigned long addr_offset;
unsigned long phys;
pgd_t *dir;
pmd_t *pmd;
pud_t *pud;
pte_t *pte;
pte_t entry;
unsigned long phys;
unsigned long d = 0;
int i;
/*
* If cache is only 4k-per-way, there are never any 'aliases'. Since
* the cache is physically tagged, the data can just be left in there.
*/
if (n_aliases == 0)
return;
all_aliases_mask = (1 << n_aliases) - 1;
/*
* Don't bother with the lookup and alias check if we have a
@ -338,37 +400,50 @@ void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
p &= ~((1 << PMD_SHIFT) - 1);
p += (1 << PMD_SHIFT);
pmd++;
continue;
}
pte = pte_offset_kernel(pmd, p);
do {
entry = *pte;
if ((pte_val(entry) & _PAGE_PRESENT)) {
phys = pte_val(entry) & PTE_PHYS_MASK;
if ((p^phys) & CACHE_ALIAS) {
d |= 1 << ((p & CACHE_ALIAS)>>12);
d |= 1 << ((phys & CACHE_ALIAS)>>12);
if (d == 0x0f)
if ((p ^ phys) & alias_mask) {
d |= 1 << ((p & alias_mask) >> PAGE_SHIFT);
d |= 1 << ((phys & alias_mask) >> PAGE_SHIFT);
if (d == all_aliases_mask)
goto loop_exit;
}
}
pte++;
p += PAGE_SIZE;
} while (p < end && ((unsigned long)pte & ~PAGE_MASK));
pmd++;
} while (p < end);
loop_exit:
if (d & 1)
flush_cache_4096_all(0);
if (d & 2)
flush_cache_4096_all(0x1000);
if (d & 4)
flush_cache_4096_all(0x2000);
if (d & 8)
flush_cache_4096_all(0x3000);
if (vma->vm_flags & VM_EXEC)
for (i = 0, select_bit = 0x1, addr_offset = 0x0; i < n_aliases;
i++, select_bit <<= 1, addr_offset += PAGE_SIZE)
if (d & select_bit) {
(*__flush_dcache_segment_fn)(addr_offset, PAGE_SIZE);
wmb();
}
if (vma->vm_flags & VM_EXEC) {
/*
* TODO: Is this required??? Need to look at how I-cache
* coherency is assured when new programs are loaded to see if
* this matters.
*/
flush_icache_all();
}
}
/*
* flush_icache_user_range
@ -384,3 +459,271 @@ void flush_icache_user_range(struct vm_area_struct *vma,
mb();
}
/**
* __flush_cache_4096
*
* @addr: address in memory mapped cache array
* @phys: P1 address to flush (has to match tags if addr has 'A' bit
* set i.e. associative write)
* @exec_offset: set to 0x20000000 if flush has to be executed from P2
* region else 0x0
*
* The offset into the cache array implied by 'addr' selects the
* 'colour' of the virtual address range that will be flushed. The
* operation (purge/write-back) is selected by the lower 2 bits of
* 'phys'.
*/
static void __flush_cache_4096(unsigned long addr, unsigned long phys,
unsigned long exec_offset)
{
int way_count;
unsigned long base_addr = addr;
struct cache_info *dcache;
unsigned long way_incr;
unsigned long a, ea, p;
unsigned long temp_pc;
dcache = &cpu_data->dcache;
/* Write this way for better assembly. */
way_count = dcache->ways;
way_incr = dcache->way_incr;
/*
* Apply exec_offset (i.e. branch to P2 if required.).
*
* FIXME:
*
* If I write "=r" for the (temp_pc), it puts this in r6 hence
* trashing exec_offset before it's been added on - why? Hence
* "=&r" as a 'workaround'
*/
asm volatile("mov.l 1f, %0\n\t"
"add %1, %0\n\t"
"jmp @%0\n\t"
"nop\n\t"
".balign 4\n\t"
"1: .long 2f\n\t"
"2:\n" : "=&r" (temp_pc) : "r" (exec_offset));
/*
* We know there will be >=1 iteration, so write as do-while to avoid
* pointless nead-of-loop check for 0 iterations.
*/
do {
ea = base_addr + PAGE_SIZE;
a = base_addr;
p = phys;
do {
*(volatile unsigned long *)a = p;
/*
* Next line: intentionally not p+32, saves an add, p
* will do since only the cache tag bits need to
* match.
*/
*(volatile unsigned long *)(a+32) = p;
a += 64;
p += 64;
} while (a < ea);
base_addr += way_incr;
} while (--way_count != 0);
}
/*
* Break the 1, 2 and 4 way variants of this out into separate functions to
* avoid nearly all the overhead of having the conditional stuff in the function
* bodies (+ the 1 and 2 way cases avoid saving any registers too).
*/
static void __flush_dcache_segment_1way(unsigned long start,
unsigned long extent_per_way)
{
unsigned long orig_sr, sr_with_bl;
unsigned long base_addr;
unsigned long way_incr, linesz, way_size;
struct cache_info *dcache;
register unsigned long a0, a0e;
asm volatile("stc sr, %0" : "=r" (orig_sr));
sr_with_bl = orig_sr | (1<<28);
base_addr = ((unsigned long)&empty_zero_page[0]);
/*
* The previous code aligned base_addr to 16k, i.e. the way_size of all
* existing SH-4 D-caches. Whilst I don't see a need to have this
* aligned to any better than the cache line size (which it will be
* anyway by construction), let's align it to at least the way_size of
* any existing or conceivable SH-4 D-cache. -- RPC
*/
base_addr = ((base_addr >> 16) << 16);
base_addr |= start;
dcache = &cpu_data->dcache;
linesz = dcache->linesz;
way_incr = dcache->way_incr;
way_size = dcache->way_size;
a0 = base_addr;
a0e = base_addr + extent_per_way;
do {
asm volatile("ldc %0, sr" : : "r" (sr_with_bl));
asm volatile("movca.l r0, @%0\n\t"
"ocbi @%0" : : "r" (a0));
a0 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"ocbi @%0" : : "r" (a0));
a0 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"ocbi @%0" : : "r" (a0));
a0 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"ocbi @%0" : : "r" (a0));
asm volatile("ldc %0, sr" : : "r" (orig_sr));
a0 += linesz;
} while (a0 < a0e);
}
static void __flush_dcache_segment_2way(unsigned long start,
unsigned long extent_per_way)
{
unsigned long orig_sr, sr_with_bl;
unsigned long base_addr;
unsigned long way_incr, linesz, way_size;
struct cache_info *dcache;
register unsigned long a0, a1, a0e;
asm volatile("stc sr, %0" : "=r" (orig_sr));
sr_with_bl = orig_sr | (1<<28);
base_addr = ((unsigned long)&empty_zero_page[0]);
/* See comment under 1-way above */
base_addr = ((base_addr >> 16) << 16);
base_addr |= start;
dcache = &cpu_data->dcache;
linesz = dcache->linesz;
way_incr = dcache->way_incr;
way_size = dcache->way_size;
a0 = base_addr;
a1 = a0 + way_incr;
a0e = base_addr + extent_per_way;
do {
asm volatile("ldc %0, sr" : : "r" (sr_with_bl));
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"ocbi @%0\n\t"
"ocbi @%1" : :
"r" (a0), "r" (a1));
a0 += linesz;
a1 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"ocbi @%0\n\t"
"ocbi @%1" : :
"r" (a0), "r" (a1));
a0 += linesz;
a1 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"ocbi @%0\n\t"
"ocbi @%1" : :
"r" (a0), "r" (a1));
a0 += linesz;
a1 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"ocbi @%0\n\t"
"ocbi @%1" : :
"r" (a0), "r" (a1));
asm volatile("ldc %0, sr" : : "r" (orig_sr));
a0 += linesz;
a1 += linesz;
} while (a0 < a0e);
}
static void __flush_dcache_segment_4way(unsigned long start,
unsigned long extent_per_way)
{
unsigned long orig_sr, sr_with_bl;
unsigned long base_addr;
unsigned long way_incr, linesz, way_size;
struct cache_info *dcache;
register unsigned long a0, a1, a2, a3, a0e;
asm volatile("stc sr, %0" : "=r" (orig_sr));
sr_with_bl = orig_sr | (1<<28);
base_addr = ((unsigned long)&empty_zero_page[0]);
/* See comment under 1-way above */
base_addr = ((base_addr >> 16) << 16);
base_addr |= start;
dcache = &cpu_data->dcache;
linesz = dcache->linesz;
way_incr = dcache->way_incr;
way_size = dcache->way_size;
a0 = base_addr;
a1 = a0 + way_incr;
a2 = a1 + way_incr;
a3 = a2 + way_incr;
a0e = base_addr + extent_per_way;
do {
asm volatile("ldc %0, sr" : : "r" (sr_with_bl));
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"movca.l r0, @%2\n\t"
"movca.l r0, @%3\n\t"
"ocbi @%0\n\t"
"ocbi @%1\n\t"
"ocbi @%2\n\t"
"ocbi @%3\n\t" : :
"r" (a0), "r" (a1), "r" (a2), "r" (a3));
a0 += linesz;
a1 += linesz;
a2 += linesz;
a3 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"movca.l r0, @%2\n\t"
"movca.l r0, @%3\n\t"
"ocbi @%0\n\t"
"ocbi @%1\n\t"
"ocbi @%2\n\t"
"ocbi @%3\n\t" : :
"r" (a0), "r" (a1), "r" (a2), "r" (a3));
a0 += linesz;
a1 += linesz;
a2 += linesz;
a3 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"movca.l r0, @%2\n\t"
"movca.l r0, @%3\n\t"
"ocbi @%0\n\t"
"ocbi @%1\n\t"
"ocbi @%2\n\t"
"ocbi @%3\n\t" : :
"r" (a0), "r" (a1), "r" (a2), "r" (a3));
a0 += linesz;
a1 += linesz;
a2 += linesz;
a3 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"movca.l r0, @%2\n\t"
"movca.l r0, @%3\n\t"
"ocbi @%0\n\t"
"ocbi @%1\n\t"
"ocbi @%2\n\t"
"ocbi @%3\n\t" : :
"r" (a0), "r" (a1), "r" (a2), "r" (a3));
asm volatile("ldc %0, sr" : : "r" (orig_sr));
a0 += linesz;
a1 += linesz;
a2 += linesz;
a3 += linesz;
} while (a0 < a0e);
}

99
arch/sh/mm/clear_page.S
View File

@ -193,102 +193,5 @@ ENTRY(__clear_user_page)
nop
.L4096: .word 4096
ENTRY(__flush_cache_4096)
mov.l 1f,r3
add r6,r3
mov r4,r0
mov #64,r2
shll r2
mov #64,r6
jmp @r3
mov #96,r7
.align 2
1: .long 2f
2:
.rept 32
mov.l r5,@r0
mov.l r5,@(32,r0)
mov.l r5,@(r0,r6)
mov.l r5,@(r0,r7)
add r2,r5
add r2,r0
.endr
nop
nop
nop
nop
nop
nop
nop
rts
nop
ENTRY(__flush_dcache_all)
mov.l 2f,r0
mov.l 3f,r4
and r0,r4 ! r4 = (unsigned long)&empty_zero_page[0] & ~0xffffc000
stc sr,r1 ! save SR
mov.l 4f,r2
or r1,r2
mov #32,r3
shll2 r3
1:
ldc r2,sr ! set BL bit
movca.l r0,@r4
ocbi @r4
add #32,r4
movca.l r0,@r4
ocbi @r4
add #32,r4
movca.l r0,@r4
ocbi @r4
add #32,r4
movca.l r0,@r4
ocbi @r4
ldc r1,sr ! restore SR
dt r3
bf/s 1b
add #32,r4
rts
nop
.align 2
2: .long 0xffffc000
3: .long empty_zero_page
4: .long 0x10000000 ! BL bit
/* __flush_cache_4096_all(unsigned long addr) */
ENTRY(__flush_cache_4096_all)
mov.l 2f,r0
mov.l 3f,r2
and r0,r2
or r2,r4 ! r4 = addr | (unsigned long)&empty_zero_page[0] & ~0x3fff
stc sr,r1 ! save SR
mov.l 4f,r2
or r1,r2
mov #32,r3
1:
ldc r2,sr ! set BL bit
movca.l r0,@r4
ocbi @r4
add #32,r4
movca.l r0,@r4
ocbi @r4
add #32,r4
movca.l r0,@r4
ocbi @r4
add #32,r4
movca.l r0,@r4
ocbi @r4
ldc r1,sr ! restore SR
dt r3
bf/s 1b
add #32,r4
rts
nop
.align 2
2: .long 0xffffc000
3: .long empty_zero_page
4: .long 0x10000000 ! BL bit
#endif

22
include/asm-sh/cache.h
View File

@ -23,15 +23,29 @@
#define L1_CACHE_ALIGN(x) (((x)+(L1_CACHE_BYTES-1))&~(L1_CACHE_BYTES-1))
struct cache_info {
unsigned int ways;
unsigned int sets;
unsigned int linesz;
unsigned int ways; /* Number of cache ways */
unsigned int sets; /* Number of cache sets */
unsigned int linesz; /* Cache line size (bytes) */
unsigned int way_size; /* sets * line size */
/*
* way_incr is the address offset for accessing the next way
* in memory mapped cache array ops.
*/
unsigned int way_incr;
unsigned int entry_shift;
unsigned int entry_mask;
/*
* Compute a mask which selects the address bits which overlap between
* 1. those used to select the cache set during indexing
* 2. those in the physical page number.
*/
unsigned int alias_mask;
unsigned int n_aliases; /* Number of aliases */
unsigned long flags;
};